E-DWT-H
Electronic Deadweight Tester
Operation and Maintenance Manual© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUALW Warning•High pressure liquids and gases are potentially hazardous. Energy stored
in these liquids and gases can be released unexpectedly and with extreme
force. High pressure systems should be assembled and operated only by
personnel who have been instructed in proper safety practices.

•

This instrument is not to be operated in any other manner than thatspecified by the manufacturer.

© 2009 DH Instruments, a Fluke Company

All rights reserved.

Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any
form or by any means, electronic or mechanical, for any purpose, without the express written permission of DH Instruments, a
Fluke Company 4765 East Beautiful Lane, Phoenix AZ 85044-5318, USA.
DH Instruments makes sincere efforts to ensure accuracy and quality of its’ published materials; however, no warranty, expressedor implied, is provided. DH Instruments disclaims any responsibility or liability for any direct or indirect damages resulting from theuse of the information in this manual or products described in it. Mention of any product or brand does not constitute an
endorsement by DH Instruments of that product or brand. This manual was originally composed in English and was subsequently
translated into other languages. The fidelity of the translation cannot be guaranteed. In case of conflict between the English version
and other language versions, the English version predominates.
Products described in this manual are manufactured under international patents and one or more of the following U.S. patents:
5,142,483; 5,257,640; 5,331,838; 5,445,035. Other U.S. and international patents pending.
AutoRange, AutoZ, DH Instruments, DH, DHI, CalTool, COMPASS, E-DWT, RPM4-E-DWT, QDUT, Q-RPT and SDS are
trademarks, registered and otherwise, of DH Instruments, a Fluke Company.
Document No. 3389682
090318Printed in the USA© 2009 DH Instruments, a Fluke Company

TABLE OF CONTENTS

Table Of Contents
Table Of Contents ....................................................................I
Tables .................................................................................... V
Figures .................................................................................. VI
About This Manual ................................................................ VII
1.

Introduction ...................................................................... 1
1.1
1.2

Product Overview ...................................................................................................................................1
Specifications .........................................................................................................................................2
1.2.1
1.2.2
1.2.3
1.2.3.1
1.2.3.2

1.3

Views and Schematics ...........................................................................................................................5
1.3.1
1.3.1.1
1.3.1.2
1.3.1.3
1.3.2
1.3.2.1
1.3.2.2
1.3.3
1.3.4
1.3.5
1.3.5.1
1.3.5.2

2.

E-DWT Views.................................................................................................................................................5
Front View, Single Q-RPT E-DWT .............................................................................................................5
Front View, Dual Q-RPT E-DWT................................................................................................................6
Rear View...................................................................................................................................................7
RPM4-E-DWT Reference Pressure Monitor Views ....................................................................................7
Front Panel .................................................................................................................................................7
Rear Panel .................................................................................................................................................8
Battery/Charger Pack Views........................................................................................................................8
E-DWT-H Dimensions...................................................................................................................................9
E-DWT-H Hydraulic Schematic ...................................................................................................................9Single Q-RPT E-DWT-H Schematic...........................................................................................................9
Dual Q-RPT E-DWT-H Schematic ...........................................................................................................10

Installation ..................................................................... 11
2.1

Unpacking and Inspection...................................................................................................................11
2.1.1
2.1.2

2.2
2.3

2.4

Preparing for Operation .............................................................................................................................12
Filling E-DWT-H with Calibration Fluid and Purging Air..............................................................................12
Setting Up AutoTest Files..........................................................................................................................13

Operational Check................................................................................................................................13
2.4.1
2.4.1.1
2.4.1.2
2.4.2

2.5
2.6

Removing from Packaging ........................................................................................................................11
Inspecting Contents ...................................................................................................................................11

Site Requirements................................................................................................................................11
Setup .....................................................................................................................................................12
2.3.1
2.3.2
2.3.3

3.

General Specifications.................................................................................................................................2
Battery and Charger Pack ...........................................................................................................................3
Pressure Measurement Specifications ......................................................................................................3
Reference Pressure Transducers (RPT)....................................................................................................3
On-Board Barometer ..................................................................................................................................4

RPM4-E-DWT Pressure Measurement......................................................................................................13
Single Q-RPT Pressure Measurement.....................................................................................................13
Dual Q-RPT Pressure Measurement .......................................................................................................13
E-DWT Pressure Generation and Control ................................................................................................14

Short Term Storage ..............................................................................................................................15
Long Term Storage, Preparation for Shipping...................................................................................16

Operation ........................................................................ 17
3.1

General Operating Principles ..............................................................................................................17
3.1.1
3.1.2
3.1.3
3.1.4

Multiple Ranges (HI and LO Q-RPT, AutoRange) ....................................................................................17
Pressure Ready/Not Ready .......................................................................................................................18
Automated Test And Calibration Sequences ..........................................................................................18
Typical Operating Sequence To Run A Test............................................................................................18

Page I© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

3.2

Test Port Connection ...........................................................................................................................19
3.2.1

3.3
3.4
3.5

3.5.1
3.5.2
3.5.3

3.6

Summary .....................................................................................................................................................30[RANGE] ......................................................................................................................................................31[UNIT]...........................................................................................................................................................32[MODE] ........................................................................................................................................................33[AUTORANGE] ............................................................................................................................................33[LEAK CK] ...................................................................................................................................................35[DIsplay] ......................................................................................................................................................36
Avg (Average) ..........................................................................................................................................37
Rate ..........................................................................................................................................................38
DEV (Deviation)........................................................................................................................................39
RPT ..........................................................................................................................................................40
HI/LO ........................................................................................................................................................41
Freeze ......................................................................................................................................................41
Clean ........................................................................................................................................................42[HEAD] .........................................................................................................................................................42[SDS]............................................................................................................................................................44[AUTOZ].......................................................................................................................................................44[ENT/AutoTest] (Run AutoTest) ................................................................................................................45
AutoTest Initialization ...............................................................................................................................46
Test Execution..........................................................................................................................................47[SETUP] .................................................................................................................................................49
3.8.1
3.8.1.1
3.8.1.2
3.8.2
3.8.3
3.8.4
3.8.4.1
3.8.5
3.8.5.1
3.8.5.2

3.9

MAIN RUN Screen ......................................................................................................................................27
Function / Data Keypad Layout and Protocol..........................................................................................29
Optional Remote [ENT] (ENTER) Footswitch ..........................................................................................29
Sounds ........................................................................................................................................................30

RPM4-E-DWT Direct Function Keys....................................................................................................30
3.7.1
3.7.2
3.7.3
3.7.4
3.7.5
3.7.6
3.7.7
3.7.7.1
3.7.7.2
3.7.7.3
3.7.7.4
3.7.7.5
3.7.7.6
3.7.7.7
3.7.8
3.7.9
3.7.103.7.11
3.7.11.1
3.7.11.2

3.8

Filling And Priming, Reservoir Pump .......................................................................................................25
Pressure Generation And Rough Adjustment, Variable Volume...........................................................26
Pressure Fine Adjustment, Fine Adjust Valve .........................................................................................27

RPM4-E-DWT User Interface................................................................................................................27
3.6.1
3.6.2
3.6.3
3.6.4

3.7

RPM4-E-DWT ATM Port(s) .........................................................................................................................20

Battery/Charger Pack (Optional Accessory) ......................................................................................20
Selecting the Hi or Lo Q-RPT (Dual Q-RPT Models Only) .....................................................................21
Pressure Generation And Adjustment................................................................................................24<1RANGE> ..................................................................................................................................................49
Saving An AutoRange Range ..................................................................................................................49
Deleting AutoRange Ranges....................................................................................................................50<2RES> (Resolution) ..................................................................................................................................50<3stab> (Stability) ......................................................................................................................................51<4UL> (Upper Limit) ...................................................................................................................................52
Over Pressure Function ...........................................................................................................................53<5ATEST>....................................................................................................................................................53
DATA ........................................................................................................................................................53
FILE ..........................................................................................................................................................55[SPECIAL] .............................................................................................................................................56
3.9.1
3.9.2
3.9.2.1
3.9.2.2
3.9.2.3
3.9.2.4
3.9.3
3.9.4
3.9.5
3.9.5.1
3.9.5.2
3.9.5.3
3.9.5.4
3.9.5.5
3.9.6
3.9.7
3.9.7.1
3.9.7.2
3.9.7.3
3.9.7.4
3.9.7.5
3.9.8
3.9.9
3.9.9.1
3.9.9.2<1AUTOZ> ...................................................................................................................................................57<2REMOTE> ................................................................................................................................................59<1COM1, 2COM2> ..................................................................................................................................59<3IEEE-488> ............................................................................................................................................60<4FORMAT> ............................................................................................................................................60<5RS232 SELF-TEST>............................................................................................................................60<3HEAD> .....................................................................................................................................................61<4SDS> ........................................................................................................................................................61<5prefs>.......................................................................................................................................................61<1SCRSVR> ............................................................................................................................................61<2SOUND> ..............................................................................................................................................62<3time> ....................................................................................................................................................62<4id> ........................................................................................................................................................63<5LEVEL> (Security)................................................................................................................................63<6PUNIT>.....................................................................................................................................................66<7INTERN> ..................................................................................................................................................67<1BARO> .................................................................................................................................................67<2READRT> ............................................................................................................................................68<3RPT2X>................................................................................................................................................68<4LO VNT> ..............................................................................................................................................69<5log> ......................................................................................................................................................69<8CAL> ........................................................................................................................................................69<9RESET> ...................................................................................................................................................69<1SETS> ..................................................................................................................................................70<2 Units> ..................................................................................................................................................70© 2009 DH Instruments, a Fluke Company

Page IITABLE OF CONTENTS

3.9.9.3
3.9.9.4
3.9.9.5

4.

Remote Operation ............................................................ 73
4.1
4.2

Overview ...............................................................................................................................................73
Interfacing .............................................................................................................................................73
4.2.1
4.2.1.1
4.2.1.2

4.3

4.4

RS232 Interface...........................................................................................................................................73
COM1 .......................................................................................................................................................73
COM2 .......................................................................................................................................................74

Programming Formats .........................................................................................................................74
4.3.1
4.3.2
4.3.2.1

Program Message Format .........................................................................................................................74
Error Queue.................................................................................................................................................75
Using Query Type Commands.............................................................................................................75

Commands............................................................................................................................................76
4.4.1
4.4.2
4.4.3
4.4.4

5.

<3ATEST>................................................................................................................................................71<4 Cal> .....................................................................................................................................................71<5 All> ......................................................................................................................................................71

Programming Messages ............................................................................................................................76
ERROR Messages ......................................................................................................................................77
Program Message Description Overview.................................................................................................78
Program Message Descriptions................................................................................................................79

Maintenance,
5.1
5.2

Overview ...............................................................................................................................................97
RPM4-E-DWT Maintenance..................................................................................................................97
5.2.1
5.2.2

5.3

AutoZero of Q-RPTS ..................................................................................................................................97
Adjustment of the On-Board Barometer ..................................................................................................98

RPM4-E-DWT Q-RPT Calibration.........................................................................................................98
5.3.1
5.3.1.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
5.3.7

5.4

Adjustments a n d C a l i b r a t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7

Principle ......................................................................................................................................................98
PA and PM Coefficients ...........................................................................................................................99
Equipment Required ..................................................................................................................................99
Set-Up and Preparation ...........................................................................................................................100
Recommended Calibration Point Sequence ..........................................................................................100
RPT Calibration Using CalTool for Q-RPTS Software ...........................................................................101
Editing and Viewing Q-RPT Calibration Information ............................................................................101
Q-RPT Adjustment Without CalTool for Q-RPTS Software...................................................................102

E-DWT Maintenance ...........................................................................................................................103
5.4.1
5.4.2
5.4.3
5.4.4
5.4.4.1
5.4.4.2
5.4.4.3
5.4.4.4
5.4.4.5
5.4.4.6
5.4.5

E-DWT Overhaul .......................................................................................................................................103
Reloading Embedded Software into RPM4-E-DWT Flash Memory......................................................104
Filling E-DWT-H with Calibration Fluid and Purging Air Using the Optional Fill Kit .................................104
RPM4-E-DWT Subassembly Description and Location ........................................................................105
Micro Board ............................................................................................................................................105
Driver Board ...........................................................................................................................................105
On-Board Barometer ..............................................................................................................................106
Q-RPT Module .......................................................................................................................................106
Display....................................................................................................................................................106
Cooling Fan ............................................................................................................................................106
Hydraulic Schematic of Q-RPT Module ..................................................................................................106

6.

Troubleshooting .............................................................107

7.

Appendix .......................................................................111
7.1

Unit Conversion..................................................................................................................................111
7.1.1

8.

Warranty ........................................................................113
8.1

9.

Pressure ....................................................................................................................................................111

Overview .............................................................................................................................................113

Glossary ........................................................................115

Page III© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

Notes© 2009 DH Instruments, a Fluke Company

Page IVTABLES & FIGURES

TablesTable 1. Reference Pressure Transducer (Q-RPT) Module Designations and Ranges.............................. 3
Table 2. E-DWT-H packing list................................................................................................................... 11
Table 3. Settings and what they are specific to (range, measurement mode, Q-RPT, system)................ 18
Table 4. Summary of RPM4-E-DWT function key operation ..................................................................... 31
Table 5. Settings made by AutoRange ...................................................................................................... 34
Table 6. Security levels .............................................................................................................................. 64
Table 7. UNIT function - available units of measure.................................................................................. 66
Table 8. READRT – display update rates .................................................................................................. 68
Table 9. Reset – Sets................................................................................................................................. 70
Table 10. Reset – Cal ................................................................................................................................ 71
Table 11. Reset – All.................................................................................................................................. 71
Table 12. COM1 pin designations and connections .................................................................................. 73
Table 13. COM2 DB-9F pin designations .................................................................................................. 74
Table 14. Program message list ................................................................................................................ 76
Table 15. Error #s and descriptions ........................................................................................................... 77
Table 16. Calibration point sequence for E-DWT-H RPM4-E-DWT Q-RPTs .......................................... 101
Table 17. Troubleshooting guide ............................................................................................................. 107
Table 18. Pressure unit of measure conversion coefficients ................................................................... 111
Table 19. DHI Authorized Service Providers ........................................................................................... 113

Page V© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

FiguresFigure 1. E-DWT-H with single Q-RPT, front view....................................................................................... 5
Figure 2. E-DWT-H with dual Q-RPT, front view ......................................................................................... 6
Figure 3. E-DWT-H rear view....................................................................................................................... 7
Figure 4. RPM4-E-DWT reference pressure monitor front view .................................................................. 7
Figure 5. RPM4-E-DWT reference pressure monitor rear view................................................................... 8
Figure 6. Battery/charger pack front and rear .............................................................................................. 8
Figure 7. E-DWT-H dimensions ................................................................................................................... 9
Figure 8. E-DWT-H with single Q-RPT hydraulic schematic ....................................................................... 9
Figure 9. E-DWT-H with dual Q-RPTs hydraulic schematic ...................................................................... 10
Figure 10. Battery pack/charger................................................................................................................. 21
Figure 11. E-DWT-H with dual Q-RPT, front view ..................................................................................... 23
Figure 12. E-DWT-H with dual Q-RPTs hydraulic schematic .................................................................... 24
Figure 13. MAIN RUN screen display fields............................................................................................... 28
Figure 14. Keypad layout ........................................................................................................................... 29
Figure 15. RPM4-E-DWT internal view.................................................................................................... 105
Figure 16. Hydraulic schematic RPM4-E-DWT Q-RPT Module ............................................................... 106© 2009 DH Instruments, a Fluke Company

Page VIABOUT THIS MANUAL

About This ManualThis manual is intended to provide the user with the basic information necessary to operate an E-DWT-H
electronic deadweight tester. It also includes a great deal of additional information provided to allow you
to optimize the use of the instrument and take full advantage of its many features and functions.
Before using the manual, take a moment to familiarize yourself with the Table of Contents structure: Sections
1.1, 2 and 3 provide orientation, start up and operation information. Section 4 is for remote communication
with the RPM4-E-DWT from an external computer. Section 5 provides maintenance and calibration
information. Section 6 is a quick troubleshooting guide. Use it to troubleshoot unexpected E-DWT-H behavior
based on the symptom of that behavior.

Note
For those of you who “don’t read manuals”, go directly to Section 2.3 to set up
your E-DWT-H and then go to Section 3.1.4 for a typical test procedure. This will
get you up and running quickly with a minimal risk of causing damage to yourself
or your new instrument. THEN… when you have questions or start to wonder
about all the great features you might be missing, get into the manual!

Manual Conventions
W Caution“Caution” is used in throughout the manual to identify conditions or actions that
could cause harm to the E-DWT-H or to the devices that are connected to the
E-DWT-H.

W Warning“Warning” is used in throughout the manual to identify actions that could pose ahazard to the user of the E-DWT-H.

Note“Note” is used throughout the manual to identify operating and applications advice
and additional explanations.
[ ] indicates direct function keys (e.g., [RANGE]).
< > indicates RPM4-E-DWT screen displays (e.g., <1yes>).

Page VII© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

Notes© 2009 DH Instruments, a Fluke Company

Page VIII

1. INTRODUCTION

1.

Introduction

1.1

Product Overview

The E-DWT-H electronic deadweight tester is to generate, set and measure pressure as required for avariety of pressure calibration and testing applications. The E-DWT-H is used in the lab or instrument
shop or can be taken into the field for performing in-situ calibrations and tests. This hydraulic pressure
calibration system combines a high performance electronic reference pressure monitor and manuallyoperated pressure generation and control hardware in a single, compact and rugged package. E-DWT-H
offers the ease of use and precision of continuous, real time electronic pressure measurement with thesimple and direct pressure control of high quality manual pressure hardware. E-DWT is named“electronic deadweight tester” because it is intended as a lightweight and easy to use, modern alternative
to conventional piston-cylinder and weight based deadweight testers.
The E-DWT’s electronic reference pressure monitor is a special version of DHI’s RPM4, designated
RPM4-E-DWT. RPM4-E-DWT can be configured with one or two high precision quartz reference pressuretransducers (Q-RPTs) with ranges from 7 MPa (1 000 psi) to 200 MPa (30 000 psi).
The RPM4-E-DWT is controlled locally by the operator using its front panel display, keypad and optionalfoot pedal or remotely by a computer using ASCII character command strings over its RS-232 interface.
RPM4-E-DWT uses an AutoRange feature to automatically select the most appropriate Q-RPT and to
optimize the E-DWT-H setup to cover the desired range of operation. When two Q-RPTs are included, ahalf-turn valve isolates and protects the Lo Q-RPT from high pressure when the Hi Q-RPT is in use.
Visual and audible indicators assist the operator in setting the shut off valve correctly.
The E-DWT-H includes the hardware necessary to fill and prime the system under test and generate andprecisely adjust pressure up to E-DWT’s 200 MPa (30 000 psi).
The E-DWT-H can be powered with an optional battery/charger pack for use in locations where AC power
is not readily available.

Page 1© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

1.2

Specifications
1.2.1

General Specifications

Power requirements:
To RPM4-E-DWT:
To 12 VDC AC to DC power
supply :Temperature
Operating:Storage:
Relative humidity
Operating:Storage (in case):
Weight:Dimensions
E-DWT footprint:
E-DWT height:
Pressure range:

Operating medium:

12 VDC, 1.2 A
100 to 240VAC, 50-60 Hz

10 to 40 °C- 20 to 70 °C

0 to 70%
0 to 100%
1 Q-RPT: 12 kg (26 lb) approx.
2 Q-RPT: 14 kg (30 lb) approx.

41.4 cm W x 37.1 cm D (16.3 in. x 14.6 in.)26.9 cm (10.6 in.), 33.6 cm (13.2 in.) to max variable volume handle stroke
Dependent on Q-RPT(s) included in RPM4-E-DWT.
200 MPa (30 000 psi) maximum with standard variable volume
100 MPa (15 000 psi) maximum with high volume (-HV) variable volume
Delivered filled with oil (di-ethyl-hexyl sebacate) or dry.
Standard E-DWT-H compatible with Sebacate, silicon oils, propylene glycol,
fully fluorinated liquids, partially fluorinated liquids, isopropyl alcohol, distilledwater.

Reservoir capacity:
Variable volume displacement:

Filling and priming pumpdisplacement:

300 cc (18 in.3)
3Standard vv: 3 cc (0.18 in. ) (200 MPa (30 000 psi) maximum)
3
High volume vv: 7 cc (43 in. ) (100 MPa (15 000 psi) maximum)

3

3.7 cc (0.23 in. )TEST pressure connection:

DH500 female.
Note: DH500 is a gland and collar type fitting for 6mm (1/4 in.) coned andleft hand threaded tubes equivalent to AE F250C, HIP HF4, etc.

Pressure Limits:

Maximum Working Pressure: Range of RPM4-E-DWT monitor’s Hi Q-RPT.
200 MPa (30 000 psi) with standard variable volume, 100 MPa (15 000 psi)with high volume variable volume.
Maximum priming pump pressure: 700 kPa (100 psi)
Maximum Working Pressure with Lo Q-RPT connected to TEST port:
Range of RPM4-E-DWT monitor’s Lo Q-RPT.
Lo Q-RPT pressure relief valve setting:
A40M Q-RPT: 44.7 MPa (6480 psi)
A20M Q-RPT: 22.3 MPa (3240 psi)
A14M Q-RPT: 15.7 MPa (2200 psi)
A10M Q-RPT: 10.8 MPa (1570 psi)
A7M Q-RPT: 7.6 MPa (1100 psi)

Communication ports:© 2009 DH Instruments, a Fluke Company

RS232 (COM1, COM2)

Page 2

1. INTRODUCTION

1.2.2

Battery and Charger Pack

The RPM4-E-DWT battery and charger pack is an optional accessory.
Power Requirements

100 to 240 VAC, 50/60 Hz, 15 W max consumption

Operating Temperature Range

10 to 40 °C

Storage Temperature Range- 20 to 70 °C

Weight8 cm H x 22.5 cm W x 20 cm D (3.1 in. x 8.9 in. x 7.9 in.)Battery Type

Nickel metal-hydrideBattery Voltage

12 VDC

Battery Capacity

Typical:Min:

Charge Time
Approx. Run Time, Full Charge

1.2.3

2 kg (4.4 lb)

Dimensions

9000 mAh
8200 mAh

Full charge from empty, 14 to 16 hours approx.
8 hours

Pressure Measurement Specifications
1.2.3.1

Reference Pressure Transducers (RPT)The E-DWT’s RPM4-E-DWT is configured with one (Hi) or two (Hi and Lo) quartz
reference pressure transducer (Q-RPT) modules to measure pressure (see Table 1).
The Lo Q-RPT cannot be greater than A40M.
The Q-RPTs are intrinsically absolute, operating against a sealed vacuum
reference. Gauge pressure is defined by offsetting atmospheric pressure andapplying dynamic compensation for atmospheric changes using the on-board
barometer (see Section 3.9.1).
The complete E-DWT-H model definition includes the Q-RPTs included in its
RPM4-E-DWT. For example, an E-DWT-H with A200M and A20M Q-RPTs isdesignated E-DWT-H A200M/A20M. An E-DWT-H with a single A200M Q-RPT
is designated E-DWT-H A200M.
Table 1. Reference Pressure Transducer (Q-RPT) Module Designations and Ranges
SI
VERSION
Q-RPT
DESIGNATIONUS VERSIONMAXIMUM
RANGE
[kPa]
Gauge

MAXIMUM
RANGE
[psi]

A200M1200 000

30 000

A140M

1

140 000

20 000

A100M

1

Gauge

100 000

15 000A70M

170 000

10 000A40M

140 000

6 000

A20M1

20 000

3 000

A14M

1

14 000

2 000

A10M

1

10 000

1 500

7 000

1 000

A7M

1

Page 3© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

Warm Up Time
Normal Operating Temperature Range
Resolution

Precision

15 minute temperature stabilization recommended fromcold power up.
10 to 40 °C
Default: 0.01 % of active range.
User adjustable to 1 ppm of Q-RPT maximum or 10 ppm
of active AutoRange, whichever is larger.

1± 0.018% of reading or 0.0018% of Q-RPT span,
whichever is greater2

One year: ± 0.0075% of reading or 0.0008% of Q-RPT
span, whichever is greater

Predicted Stability

Two year: +/- 0.015% of reading or 0.0015% of Q-RPT
span, whichever is greater3

Measurement Uncertainty

1.
2.

3.

One year: ± 0.02% of reading or 0.002% of Q-RPT span,
whichever is greater
Two year: ± 0.025% of reading or 0.0025% of Q-RPT
span, whichever is greater

Combined linearity, hysteresis, and repeatability.
Predicted Q-RPT measurement stability limit (k=2) assuming regular use of AutoZero function andshort term stability between rezeroing. As stability can only be predicted and varies from Q-RPT to
Q-RPT, stability for a specific Q-RPT should be established from experience.
Maximum deviation of the Q-RPT indication from the true value of applied pressure including
precision, predicted stability with rezeroing, temperature effect from 10 to 40 ºC and calibration
uncertainty (assumes calibration reference uncertainty of ±0.005% of reading, k=2), combined andexpanded (k=2) following the ISO “Guide to the Expression of Uncertainty in Measurement.”

1.2.3.2

On-Board Barometer

The measurement uncertainty of the on-board barometer is not significant to
E-DWT-H measurement uncertainty. The barometer is used only to measuresmall, short term changes in atmospheric pressure to provide dynamic
compensation of the Q-RPT’s atmospheric pressure offset in gauge pressure
measurement mode (see Section 3.9.1)
Sensor Technology:
Warm Up Time:
Resolution:© 2009 DH Instruments, a Fluke Company

Page 4Micro-machined siliconNone required
0.1 Pa (0.000015 psi)

1. INTRODUCTION

1.3

Views and Schematics
1.3.1

E-DWT Views
1.3.1.1

Front View, Single Q-RPT E-DWTA TEST1 port (DH500F)
B Reservoir cap
C Priming pump
D Reservoir cap vent valve
E Reference pressure monitor (RPM4-E-DWT)F Test shut off valve and fine pressureadjustment

G Reservoir shut off valve
H Variable volume (screw press)
I Variable volume piston position indicator

Figure 1. E-DWT-H with single Q-RPT, front view

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

1.3.1.2

Front View, Dual Q-RPT E-DWTA TEST1 port (DH500F)
B Reservoir cap
C Priming pump
D Reservoir cap vent valve
E Reference pressure monitor (RPM4-E-DWT)F Test shut off valve and fine pressure adjustment
G ‘Lo Q-RPT shut off’ valve position prompt LED

H Lo Q-RPT shut off valve
I ‘Lo Q-RPT active’ valve position prompt LED
J ‘Lo Q-RPT active’ caution indicator
K Reservoir shut off valve
L Variable volume (screw press)
M Variable volume piston position indicator

Figure 2. E-DWT-H with dual Q-RPT, front view© 2009 DH Instruments, a Fluke Company

Page 6

1. INTRODUCTION

1.3.1.3

Rear View

A Reservoir cap vent valve
B Priming pump
C Reservoir cap
D TEST1 connection (DH500 F)

E Power connection (12 VDC)F Footswitch (remote [ENT]) connection(footswitch not included)

G TEST2 connection (DH500 F)

Figure 3. E-DWT-H rear view

1.3.2

RPM4-E-DWT Reference Pressure Monitor Views
1.3.2.1

Front Panel

A Pressure ready/not ready indicatorB 2 x 20 vacuum fluorescent display

C Remote activity indicator
D Cursor control key

E Multi-function keypad

Figure 4. RPM4-E-DWT reference pressure monitor front view
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E-DWT-H OPERATION AND MAINTENANCE MANUAL

1.3.2.2

Rear Panel

A 12VDC power supply connection
B Accessories connector (to E-DWT-HF TEST(+) pressure port, Lo Q-RPT
Low Q-RPT is optionalrear panel FOOTSWITCH and LEDs)

C COM2 connector
D COM1 connector
E Fan

G TEST(+) pressure port, Hi Q-RPTH ATM pressure port, Lo Q-RPTI ATM pressure port, Hi Q-RPTJ Product label (bottom of case)

Figure 5. RPM4-E-DWT reference pressure monitor rear view

1.3.3

Battery/Charger Pack Views

A Cooling fan
B 12VDC output connector (to E-DWT)
C IEC power connection
D ON/OFF switch (ON – battery connected to charger;

E Charge level indicator
F Charge level check switch
G Battery charging indicator (green –charging; green flashing – fully charged.

OFF - battery connected to 12 VDC output/E-DWT)

Figure 6. Battery/charger pack front and rear

© 2009 DH Instruments, a Fluke Company

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1. INTRODUCTION

1.3.4

E-DWT-H Dimensions

Figure 7. E-DWT-H dimensions

1.3.5

E-DWT-H Hydraulic Schematic
1.3.5.1

Single Q-RPT E-DWT-H Schematic

A Reservoir vent valve
B Priming pump
C Reservoir
D Hi Q-RPT (ref pressure transducer)

E TEST1 port (top)F TEST2 port (rear)
G Test shut off and fine adjustment valve
H Reservoir shut off valve
I Variable volume (screw press)

Figure 8. E-DWT-H with single Q-RPT hydraulic schematic
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E-DWT-H OPERATION AND MAINTENANCE MANUAL

1.3.5.2

Dual Q-RPT E-DWT-H Schematic

A Reservoir vent valve
B Priming pump
C Reservoir
D Lo Q-RPT pressure relief valve
E Lo Q-RPT (ref pressure transducer)
F Hi Q-RPT (ref pressure transducer)

G TEST port1 (top)H TEST port 2 (rear)
I Test shut off and fine adjustment valve
J Lo Q-RPT shut off valve
K Reservoir shut off valve
L Variable volume (screw press)

Figure 9. E-DWT-H with dual Q-RPTs hydraulic schematic© 2009 DH Instruments, a Fluke Company

Page 10

2. INSTALLATION

2.

Installation

2.1

Unpacking and Inspection
2.1.1

Removing from Packaging

E-DWT complete with accessories is delivered in a corrugated container with suspension
packaging.
Remove the E-DWT-H and its accessories from the shipping container and remove eachelement from its protective plastic bag.

2.1.2

Inspecting Contents

Check that all items are present and have no visible damage. If damage is noted, report it toyour Receiving Department for appropriate action.
A new E-DWT-H includes all items listed in Table 2.
Table 2. E-DWT-H packing list

2.2

DESCRIPTIONPART NO.

E-DWT-H electronic deadweight tester

3390864ACCESSORIES:

3389701(3389712 CE)

1 ea.

Power cord (7.5 ft)

3133781(3153005 CE)

1 ea.

12 VDC power supply pack33356104 ea.

Handle, variable volume

3329907

2 ea.

Collar, SS, DH500

3068607

1 ea.

E-DWT-H Operation and Maintenance Manual

3389682

1 ea.

Calibration Report

3152121

1 ea.

General Accessories Disk

3139043

Site Requirements

Install E-DWT-H on a flat, stable surface at a convenient height. If using the battery/charger pack,consider its placement.
When used with a battery/charger pack, E-DWT-H requires no external support utilities. If not using thebattery, an electrical power source of 100 to 240VAC, 50-60 Hz is required.

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

2.3

Setup
2.3.1

Preparing for Operation

To prepare E-DWT-H for check out and operation:
Remove the protective plastic sheet from the RPM4-E-DWT front panel display.
Familiarize yourself briefly with the E-DWT-H front and real panels and controls (seeSection 1.3.1).
Connect the 12 VDC power supply pack to a source of 100 to 240V, 50-60 Hz AC power
and to the 12 VDC connection on the rear of the E-DWT; or, use the optional
battery/charger pack and cable, after battery has been charged (see Section 3.3).
Connecting power causes the RPM4-E-DWT to power up.
Observe the front panel display as the RPM4-E-DWT initializes, error checks and goes tothe MAIN RUN screen (see Section 3.6.1). If the RPM4-E-DWT fails to reach the main
run screen, service is required. Record the sequence of operations and displays
observed and contact a DHI Authorized Service Provider (see Section 8).
If the E-DWT-H has dual Q-RPTs, check that one of the two green Valve Status LEDs on
the front of the E-DWT-H is lit. If neither of the green LEDs lights, check that the 12 pin
circular connector on the rear panel of the RPM4-E-DWT itself is properly connected to
the J1 ACC. connector.
Install the four variable volume handles into the variable volume hub on the front of the
E-DWT-H.
Leave the stainless steel plug in the top and rear TEST1 and TEST2 ports. Check thatthe glands holding the plugs are tight.
Check/Set Security Level
RPM4-E-DWT has a security system based on user levels. By default, the security
system is set to “low” (low security includes access restriction to internal calibration
coefficients) and there is no password required to change the security level. See Section
3.9.5.5 for information on the security level system. As part of the RPM4-E-DWT startup,
determine the security level that is appropriate for the RPM4-E-DWT and set a password
if desired.

Note
RPM4-E-DWT is delivered with the security level set to “low” to avoid
inadvertent altering of critical internal settings but with access to changing
security levels unrestricted. It is recommended that the low security levelbe maintained at all times and password protection be implemented if
control over setting of security levels is desired.

2.3.2

Filling E-DWT-H with Calibration Fluid and Purging Air

A standard E-DWT-H is delivered already filled and primed with Sebacate calibration fluid
and should not need additional filling and priming before use.
If your E-DWT-H was received not filled with fluid, it needs to be filled and primed with thefluid with which it will be operated. See Section 5.4.3 for instruction on filling and priming an
empty E-DWT-H with calibration fluids.

© 2009 DH Instruments, a Fluke Company

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2. INSTALLATION

2.3.3

Setting Up AutoTest Files

E-DWT-H’s RPM4-E-DWT supports automated test/calibration sequences.
AutoTest
sequence parameters for testing specific DUTs can be stored in AutoTest files and recalled torun a test. Consider setting up File AutoTests for frequently tested DUTs as part of the set upprocess (see Section 3.1.3).

2.4

Operational Check
2.4.1

RPM4-E-DWT Pressure Measurement
2.4.1.1

Single Q-RPT Pressure Measurement

Refer Figure 1 and Figure 8 when following this procedure.
Let the RPM4-E-DWT warm up with power ON for approximately 15 minutes.
Open the reservoir vent valve (on the reservoir lid) by turning it CCW.
Open the reservoir shut off valve by turning it CCW.
If desired, change the pressure unit of measure using [UNIT] (see Section
3.7.3).
The value indicated should be near zero. Press [AutoZ]. This runs AutoZ tozero the Q-RPT reading (see Section 3.7.10). Upon return to the main run
screen, observe that the indication of measured pressure has zeroed. If thedisplay fails to zero properly, the RPM4-E-DWT may need repair.

Note
It is normal for RPM4-E-DWT to indicate a value other than zero
when vented when gauge mode is first entered or ranges arechanged, especially if AutoZ is OFF. A value other than zero
may also be indicated, even after running AutoZero if a headcorrection is being applied (see Section 3.7.8).

2.4.1.2

Dual Q-RPT Pressure Measurement

Refer Figure 2 and Figure 9 when following this procedure.
Check that one of the two green Valve Status LEDs on the front panel of the
E-DWT-H is lit (the red LED should NOT be ON). If neither of the green
LEDs on the front panel lights, check that the 12 pin circular connector at therear of the RPM4-E-DWT itself is properly connected to the J1 ACC.
connector.
Let the RPM4-E-DWT warm up with power ON for approximately 15 minutes.
Open the reservoir vent valve (on reservoir lid) by turning it CCW.
Open the reservoir shut off valve by turning it CCW.
Put the lo Q-RPT shut off valve into the Lo Q-RPT Active position (turn fully
CCW) . This opens the Lo and Hi Q-RPTs to the TEST port.
Use [RANGE] (see Section 3.7.2) to select the Lo Q-RPT. If desired, change
the pressure unit of measure using [UNIT] (see Section 3.7.3).

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

The value indicated should be near zero. Press [AutoZ]. This runs AutoZ tozero the Q-RPT reading (see Section 3.7.10). Upon return to the main run
screen, observe that the indication of measured pressure has zeroed. If thedisplay fails to zero properly, the RPM4-E-DWT may need repair.
Use [RANGE] to select the Hi Q-RPT (see Section 3.7.2) and repeat thezeroing process.
If the display fails to zero properly, the RPM4-E-DWT may need repair.

Note
It is normal for RPM4-E-DWT to indicate a value other than zero
when vented when gauge mode is first entered or ranges arechanged, especially if AutoZ is OFF. A value other than zero
may also be indicated if a head correction is being applied (seeSection 3.7.8).

2.4.2

E-DWT Pressure Generation and Control

Perform the RPM4-E-DWT pressure measurement operational check (see Section 2.4.1)
before the pressure generation and control check.
Refer to Figure 11 and Figure 12 when following this procedure.
Check that there is calibration fluid in the E-DWT-H reservoir and that the E-DWT-H has
been filled and primed with calibration fluid. If the E-DWT-H was delivered for operation
with Sebacate fluid, it was delivered already filled and purged with oil in the reservoir. If
delivered for use with another fluid, fill and purge the E-DWT-H before the pressure
generation and control check following the instructions in Section 5.4.3.
Open the reservoir vent valve by rotating it CCW.
Open the reservoir shut off valve.
Set the variable volume to start position. Rotate variable volume handles CCW until redof variable volume piston position indicator (top surface of E-DWT-H) is fully retracted.
If the E-DWT-H has dual Q-RPTs, put the Lo Q-RPT shut off valve into the Lo Q-RPT Active
position (rotate valve fully CCW). This opens the Lo and Hi Q-RPTs to the E-DWT-H
pressure generation and control system.
If desired, change the pressure unit of measure using [UNIT] (see Section 3.7.3).

Note
With the Lo Q-RPT connected, never exceed the maximum pressure of the
Lo Q-RPT or it could be permanently damaged. If the red CAUTION
indicator flashes and/or an audible alarm sounds, immediately reducepressure to avoid damaging the Q-RPT.
Check that a stainless steel plug is installed in the E-DWT-H top TEST1 and rear TEST2
ports, and that the gland holding the plug is tight.
Slowly lift the reservoir priming pump knob and then push it down at moderate speed with
firm, even pressure. With a brief delay, the pressure indicated by the RPM4-E-DWT
should rise. If the pressure does not rise above 100 kPa (15 psi), it is likely there is air in
the E-DWT-H hydraulic circuit, most likely in the low pressure PFA tubing between thereservoir and the rest of the system (see Section 5.4.3). It is normal for the pressure todrop when the reservoir pump is released since the pump is vented by releasing it.
Close the reservoir shut off valve and check that the test shut off valve is open.

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2. INSTALLATION

Slowly rotate the variable volume CW and observe the RPM4-E-DWT display. The
indicated pressure should increase. Slowly increase the pressure to the maximum
pressure of the Lo Q-RPT and stop. The pressure should decrease, more and more
slowly, and eventually stabilize. If the pressure decreases indefinitely (more than 5
minutes), there is probably a leak in the E-DWT-H and it may require service.
Rotate the variable volume handle CCW to reduce pressure to about 700 kPa (100 psi)and open the reservoir shut off valve. If the E-DWT-H has a single Q-RPT, the pressure
generation and control check out is complete.
If the E-DWT-H has dual Q-RPTs, put the Lo Q-RPT shut off valve into the Lo Q-RPT Shut
Off position (valve rotated fully CW). This isolates the Lo Q-RPT from the E-DWT-H pressure
generation and control system.
Use [RANGE] (see Section 3.7.2) to select the Hi Q-RPT.

Note
If the red CAUTION indicator flashes and/or an audible alarm sounds at
any time, immediately reduce pressure to avoid damaging the E-DWT-H Lo
Q-RPT.
Close the reservoir shut off valve and check that the test shut off valve is open.
Slowly rotate the variable volume CW and observe the RPM4-E-DWT display. The
indicated pressure should increase. Slowly increase the pressure to the maximum
pressure of the Hi Q-RPT, stop and wait. The pressure should decrease, more and more
slowly and eventually stabilize. If the pressure decreases indefinitely (more than 5
minutes), there is probably a leak in the E-DWT-H and it may require service.
Rotate the variable volume handle CCW to reduce pressure to about 700 kPa (100 psi)and open the reservoir shut off valve.

2.5

Short Term Storage

The following is recommended for short term storage (not shipping or transport) of E-DWT-H:•

Open the reservoir shut off valve.

•

Disconnect power.

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

2.6

Long Term Storage, Preparation for Shipping

The following is recommended for long term storage and/or shipping of E-DWT-H:

Note
E-DWT-H is designed to be shipped with its reservoir full of calibration fluid. If the
instructions below are followed carefully, it is not necessary to empty the reservoir
prior to shipment.
•

IMPORTANT: Close the reservoir cover fully by rotating it CW until snug.

•

IMPORTANT: Close the reservoir shut off valve (on reservoir cover) by rotating it CW until snug.

•

IMPORTANT: Plug the TEST1 and TEST2 ports. Use the stainless steel plugs provided with the
E-DWT-H. Tighten the gland that holds the plug.

•

Close the test shut off valve by rotating it CW until snug.

•

Remove (by unscrewing) the four variable volume handles on the front of the E-DWT.

© 2009 DH Instruments, a Fluke Company

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3. OPERATION

3.

Operation

3.1

General Operating Principles
3.1.1

Multiple Ranges (HI and LO Q-RPT, AutoRange)

The E-DWT-H’s Reference Pressure Monitor (RPM4-E-DWT) may have one or two Quartz
Reference Pressure Transducers (Q-RPTs). The higher range Q-RPT is designated the Hi QRPT. The lower range Q-RPT is designated the Lo Q-RPT. Which Q-RPT is active isindicated continuously by characters in the upper right hand corner of the MAIN RUN screen
and most other screens (<Hi> for Hi Q-RPT, <Lo> for Lo Q-RPT).
Each RPM4-E-DWT Q-RPT has a default range which is its maximum range. Additional
ranges, lower than the Q-RPT’s maximum, may also be created using AutoRange and
AutoTest (see Sections 3.7.5, 3.1.3). Ranges created using AutoRange are temporary but
may be saved with all their settings for reactivation (see Section 3.8.1).
The ranges available on the RPM4-E-DWT are accessed using [RANGE] (see Section 3.7.2)
and/or created using [AutoRange] (see Section 3.7.5).
An RPM4-E-DWT range is identified by a range screen showing the Q-RPT used by therange, its current unit of measure and its full scale pressure. The range screen is:
1.

Q-RPT designator.

2.

Type of range. DF for the Q-RPT’s default (maximum) range; AR fora range created by AutoRange.

3.

Q-RPT position designator.

4.

Current pressure unit of measure.

5.

Full scale pressure, with <g> for gauge mode.

Active A70M
psi
10000gDF Hi

Most settings made in an RPM4-E-DWT, such as unit of measure, display resolution and stability
setting are specific to the range. Settings selected while one range is active apply to that range
and not to other ranges. The range specific settings are stored with the range and recalled
whenever the range is made active. This makes setting up ranges a convenient way to store andrecall frequently used operating configurations. See Table 3 for a listing of RPM4-E-DWT
adjustments and settings and whether they are range, Q-RPT or system specific.

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

Table 3. Settings and what they are specific to(range, measurement mode, Q-RPT, system)
SETTINGPURPOSESPECIFIC TOSECTION[Unit]

Set pressure unit of measure

Range

3.7.3

[Display]

Set bottom line display function

System

3.7.7[Head]

Set fluid head correction height, fluid, unit ofmeasureSystem

3.7.8

[SDS]

Not used in this RPM4 modelNot used

None[AutoZ]Run AutoZ

Q-RPT and measurement mode

3.7.10Resolution

Set pressure display resolution

Range

3.8.2

Stability

Set Ready/Not Ready stability test.

Range

3.8.3

Upper Limit

Set upper and lower pressure limit alarm

Range and measurement mode

3.8.4

AutoZ

AutoZ, ON/OFF, set and view values

Q-RPT and measurement mode

3.9.1

Screen Saver,Sound, Time,
ID, Level

Set system user preferences

System

3.9.5

CalVarious Q-RPT and barometer calibration
functions

Q-RPT or barometer

5.2.2

3.1.2

Pressure Ready/Not Ready

There is a Ready/Not Ready indicator LED on the RPM4-E-DWT front panel to the left of thedisplay. It is intended to provide the user with a clear and objective indication of when astable pressure has been achieved. Ready is indicated when the current stability (rate ofchange) of pressure is less than the stability limit. The stability limit is set automatically by
AutoRange or AutoTest (see Sections 3.7.5, 3.1.3). It can also be set by the user (seeSection 3.8.3). The Ready indication is often used when comparing the RPM4-E-DWT and atest device to indicate when a valid reading can be made.
The Ready/Not Ready LED indications are:<Green >Pressure Ready

The pressure stability is within the stability limit.

<Red>

Pressure Not Ready

The pressure stability is NOT within the stability limit.

The default stability criterion is 0.01% of full scale of the active range per second.

3.1.3

Automated Test And Calibration Sequences

The RPM4-E-DWT AutoTest function supports “Quick” and “File” automated calibration
sequences. These automatically AutoRange the RPM4-E-DWT, setting its resolution,
stability limit and upper limit based on the characteristics of the device under test. They also
prompt the user through the increments of the calibration sequence and log calibration data.
The AutoTest function should be used for most common calibration tasks, especiallycalibration of analog pressure gauges.

3.1.4

Typical Operating Sequence To Run A Test

The typical operating sequence to run a test is as follows:
AutoZero the RPM4-E-DWT:
Disconnect the E-DWT-H TEST port.
Close the reservoir shut off valve.
Press [AutoZ] on the RPM front panel (see Section 3.7.10).

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3. OPERATION

Connect the system under test/DUT to the E-DWT-H TEST port.
Use [HEAD] to enter the fluid head correction for the difference in height between the
E-DWT-H TEST port and the DUT reference level if significant (see Section 3.7.8).
Fill and prime the system under test/DUT (see Section 3.5.1):
Open the test system/DUT at the highest point possible.
Use the filling and priming pump to fill the test system.
Close the test system/DUT when all air has been purged.
Use [AutoRange] (see Section 3.7.5) or [AutoTest] (see Section 3.1.3) to set up the
RPM4-E-DWT for the specific test to be run.
Set zero gauge pressure to the DUT by opening the reservoir cap vent valve, thereservoir shut off valve and the TEST shut off valve. The RPM4-E-DWT indication may
not be zero if the DUT reference height is different from the E-DWT-H reference height
and/or if a head correction value is set (see Section 3.7.8).
Set the next pressure. Close the reservoir shut off valve. Check that the TEST shut off
valve is open. Use the variable volume and fine adjustment valve to set pressure asneeded (see Sections 3.5.2, 3.5.3).
When the DUT is stable, read the reference pressure applied from the RPM4-E-DWT.
After the last pressure, return to zero by opening the reservoir shut off valve. The
RPM4-E-DWT indication may not be zero if the DUT reference height is different from the
E-DWT-H reference height.

3.2

Test Port Connection

High pressure TEST ports are provided on the top and rear of the E-DWT.
The test port connection is a DH500 F. DH500 is a gland and collar type fitting for 1/4 in. (6 mm) coned
and left hand threaded tube. DH500 is equivalent to AE F250C, HIP HF4, etc.

W Caution•

USE THE CORRECT PRESSURE CONNECTORS: The E-DWT-H TEST port
fitting is a DH500 F (see Section 1.2.1). It is NOT a 1/8 in. NPT F. Never use
a fitting other than the corresponding male fitting in these connectors.
Damage to the connectors and dangerous failure under pressure could
result from using incorrect fittings.

•

DO NOT APPLY PRESSURE UNTIL YOU ARE FAMILIAR WITH OPERATION:
The E-DWT-H TEST ports can connect internally to both the RPM4-E-DWT’s
Hi and Lo (if present) Q-RPTs. In E-DWT-Hs with dual Q-RPTs, the LO
Q-RPT SHUT OFF valve on the front of the E-DWT-H isolates the lowpressure Q-RPT when the high pressure Q-RPT is in use. Do not applypressure to the E-DWT-H until you are familiar with its operation and know
how to protect the low pressure Q-RPT, if present, from overpressure (seeSection 3.4). FAILURE TO PROTECT THE LOW PRESSURE Q-RPT FROMOVERPRESSURE MAY DESTROY IT.
DAMAGE DUE TO Q-RPTOVERPRESSURE IS NOT COVERED BY THE PRODUCT WARRANTY.

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

3.2.1

RPM4-E-DWT ATM Port(s)The ATM port(s) on the RPM4-E-DWT Q-RPT module(s) are connected to the
RPM4-E-DWT’s internal barometer to assure that the RPM4-E-DWT gauge pressure
measurements are relative to ambient pressure. These ports should always be left
completely unobstructed and open to atmosphere.

W Caution
NEVER plug, obstruct or connect a supply pressure to the RPM4-E-DWT
Q-RPT module ATM ports. This may adversely affect operation and
AutoZeroing functions.

3.3

Battery/Charger Pack (Optional Accessory)

An optional 12 VDC battery/charger pack is available to supply power to the E-DWT’s reference pressure
monitor.
The battery/charger pack combines a battery and battery charger.
To Charge the Battery
To charge the battery, connect the battery/charger pack to a 100 to 240 V, 50/60 Hz power supply using
the power cable supplied and turn on the charger power switch. The green CHARGE indicator light goeson to indicate that battery charging is in progress. Allow 14 to 16 hours for the battery to charge fully.
When the battery charger power switch is in the ON position, the battery is connected to the charger, notthe 12VDC output. When the battery charger switch is in the OFF position, the CHARGE indicator lightgoes off, and 12VDC battery output is supplied to the 12VDC connection.
The battery may be charged while the battery/charge pack is connected to the RPM4-E-DWT.

W Caution
To preserve battery life, if run the battery down completely before recharging it anddo not charge more than 16 hours. Do not leave power connected to the battery
continuously.
To Use the Battery/Charger Pack to Supply the RPM4-E-DWT
After charging the battery, connect the 12VDC connection of the battery/charger pack to the 12VDC
connection on the E-DWT-H rear panel.
Turn the battery/charger pack power switch to OFF (when AC power is connected to the battery/charger
pack, the power switch must be OFF for 12VDC power to be output).
To Check the Battery Charge Level
To check the current charge level of the battery, press the BATTERY CHECK toggle switch on thebattery/charger pack front panel. Observe the BATTERY CHECK indicator lights. All three lights are lit
when battery is fully charged. If no light or one light is on, the battery should be recharged.

© 2009 DH Instruments, a Fluke Company

Page 20

3. OPERATIONA Cooling fan
B 12VDC output connector (to E-DWT)
C IEC power connection
D ON/OFF switch (ON – battery connected to charger;

E Charge level indicator
F Charge level check switch
G Battery charging indicator (green –charging; green flashing – fully charged.

OFF - battery connected to 12 VDC output/E-DWT)

Figure 10. Battery pack/charger

3.4

Selecting the Hi or Lo Q-RPT (Dual Q-RPT Models Only)
Note
This section applies only the E-DWT-H models with two Q-RPTs (see Section
1.2.3.1).

Selection of the active Q-RPT in the RPM4-E-DWT is made using the RPM4-E-DWT front panel’s[RANGE] key and E-DWT-H LO Q-RPT SHUT OFF valve.
When the Hi Q-RPT is active, the Lo Q-RPT must be isolated from the E-DWT’s pressure generation andcontrol system to avoid destroying it by overpressure.
The E-DWT’s Lo Q-RPT shut off valve and visual and audible indicators, assist the operator in performing
the correct operations to shut off and protect the Lo Q-RPT when the Hi Q-RPT is in use.
 OPERATION
See Figure 12 for the schematic of E-DWT-H with dual Q-RPTs.
Numerical references in this Section refer to Figure 11.
The Lo Q-RPT is connected to or shut off from the rest of the E-DWT-H by the Lo Q-RPT shut off valvethat is operated using the valve knob. The proper valve position for the Q-RPT selected is prompted by
the Valve Position LEDs (7, 9).
The Lo Q-RPT shut off valve (8) isolates and protects the Lo Q-RPT from the TEST port when it isclosed (knob fully CW) and opens the Lo Q-RPT to the TEST port when it is open (knob fully CCW).

Page 21© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUALThe Valve Position LEDs (7, 9) indicate the position in which the valve knob should be set based on thecurrent Q-RPT selection on the RPM4-E-DWT. If the Hi Q-RPT is selected, the LO Q-RPT SHUT OFF LED(7) is lit indicating that the valve knob should be turned fully CW to close the valve, protecting the Lo Q-RPTfrom high pressure. If the Lo Q-RPT is selected, the LO Q-RPT ACTIVE LED (9) is lit indicating that the valve
knob should be turned fully CCW to open the valve, connecting the Lo Q-RPT to the test pressure.

Note
The E-DWT-H Lo Q-RPT shut off valve (8) must always be in the closed position(knob fully CW) when operating at pressure greater than the maximum pressure of
the Lo Q-RPT.
The CAUTION LO Q-RPT ACTIVE LED (10) is used to indicate that the Lo Q-RPT is active and provide
an alert when the Lo Q-RPT is active but a Hi Q-RPT range is selected on the RPM4-E-DWT.
The CAUTION LO Q-RPT ACTIVE LED (10) is driven by the value of pressure currently measured by the
Lo Q-RPT , it is not driven by the valve position as there is no sensing of the valve position.
The CAUTION LO Q-RPT ACTIVE LED (10) has three possible conditions:•

LED is OFF: The Lo Q-RPT is NOT active. The Lo Q-RPT is considered active when it measures apressure greater than about 100 psig (700 kPa).

•

LED ON continuously: The Lo Q-RPT IS active (exposed to pressure greater than 100 psi) and the
Lo Q-RPT is selected on the RPM4-E-DWT. The LED is lit as a reminder that the Lo Q-RPT is active
and pressure over its maximum working pressure (maximum depends on Lo Q-RPT range) should
not be applied.

•

LED is flashing ON/OFF accompanied by high frequency beeps and <!!LO Q-RPT ACTIVE!!>
displayed by RPM4-E-DWT: Lo Q-RPT IS active and the Hi Q-RPT is selected on RPM4-E-DWT.
The Lo Q-RPT should NOT be exposed to pressure when the Hi Q-RPT is selected. Exposing the Lo
Q-RPT to pressures for which the Hi Q-RPT is normally used, will overpressure and damage the Lo
Q-RPT Vent pressure from the RPM4-E-DWT and shut off the Lo Q-RPT with the Lo Q-RPT shut off
valve before continuing to use the Hi Q-RPT.

Note
If the Hi Q-RPT is selected with the Lo Q-RPT active, RPM4-E-DWT goes into an
alarm condition to avoid accidental overpressure of the Lo Q-RPT while using a Hi
Q-RPT. The pressure on the Lo Q-RPT must be reduced to less than 100 psig (700kPa) so that the CAUTION LO Q-RPT ACTIVE LED is OFF before shutting the Lo
Q-RPT shut off valve and selecting the Hi Q-RPT.
The E-DWT-H Lo Q-RPT pressure relief valve (Figure 12, Ref 4) is set to open at approximately 110% of
the RPM4-E-DWT Lo Q-RPT maximum range. When the pressure applied to the Lo Q-RPT reaches therelief valve setting, the pressure relief valve will open exhausting oil to the reservoir and reduce pressure.
Prior to opening the pressure relief valve, the RPM4-E-DWT will have gone into an overpressure
condition (see Section 3.8.4.1). If an overpressure condition occurs, reduce pressure as soon as
possible. The pressure relief valve will reseat automatically and close when pressure is reduced.

Note
Do NOT overpressure the Lo Q-RPT. The Lo Q-RPT may be damaged beyond
repair by pressure greater than its maximum working pressure. Q-RPT damage
from overpressure is logged in user and factory maintenance pages and is notcovered by the product warranty. The E-DWT-H pressure relief valve should only
be considered a last resort means of protecting the Lo Q-RPT and it does notguarantee that the Lo Q-RPT will not be damaged by overpressure. Following
proper operating procedures, the Lo Q-RPT should never be over pressured.

© 2009 DH Instruments, a Fluke Company

Page 22

3. OPERATIONA TEST port (DH500F)
B Reservoir cap vent valve
C Priming pump
D Reservoir cap
E Reference pressure monitor (RPM4-E-DWT)F Test shut off valve and fine pressure adjustment
G ‘Lo Q-RPT shut off’ valve position prompt LED

H Lo Q-RPT shut off valve
I ‘Lo Q-RPT active’ valve position prompt LED
J ‘Lo Q-RPT active’ caution indicator
K Reservoir shut off valve
L Variable volume (screw press)
M Variable volume piston position indicator

Note: Items 7 – 10 are present only in dual Q-RPT E-DWT-H models.
Figure 11. E-DWT-H with dual Q-RPT, front view

Page 23© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

A Reservoir vent valve
B Priming pump
C Reservoir
D Lo Q-RPT pressure relief valve
E Lo Q-RPT (ref pressure transducer)
F Hi Q-RPT (ref pressure transducer)

G TEST port 1 (top)H TEST port 2 (rear)
I Test shut off and fine adjustment valve
J Lo Q-RPT shut off valve
K Reservoir shut off valve
L Variable volume

Figure 12. E-DWT-H with dual Q-RPTs hydraulic schematic

3.5

Pressure Generation And Adjustment

E-DWT-H has three means for generating and adjusting pressure, including filling and priming the test
system.
The reservoir pump is used to fill and prime the test system (see Section 3.5.1). It is important to remove
air from the test system by filling and priming it before using the variable volume to generate pressure.
Failure to fill and prime will result in the need to use multiple variable volume strokes to generatepressure.
The variable volume is used for pressure generation and rough pressure adjustment (see Section 3.5.2).
The test shut off and fine adjust valve is used for fine pressure adjustment (see Section 3.5.3).

© 2009 DH Instruments, a Fluke Company

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3. OPERATION

3.5.1

Filling And Priming, Reservoir Pump

It is important to remove air from the test system by filling and priming it before using thevariable volume to generate pressure. Failure to fill and prime will result in the need to use
multiple variable volume strokes to generate pressure.
The reservoir filling and priming pump is designed to push oil through the E-DWT-H and out
the TEST port into the test system. It can also be used to generate an initial pressure, saving
variable volume stroke.
To fill and prime the test system, prior to generating pressure with the variable volume,
proceed as follows:
See Figure 11 and Figure 12 for a dual Q-RPT or Figure 1 and Figure 8 for a single Q-RPT
E-DWT-H schematic and view when following this procedure.
Leave an open purge point (for example a loose fitting) at the highest point possible in
the test system that is connected to the E-DWT.
If not already open, open the TEST shut off valve to connect the E-DWT-H to the test
system.
Position the reservoir pump correctly by rotating the reservoir cap CW until the reservoir
vent valve is at the CLOSE position. Do not overtighten.
Be sure that the reservoir cap vent valve is open (loosened CCW).
Open the reservoir shut off valve to connect the reservoir to the test system.
Pull the reservoir priming pump knob up slowly to fill it with oil from the reservoir. Thenpush the knob down firmly with moderate speed to seal the tip of the pump against thereservoir seat and inject oil into the E-DWT-H and out the TEST port.
Repeat while observing the open purge point in the test system. When only oil and no
air comes out of the purge point, close and tighten the purge point.
If desired, repeat
to set an initial pressure with the reservoir pump.
Be sure the variable volume is already filled and in the start position (Section 3.5.2,- ), and the reservoir shut off valve is open.
Press down on the pump knob but do not release your downward force when the pumpgets to end of stroke or becomes to difficult to push down. While maintaining thedownward force on the pump knob, close the reservoir shut off valve to capture thepriming pressure.

W Caution
Do not attempt to generate greater than 700 kPa (100 psi) using thereservoir priming pump.
Once the system is filled and primed, use the variable volume to generate pressure to thedesired pressure set point (see Section 3.5.2).

W Caution
When the reservoir cap vent valve is closed, the reservoir is not connected
to atmosphere so opening the reservoir shut off valve and the test shut off
valve may not fully vent the DUT. To be sure the DUT is fully vented toatmosphere, OPEN the reservoir cap shut off valve and/or disconnect at
the TEST port.

Page 25© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

3.5.2

Pressure Generation And Rough Adjustment,
Variable Volume
W Caution
The variable volume can generate very high pressure very quickly. Whenusing the variable volume, use caution not to generate pressure more
quickly than desired and not to exceed the pressure rating of the E-DWT-H,
it’s Q-RPTs or any component of the test system to which it is connected.

The variable volume is used to accomplish large pressure changes and to roughly adjustpressure at a set point. It can generate high pressure with relatively little effort.
The variable volume is not designed to fill and prime the test system. To avoid needing torefill the variable volume to reach the desired pressure, use the reservoir priming pump to fill
and prime the test system before going to the variable volume (see Section 3.5.1).
To generate and adjust pressure with the variable volume, proceed as follows:
Figure 11 and Figure 12 for a dual Q-RPT or Figure 1 and Figure 8 for a single Q-RPT
E-DWT-H schematic and view when following this procedure.
Open the reservoir shut off valve to connect the reservoir to the variable volume.
Close the TEST shut off valve to avoid ‘pulling’ oil out of the test system in step.

Rotate the variable volume CCW until the piston position indicator is at the beginning of
its stroke (indicator white).
Close the reservoir shut off valve to shut off the reservoir from the variable volume.
Open the TEST shut off valve to connect the variable volume to the test system.
If the E-DWT-H is dual Q-RPTs, check that the RPM4-E-DWT Q-RPT selection and Lo
Q-RPT shut off valve setting are correct for the pressure range.
While carefully watching the pressure indicated on the RPM4-E-DWT, rotate the variable
volume CW to increase pressure to the desired set point. Using the variable volume, it
should be easy to adjust the set pressure within 100 psi (700 kPa). To adjust pressure
more finely than is possible with the variable volume, use the fine adjust valve (seeSection 3.5.3).
If the variable volume runs out of stroke (piston position indicator red and variable volume
will not rotate CW further) before the desired set pressure is reached, the variable volume
can be isolated from the TEST port and refilled to continue generating pressure (see ).
To refill variable volume while the test system is under pressure proceed as follows:
Close the TEST shut off valve.
Record the pressure indicated by the RPM4-E-DWT. You will need to reset thispressure to minimize the change in test pressure when you reconnect the refilledvariable volume to the test system
Slowly open the reservoir shut off valve.
Rotate the variable volume CCW to the beginning of its stroke (position indicator
white, variable volume will no longer rotate).
Close the reservoir shut off valve.
Rotate the variable volume CW to generate pressure until the pressure reaches the. Use only the variable volume to adjust the pressure.
value recorded in step
Slowly open the TEST shut off valve to reconnect the variable volume to the test
system. Continue to generate pressure as in .
To reduce pressure, rotate the variable volume CCW.

© 2009 DH Instruments, a Fluke Company

Page 26

3. OPERATIONW Caution
Opening the reservoir shut off valve while the E-DWT-H is under pressure
will very rapidly drop the pressure. Generally, it is not recommended todrop the pressure applied to pressure measuring devices very rapidly. To
reduce pressure slowly, use the variable volume and only open thereservoir shut off valve to open the system to atmosphere.

3.5.3

Pressure Fine Adjustment, Fine Adjust ValveTo adjust pressure more precisely than is possible with the variable volume, the fine adjust
valve is used. When the valve is open, the displacement of its needle is used as a miniature
variable volume to adjust pressure.
The test isolation and fine adjust valve is a needle valve with a stroke of several millimeters.
Turn the valve handle CW to increase pressure CCW to decrease.
When using the fine adjust valve to adjust pressure, be sure not to close the valve so that the
E-DWT-H is no longer connected to the test system. If turning the valve handle or thevariable volume does not change the pressure indicated by both the RPM4-E-DWT and thedevice under test, the valve is closed.

3.6

RPM4-E-DWT User Interface

The E-DWT-H’s RPM4-E-DWT reference pressure monitor is designed to offer the optimum balance
between simple, straight forward operation and the availability of a wide variety of functions with a highlevel of operator discretion if desired.
The RPM4-E-DWT’s local operator interface is through the front panel’s 2 x 20 character alpha-numeric
display, a function/data keypad, a cursor control pad and a Ready/Not Ready indicator. An optional[ENTER] footswitch is available. Remote communication is also available via the RS-232 (COM1)
interface (see Section 4).
The E-DWT-H mounts the RPM4-E-DWT at a convenient viewing angle. If the RPM4-E-DWT has two
Q-RPTs, the E-DWT-H includes a valve and visual indicators to isolate and protect the RPM4-E-DWT’s
Lo Q-RPT when using the Hi Q-RPT (see Section 3.4).

3.6.1

MAIN RUN Screen

The RPM4-E-DWT MAIN RUN screen is its home display that is reached on power-up andfrom which other functions and menus are accessed. It is the very top level of all menu
structures.
The MAIN RUN screen is where RPM4-E-DWT is left in normal operation. It displays thecurrent measured pressure as well as a variety of additional information if desired.
Figure 13 and its legend summarize the RPM4-E-DWT MAIN RUN screen fields and theirfunctions.

Note
RPM4-E-DWT has a screen saver function which causes the display to dim
if no key is pressed for 10 minutes. Pressing a key restores full power tothe display. The screen saver time can be changed or screen saving canbe completely suppressed (see Section 3.9.5.1).

Page 27© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUALP R E SS U RE1 U N IT M hz R R
D D I SP L AYF U N CI O Nnn / n n
DISPLAY FIELDNAMEPURPOSECONTENTS

1. PRESSURE1

Measuredpressure

Displays pressure
measured by theactive Q-RPT

Numerical pressure value and sign.

1.2.3

2. UNIT

Unit ofmeasureIdentifies unit ofmeasure in whichpressure values are
displayed

Pressure unit abbreviation

3.7.3

3. M

Measurement
mode

Not used in the
E-DWT-H.
RPM4-E-DWT
supports gauge mode
only.

<g > for gauge mode

None

4. h

Head
pressure
indicator

Indicates whether afluid head correction
is applied to
PRESSURE1<h>the fluid head is not zero
<blank> fluid head is zero

3.7.8

5. z

AutoZeroindicator

Indicates whether
the AutoZero function
is ON or OFF for theactive Q-RPT andmeasurement mode<z>
AutoZ is ON<blank> AutoZ is OFF

3.9.1

6. RR

ActiveQ-RPT
position
indicator

Indicates the positionof the active Q-RPT in
the RPM4-E-DWT<Hi> Hi Q-RPT<Lo> Lo Q-RPT (only if dual QRPT model)

3.1.1

7. nn/nn

Sequence
progress
indicator

Indicates progress of
AutoTest sequence,
during test execution<NN/NN> Number of this point
over total number of points
in the sequence

3.1.3,

8. DISPLAYFUNCION

Information
specific to
the DISPLAY
mode

Pressure indication
depending on current
RPM4-E-DWTDISPLAY function.
Leading character
identifies the value

Numerical pressure value
and sign.
<PPC EXT DEV:> when the RPM4E-DWT is initialized as an external
device to a PPC pressure
controller.

3.7.7

9. D

Pressure
information
indicator

Pressure information
indicator depending
on current
RPM4-E-DWTDISPLAY function.

<σ>

3.7.7

Display mode is AVERAGE
and value is standard deviation<R> Display mode is RATE andvalue is pressure rate ofchange per second<H> Display mode is HI/LO andvalue is high, then low<D> Display mode is DEVIATION
and value is difference fromcurrent target<, ↑ , ↓ > Display mode is QRPT and value ismeasurement of inactive QRPT (dual Q-RPT models
only)<F> Display mode is FREEZE andvalue is last captured reading
Blank, no character Current
display mode is CLEAN

Figure 13. MAIN RUN screen display fields© 2009 DH Instruments, a Fluke Company

Page 28

SECTION3. OPERATION

3.6.2

Function / Data Keypad Layout and Protocol

The RPM4-E-DWT has a function/data keypad for local operator access to direct functions,function menus and for data entry.

A The Function/Data keys allow very commonly used

C The Menu/Data keys provide access to function

functions to be accessed directly by a single
keystroke when pressed from the MAIN RUN
screen (see Section 3.6.1). The name of thefunction is on the bottom half of the key. These
keys enter numerical values when editing.
B The Editing and Execution keys are for startingand suspending command execution, cursor control
in menus and editing entries.

menus when pressed from the MAIN RUN screen.
The menu name is on the bottom half of the key.
The SETUP menu is for more frequently usedfunctions (see Section 3.8). The SPECIAL menu isfor functions that are not generally used as a part ofday to day operation (see Section 3.9). These keys
enter numerical values when editing.

Figure 14. Keypad layout

Lo Q-RPT (ref pressure transducer) Pressing [ENT] generally causes execution or forward
movement in the menu tree.
Pressing [ESC] moves back in the menu tree and/or causes execution to cease or suspend.
Pressing [ESC] repeatedly eventually returns to the MAIN RUN screen and, from there,
allows momentary viewing of the RPM4-E-DWT introduction screen.
Pressing the [+/-] key changes a numerical sign when editing. It also toggles throughmultiple screens when available and, from some run screens, is a shortcut to a momentary
display of active RANGE.
Pressing the [ ], [ ], [ ] and [ ] keys allows up, down, reverse and forward cursor
movement when editing data entry or moving in menus.

Note
Some screens go beyond the two lines provided by the display. This isindicated by a flashing arrow in the second line of the display. Pressthe cursor control keys to move the cursor to access the lines that are
not visible or directly enter the number of the hidden menu choice if
you know it.

3.6.3

Optional Remote [ENT] (ENTER) Footswitch

Operating the footswitch is the equivalent of pressing [ENT] on the front panel.
The remote ENTER feature can be particularly convenient when running AutoTests (seeSection 3.1.3) in which the operator’s hands are not free or attention is on the device under
test rather than the RPM4-E-DWT.

Page 29© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

3.6.4

SoundsRPM4-E-DWT is equipped with a variable frequency tone device to provide audible feedback
and alarms. The beeper is used for the following indications.

3.7

Valid key press

Brief beep. Choice between three frequencies or NO
sound is available (see Section 3.9.5.2).

Invalid key press

Descending two tone “blurp”

Change E-DWT-H Lo Q-RPT
shut-off valve setting

Four one second beeps (see Section 3.4).

Leak check completed

Three two second beeps (see Section 3.7.6).

Upper limit exceededIntermittent one second beeps (see Section 3.8.4).

Pmax! (overpressure limit)
exceeded

Eight second high frequency beep (see Section 3.8.4.1).

AutoTest in/out of tolerance
reading

Ascending triad/descending triad (see Section 3.7.11).

Hi Q-RPT is selected but Lo
Q-RPT is being pressurized(dual Q-RPT model RPM4-EDWT only)Intermittent two second high frequency beep. The audible
alarm is combined with flashing of the red, Lo Q-RPT
Active LED on the E-DWT-H (see Section 3.4, 3.7.2).

AutoTest in/out of tolerance
reading

Ascending triad/descending triad (see Section 3.7.11).

RPM4-E-DWT Direct Function Keys
3.7.1

Summary
Note
Table 4 provides a brief summary of RPM4-E-DWT direct function key
operation. It may be useful to keep a copy of this summary near the
E-DWT-H, especially when first becoming acquainted with its operation.

Local operation of RPM4-E-DWT is through the front panel keypad. To minimize multilayered menu structures, the keypad numerical keys also provide direct access to the mostcommonly used functions. The function accessed is labeled on the bottom half of the key.
Direct function keys are active whenever RPM4-E-DWT is in its MAIN RUN screen. Table 4summarizes the operation of the direct function keys.

© 2009 DH Instruments, a Fluke Company

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3. OPERATION

Table 4. Summary of RPM4-E-DWT function key operation
DIRECT FUNCTION KEYS ARE ACTIVE FROM THE MAIN RUN SCREEN
See corresponding manual sections for full detail.

3.7.2

Adjust height of fluid head correction.
Set to zero to defeat correction.

View active range and toggle through available
ranges. [ENT] on a range activates it.

Feature not used in RPM4-E-DWT.

Select pressure unit of measure for the active
range. Choice of units available in this menu
can be customized.

Run the AutoZ function to AutoZero
the active Q-RPT.

Not used. E-DWT-H RPM4-E-DWT is gauge
mode only.

Set up and optimize RPM4-E-DWT
features for a specific operating range.

Menu of less commonly used internal functions
and settings.

Run automated leak checking routine.

Menu of commonly used setup features includingsave/delete AutoRange ranges, set display
resolution, set stability limit, set upper/lower limit,
view AutoTest data

Select the display function for thebottom line of the RPM4-E-DWT
display.

Start or set functions such AutoTest, Leak
Check and Freeze.
ENTER values when
editing.

[RANGE] PURPOSE
To view and/or change the active pressure measurement range and associated settings.
 PRINCIPLE
An RPM4-E-DWT range is defined as a pressure span and associated settings (see Section
3.1.1).
The RPM4-E-DWT has one or two Q-RPTs. Each Q-RPT has a default range which is its
maximum span. Additional ranges, lower than the Q-RPT’s maximum span, may be createdat any time using AutoRange (see Section 3.7.5) or AutoTest (see Section 3.1.3). Ranges
created using AutoRange or AutoTest may be saved, with their settings, for reactivation (seeSection 3.8.1).
The [RANGE] function key allows the available RPM4-E-DWT pressure ranges to be viewed
and selected.
 OPERATION
Pressing the [RANGE] function key activates the range viewing and selecting function.
When the [RANGE] function key is first pressed, the active range is displayed. For example:
1.

Q-RPT designator.

2.

Type of range. DF for the Q-RPT’s default range; AR for a range
created by AutoRange.

3.

Q-RPT position designator.

4.

Current pressure unit of measure.

5.

Full scale pressure in current unit of measure.

Active A70M
bar
700g

DF Hi

Pressing the [RANGE] key again while in the RANGE functions toggles through displays ofthe other available ranges, from lowest range to highest range.
To select a range to become the active range, press [ENT] while the range is displayed.

Page 31© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUALIn E-DWT-H models with two Q-RPTs, any time a range change causes the active Q-RPT tochange, the E-DWT-H Lo Q-RPT shut off valve must be operated to connect or disconnect
the Lo Q-RPT from the TEST port. The green Lo Q-RPT valve position LEDs indicate thecorrect position of the Lo Q-RPT shut off valve knob based on the Q-RPT currently in use(see Section 3.4).
Pressing [ESC] while in the RANGE function returns to the MAIN RUN screen without
making a range change.

W Caution
In E-DWT-H models with two Q-RPTs, the Lo Q-RPT shut off valve protects
the Lo QRPT from overpressure when the Hi Q-RPT is in use. Familiarize
yourself with E-DWT-H operation (see Section 3.4) before changing ranges
and applying pressures. Always turn the Lo Q-RPT shut off valve fully inthe direction of the lighted green LED before applying pressure.

Note

3.7.3

•

Range full scale limits are given in the pressure unit that is currently
active for that range.

•

Pressing [+/-] from the MAIN RUN screen provides a shortcut to a
momentary view of the active range.

•

Many RPM4-E-DWT settings and functions are range specific. See
Table 3 for identification of range specific settings.

•

For best metrological performance, ventRPM4-E-DWT Q-RPT before changing ranges.

andAutoZerothe[UNIT]

 PURPOSE
To select the unit of measure in which RPM4-E-DWT displays pressure values.
 PRINCIPLE
RPM4-E-DWT allows the unit of measure in which pressure values are displayed to bechanged.
RPM4-E-DWT supports 13 standard pressure units of measure as well as user defined units.
To simplify operation, quick access to up to six units is made available under the [UNIT] key.
The [UNIT] key contents can be customized by the user to any configuration of six units (seeSection 3.9.6).

NoteInternally, RPM4-E-DWT always operates in Pascal (Pa), the SI unit ofpressure. Values of pressure are represented in other units by theapplication of conversion factors to convert from Pa (see Section 7.1.1).
 OPERATIONTo change the active pressure unit of measure for a range, press [UNIT] from the MAIN RUN
screen while the range is active. The display is:
The cursor is on the number corresponding to theactive pressure unit of measure for the active range.

1psi 2MPa 3kPa
4bar

To change the pressure unit of measure, select the desired unit. Making the selection returns
to the MAIN RUN screen with the selected unit active.

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3. OPERATION

Note

3.7.4

•

The pressure unit of measure selected is range specific. When in agiven range, all functions and settings are represented in the current
measurement unit for that range. However, certain internal and/or
metrological functions (e.g., Q-RPT calibration coefficients) are always
represented in Pa regardless of the current range unit.

•

See Section 7.1.1 for tables of the conversion factors used by
RPM4-E-DWT.

•

If the pressure unit selected is inWa (inches of water), the reference
temperature for water density must be specified in a separate menu(choices are 4ºC, 20ºC 60ºF). No reference temperature selection isnecessary for the unit mmWa as the only reference temperaturecommonly used for mmWa is 4 ºC.

•

The choice of up to six units available under the UNIT function can becustomized from a wider selection by the user (see Section 3.9.6). The
units available under the UNIT function can be reset to default (seeSection 3.9.9.2).

[MODE]

 PURPOSE
Not used in E-DWT-H’s RPM4-E-DWT. Measurement mode is always gauge (difference
from atmospheric pressure).

3.7.5[AUTORANGE] PURPOSE
To automatically set up the RPM4-E-DWT to optimize its measurement characteristics andfeatures for a specific, user defined pressure range of operation.
 PRINCIPLE
RPM4-E-DWT is designed to support the calibration and test of a very wide variety of test
ranges.
The AutoRange function simplifies the task of setting measurement parameters appropriate
for the specific range in which a test is to be run. These are set automatically based on
operator entry of desired measurement mode, pressure unit of measure and range full scale. In
dual Q-RPT models, AutoRange also selects to most appropriate Q-RPT.
The selections and settings made by AutoRange are summarized in Table 5.
A range set up using AutoRange and all its range specific settings, may be saved for recall
using [SETUP], <1range> (see Section 3.8.1). Saved ranges are available for later selection
using [RANGE] (see Section 3.7.2). If a range created by AutoRange is not saved, it isoverwritten by the next AutoRange or erased when another range is selected.

NotePress [ENT] from the main run screen in Rate DISPLAY mode to use the[AutoTest] function to AutoRange the RPM4-E-DWT based on DUT
tolerance (see Section 3.7.11).

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

Table 5. Settings made by AutoRange
SETTING/SELECTIONPURPOSESET TOSECTION

Unit

Set pressure unit of measure

Operator specified during
AutoRange

3.7.3

Full scale

Establish span maximum

Operator specified during
AutoRange

None

AutoRange span

Basis of span based setting
calculations

Zero gauge to AutoRange full
scale

None

Q-RPT

Select most appropriate Q-RPT
to cover range and mode.

Q-RPT with lowest span whose
full scale is greater than
AutoRange full scale

1.2.3.1

Upper limit

Set maximum pressure alarm
limit.

105 % of operator entered fullscale pressure

3.8.4

Resolution

Set display resolution

0.01% of AutoRange span or
1 ppm of default Q-RPT span,
whichever is larger

3.8.2

Stability Limit

Set Ready/Not Ready stability
criterion.

0.01% AutoRange span or 5
ppm of default Q-RPT span,
whichever is larger

3.8.3

 OPERATION
To use the AutoRange function, press [AutoRange] and respond to the RPM4-E-DWT’sprompts.
Select pressure unit of measure: The screen is identical in appearance and function
to the [UNIT] screen (see Section 3.7.3).
Enter the AutoRange full scale pressure: Enter the full scale pressure value in the<------> entry field and press [ENT]. If the full scale value entered exceeds the maximumof RPM4-E-DWT, an error message appears.
View proposed AutoRange range: The proposed AutoRange range screen is:1.

Indication that this is a screen of the proposed AutoRange
range.

2.

Designator and position of the Q-RPT that AutoRange has
selected to cover the AutoRange full scale and measurement
mode.

3.

Pressure unit of measure specified in AutoRange.

4.

AutoRange full scale pressure.

AutoRange A70M
psi
5000g

Hi

Note
IN a dual Q-RPT model, if AutoRange selects a Q-RPT but you would liketo use the other one, the cursor control keys may be used to toggle
between Q-RPTs so that the other can be selected.
Accept proposed AutoRange: To accept the proposed AutoRange and go to the MAIN
RUN screen with the new AutoRange range active, press [ENT] or [AutoRange]. To
modify the AutoRange full scale or pressure unit of measure, use [ESC] to back throughthe AutoRange screens and make changes.

Note•

In a dual Q-RPT model, the E-DWT-H Lo Q-RPT Shut off valve protects
the Lo Q-RPT (1 000 psi max) from overpressure when the Hi Q-RPT is
in use. Familiarize yourself with E-DWT-H operation (see Section 3.4)
before changing ranges and applying pressures. Always turn the Lo
Q-RPT Shut off valve fully in the direction of the lighted green LED
before applying pressure.

© 2009 DH Instruments, a Fluke Company

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3. OPERATION

3.7.6

•

To verify or confirm the range from the MAIN RUN screen, use [+/-] or[RANGE] to view the active range (see Section 3.7.2).

•

See Table 5 for a listing of all selections and settings affected by
AutoRange and their values.

[LEAK CK] PURPOSE
To run an automated leak check routine that determines the leak rate of the system
connected to the E-DWT-H TEST port.
 PRINCIPLE
The LEAK CHECK function is provided as a means of checking and quantifying the leaks that
may be present in the system connected to the E-DWT-H TEST port.
The principle of the LEAK CHECK function is the measurement of the natural decrease or
increase of pressure in a fixed volume over time. The LEAK CHECK function allows a leakcheck time to be set. The total pressure change and the average rate of change over theleak check time are calculated and displayed.
 OPERATION
To run a leak check, first set the pressure to the desired leak check pressure.

Note
Changing the pressure in a test system causes adiabatic temperaturechanges in the pressurized medium that need to have dissipated before avalid leak measurement can be made. In general, a 0.5 to 1 minute wait
before running a leak check is adequate to allow the adiabatic temperaturechange to dissipate and valid leak measurements to be made. However,stabilization time may be much longer for large pressure changes and asvolume and pressure increase.
To access the LEAK CHECK function, press [LEAK CHECK] from the MAIN RUN screen.
Select <1run> to run a leak test. The display is:1.

Edit field for the time over which the leak rate will be
determined, in seconds.

Set leak check time:
15 s

Edit the leak check time if desired (minimum 1, maximum 999 seconds) and press [ENT].
Press [ENT] again when ready to start the leak test. The leak test display is:1.

Standard MAIN RUN screen first line showing measured
pressure.

2.

Active Q-RPT position indicator3.

Indication that leak test is running and countdown of timeremaining.

Page 355657 psi g
Leak testing

Hi
13 s

© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL[ESC] can be used to abort the running leak test. [ENT] while the leak test is running restarts
the leak check timer.
When the leak check timer countdown has completed,
RPM4-E-DWT beeps three times and the leak check results screen is displayed:1.

Total pressure change from start to finish of leak check time.

2.

Indicator of Q-RPT used to run the leak check.

3.

Average rate of change of pressure over the leak checktime period (∆P/time in seconds).

∆P
0.61 psi g Hi
Rate 0.06 psi/sec

From the leak check results screen, press [ENT] to repeat the leak test.
Press [ESC] to return to leak check main menu and exit to the MAIN RUN screen.
To view the results of the most recently completed leak check, press <2view>. If NO leakcheck data is stored (i.e., if the RPM4-E-DWT has never run a leak test or a reset has
cleared previous leak test results), the results screen displays <Data NOT available> briefly
and returns to MAIN RUN screen. Press [ENT] or [ESC] to return to the MAIN RUN screen.

Note
Leak check is range specific in the sense that a leak check is run using theactive range. However, only one set of leak check results is maintained inmemory and each leak test completed overwrites the memory. View leakcheck always shows the results of the last leak check run regardless of therange that is now active. The results screen includes the range indicator
to indicate the range in which the leak check was run.

3.7.7

[Display] PURPOSE
To select, from a variety of choices, the information that is displayed on the second line of the
RPM4-E-DWT display.
 PRINCIPLE
RPM4-E-DWT supports a variety of advanced pressure measurement functions that are
displayed on the second (bottom) line of the RPM4-E-DWT display. In summary, theavailable display functions included are:
AVERAGE

Calculates the average measured pressure over a user specified period of timeand displays the average, the standard deviation about the mean and acountdown in seconds to the next average (see Section 3.7.7.1). This function isoften used to filter out pressure noise in an unstable system. The magnitude of thenoise is quantified by the standard deviation about the mean. A second Avg
screen allows the instantaneous pressure values to be viewed during an
averaging cycle.

RATE

Calculates and displays the current rate of change of pressure in current
pressure units/second (see Section 3.7.7.2). This function is a useful indicationof the stability of the pressure being measured. It is often used as an indicationof positive or negative leak rate and as a go/no go criterion of when to takedata when comparing RPM4-E-DWT and a device under test, for example in acalibration. Rate is used by the Ready/Not Ready function to determine whena Ready condition exists (see Section 3.1.2).

DEVIATION Continuously calculates and displays the difference between the pressure
measured by RPM4-E-DWT and a target pressure entered by the user (see Section
3.7.7.3). This function is useful in monitoring the evolution of pressure aroundand/or away from a desired set point.
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3. OPERATION

RPTIn dual Q-RPT RPM4-E-DWT models, allows pressure measurement from both
Q-RPTs to be displayed simultaneously (see Section 3.7.7.4).

HI/LO

Records and displays maximum and minimum pressures measured (seeSection 3.7.7.5). This function is used to keep track of the minimum andmaximum pressure observed in a system over a period of time or to monitor if
a pressure min/max limit has been exceeded.

FREEZE

Captures and displays the pressure measured by the active range of
RPM4-E-DWT when the [ENT] key is pressed (see Section 3.7.7.6). Thisfunction is useful to record the pressure present at the time of an operator
observed trigger event, for example when the needle of an analog gauge is on
the nominal point or when a switch activates.

CLEAN

Blanks out the second line of the display (see Section 3.7.7.7). This function isused when a simple display of pressure measured by the RPM4-E-DWT active
range with minimal additional information is desired.

 OPERATIONTo set the DISPLAY function press [DISPLAY] from the main run screen.
1Avg 2Rate 3Dev 4RPT
5Hi/Lo 6Freez 7Cln

The display is:

The cursor is on the active DISPLAY function. Selecting a DISPLAY function returns to themain run screen with the selected function active. See Sections 3.7.7.1 to 3.7.7.7 for
information on each of the DISPLAY choices.

Note•

The DISPLAY selection is NOT range specific. A DISPLAY selection
made in one range applies to all ranges.

•

The default DISPLAY function is Rate which causes the second line ofthe display to show “R” followed by the current rate of change ofpressure in current pressure units per second.

•

To access AutoTest, the current DISPLAY function selection must be
one that does not use the ENTER key: Rate, RPT, Clean.

3.7.7.1

Avg (Average)

 PURPOSE
To activate the Average DISPLAY and/or adjust the period of time over which
averaging occurs.

Note
See Section 3.7.7.  Principle.
 OPERATION
To access the Average DISPLAY, press [DISPLAY], <1Avg>. The display is:1.

Edit field for averaging period in seconds.
Default is 20. Minimum 1, maximum 999.

Averaging Period:
20 s

Edit the averaging time period if desired. Press [ENT] to return to the main run
screen with the Average DISPLAY active.

Page 37© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUALWith the Average DISPLAY active the main run screen is:
1.

Average measured
averaging period.

over

last

completed

2.

Standard deviation
averaging period.

of

last

completed

3.

Countdown in seconds until completion of
on-going averaging period.

2007 psi g
Hi
δ 0.2
18Avg

The Average DISPLAY has a second screen that allows the instantaneouspressure readings to be viewed while an averaging cycle is running.
The instantaneous Average screen is:1.

Instantaneous pressure values at RPM4-EDWT’s normal update rate.

2.

Current rate of change of pressure in pressure
units/second.

3.

Countdown in seconds until completion of ongoing averaging period.

2006 psi g
Hi
R 0.1/s
18Avg

The [+/-] key toggles between the main run Average screen and theinstantaneous values Average screen.

Note•

Pressing [ENT] while in the Average DISPLAY aborts thecurrent averaging period and causes a new one tobegin. [ENT] can thus be use to trigger a new averaging
period on demand.

•

In the Average DISPLAY the Ready/Not Ready indication
applies to the result of the previous averaging period(see Section 3.1.2). Ready indicates that all readings
during the previous averaging period met the stability
criterion.
Not Ready indicates that one or more
readings were outside of the stability criterion.

•

Changing the pressure unit of measure, measurementmode or range while the averaging screen is active,
starts a new averaging period.

•

To go to a DISPLAY other than Average, press[DISPLAY] and make a new DISPLAY choice (seeSection 3.7.7).

3.7.7.2

Rate

 PURPOSE
To activate the Rate DISPLAY.

Note© 2009 DH Instruments, a Fluke Company•

See Section 3.7.7,  Principle.

•

The Rate run screen accesses the AutoTest function(see Section 3.7.11) to AutoRange RPM4-E-DWT basedon DUT characteristics. To access AutoTest, press[ENT] from the Rate run screen.

Page 38

3. OPERATION

 OPERATION
To activate the Rate DISPLAY press [DISPLAY], <2Rate>. Pressing <2Rate>
returns to the main run screen with the Rate DISPLAY active.
With the Rate DISPLAY active the main run screen is:1.

Current rate of change of pressure in current
pressure unit per second.

850.1 bar g
R 0.1/sec

Hi

Note

3.7.7.3•

The Rate DISPLAY is different and separate from thestability setting which is used to set the stability
criterion on which the Ready/Not Ready indication isbased (see Sections 3.8.3 and 3.1.2). The Rate DISPLAY
only causes the current rate of change to be displayed
and has NO affect on the stability setting or the
Ready/Not Ready condition.

•

The Rate DISPLAY is the default RPM4-E-DWT main run
screen display.

•

To go to a DISPLAY other than Rate, press [DISPLAY]
and make a new DISPLAY choice (see Section 3.7.7).

DEV (Deviation)

 PURPOSE
To activate the Deviation DISPLAY and/or set the deviation target value.

Note
See Section 3.7.7,  Principle.
 OPERATION
To activate the Deviation DISPLAY press[DISPLAY], <3Dev>. The display is:

Target:9000 psi g

Edit the desired target value. Pressing [ENT] returns to the main run screen with
the Deviation DISPLAY active using the entered target value.

Note
The target value is the value from which deviations (D) aremeasured by the Deviation DISPLAY following:D = current pressure - target pressureWith the Deviation DISPLAY active the main run screen is:1.

Deviation of current pressure from the target
value.

2.

Target value.

Page 398998
D -2

psi g zH3
T9000.0© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

Note

3.7.7.4•

Pressing [ENT] from the main run screen when the
Deviation DISPLAY is active goes directly to the Target
editing screen. This allows the target value to bechanged and without going through the DISPLAY menu.

•

If the pressure measurement unit or mode is changed
while the Deviation DISPLAY is active the target value
remains at the same numerical value.
It is NOT
converted.

•

To go to a DISPLAY other than Deviation, press[DISPLAY] and make a new DISPLAY choice (seeSection 3.7.7).

RPT PURPOSE
To activate the Q-RPT DISPLAY (dual Q-RPT RPM4-E-DWT models only).

Note
See Section 3.7.7,  Principle.
 OPERATIONNote
For the sake of clarity, when describing the Q-RPT DISPLAY,
the Q-RPT displayed on the top line of the display when the
Q-RPT function is selected is referred to as the “active” Q-RPT.
The other Q-RPT to be displayed on the second (bottom) line of
the RPM4-E-DWT display is referred to as the “inactive” Q-RPT.
It is “inactive” in the sense that all Q-RPT specific functions andsettings such as UNIT still apply to the “active” Q-RPT. To
make changes to the “inactive” Q-RPT, for example to change
its pressure measurement unit, it must be made the active
Q-RPT by a range change (see Section 3.7.2).
To activate the Q-RPT DISPLAY, press [DISPLAY], <4RPT>. Operation returns
to the MAIN RUN screen with the inactive Q-RPT displayed on the display’s
bottom line. The range of the inactive Q-RPT is always the default range, not an
AutoRanged range (see Section 3.1.1).
With the Q-RPT DISPLAY active the main run screen is:1.

Active RPT display.

2.

Inactive RPT display with Ready/Not Ready
indicator on far left.

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Page 40

9911 psi g*0.0 psi g

zHi
zLo

3. OPERATION

Note•

When the Q-RPT display is active, executing a rangechange to a range on the inactive Q-RPT makes theinactive Q-RPT the active Q-RPT. The DISPLAY defaults
back to Rate ( Section 3.7.7.2).

•

To go to a DISPLAY other than Q-RPT, press [DISPLAY]
and make a new DISPLAY choice (see Section 3.7.7).

3.7.7.5

HI/LO

 PURPOSE
To activate the Hi/Lo DISPLAY.

Note
See Section 3.7.7,  Principle.
 OPERATION
To activate the Hi/Lo DISPLAY press [DISPLAY], <5Hi/Lo>. Pressing <5Hi/Lo>
resets the Hi/Lo values and returns to the main run screen with the Hi/LoDISPLAY active.
With the Hi/Lo DISPLAY active the main run screen is:1.

Highest pressure observed since Hi/Lo reset.

2.

Lowest pressure observed since Hi/Lo reset.

9911
H 9922psi g zHi
L9800

The Hi/Lo values change each time a new Hi or Lo pressure is measured.

Note

3.7.7.6•

The Hi/Lo record can be reset at any time by pressing[ENT]. This allows a Hi/Lo reset without going backthrough the DISPLAY menu.

•

If the pressure measurement unit, mode or range ischanged while the Hi/Lo DISPLAY is active, Hi/Lo resets.

•

To go to a DISPLAY other than Hi/Lo, press [DISPLAY]
and make a new DISPLAY choice (see Section 3.7.7).

Freeze PURPOSE
To activate the Freeze DISPLAY.

Note
See Section 3.7.7,  Principle.

Page 41© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL OPERATION
To activate the Freeze DISPLAY press [DISPLAY], <6Freeze>. Pressing<6Freeze> returns to the main run screen with the Freeze DISPLAY active.
With the Freeze DISPLAY active the main run screen is:1.

Pressure measured by active range of
RPM4-E-DWT when [ENT] was pressed(displays 0.00 by default when Freeze
DISPLAY is first activated).

9913
F 9912

psi g

zHi

Pressing [ENT] causes the current pressure measured by the active
RPM4-E-DWT Q-RPT to be captured and displayed.

Note•

If the pressure measurement unit, mode or range ischanged while the Freeze DISPLAY is active, the Freeze
value defaults back to zero.

•

To go to a DISPLAY other than Freeze, press [DISPLAY]
and make a new DISPLAY choice (see Section 3.7.7).

•

The AutoTest function uses the Freeze display tocapture the measured pressure value when ENTER ispressed at the test point (see Section 3.1.3).

3.7.7.7

Clean

 PURPOSE
To activate the Clean DISPLAY.

Note
See Section 3.7.7,  Principle.
 OPERATION
To activate the Clean DISPLAY press [DISPLAY], <7Cln>. Pressing <7Cln>
returns to the main run screen with the Clean DISPLAY active.
With the Clean DISPLAY active the main run screen is:1.

Conventional main run screen first line.

2.

“Clean” second line.

9913

psi g

zHi

Note
To go to a DISPLAY other than Clean, press [DISPLAY] andmake a new DISPLAY choice (see Section 3.7.7).

3.7.8[HEAD]

 PURPOSE
To cause a pressure fluid head correction to be added to or subtracted from the pressure
measured by the RPM4-E-DWT Q-RPT in order to predict the pressure at a height other thanthe E-DWT’s reference level.
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3. OPERATION PRINCIPLEThe RPM4-E-DWT measures gauge pressure at the height of the E-DWT’s top surface TEST
port. Frequently, when performing a calibration or test, the device or system under test is ata different height than the E-DWT’s TEST port. This difference in height, frequently called
head, can cause a significant difference between the pressure measured by the E-DWT-H at
its TEST port height and the pressure actually applied to the device under test at a different
height. When that is the case, it is useful to make a head correction to the pressure
measured by the RPM4-E-DWT in order to predict the pressure actually applied at a different
height.
RPM4-E-DWT can accurately determine “head” pressures for liquids (oil, water) as thepressurized medium. In calculating the head value, standard gravity (9.80665 m/s2) is used.
A custom liquid density may also be specified.
The [HEAD] function key is used to specify the height difference between the E-DWT-HTEST port and another height. Entering a height of zero turns the function off. The height
units and the test medium can be changed using [SPECIAL], <3Head> (see Section 3.9.3).

Note
An oil head has a pressure value of about 0.04 psi/inch (0.1 kPa/cm).
 OPERATIONNote
For the head function to be used as described here, the RPM4-E-DWT
must be AutoZeroed to the TEST port reference level following the
AutoZeroing instructions in Section 3.7.10.
To access the HEAD function, press [HEAD]. The display is:1.

Test fluid currently specified for the head correction.

2.

Edit field for head height.

Edit head height:
+ 14
in
oil

Edit the head height to the desired value. Press [ENT] to return to the MAIN RUN screenwith the new head correction active. Press [ESC] to return with no changes.
Note
For the head function to be used as described
here, the RPM4-E-DWT must be AutoZeroed to
the TEST port reference level following the
AutoZeroing instructions in Section 3.7.10.
The reference height of the RPM4-E-DWT
pressure measurement is the E-DWT-H TEST
port weep hole. The head height should beentered as a positive value if the device orsystem under test is higher than the reference
level and negative if it is lower.

Page 43© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUALNote•

The HEAD function is NOT range specific. The HEAD ON or OFF
status remains the same as Q-RPTs and ranges are changed. Edits
made to the head settings are independent of active range or
Q-RPT.

•

When a head correction is being applied, it is indicated by <h> inthe fourth character from the right in the top line of the MAIN RUN
screen (see Section 3.6.1). When the head correction is zero, the<h> is not shown.

•

To change units of head height between inches and centimeters
and to change the test fluid species, use [SPECIAL], <3head> (seeSection 3.9.3).

3.7.9

[SDS]

 PURPOSEThe SDS function is not used in RPM4-E-DWT.

3.7.10[AUTOZ] PURPOSE
To run the AutoZ function that zeros the active Q-RPT.
 PRINCIPLE
See Section 3.9.1,  Principle, for a full explanation of the AutoZ function.
The RPM4-E-DWT should be zeroed prior to running a calibration or test with the E-DWT.
 OPERATIONNote
For the AutoZ function key to run AutoZ, AutoZ must be turned ON for theactive range and measurement mode. AutoZ ON is indicated by <z> to theleft of the Q-RPT designator on the first line of the main run screen. AutoZ
ON and OFF is set using [SPECIAL], <1AutoZ> (see Section 3.9.1). If AutoZ
is OFF for the active Q-RPT, and measurement mode, <AutoZ is off> isdisplayed when [AutoZ] is pressed.
To properly zero the RPM4-E-DWT prior to running a calibration or test, proceed as follows:
Close the reservoir shut off valve.
Open the TEST shut off valve.
Open the test system (disconnect) at the E-DWT-H TEST1 (top) port.
Be sure that the E-DWT-H is filled with oil up to the TEST port weep hole. Use thevariable volume to raise the oil level if necessary.
Press [AutoZ] from the RPM4-E-DWT main run screen. <Running gauge AutoZ> isdisplayed briefly before returning to the main run screen.

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3. OPERATION

Note•

Before running AutoZ in gauge mode, ensure that the pressure applied
to the Q-RPT is truly zero gauge (atmospheric pressure). If running
AutoZ in gauge mode results in a zero offset that RPM4-E-DWT
considers unusually large, <Confirm 0 gauge P!> is displayed. Check
that zero gauge pressure is applied to the E-DWT-H TEST port, thereservoir shut off valve is closed and the TEST shut off valve is open.

•

Allow the RPM4-E-DWT to stabilize at atmospheric pressure for 2 to 3
minutes before running AutoZ in gauge mode.

3.7.11[ENT/AutoTest] (Run AutoTest)

 PURPOSE
To run the AutoTest function which automatically runs a calibration test sequence (Quick Test
or File Test).

Note
Run AutoTest is accessed by pressing [ENT] from the Rate, RPT or Clean
DISPLAY mode (see Section 3.7.7). In other DISPLAY modes, the functionof [ENT] is specific to the mode.
 PRINCIPLE
RPM4-E-DWT supports AutoTest automated sequences to assist in the testing or calibrationof analog gauges and other pressure sensitive devices.
The AutoTest function is intended to:•

AutoRange the RPM4-E-DWT (see Section 3.7.5) to the range of the DUT being
tested with settings appropriate for the tolerance of the DUT.

•

Step the operator through a planned sequence of test pressure increments if desired.

•

Alert the operator to possible out of tolerance conditions at each test point.

•

Log test data in RPM4-E-DWT that can be viewed following the test.

There are two types of AutoTest: Quick AutoTest and File AutoTest.
•

Quick AutoTest: The DUT and test parameters are entered “on the fly” during theinitialization of the test, then the test is executed if desired. In Quick AutoTest tests,
the test points are defined in % of test FS pressure.

•

File AutoTest: The DUT and test parameters are stored in a file (see Section 3.8.5.2)
and retrieved when a DUT is to be tested. In File AutoTests, test points are defined
individually.

AutoTest operation is oriented towards running tests in which the pressure is set to the DUT
cardinal point indication and then the actual reference pressure present is read from the
RPM4-E-DWT.
AutoTest Settings and Calculations
The data required to initialize an AutoTest is either entered “on the fly” (Quick AutoTest) or
retrieved from a file (File AutoTest). The data items required are:•Pressure unit of measure.

•

DUT full scale in pressure unit of measure.

•

DUT tolerance in ± % FS (full scale).

•

Test increment in % FS (Quick AutoTest) or number of test increments and the value ofeach increment in the pressure unit of measure (File AutoTest).
Page 45© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL•

Test point sequence: ascending, descending or both (Quick AutoTest only).

The initialization data is used to AutoRange the RPM4-E-DWT appropriately for the DUT and test
to be run. At the end of the AutoTest initialization, the RPM4-E-DWT is AutoRanged as follows(see Section 3.7.5, Table 5):•

RPT: The Lo Q-RPT is active if the maximum pressure in the AutoTest is equal to or lessthan 1 000 psi (7 MPa), the Hi Q-RPT is active if the maximum pressure in the AutoTest
is greater than 1 000 psi (7 MPa).

•

Pressure unit of measure: As specified in the AutoTest initialization.

•

Display resolution: The DUT tolerance divided by 10 and rounded to the nearest digit, or
1 ppm of Q-RPT span, whichever is greater.

•

Stability test for Ready/Not Ready indication (see Section 3.1.2): The DUT tolerance
divided by 10, or 2 ppm of Q-RPT span, whichever is greater.

•

Upper limit (UL): The DUT full scale plus 5 %, or the Q-RPT’s maximum UL, whichever isless (see Section 3.8.4).

To AutoRange the RPM4-E-DWT based on DUT characteristics but not execute an AutoTest, theAutoTest can be aborted just after the initialization. Then the RPM4-E-DWT is set up
appropriately for the DUT to be tested but the AutoTest increments don’t execute.
See OPERATION in this Section for information on running a Quick or File AutoTest.
See Section 3.8.5.2 for information on setting up File AutoTest files.
See Section 3.8.5.1 for information on viewing the data files that result from running a File
AutoTest.
 OPERATION
To run an AutoTest, press [ENT] from the Rate, RPTor Clean run screen (DISPLAY modes that do not use[ENT] (see Section 3.7.7)). The display is:

Run AutoTest:
1Quick 2File

Select <1Quick> to run a Quick AutoTest or <2File> to run a File AutoTest (see PRINCIPLE
above in this Section) and operation proceeds to test initialization.

3.7.11.1 AutoTest Initialization
When <2File> is selected to run a File AutoTest, the test initialization information
is obtained from the file selected. Operation proceeds directly to the test
confirmation. The RPM4-E-DWT asks the operator to confirm the range of the
AutoTest (<ENTER to run…>), AutoRanges (see Section 3.7.5) and operation
proceeds directly to test execution (see Section 3.7.11.2).
When <1Quick> is selected to run a
Quick AutoTest, the display is:

Run current Quick
AutoTest:
1yes 2noSelect <1yes> to rerun the last Quick AutoTest (see below in this Section).
Select <2no> to define a new Quick AutoTest.
When <2no> is selected from the <Run current Quick AutoTest> screen, theAutoTest set-up/edit routine is accessed. The information needed to AutoRange
RPM4-E-DWT based on the DUT characteristics is then collected in successive
screens as follows.

© 2009 DH Instruments, a Fluke Company

Page 46

3. OPERATION•<Pressure units of measure>: The units of measure screen from the[UNIT] function key is presented (see Section 3.7.3). Select the desiredpressure unit of measure. The choice of units may be modified (see Section
3.9.6).

•<DUT full scale>: Enter the full scale pressure (maximum pressure) of
the DUT in the measurement mode and pressure units that have been
specified in the previous two steps.

•<DUT tolerance>: Enter the DUT measurement uncertainty, accuracy
or precision specification as desired in ± % FS (percent of full scale).
This value will be used to determine appropriate RPM4-E-DWT
resolution and stability test settings.

•<Test increment>: Enter the test increment in % FS of the DUT.
When executing the test, the test increments will be from zero to the DUT fullscale, dividing by the value of the increment. If a non-even increment value
is entered, the actual increments will be rounded to the lower number ofincrements. For example, if the DUT full scale is 10 000 psi and theincrement specified is 42 %, the Sequence will run points of 0, 5 000 and
10 000 psi because 42 % goes into 100 less than three but more than twotimes.

•<Test point sequence>: Select <1up> for the AutoTest sequence torun from zero to the DUT full scale; <2down> for the sequence to start at
the DUT full scale and run down to zero, <3u&d> for the sequence to run
from zero to the DUT full scale and back to zero; <4d&u> for thesequence to run from the DUT full scale down to zero and back to the
DUT full scale.

After the last test definition entry, a screen is offered for the user to check thatthe correct test has been defined or selected and that it does not exceed therange of the device or system being tested:
1.

Indication of minimum and maximum
pressure included in the sequence which isabout to run.

ENTER to run psi g
0 to 5000

Pressing [ESC] returns to the AutoTest selection screen without AutoRanging the
RPM4-E-DWT and without sequence execution. Pressing [ENT] causes the
RPM4-E-DWT to AutoRange based upon the DUT characteristics (see Section 3.7.5)
and the AutoTest proceeds to text execution (see Section 3.7.11.2). To AutoRange the
RPM4-E-DWT based on DUT characteristics but not run a test sequence, [ESC] rightafter AutoRanging completes (at the <Set valve for…> screen).

3.7.11.2 Test Execution
The last step of test initialization is to AutoRange the RPM4-E-DWT (see Section
3.7.11.1), then test execution begins.
In dual Q-RPT E-DWT-RPM4 models, thefirst step of test execution is to set the
E-DWT-H Lo Q-RPT shut off valve correctly
for the Q-RPT that will be used to run thetest (see 3.4). The RPM4-E-DWT display is(<XX> is Lo or Hi):Set valve for XX RPT

Set the Q-RPT shut off valve to shut off or connect the RPM4-E-DWT’s Lo
Q-RPT as indicated by the E-DWT-H valve indicator LED (see Section 3.4). TurnPage 47© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

the valve knob fully towards the lit valve indicator LED until it reaches its stop.
Press [ENT] when ready to proceed with the test.

Note
To abort the test but use the RPM4-E-DWT with the settings forthe DUT that was initialized, press [ESCAPE] from the <SETVALVE FOR xx RPT> screen. This can be useful for setting up
the RPM4-E-DWT to make DUT adjustments or run tests otherthan the one defined by the AutoTest.
0.0 psi g
Hi
Exercise DUT & [ENT]The display is:

The top line is the standard RPM4-E-DWT run screen indicating the current
measured pressure (see Section 3.6.1). Exercise the DUT if desired using the
top line indication of the measured pressure and press [ENT] when complete.
While displayed, the RPM4-E-DWT can be AutoZeroed (see Section 3.7.10).
AutoZeroing before starting the test is recommended.
The display is:1.

Standard RPM4-E-DWT run screen indicating
current measured pressure.

2.

Number of this test point/the total number oftest points in the sequence.

3.

Pressure to set for this increment in current
pressure unit of measure and measurementmode.

0.0 psi g
Set 0.0Hi
1/11

Adjust the pressure to the <Set nnnn> value indicated. Set the pressure so thatthe DUT, NOT the RPM4-E-DWT, indicates the <Set nnnn> value.
Once the specified pressure has been set, press [ENT]. If the RPM4-E-DWT
pressure reading is in Not Ready (pressure not stable) condition (see Section
3.1.2), the RPM4-E-DWT makes an invalid entry sound and displays <Pressure
NOT READY, TRY AGAIN>. Wait for pressure stability or correct the conditions
that are causing the RPM4-E-DWT reading to be excessively unstable and press[ENT] again. If the RPM4-E-DWT pressure reading is in Ready condition, theRPM4-E-DWT makes a valid entry sound and the display is:1.

Standard RPM4-E-DWT run screen indicating
current measured pressure.

2.

Number of this test point/the total number oftest points in the sequence.

3.

<F> to indicate freeze (see Section 3.7.7.6)
followed by the RPM4-E-DWT pressure
reading in current units of measure captured
when [ENT] was pressed in the previous<Set> screen. This is the reference pressurethat was applied to the DUT when the DUT
indicated the cardinal point.
The frozen
pressure value flashes and <OT> follows thenumber if the reading was out of tolerance(definition of out of tolerance is: Set point –RPM4-E-DWT reading > DUT tolerance)..

497.7 psi g
F497.6
OT

Hi
2/11

Press [ENT] to accept this test point and proceed to the next test point or [←] torepeat the point.
Repeat the set pressure, take reading and accept data procedure until all points
in the sequence have been accepted.
After the last pressure point in the sequence
has been accepted the display is:© 2009 DH Instruments, a Fluke Company

Page 48

AutoTest complete
1data 2new 3repeat

3. OPERATION

Select <1data> to view the data collected in the AutoTest that was justcompleted (see Section 3.8.5.1).
Select <2new> to run a new Quick or File AutoTest.
Select <3repeat> to repeat the AutoTest that was just completed.
Press [ESCAPE] to return to the main run screen.

3.8
[SETUP]PURPOSE[SETUP] accesses a menu of functions and features commonly used in setting up and using the RPM4-E-DWT.
OPERATION

To access the SETUP menu, press [SETUP] from the MAIN RUN
screen. The display is:

1range 2res 3stab
4UL 5ATest

SETUP menu choices include:<1range>

Save and delete ranges created by AutoRange (see Section 3.8.1).

<2res>

Adjust the resolution of pressure displays (see Section 3.8.2).

<3stab>Adjust the pressure stability limit that is the criterion for the Ready/Not Ready indication(see Section 3.8.3).

<4UL>

Adjust upper pressure limit alarm (see Section 3.8.4).

<5ATest>Set up File AutoTest files and view data files resulting from running AutoTests (See
Section 3.8.5).

3.8.1<1RANGE> PURPOSE
Save AutoRange ranges and associated settings for recall.
AutoRange ranges.

Delete previously saved

 PRINCIPLEThe RPM4-E-DWT AutoRange function creates a range and automatically sets various
operating parameters proportionally to the range (see Section 3.7.5). Operating settings canthen be changed by the user. Many operating settings are specific to the current range (seeTable 3).
[SETUP], <1range> allows the AutoRange range and associated settings to be saved forrecall using the [RANGE] key (see Section 3.7.2). This can avoid having to recreate
frequently used ranges and settings.
[SETUP], <1range> is also used to delete ranges that have been saved but are no longer
needed.

3.8.1.1

Saving An AutoRange Range

 OPERATION
To save a range created by AutoRange, the range must be the active range.
Use AutoRange or AutoTest to create the range (sees Sections 3.7.5, 3.7.11)
and then make any desired feature and setting adjustments.
Once the AutoRange range is set up as desired, press [SETUP], <1range>,<1save>. The display is:Page 49© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

1.

Indication that this is a range to be saved.

2.

Designator and position of the Q-RPT used by
the range to be saved.

3.

Pressure unit of measure of the range to be
saved.

4.

Full scale pressure of the range to be saved.

Save range A70M
psi
5000g

Hi

Press [ENT] to save the range or [ESC] to return to the MAIN RUN screen
without saving the range.

Note
Default (<DF>) Q-RPT ranges cannot be saved.
permanent.

They areDuplicate AutoRange ranges cannot be saved. A duplicate
AutoRange range is a range that has the same measurementmode and full scale and uses the same Q-RPT as a range thathas already been saved.

3.8.1.2

Deleting AutoRange Ranges

 OPERATION
To delete a single saved AutoRange range, press [SETUP], <1range>,<2delete>. If there are any saved ranges available to delete, the display is:1.

Indication that the cursor control keys may be
used to toggle through the saved ranges toselect the one to be deleted.

2.

Designator and position of the Q-RPT used by
the range to be deleted.

3.

Pressure unit of measure of the range to bedeleted.

4.

Full scale pressure of the range to be deleted.

< and > A70M
psi 5000g

Hi

Use the cursor control keys to toggle through the ranges available to be deleted.
When the desired range to be deleted is displayed, press [ENT]. If you are sure youwant to delete this range, press [ENT] again in response to the <Delete?> query.
[ESC] returns to the <AutoRange:> screen without deleting a range.
To delete all of the saved AutoRange ranges, press [SETUP], <1range>,<3delete all>. If you are sure you want to delete all the ranges, respond <1yes>to the <Delete all saved ranges?> query. If not, respond <2no>.

3.8.2<2RES> (Resolution)

 PURPOSE
To set the resolution with which measured pressures and other pressure indications andsettings are displayed.

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Page 50

3. OPERATION PRINCIPLE
The resolution with which RPM4-E-DWT displays pressure values can be adjusted to be afunction of full scale of the active range or of the current reading. The operator can selectwhich type of resolution setting is used. The default is resolution relative to active range fullscale.
When resolution is set based on active range full scale, resolution is calculated based on the
span of the range and then rounded to the furthest digit to the right. For example, resolutionof 0.001 % on a range of 1 500 psi is 1 500 X 0.001 % = 0.015 which is rounded down to
0.01 psi.
When resolution is set based on current reading, resolution is calculated based on the current
pressure reading and then rounded to the furthest digit to the right. Resolution displayed isthe calculated value, 10 ppm of active range resolution or 1 ppm of Q-RPT range, whicheveris greater.

Note
Default resolution setting is relative to active range and 0.01%. Resolution
is set automatically by AutoRange (see Section 3.7.5) and by AutoTest
initialization (see Section 3.7.11).
 OPERATION
To access the resolution function, press [SETUP],<2res>. The display is:
The cursor is on the current setting. Select the desired
resolution style. This display is (<%FS> or <%Rdg>,
depending on the resolution style selection):

1%Full Scale
2%Reading

Display resltn:
Hi0.0100 %FS< and >

Use the cursor control keys to set the desired level of resolution. Press [ENT] to return to the
MAIN RUN screen with the new resolution setting active or [ESC] to make no changes.

Note

3.8.3

•

The resolution setting is range specific. A resolution setting made in
one range does NOT affect other ranges.

•

The maximum resolution setting is limited in AutoRange ranges thatare less than 10% of the Q-RPT default full scale.

<3stab> (Stability) PURPOSE
To view and/or adjust the stability test that is the Ready/Not Ready criterion for the active
Q-RPT and range.

Note
See Section 3.1.2 Pressure Ready/Not Ready.
 PRINCIPLEThe RPM4-E-DWT continuously monitors the rate of change of pressure measured by the active
Q-RPT and compares this rate to the active stability limit to make a Ready/Not Readydetermination (see Section 3.1.2). The stability function allows the stability limit to be adjusted by
the user to increase or decrease the stability required for a Ready condition to occur.

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

Note•

Default stability when using AutoRange is + 0.01% FS of active range
span. Default stability when AutoRanging as part of an AutoTest is
10% of the DUT tolerance (see Section 3.7.5, Table 5).

•

The stability limit is separate and different from the Rate DISPLAY
function (see Section 3.7.7.2) which allows the current rate of changeof pressure to be displayed.

 OPERATION
To access the stability setting adjustment, press[SETUP], <3stab>. The display is:

Stability limit:
1.0 psi/s

Hi

Edit the desired stability limit setting. [ENT] activates the stability limit for the active range
and returns to the main run screen Press [ESC] to return to the MAIN RUN screen with nochange to the stability limit.

Note
The stability setting is range specific. A stability setting made in one
range does NOT affect other ranges.

3.8.4<4UL> (Upper Limit) PURPOSE
To set the upper pressure limit value for a pressure range and measurement mode.
 PRINCIPLEThe UPPER LIMIT function provides the user with a settable pressure limit at which an alarmsounds.
When the limit is reached, RPM4-E-DWT’s beeper sounds intermittently as long as pressure is
above the limit.
The UPPER LIMIT function has two purposes. First, when UL is set to its default value, it serves
as a warning that the maximum pressure of the active range is about to be exceeded. Second,
UL can be set by the user to a value other than the default value to provide an alarm that a
specific pressure limit has been exceeded. This feature is often used to help protect a system towhich RPM4-E-DWT is connected. For example, it might be set just over the full scale of a device
under test (DUT) that is being calibrated. Note that using AutoRange or AutoTest automaticallysets the UL to just above the AutoRange full scale (see Sections 3.7.5, 3.7.11).

Note
The default upper limit is 105 % of AutoRange span or 102 % of Q-RPT
default (maximum) range when AutoTest is used, whichever is lower.
 OPERATION
To view or edit upper limit of the active range press [SETUP], <4UL>.
The display is:1.

Entry field for upper limit value in active pressure unit ofmeasure and measurement mode.

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Page 52

Upper limit:
714 bar gHi

3. OPERATION

Edit the upper limit value as desired. The maximum upper limit is 105 % of span in an
AutoRange range or 102 % of default Q-RPT full scale, whichever is smaller. Press [ENT] toreturn to the MAIN RUN screen with the new upper limit active. Press [ESC] to return to the
MAIN RUN screen with no change to the upper limit.
When the upper limit has been exceeded, the display of current pressure flashes and a beepsounds for 3 seconds on/2 seconds off intervals. Reduce the pressure applied to
RPM4-E-DWT so that it is below the upper limit to return to normal operation.

Note
Upper limit values are specific to each range and measurement mode.

3.8.4.1

Over Pressure Function

In addition to the UL function, RPM4-E-DWT has an over pressure function.
The over pressure function executes when a Q-RPT measures a pressure that isgreater than 110% of the Q-RPT’s default span.
The over pressure function causes the measured pressure display to flash and asteady beep to sound. The overpressure function also logs the time and date of
the overpressure condition in both user and factory logs to assist in incident
diagnosis (see Section 3.9.7.5).
To recover from an overpressure condition, cycle RPM4-E-DWT power. Before
cycling power, be sure to correct the condition that caused the overpressure.

3.8.5<5ATEST>

 PURPOSE
To view data collected while running an AutoTest and/or to view and edit File AutoTest
definition files.
See Section 3.1.3, PRINCIPLE for information on the AutoTest function.
 OPERATION
To access the ATest menu select [SETUP], <5ATest>. The display is:
Select <1data> to view AutoTest results data (seeSection 3.8.5.1).
Select <2file> to view or edit an AutoTest definition
file (see Section 3.8.5.2).

3.8.5.1

AutoTest:
1data 2file

DATA

 PURPOSE
To view the data files created when an AutoTest is run.

Note
AutoTest data files can also be downloaded via the RPM4-E-DWT’s
COM1 RS232 interface.
See “ATESTDATA” and “ATESTRNG”
commands (Section 4.4.4). A data extraction spreadsheet is available
for free download on www.dhinstruments.com.

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E-DWT-H OPERATION AND MAINTENANCE MANUAL PRINCIPLE
RPM4-E-DWT supports AutoTest automated tests (see Section 3.1.3). When an
AutoTest is run, the RPM4-E-DWT pressure measurement accepted by theoperator at each point is logged. The logged pressure measurements and an
identifying header are stored in a data file. The data file can be viewed
immediately following the last point of the sequence by selecting <1data>. In
addition, the last ten data files recorded can be viewed anytime by selecting[SETUP], <5ATest>, <1data>.
Data File Protocol
Up to ten data files are buffered, ten at a time, in RPM4-E-DWT memory. Whena new AutoTest run is completed, its data file goes to the back of the queue andthe oldest data file is deleted.
Data files are identified by a header whose first line is the full scale of the DUT
and the number of test points in the AutoTest. The second line is the date
(YYYYMMDD) and time (HH:MMa) at which the last point of the sequence
was accepted.
Following the data file header, each test point is recorded including the pressure
reading of the RPM4-E-DWT with head, AutoZ and range status as well as anindication of whether the reading was out of tolerance and the test point number
over the total number of test points in the Sequence.
 OPERATION
To access the AutoTest results data file viewing function press [SETUP],<5ATest>, <1data>.
The first display is the data file header which can be used to toggle throughdata files:
1.

Full scale of the AutoTest with pressure unit ofmeasure and measurement mode.

2.

Number of test points executed/total numberof points in the AutoTest.

3.

Date and time that the last point in the
AutoTest was executed.

6000 psig
6/620070922 10:51:01 am

Press [+/-] or [→] to scroll through the headers of the other AutoTest data files
available. RPM4-E-DWT stores up to ten AutoTest data files in order of
execution with a new data file pushing all the files back and deleting the oldest
one. When the header of the AutoTest data file you would like to view appears,
press [ENT] to view the first point of the identified AutoTest data file.
The display is:1.

RPM4-E-DWT reading logged for the test
point.

2.

Head, AutoZ and Q-RPT indicator (same as in
the RPM4-E-DWT main run screen) (seeSection 3.6.1).

3.

Indication that this is an AutoTest data file
view screen.

4.

<FA> indicating that the AutoTest was a File
AutoTest or <QA> indicating a Quick
AutoTest. This is preceded by <OT> if thetest point was out of tolerance (definition ofout of tolerance is Set point – RPM4-E-DWT
reading > DUT tolerance).

5.

Number of this test point over total number ofpoints in the AutoTest.

© 2009 DH Instruments, a Fluke Company

Page 540.00 psig
View datahzHi
FA 1/10

3. OPERATION

Press [ENT] to move to the next data point. Press [←] or [→] to scroll backward
and forward through the test points. The data file header is between the firstpoint and the last point.
Press [ESC] to exit the data file. Confirmation is required to exit the data viewfunction.

Note
Up to ten data files are buffered, ten at a time, in RPM4-E-DWT
memory. When a new AutoTest run is completed, its data filegoes to front of the queue and the oldest data file is deleted.

3.8.5.2

FILE PURPOSE
To view and edit File AutoTest definition files.
 PRINCIPLE
RPM4-E-DWT supports AutoTests (see Section 3.7.11,  PRINCIPLE).
There are two types of AutoTests:•

Quick AutoTests in which the DUT and test parameters are entered“on the fly” during the initialization of the test.

•

File AutoTests in which the DUT and test parameters are stored in afile and retrieved when the file is selected to run an AutoTest.

File AutoTest parameters are stored in definition files. [SETUP], <5AutoTest>,<2file> allows File AutoTest definition files to be viewed and edited. Up to 40
File AutoTest definition files with up to 21 test points in each file can be created.
A File AutoTest definition file defines:•

The identifying number of the File AutoTest definition file.

•

Pressure unit of measure.

•

DUT full scale in pressure unit of measure and measurement mode.

•

DUT tolerance (% FS).

•

Number of test points or pressure targets to include in the
AutoTest.

•

Numerical value of each test point or pressure target.

See Section 3.7.11,  OPERATION for information on running a Quick or File
AutoTest.
See Section 3.8.5.1 for information on viewing the data files that result fromrunning a Sequence.
 OPERATION

Note
See Section 3.7.11, OPERATION, for information on RUNNING a
Quick or File AutoTest.
To access the AutoTest definition viewing and editing functions press [SETUP],<5ATest>, <2file>. Select <1view> to view an AutoTest definition file. Select<2edit> to edit an AutoTest definition file.
When <2edit> is selected the display is:Page 55

Edit File AutoTest #1© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUALEnter the number (1 - 40) of the File AutoTest to be edited.

Note
To create a File AutoTest definition file similar to an existing
definition file without entering all the definition information, edit
an existing definition file and at the end of the editing process,save it as a different file number.
1psi 2MPa 3kPa
4bar

The display is:

The unit of measure selection screen is the current [UNIT] selection screen (seeSection 3.7.3). Select the desired pressure measurement unit for the AutoTest.
DUT full scale:6000 psi g
File1

The display is:Enter the full scale pressure of the DUT to be calibrated with this File AutoTest.
The value entered will be used along with the DUT tolerance to AutoRange
RPM4-E-DWT settings when the File AutoTest is run (see Section 3.7.5,
 PRINCIPLE).
DUT tolerance:
0.25% FS
File1

The display is:Enter the tolerance in % of full scale (measurement uncertainty, precision or
accuracy as desired) of the DUT to be calibrated using this File AutoTest. The
value entered will be used along with the DUT full scale to determine
RPM4-E-DWT AutoRange settings when the AutoTest is run (see Section 3.7.11,
 PRINCIPLE).
The display is:

Number of targets:
1
File1

Enter the total number of pressure points or target pressures to be included in
the AutoTest. The maximum number of points is 21. If data is to be taken at“zero” pressure, include the “zero” points in the point count.
Pressure target N:
0.0 psi g
File1

The display is:Enter the numerical value of the target pressure point <N>. Repeat until all of thepoints in the File AutoTest have been defined.
Pressure target N:
0.00 psi g
File1

The display is:Enter the identifying number under which this File AutoTest definition file is to be
saved. A confirmation is required to overwrite and existing sequence.
While editing a File AutoTest, pressing [ESC] backs through entries until editingof the pressure target values has begun. Then [ESC] can only be used toabandon editing.

3.9[SPECIAL] PURPOSE[SPECIAL] accesses a menu of RPM4-E-DWT functions and features that are less commonly used or not
normally used in regular operation.

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Page 56

3. OPERATION

 OPERATION
Press [SPECIAL] from the MAIN RUN screen to access the
SPECIAL menu. The display is:

1AutoZ 2remote 3head
4SDS 5prefs 6Punit
7intern 8cal 9reset

Note
Some screens, such as the SPECIAL menu, go beyond the two lines provided by
the display. This is indicated by a flashing arrow in the second line of the display.
Press the cursor control keys to move the cursor to access the lines that are notvisible or directly enter the number of the hidden menu choice if you know it.
SPECIAL menu choices include:<1AutoZ><2remote><3head><4SDS><5prefs><6Punit><7intern><8cal><9reset>Manage the AutoZero function for the active Q-RPT (see Section 3.9.1).
View and edit COM port (RS-232) and IEEE-488 interface settings. Select remote syntax
style (see Section 3.9.2).
Set HEAD function fluid and height unit of measure (see Section 3.9.3).
Feature not used in this RPM4-E-DWT model.
View and set screen saver time, keypad sound frequency, unit ID number, time/date,security protection level (see Section 3.9.5).
Customize the [UNIT] key pressure unit of measure selections (See section 3.9.6).
View internal barometer, view and set pressure reading rate setting, view incident log(see Section 3.9.7).
View and adjust RPM4-E-DWT Q-RPT and barometer calibration coefficients (seeSections 3.9.8, 5.2.2).
Access RPM4-E-DWT’s various reset functions (see Section 3.9.9).

3.9.1<1AUTOZ>

 PURPOSE
To turn ON and OFF the AutoZ function that allows the Q-RPT reading to be zeroed and the
dynamic compensation for atmospheric pressure changes feature. Also, view and adjust thevalue of the AutoZ offset.

Note
To RUN the AutoZ routine that zeroes the Q-RPT, use [AutoZ] (see Section
3.7.10).
 PRINCIPLE
AutoZ Purpose and Principle
The RPM4-E-DWT AutoZero function (AutoZ) is used to achieve gauge measurement modewith the RPM4-E-DWT’s intrinsically absolute Q-RPTs and to eliminate the influence of zerodrift on measurement uncertainty. AutoZ can also tare out fluid heads between the E-DWT-H
and the device under test.
The AutoZ functions provides full on-board support for regular zeroing including
determination, application and storage of offset values as well as dynamic compensation forchanges in atmospheric pressure between zeroing opportunities. The operator initiates
Q-RPT zeroing by pressing the [AutoZ] key from the main run screen when zero
(atmospheric pressure) is applied to the RPM4-E-DWT Q-RPT.
The AutoZero function uses four values:
1. Pstd,0: Zero (atmospheric pressure) which is supplied by definition when the Q-RPT is
active, the reservoir shut off valve is close, the TEST shut off valve is open and the TEST
port is disconnected and filled with oil to the weep hole (reference level).

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

2. Pu,0:The absolute pressure reading of the Q-RPT, with no AutoZ offset, at the time
[AutoZ] is pressed.
3. Poffset,G: The difference between the reading of the Q-RPT with no AutoZ offset when
[AutoZ] is pressed (Pu,0), and zero gauge pressure (atmospheric gauge pressure) (Pstd,0):Poffset,G = Pu,0 - Pstd,0
4. ΔPatm: The difference between atmospheric pressure (absolute) as measured by the
RPM4-E-DWT’s on-board barometer when [AutoZ] was last pressed and the current
measured value. ΔPatm is used to compensate real time for the evolution of atmosphericpressure between updates of Poffset,G by [AutoZ]. ΔPatm is dependent only upon the ability ofthe barometer to measure small changes in atmospheric pressure over short time periods,
not upon the barometer’s absolute accuracy or long term stability.
The gauge pressure measured by the RPM4-E-DWT Q-RPT at any given moment is:
Pgauge = Pu - Poffset.G - ΔPatm
The AutoZ function can be turned ON and OFF. When the AutoZ function is OFF, the[AutoZ] function to rezero the RPT is no longer available and dynamic compensation forchanges in atmospheric pressure using the RPM4-E-DWT’s on-board barometer is no longer
active. AutoZ should be left on at all times unless the RPM4-E-DWT’s on-board barometer isinoperable.
 OPERATIONNote•

The AutoZ function and values are Q-RPT specific.

•

To RUN the AutoZ routine that rezeroes the Q-RPT, use [AutoZ] (seeSection 3.7.10).

To access the RPM4-E-DWT AutoZ function press [SPECIAL], <1AutoZ>. The display is:1.

Active Q-RPT designator.

2.

Indication of active measurement mode (always <gage> forgauge in this RPM4-E-DWT model)

3.

Indication of whether AutoZ is currently ON or OFF for thisQ-RPT.

1off 2view
3edit

Hi
gage ON

Select <1off> (or <1on>) to change the AutoZ status for the current Q-RPT andmeasurement mode from ON to OFF or vice versa.

Note
AutoZ ON is indicated by a <z> in the MAIN RUN screen, top line, third
character from the right. When AutoZ is OFF, the character is blank.
AutoZ should always be left ON in RPM4-E-DWT unless the on-board
barometer becomes inoperable.
Select <2view> to view the current value of Poffset for the active Q-RPT.

Note
The value of Poffset is always displayed and entered in Pascal (Pa). Poffset
should be roughly equal to atmospheric pressure.
Select <3edit> to edit the value of Poffset for the active Q-RPT and measurement mode.
Edit Poffset as desired and press [ENT] to activate the new value. Press [ESC] to abandonchanges.

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3. OPERATION

Note
There is no reason to edit Poffset during normal RPM4-E-DWT operation or
maintenance. Poffset should only be adjusted using [AutoZ] (see Section
3.7.10).

3.9.2<2REMOTE> PURPOSE
To configure the RPM4-E-DWT COM1 and COM2 communication ports. To test COM1 andCOM2 communications. To select the remote programming communications format.
 PRINCIPLEThe RPM4-E-DWT has two RS-232 communications ports referred to as COM1 and COM2.
COM1 is for communicating with a host computer (see Section 4), and COM2 is reserved forcommunicating with an external device (e.g. an RPM4-E-DWTx, a multimeter, etc.). The
ports’ settings can be viewed and changed using [SPECIAL], <2remote>.
RPM4-E-DWT has two remote communications formats, classic and enhanced (see Section
4.3). The active format can be selected.
A self test is supplied for RS-232 communications. The self test allows verification that the
RPM4-E-DWT RS232 ports (COM1 and COM2) are operating properly and that a validinterface cable is being used.
 OPERATION
To access the communications settings, press [SPECIAL], <2Remote>.
•

Select <1COM1> to view and edit COM1 settings (see Section 3.9.2.1).

•

Select <2COM2> to view and edit COM2 settings (see Section 3.9.2.1.).

•

Select <4format> to select the remote communications command format (see Section
3.9.2.3).

•

Select <5RS232test> to run the COM1 and COM2 communications test (see Section
3.9.2.4).

3.9.2.1<1COM1, 2COM2>

The COMx ports can be set for specific communications settings. The settings
are baud rate, parity, data bits and stop bits. The available options are:Baud

300, 600, 1 200, 2 400, 4 800, 9 600, 19 200, 28 800, 38 400

ParityNONE, ODD or EVEN

Length7 or 8Stop Bit 1 or 2
The default is <2 400, E, 7,1> for both COM1 and COM2.
The user can also specify one or two termination characters, referred to as“Term1” and “Term2”, as well as define these characters. These define thecharacters that mark the end of commands that are sent to the RPM4-E-DWT as
well as mark the end of replies sent back to the host computer. The
RPM4-E-DWT typically uses the <Term1> character to mark the end, and will
ignore the <Term2> character. The characters can be any decimal number from
1 to 255. The defaults are <13> (carriage return) and <10> (line feed) andusually should not be changed.

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3.9.2.2<3IEEE-488>

An IEEE-488 interface is not included in the E-DWT-H A70M/A7M-AF model.

3.9.2.3<4FORMAT>The RPM4-E-DWT has two different syntax formats available for the remote
program commands.
The classic remote command format is highly intuitive and conforms withprevious DHI PPC and RPM4 products.
The enhanced remote command format generally uses the same commands as
the classic format, but in addition it follows the syntax, format, and status
reporting features of IEEE Std 488.2.
The details of each format are covered in Section 4.3.
[SPECIAL], <2remote>, <4format> allows the remote program command syntax
to be selected. The cursor is on the active format. Select <1classic> or<2enhanced> as desired.

3.9.2.4<5RS232 SELF-TEST>The RS232 self-test is provided to check the RPM4-E-DWT COM ports and theinterface cable independently of an external device or computer.
If you are having difficulty communicating with RPM4-E-DWT from a hostcomputer using RS232, the RS232 self test can help establish that the
RPM4-E-DWT COM1 port you are trying to communicate with and the interface
cable you are using are good.
To run a self test of the RS232 ports (COM1 and COM2), press [SPECIAL],<2remote>, <5RS232test>.
The display prompts you to connect COM1 to COM2 using a standard pin-to-pin
DB-9F to DB-9M RS232 cable.
Once the cable has been installed, press [ENT] to run the self-test. The test is
first executed in the COM1→COM2 direction and then in the COM2→COM1
direction.
If the COM1→COM2 test passes: <PASSED> displays briefly and the test
proceeds to COM2→COM1.
If COM2→COM1 passes: <PASSED> is displayed briefly followed by theconclusion, <The RS232 test has PASSED>.
If a test fails:

Execution is suspended until [ENT] is pressed.

Note
The RPM4-E-DWT RS232 test can fail for three reasons:
The RS232 cable being used is incorrect (Section 4.2.1.1,
4.2.1.2) for information on the correct cable).
COM1 and COM2 do NOT have the same serial communications
settings and therefore cannot communicate together (seeSection 3.9.2.1 to set the COM ports).
COM1 or COM2 is defective.
The reason for failed communications is almost always a cableor incorrect RS232 interface settings. Be sure that these arecorrect before concluding that a COM port is defective.

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3. OPERATION

3.9.3<3HEAD> PURPOSE
To view or change the properties of the HEAD function (see Section 3.7.8) including the unit ofmeasure of length for head height entry and the test fluid type and species for density
calculations.
 OPERATION
From the MAIN RUN screen, press [SPECIAL], <3Head>.
Select the desired height unit of measure and press [ENT].
Select <1gas> or <2liqud> depending on the pressurized medium between the
RPM4-E-DWT and the height at which pressure is to be calculated. Select the gas or liquid
species. The liquid selection <3User>, is to create a custom liquid with a user entereddensity.
Use [HEAD] to set a head height if desired.

3.9.4<4SDS>

 PURPOSE
This feature is not used in RPM4-E-DWT A70M/A7M-AF.

3.9.5<5prefs>

 PURPOSE
To access a menu of RPM4-E-DWT operational preferences and functions.
 OPERATION
To access the PREFS menu press [SPECIAL],<5prefs>. The display is:

1ScrSvr 2sound 3time
4ID 5level

The PREFS menu includes:<1ScrSvr> View and change the screen saver activation time (see Section 3.9.5.1).
<2sound> View and change the key press sounds (see Section 3.9.5.2).
<3time>View and edit the internal time and date settings (see Section 3.9.5.3).

<4ID>

View the RPM4-E-DWT serial number (SN) and view or edit the ID number(see Section 3.9.5.4).

<4level>View and set the user security level and/or password (see Section 3.9.5.5).

3.9.5.1<1SCRSVR>

 PURPOSE
To adjust the idle time after which RPM4-E-DWT’s SCREEN SAVER activates.
 PRINCIPLE
RPM4-E-DWT has a SCREEN SAVER function which causes the display to dim
after a front panel key is NOT pressed for a certain amount of time. The default isfor the screen saver to activate after 10 idle minutes. The screen saver activation
time can be adjusted by the user or screen saving can be completely eliminated.

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

Note
Setting screen saver time to zero eliminates the SCREEN
SAVER function so that the display permanently remains at fullbrightness.
 OPERATION
To access the SCREEN SAVER function, press [SPECIAL], <5prefs>,<1ScrSav>. Edit, in minutes, the idle time after which screen saver will activate
to dim the screen. Set the time to zero to eliminate the SCREEN SAVER function.

3.9.5.2<2SOUND>

 PURPOSE
To adjust or suppress the RPM4-E-DWT valid key press sound.

Note
See Section 3.6.4 for information on the complete list of sounds
made by RPM4-E-DWT and their meanings.
 PRINCIPLE
RPM4-E-DWT provides audible feedback by a brief “beep” when a valid key
press is made. The tone frequency of this beep may be selected from threechoices or it may be completely suppressed. Invalid key presses are indicated bya descending two tone “blurp” which cannot be suppressed.
 OPERATION
To access the keypad sound adjustment function press [SPECIAL], <5prefs>,<2sound>.
Select between <2lo>, <3mid> or <4hi> to adjust the valid key press tone
frequency.
Select <1none> to suppress the valid key press tone.

Note
The sound function only affects the valid key press tone. The
invalid key press tone and other RPM4-E-DWT sounds cannot
be adjusted or suppressed.

3.9.5.3<3time> PURPOSE
To view and edit the RPM4-E-DWT internal time and date settings.
 OPERATION
To
accessthe
TIME
functionpress [SPECIAL], <5prefs>, <3time>.
The display is:

Edit: 1time 2date
08:32:11 am 20080125

Select <1time> to edit the time. Edit hours, then minutes, then am/pm bypressing [ENT] after each entry. Seconds go to zero when minutes are entered.
This can be used to synchronize the time with a time standard.
Select <2date> to edit the date. The date must be specified in YYYYMMDD
format.

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3. OPERATIONNote
The RPM4-E-DWT date and time are set to United States
Mountain Standard Time in the final test and inspection process
at the factory. If desired, use the TIME and DATE function to set
your local time and date.

3.9.5.4<4id> PURPOSE
To view or edit the RPM4-E-DWT user ID and to view the RPM4-E-DWT serial
number.
 OPERATION
To access the ID function press [SPECIAL], <5prefs>, <4ID>.
Select <1view> to view the current ID.
Select <2edit> to edit the ID.
The ID has twelve characters. When the edit screen is opened, the cursor is on
the first character. Numerical values can be entered directly from the keypad. In
addition, the cursor control keys can be used to toggle through a list of available
alphanumeric characters. Holding the key slews through the characters.
Character order going up is: blank space, symbols, lower case letters, upper
case letters, and numbers. After selecting a character, press [ENT] to activate it
and move to the next character field.
When a character is selected the cursor moves to the next character. To leave a
blank character, press [ENT] with the field for that character blank. Use this forthe trailing characters if the ID being entered is less than twelve characters.
After the last of the twelve characters has been entered, the <Save ID?> option
is offered. Select <1no> to return to the ID edit screen. Select <2yes> to save theedited ID.

Note
The ID can be set remotely from a computer which is quite a bit
more convenient than entering characters from the keyboard(see Section 4.4.4, “ID” command). The ID is not cleared or
reset by any RESET function (see Section 3.9.9).

3.9.5.5<5LEVEL> (Security) PURPOSE
To set user protection levels to restrict access to certain functions and to edit the
password required for changing user levels.
 PRINCIPLE
RPM4-E-DWT’s front panel user interface provides the means to access all
RPM4-E-DWT user defined data, settings and functions including calibration data.
Inadvertent, uninformed or unauthorized altering or deleting of data, settings andfunctions could require extensive reconfiguration by the user and might cause invalid
readings and behavior. For these reasons, depending upon the application in which
RPM4-E-DWT is being used, it may be desirable to restrict access to somefunctions. The user level function provides a means of restricting access to certain
functions. Four different levels of security are available.
Access to changing security levels can be left open, or be protected by apassword.

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

Security Levels
The security levels are structured to support typical operating environments asfollows:
None

This level is intended for use only by the system manager and/or
calibration facility. It allows access and editing in all areas including
critical metrological information.

Low

Low security is designed to protect the specific metrologicalinformation and SYSTEM DIAGNOSTIC AND MAINTENANCE
functions of the system against accidental alteration. It is intended for anadvanced operator performing many different tasks. Low security is
the default user level setting.

Medium Medium security is designed to protect specific metrologicalinformation in the system and to assure that the RPM4-E-DWT is
operated using consistent operational parameters.
High

High security is designed to protect all operating parameters. It is
intended to minimize operator choices, for example to perform
repeated identical calibrations under consistent conditions.

Note
RPM4-E-DWT is delivered with the security level set at low to
avoid inadvertent altering of critical internal settings but withaccess to changing security levels unrestricted.
It isrecommended that the low security level be maintained at all
times. If there is a risk of unauthorized changing of the security
level, changing authority should be password protected (see 
OPERATION of this section).
The security levels are structured to support typical levels of operation as shownin Table 6. Specifically, the security levels prevent execution of the functions
accessed by the key strokes marked by “•”:
Table 6. Security levels
FUNCTIONLOWMEDIUM[RANGE][ENT] (AutoTest)[UNIT][MODE]•[AutoRange][LEAK CK]•[DISPLAY][HEAD]

HIGH

•
•
•
•
•
•
•
•

[SDS] (NOT USED IN THIS RPM4-E-DWT MODEL)•[AutoZ] (in absolute mode)[SETUP]••••[SETUP], <1range>[SETUP], <2res>[SETUP], <4UL>[SETUP], <5ATest>[SPECIAL][SPECIAL], <1AutoZ>[SPECIAL], <1AutoZ>, <1on/1off>[SPECIAL], <1AutoZ>, <3edit>

•
•

•
•
•

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•

•
•
•
•
•
•
•
•
•
•
•
•

3. OPERATION[SPECIAL], <3head>••[SPECIAL], <4SDS> (NOT USED IN THIS RPM4-E-DWT
MODEL)[SPECIAL], <5pref>, <1ScrSvr>

•

•

•
•
•
•
•
•
•
•
•
•
•
•
•
•

•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

[SPECIAL], <5pref>, <2sound>[SPECIAL], <5pref>, <3time>••[SPECIAL], <5pref>, <3time>, make changes
SPECIAL], <5pref>, <4ID>, <2edit>[SPECIAL], <6Punit>[SPECIAL], <7intern>••[SPECIAL], <7intern>, <3RPT2x> (NOT USED))[SPECIAL], <7interrn>, <5log>, clear log[SPECIAL], <8cal>•[SPECIAL], <8cal>, <2edit> under any selection[SPECIAL], <4reset>••[SPECIAL], <4reset>, <4cal>[SPECIAL], <4reset>, <5all>
Remote communications disabled“•” indicates the function/menu is NOT accessible.

 OPERATION
RPM4-E-DWT is delivered with no active password and access to the User Levelmenu is open. The user level is set to <1Low>. User levels can be changed
freely until a password has been created.
To
accessthe
LEVEL
functionpress [SPECIAL], <5prefs>, <5level>.
The display is:

1change user level2edit password

Selecting <1change user level> brings
up the restriction menu:

Restrictions: 1none
2low 3medium 4high

The cursor is on the current restriction level.
or [ESC] back to the MAIN RUN screen.
If no password is active, selecting<2edit password> displays the user
password and allows it to be edited.

Select a different level or

Password: pppppp
0 disables password

Note
Once a password has been entered, the user level cannot bechanged without reentering the password.
Passwords can be up to six numbers in length and cannot start with a zero.
If <0> is entered, the password is made inactive and the user will not be required
to enter a password to access the user level menu. This condition, with asecurity level of <2low>, is the factory default.
If there is an active password, theRPM4-E-DWT password entry screen
appears. The user must enter the user
defined password or the factory
secondary password to proceed further:

RPM4-E-DWT SNnnnnxx
Password: pppppp

The first field, <nnnn>, is the serial number of the RPM4-E-DWT, followed by asecond field, <xx>, that represents the number of times that a secondary
password has been used. The second field, <xx>, increments each time asecondary password is used. The third field, <pppppp> is for user entry of thenormal password.
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E-DWT-H OPERATION AND MAINTENANCE MANUALNote
The factory secondary password is available in case the user’s
password has been misplaced or forgotten. It can be obtainedby contacting a DHI Authorized Service Center (see Table 19).
The factory secondary password is different for all
RPM4-E-DWT’s and changes each time it is used.

3.9.6<6PUNIT> PURPOSE
To customize the selection of pressure units of measure available in the [UNIT] key menu.
 PRINCIPLE
The [UNIT] function key makes available a choice of four default pressure units (psi, MPa,kPa, bar) (see Section 3.7.3). RPM4-E-DWT also supports many commonly used units otherthan those included in the default set up. These units can be made available for active
selection by customizing the UNIT function using [SPECIAL], <6Punit>. This allows
RPM4-E-DWT to offer a very wide selection of units while simplifying day to day operation.
The typical user customizes the [UNIT] function key to support his/her most commonly usedunits. Up to six units can be included in the [UNIT] screen.
 OPERATION
To customize the [UNIT] function key, press [SPECIAL], <6Punit> from the MAIN RUN
screen. The display is:1.

Entry field to specify which unit position (1 to 6) of the [UNIT]
function key menu is to be changed.

Set up unit #5

Unit#5 1SI 2other3altitude 4user

Enter the number of the unit position that you would
like to change. The display becomes:

Select the desired pressure unit category (SI units include units based on SI units such asmmHg), then select the desired unit from the unit menu. <3altitude> is not available in thisRPM4-E-DWT model.
The units of measure available are listed in Table 7.
Table 7. UNIT function - available units of measure<1SI><2OTHER><3ALTITUDE><1Pa><2hPa><3kPa><4MPa><5mbar><6bar><7mmHg><8mmWa><1psi><2psf><3inHg><4inWa><5kcm2>

Not available
in thisRPM4-E-DWT
model<4USER>If <4user> is selected, the user unit must be defined. The display is:1.

Define user unit:
1.000000 unit/Pa

Entry field.

Enter the number of user units per Pascal (Pa) in the entry field. Pressing [ENT] defines theuser unit and returns to the <Set up unit #n> screen.
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3. OPERATIONNote•

The user defined unit label can be customized to any alphanumeric, fourcharacter label using the remote command “UDU” (see Section 4.4).

•

See Section 7.1.1 for the pressure unit conversion factors used by
RPM4-E-DWT.

3.9.7<7INTERN> PURPOSE
To view, set, adjust, and maintain various aspects of RPM4-E-DWT’s internal operation.
 OPERATION
To access the internal selections press [SPECIAL],<7intern>. The display is:

1baro 2ReadRt 3RPT2x
4lo vnt 5log

The INTERNAL menu choices include:<1baro>3.9.7.1).

View the real time output of the RPM4-E-DWT on-board barometer (see Section<2ReadRt> Turn ON and OFF RPM4-E-DWT’s automated, rate of change dependent,
reading and integration and display rate feature (see Section 3.9.7.2).
<3RPT2x> Feature not used in this RPM4-E-DWT model.
<4lo vnt>

Feature not used in this RPM4-E-DWT model.

<5log>

View the RPM4-E-DWT incident log (see Section 3.9.7.5).

3.9.7.1<1BARO> PURPOSE
To view the value of atmospheric pressure as measured by the RPM4-E-DWT
on-board barometer.
 PRINCIPLE
RPM4-E-DWT A70M/A7M-AF is equipped with an on-board barometer. The
atmospheric pressure measurements made by the on-board barometer are used
for dynamic compensation of atmospheric pressure when making gauge pressure
measurements (see Sections 3.9.1).

Note•

See Section 5.4.4 Figure 15 and Section 5.4.4.3, Figure
16 for a photo and schematics showing the position of
the on-board barometer in RPM4-E-DWT.

•

The on-board barometer is a low accuracy sensor used
only for measuring small changes in atmosphericpressure over short periods of time (see Section 3.9.1).
RPM4-E-DWT measurement uncertainty does notdepend on the measurement uncertainty of the on-board
barometer.

 OPERATION
To view the current reading of the on-board barometer press [SPECIAL],<7intern>, <1baro>. The display is in the active pressure unit of measure(see Section 3.7.3). The display resolution is fixed to 0.1 Pa, or its equivalent.

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3.9.7.2<2READRT> PURPOSE
To turn ON and OFF RPM4-E-DWT’s automated, rate of change dependent,
reading integration and display rate feature.
 PRINCIPLE
To obtain maximum resolution from RPM4-E-DWT Q-RPT pressure
measurements, an integration time of about 1.2 second per reading is used. In
most situations, maximum precision is needed when pressures are stable so a
relatively slow display update rate presents no disadvantage. However, whenpressure is changing quickly, more rapid pressure updates are usually more
important than obtaining maximum precision on individual readings. The
RPM4-E-DWT read rate function automatically adjusts pressure measurement
integration time depending on the rate of change of pressure. When pressure ischanging rapidly, reading rate is increased. When pressure is evolving slowly,
reading rate is decreased and maximum precision is obtained.
When the automated read rate function is ON, three pressure rate of change
dependent read rates are used. The result is three display update rates:
Table 8. READRT – display update rates
PRESSURE
RATE OF CHANGEDISPLAYUPDATE> 3 % of range span/s≈ 0.2 s> 0.5 and < 3 % of range span/s≈ 0.6 s< 0.5 % of range span/s≈ 1.2 sFor situations in which maximum reading precision is desired regardless ofpressure rate of change, the RPM4-E-DWT automated read rate function can beturned OFF.
In this case, the reading rate is always the high resolution rate of about 1.2
readings per second.
 OPERATION
To turn the automated read rate function ON or OFF or check its current status,press [SPECIAL], <7intern>, <2ReadRt>.
Auto read rate:
1on 2off

The display is:
The cursor is on the current selection.

Selecting <1on> activates the automated reading rate and returns to the MAIN
RUN screen. Selecting <2off> turns OFF the automated reading rate andreturns to the MAIN RUN screen.
The default RPM4-E-DWT condition is auto read rate ON.

Note
Auto read rate ON/OFF is NOT Q-RPT or range specific. Turning
auto read rate ON or OFF in one range turns it ON or OFF for all
RPM4-E-DWT ranges.

3.9.7.3<3RPT2X>

 PURPOSE
This feature is not used in this RPM4-E-DWT model.
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3. OPERATION

3.9.7.4<4LO VNT> PURPOSE
This feature is not used in this RPM4-E-DWT model.

3.9.7.5<5log>

 PURPOSE
To view and/or clear the RPM4-E-DWT event log.
 PRINCIPLE
RPM4-E-DWT records to a log each time one of the following events occurs:•

Pmax! of an internal RPM4-E-DWT Q-RPT is exceeded (see Section
3.8.4.1).

•

A memory fault occurs.

 OPERATION
To view the event log press [SPECIAL], <7intern>, <5log>. The oldest logged
event appears. Pressing the left or right arrow keys, [<] or [>], steps through thelogged events from the oldest to the most recent and ending with the option toclear the log, <1no>, <2yes>. The log clear choice is not available in all security
levels (see Section 3.9.5.5, Table 6). Pressing the down arrow key displays thenumber of the event and the date and time the event occurred.
When all events have been viewed, <End of log> displays.

3.9.8<8CAL>

 PURPOSE
To calibrate the RPM4-E-DWT Hi and Lo Q-RPTs and adjust the on-board barometer. These
functions are considered part of RPM4-E-DWT maintenance and are covered in themaintenance section of this manual (see Sections 5.3, 5.2.2).

3.9.9<9RESET> PURPOSE
To reset various RPM4-E-DWT settings to default or factory values.
 PRINCIPLE
RPM4-E-DWT stores its user definable settings in non-volatile memory. The reset menu
allows the user to selectively or completely reset these settings to factory defaults. This
clears any settings that the user has made, and should be used only to restore the
RPM4-E-DWT to a known state. RPM4-E-DWT goes through its power up sequence after
any type of reset is executed.

Note
RPM4-E-DWT reset functions will change current settings to factory
defaults. These may include settings vital to RPM4-E-DWT operation andaffecting the calibration of the reference pressure transducers (RPTs).
Reset functions should only be used by qualified personnel withknowledge of reset consequences. Reset functions should never be used
“experimentally”.

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E-DWT-H OPERATION AND MAINTENANCE MANUAL OPERATION
To access the RESET menu, press [SPECIAL],<9reset>. The display is:

1sets 2units 3ATest
4cal 5all

RESET menu choices include:<1sets>to reset general system operating parameters (see Section 3.9.9.1).

<2units>

to reset unit of measure functions (see Section 3.9.9.2).

<3ATest> to reset AutoTest parameters, clear File AutoTest files and clear the AutoTest
data log (see Section 3.9.9.3).
<4cal>

to reset internal calibration coefficients and modes (see Section 3.9.9.4).

<5all>

to reset all settings except ID and security password to factory default values(see Section 3.9.9.5).

3.9.9.1<1SETS> PURPOSE
Sets most general operating parameters back to default values. Does not affectcalibration coefficients, remote interfaces or AutoRange ranges. The Reset – Sets
resets are itemized in Table 9.
Table 9. Reset – SetsRESET

RESULT

SEE SECTION[UNIT]

Pressure unit of measure to first of the six available

3.7.3[RANGE]

Hi Q-RPT default range

3.7.2[HEAD]

0 in height and Oil medium

Stability Limit

0.01 % of Hi Q-RPT default range/second

3.8.3

Upper Limit

Hi Q-RPT default range default value

3.8.4

Resolution

0.01 % FS of Hi Q-RPT default range

3.8.2

AutoZ

AutoZ ON for all Q-RPTs, Zoffset value not affected

3.9.1

AutoZ

Patm,0 set to 101.325 kPa a

3.9.1

Leak Check

15 second run time. Clear logged results

3.7.6

Screen Saver

10 minutes to activation

3.9.5.1

Key Sounds

Medium tone valid key press sound

3.9.5.2

Lo VntAutomatic

None

ReadRate

Automatic

3.9.7.2

3.9.9.2<2 Units>

3.7.8, 3.9.3

 PURPOSE
Sets the pressure units available under the UNIT function to default selections
depending (see Section 3.7.3).
Sets the user defined unit to 1.000/Pa (see Section 3.9.6).
Sets the reference temperature for inWa unit to 20°C.

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3. OPERATION

3.9.9.3<3ATEST>

 PURPOSE•

Resets Auto Tests to default values (see Section 3.7.11).

•

Clears File AutoTest definition files (see Section 3.8.5.2).

•

Clears AutoTest results data logs (see Section 3.8.5.1).

3.9.9.4<4 Cal> PURPOSE

Note
The Reset - Cal function will reset the Q-RPT and barometer
calibration coefficients and reset AutoZ values to zero. This willchange the RPM4-E-DWT calibration and could cause it to makeout of tolerance measurements.
Clears all user values affecting the calibration of Q-RPTs and the on-board
barometer. The Reset – Cal resets are itemized in Table 10.
Table 10. Reset – CalRESETRESULT

SEE SECTION

All Q-RPT calibration
coefficients

PA to zero, PM to 1

5.3.1.1

On-board barometer
calibration coefficients

PA to zero, PM to 1

5.2.2

Calibration date

Set all dates to 19800101

AutoZ value

101325 Pa

5.3.7, 5.2.2
3.9.1

Gxxx, BGxxx Q-RPTs: All Poffset values to zero
AutoZ function

3.9.9.5

ON, all Q-RPTs

3.9.1<5 All> PURPOSE

Note
The reset - all function clears and deletes large amounts of user
defined information including critical calibration data.
Combines all resets in one global reset command that clears the entire user
section of non-volatile memory except the ID function (see Section 3.9.5.4) andthe security level password (see Section 3.9.5.5) returning RPM4-E-DWT to the“as delivered” condition. The Reset – All resets are itemized in Table 11.
Table 11. Reset – AllRESETRESULT

SEE SECTION

Reset – Sets

All the resets of Reset - Sets

3.9.9.1

Reset – Units

All the resets of Reset - Units

3.9.9.2

Reset – Atest

All the resets of Reset - ATest

3.9.9.3

Reset – Cal

All the resets of Reset - Cal

3.9.9.4

Remote Interfaces

COM1, COM2 interfaces to default settings.

3.9.2

Remote Communications

Remote command format to Classic

3.9.2.3

Level (Security)

Reset security level to low

3.9.5.5

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Notes© 2009 DH Instruments, a Fluke Company

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4. REMOTE OPERATION

4.

Remote Operation

4.1

Overview

Most of the RPM4-E-DWT front panel functions can also be executed by commands from a remotecomputer. The host computer can communicate with the RPM4-E-DWT using the RPM4-E-DWT’s COM1
RS232 port.
Before writing code using RPM4-E-DWT remote commands, familiarize yourself with its operating
principles by reviewing Section 3 of this manual.

4.2

Interfacing

Sending a program message to the RPM4-E-DWT places it into remote mode. The remote indicator to
the right of the display window lights when the RPM4-E-DWT is in remote mode. It also flickers when aprogram message is received. The menus usually accessed from the front panel are locked out while inremote. The [ESC] key returns the RPM4-E-DWT to local operation unless the <REMOTE> program
message, which locks out all keypad operation, was sent to the unit.

4.2.1

RS232 Interface
4.2.1.1

COM1

The RPM4-E-DWT COM1 RS232 interface is located on the back of the unit. It is a
9-pin male DB-9F connector configured as a DCE device. Data is transmitted out of
the unit using pin 2, and is received on pin 3. This allows a normal pin-to-pin DB-9M
to DB-9F RS232 cable to be used to connect to a DTE host.
Handshaking is not required or supported. The COM1 receive buffer is
80 bytes deep. If you overflow the buffer by sending too much data, the data will
be lost. Because of this, you must send a single program message at a timeand you must wait for the RPM4-E-DWT to reply from the previous command
before issuing another command.
Table 12. COM1 pin designations and connections
RPM4-E-DWT COM1 DB-9F PIN DESIGNATIONSPIN #FUNCTIONDESCRIPTION

2TxDThis pin transmits serial data from the RPM4-E-DWT to the
host.

3
5

RxD
Grn

This pin accepts serial data from the host computer.
This pin is the common return for the TxD and RxD signals.

IBM PC/XT DB-9F
CONNECTIONSIBM PC/XT DB-9M TO RPM4-E-DWT
DB9F CONNECTION

DB-25M

DB-9F

DB-9M

2

3

3

3

3
7

2
5

2
5

2
5

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4.2.1.2

COM2

The RPM4-E-DWT COM2 RS232 interface is located on the back of the unit. It
can be used to allow the host computer to communicate with another device
through the RPM4-E-DWT. This allows the user to use one host COM port tocommunicate with the RPM4-E-DWT and an additional RS232 device. Refer tothe “#” remote program command for details.
COM2 is a 9-pin female DB-9F connector configured as a DTE device. Data istransmitted out of the RPM4-E-DWT using pin 3, and is received on pin 2. This allows anormal pin-to-pin DB-9M to DB-9F RS232 cable to be used to connect to a DCE
device.
Handshaking is not required or supported.
Table 13. COM2 DB-9F pin designations

4.3

PIN #

FUNCTIONDESCRIPTION

2RxD

This pin transmits serial data from the RPM4-E-DWT to a
device.

3

TxD

This pin accepts serial data from the external device.

4

DTR

This pin is Data Terminal Ready (DTR) (held at + 5 V).

5Grn

This pin is the common return for the TxD and RxD signals.

Programming Formats

RPM4-E-DWT supports two program message formats, the “classic”, and the “enhanced” formats. The
user must select which format to use. Selection can be accomplished from the front panel (see Section
3.9.2.3) or remotely using the “L2” or “L3” program message (see Section 4.4.4). The ”MSGFMT”
command can also be used to select the format, but is not recommended for new designs.
The main difference between the “classic” and “enhanced” formats is that commands that reply a Boolean type
reply a ‘0’ or ‘1’ when in enhanced mode. Classic mode includes the original command in the reply.
Many RPM4-E-DWT classic and enhanced commands are common with DHI PPC Pressure/Controller
Calibrators.

4.3.1

Program Message Format

Each program message sent is also a query. You can only send one program message to
the RPM4-E-DWT at time. The command can be followed with an optional query operator“?” if desired, but it is not mandatory. After sending any program message, you must wait
for the RPM4-E-DWT to reply before sending another program message. This reply willcontain data, or a numeric error message if the program message was invalid. You must wait
for this reply before issuing another program message to the RPM4-E-DWT. This insuresthat the RPM4-E-DWT has completed the program message. Most remote program
messages will return a reply within 500 ms except:“PR?”, “PRR?”, “SR?”, “ATM?”, “RATE?”:

Up to 2 seconds.

“RPT”, “ARANGE”, “AUTOZERO=RUN”:

Up to 3 seconds

The syntax and format used for each program message in the classic mode is listed next to
the keyword “Classic”’ in each program message summary in Section 4.4.4. The format for
the enhanced mode is also indicated where needed.

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4. REMOTE OPERATION

4.3.2

Error Queue

The RPM4-E-DWT keeps track of remote errors by using an error queue. If an error occurs,
the reply to the offending command will be “ERR#nn” where nn is the error code from 0 to 99.
The text description of the error is pushed onto the Error Queue. You should always checkthe reply for an error and handle as needed. The “ERR?” (or “ERR”) query can then be used
to pull the error from the Error Queue in it’s descriptive text format. If you are using theenhanced program message format, the Error Queue will accumulate errors until full unlessthey are pulled from the queue. If you are using the classic program format, the Error Queueis cleared every time a new program message is received
Examples:•COM1 enhanced mode command:“*CLS” or “*CLS?”(Clear the error queue. Wait for reply)“UNIT KPA” or “UNIT? KPA” (Generates a reply. User must wait for reply
before continuing)“MMODE A” or “MMODE? A” (Generates a reply. User must wait for reply
before continuing)“PR” or “PR?” (Generates a reply. User must wait for reply before continuing)

4.3.2.1

Using Query Type Commands

The QUERY type of program message just requests data from the
RPM4-E-DWT.
Placing the query operator “?” immediately after the command is optional. Allcommands generate a reply that you must wait for and receive before sending
the next command. Most queries return a reply within 200 ms except:“PR?”, “PRR?”, “SR?”, “ATM?”, “RATE?”:

Up to 2 seconds.

“RPT”, “ARANGE”, “AUTOZERO RUN”:

Up to 3 seconds

The syntax for using a QUERY program message is listed next to the keyword“Query:” in each program message summary in Section 4.4.4.

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4.4

Commands
4.4.1

Programming Messages

Some commands accept an optional suffix. This suffix can be used to specify the explicit
Q-RPT to address. In most cases, each Q-RPT in the RPM4-E-DWT operates as anindependent measurement device. If the suffix is not specified, then the “Active” Q-RPT is
assumed.
The “RANGE” or “ARANGE” command can be used to select the “Active” Q-RPT. See theprogram message descriptions for suffix use with a specific command.
Table 14. Program message list
COMMAND‘n’ indicates anoptional suffix#
ABORT
ARANGEn
ATESTDATAx,yATESTRNGxATM
AUTOZEROn
AUTOZEROn=RUN
CALAMB
COM1
COM2
CONTn
DATE
ERR
HEAD
ID
L2
L3
LOCAL
MEM
MSGFMT
PCALn
PCAL:XX
PRn
PRRn
QPRRn
RANGE
RATEn
READRATEn
READYCKnREMOTE
RESn
RESET
RPTn
SCRSAV
SN
SRn
SSn
SS%n
TIME
UCOEFn
UDU
ULn
UNITn
VER
ZOFFSETnZOFFSET:XX© 2009 DH Instruments, a Fluke Company

DESCRIPTION
Send a command string out of the RPM4-E-DWT COM2 port.
Stop pending operations.
Read or set a new AutoRange to use.
Read existing AutoTest data results.
Read existing AutoTest range and hearder data.
Read the current atmospheric pressure (on-board barometer).
Read or set the status of the AutoZ automatic zeroing function.
Run AutoZero.
Read or set the on-board barometer calibration.
Read or set the configuration of the COM1 port.
Read or set the configuration of the COM2 port.
Enable continuous measurements.
Read or set the current date.
Read the last error message.
Read or set the fluid head settings.
Read or set the RPM4-E-DWT alphanumeric asset ID tag.
Selects “classic” program message format.
Selects “enhanced” program message format.
Return control to the RPM4-E-DWT front panel.
Read the power-up memory test status.
Read or set the type of program message format to use.
Read or set the user Lo Q-RPT calibration information.
Read or set the user Lo Q-RPT calibration information (old command).
Read the next RPM4-E-DWT pressure.
Read the next RPM4-E-DWT pressure, rate, and ATM.
Read the last RPM4-E-DWT pressure, rate and ATM.
Select a Q-RPT to be “active” in it’s default full scale range.
Read the next available rate of change of pressure.
Read or set the Q-RPT measurement read rate and mode.
Read or set a flag that is cleared by a Not Ready condition.
Enable remote local lockout operation.
Read or set the pressure display resolution for the current Q-RPT and range.
Reset the RPM4-E-DWT to default user parameters.
Read the available Q-RPT data.
Read or set the front panel screen saver period.
Read the serial number of the RPM4-E-DWT.
Read the next available pressure status (Ready/Not Ready).
Read or set the stability required for a Ready condition.
Read or set the stability required for a Ready condition (% span/ s).
Read or set the current time of day.
Convert a pressure in Pascal to pressure in the current units.
Read or set the user defined pressure unit.
Read or set the upper limit for the current range.
Read or set the pressure unit of measure for the current range.
Read the RPM4-E-DWT software version.
Read or set the AutoZero Zoffset for the specified Q-RPT.
Read or set the AutoZ Zoffset for the specified Q-RPT (old command).

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4. REMOTE OPERATION

4.4.2

ERROR Messages
Table 15. Error #s and descriptions
REPLY
ERR# 0
ERR# 2
ERR# 3
ERR# 4
ERR# 5
ERR# 6
ERR# 7
ERR# 8
ERR# 9
ERR# 10
ERR# 11
ERR# 12
ERR# 13
ERR# 14
ERR# 17
ERR# 18
ERR# 19
ERR# 20
ERR# 21
ERR# 22
ERR# 23
ERR# 25
ERR# 26
ERR# 27
ERR# 28
ERR# 29
ERR# 30
ERR# 31
ERR# 32
ERR# 37
ERR# 38
ERR# 39
ERR# 45
ERR #46
ERR #52
ERR# 53

DESCRIPTION“OK”“Text argument is too long”“Arguments cannot be 0”“External device not detected”
Not used“Numeric argument missing or out of range”“Missing or improper command argument(s)”“External device time-out error”“Unknown command”“Missing or invalid command suffix”“Command missing argument”“System overpressured” or “overpressure may result”“Text queue overflow”“User unit not defined”
Not used“Command not yet available”“Not available with absolute units”“Not available with gauge device”
Not used“Pressure is not stable”“Option not available or installed”
Not used“COM port failed to initialize”“Internal device failure”“Device failure”“Device not available”“Must be on range HI”“Exceeds upper or lower limit”“Not stable enough”“Data table is full”“Selected range is not available”“Data verify error”“Argument not allowed”“Argument cannot be negative”“Command obsolete”“Not Available”

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4.4.3

Program Message Description Overview

Each program message description is separated into the following sections:PurposeA brief description of the programs message’s function.

CommandThis is the Enhanced program message syntax to send data to the RPM4-E-DWT or to
execute an RPM4-E-DWT function. The RPM4-E-DWT must be set to use the enhanced
format (see Section 3.9.2.3) to use the syntax and style shown. It may be sent alone, or
followed by at least one white space and additional argument(s) to show that arguments
can be passed. If there are multiple arguments, then commas must separate them. The
RPM4-E-DWT will reply and you must wait for this reply. If this field is not listed in the
program message description, then the Command type is not supported when using theEnhanced format.

QueryThis is the Enhanced program message syntax to request data from the RPM4-E-DWT. The
RPM4-E-DWT must be set to use the enhanced format (see Section 3.9.2.3). The
RPM4-E-DWT will always reply to a query. You must wait for this reply before issuing
another program message. If this field (Query) is not listed in the program message
description, then the Query type for the program message is not supported when using
the Enhanced format.

Classic

This is the Classic program message syntax to send data to the RPM4-E-DWT, to
execute an RPM4-E-DWT function, or to query for data. The RPM4-E-DWT must be set
to use the classic format (see Section 3.9.2.3). The command may be followed by a ‘(=)’
and additional argument characters to show that argument(s) can be passed. If there are
multiple arguments, then commas must separate them. The RPM4-E-DWT will always reply
to a program message.
You must wait for this reply before issuing another program message. If this field is not listed
in the program message description, then it is not supported when using the classic
format.

SuffixSome commands support an optional suffix. This suffix is used to specify a Q-RPT to which
the command applies, since many settings are Q-RPT specific:
Suffix of ‘1’ for Hi Q-RPT accessSuffix of ‘2’ for Lo Q-RPT access
If an optional suffix is allowed but not given, then the “Active Q-RPT” will be addressed. The“Active Q-RPT” is the Q-RPT that is currently displayed on the top line of the front panel of the
RPM4-E-DWT, and is identified by the text label in the upper right of the pressure display
screen. The last Q-RPT ranged or selected using the “RANGE” or “ARANGE” commands isthe “Active” Q-RPT. The “ARANGE”, “RANGE” or “RPT” command query can be used todetermine which Q-RPT is currently active.

Arguments

If the program message can be used to set data inside the RPM4-E-DWT, then this section
describes the arguments and their limits.

Default

If the program message can be used to set data inside the RPM4-E-DWT, then this line
shows (using the enhanced format) the default setting from the factory.

Remarks

This field has the details and remarks about the command.

ExampleExamples are given for the enhanced and classic methods.
Enhanced:

An example of the use of an enhanced format program message to besent to the RPM4-E-DWT is shown.
The message sent to the
RPM4-E-DWT appears after the “Cmd sent:” label. If only a Query type
exists, the “Query sent:” label is shown instead. Directly under thislabel, “Query reply” shows a typical reply to a query type. “Reply:”shows that a query format does not exist. It may have a short description
next to it.

Classic:

An example of the use of a classic program message to be sent to the
RPM4-E-DWT is shown. The command sent to the RPM4-E-DWT
appears after the “Cmd sent:” label. The “Reply” label shows a typical
reply to the “Sent” example. It may have a short description next to it.

ErrorsIf the program message can report an argument error, the types of errors are listed.
The error message is replied after receiving the program message. The “ERR” or“ERR?” query can be used to retrieve a text description of the error.

See Also

Indicates related commands (“----“) and refers to manual sections giving detail on
RPM4-E-DWT operation corresponding to the program message.

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4. REMOTE OPERATION

4.4.4

Program Message Descriptions#
PurposeTo allow the host PC to communicate with a device connected to the RPM4-E-DWT
COM2 port.

Classic“#xx”

Arguments

xx:

Remarks

The RPM4-E-DWT COM2 port can be used to communicate to another RS232 device(such as another RPM4-E-DWT). This allows the user to use a single COM port orIEEE-488 port on the host computer to communicate with the RPM4-E-DWT and another
RS232 device. A carriage return and a line feed (<CR><LF>) are added to the string.

The string to send out of the RPM4-E-DWT COM2 port. It must be lessthan
40 characters long.

After this program message is issued, the RPM4-E-DWT will reply back every stringreceived by the RPM4-E-DWT COM2 port that is terminated with a carriage return. Line
feeds are discarded. This will discontinue when the next query is sent to the
RPM4-E-DWT.
There is no other reply from this program message. Prior to using this program message,
you must ensure that the RPM4-E-DWT COM2 port is correctly set up to communicate
with the device on COM2. Refer to the “COM2=“ program message.
ExampleSent:“#VER”(classic)

Reply:“DH INSTRUMENTS RPM4-E-DWT us A70M/A7M Ver1.00 ”

This example assumes that a second RPM4-E-DWT’s COM1 port is connected to the
RPM4-E-DWT COM2 port. This example gets the version of the second RPM4-E-DWT.
See Also“COM2”
3.9.2

ABORT
PurposeCommandClassic
Remarks
Example(enhanced)
Example(classic)See Also

Cancels any pending data requests by the “PR”, “PRR” “RATE”, “SR” or “CONT”
commands.
“ABORT”“ABORT”
This program message is usually used to ensure the RPM4-E-DWT is in an idle condition.
Cmd sent:“ABORT”
Reply:“ABORT” (no reply if IEEE-488)
Sent:“ABORT”
Reply:“ABORT”“PR”, “PRR”, “RATE”, “SR”, “CONT”

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ARANGEn
PurposeCommandQuery
Classic
Query
Optional Suffix
Arguments

Remarks

Example(enhanced)
Example(classic)
Example(enhanced)
Example(classic)
Example(enhanced)
Example(enhanced)
ErrorsSee Also

Read or set a new AutoRange range to use.
“ARANGEn Range, unit, mode (,RptLabel)”(set to user defined range)“ARANGE Q-RPTLabel”(set to Q-RPT default range)“ARANGEn?”“ARANGEn= Range, units, mode (,RptLabel)”(set to user defined range)“ARANGE= Q-RPTLabel”(set to Q-RPT default range)“ARANGEn”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPTThe AutoRange maximum pressure. Cannot be negative.
Range:The unit of measure of the Range argument.
Unit:
The measurement mode of the Range argument:
Mode:“G” for gauge
One of the Q-RPTs that is available.
RptLabel:(optional)“IH”: Hi Q-RPT if the Hi and Lo Q-RPTs are NOT OFF. HL Q-RPT if
the Hi and Lo Q-RPTs are OFF.
“IL”: Lo Q-RPT“HL”: HL Q-RPT.
The ARANGE command is used to define an RPM4-E-DWT range by specifying adesired unit of measure, measurement mode and maximum pressure, and have the
RPM4-E-DWT pick the best available Q-RPT and make adjustments to optimize
operation in that range.
The optional suffix or the “RptLabel” argument can be used to specify which Q-RPT you
wish to use for the AutoRange range instead of allowing the RPM4-E-DWT to pick thebest Q-RPT. By using this option you can override the internal logic that picks the mostsuitable Q- Q-RPT. This Q-RPT specified must be valid for the maximum pressure andmeasurement mode specified.
The reply indicates the current range data, including the Q-RPTLabel used for the range.
If “inWa” is specified for the unit, the temperature reference can be given after the unit
text (“inWa4”, “inWa20” or “inWa60” corresponding to inWa at 4 °C, 20 °C or 60 °F). If nonumber is given, a default of 20 °C is assumed. There is no indication of the temperaturereference in the reply.
If you just specify the Q-RPTLabel without any other arguments, the Q-RPT specified will
become active in it’s last range and settings. The previously set unit and measurementmode for the Q-RPT specified will become active.
Cmd sent:“ARANGE?”(read the current range in the current units)
Query reply:“100.00, psi, G, IH”
Cmd sent:“ARANGE”(read the current range in the current units)
Query reply:“100.00, psi, G, IH”
Cmd sent:“ARANGE? 250, inWa4, G (range of 250 inWa @ 4 °C in gauge mode)
Query reply:“250.00 inWa, G, IH”(Lo Q-RPT is used)
Cmd sent:“ARANGE=500, kPa, G(range of 500 kPa in gauge mode)
Query reply:“500.00 kPa, G, IL”(Lo Q-RPT is used)
Cmd sent:“ARANGE2 50, psi, G(range of 50 psi in gauge mode on
the Lo Q-RPT)
Query reply:“50.000 psi, G, IL”
Cmd sent:“ARANGE IH(Hi Q-RPT’s prev range made active)“500.000 kPa, A, IH”
Query reply:“Range“ maximum pressure exceeds available Q-RPTs or is negative.
ERR# 6:
RPT specified by the optional suffix is not valid for the current operating
ERR#10:conditions
Cannot Range to ‘0’ with gauge units.
ERR# 20:
Correct type of Q-RPT for the selected “Mode” is not available.
ERR# 29:
RPT specified is not available.
ERR# 53:“RPT”, “RANGE”, “UNIT”
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4. REMOTE OPERATION

ATM
Purpose
Query
Classic
Remarks

Example(enhanced)
Example(classic)
ErrorsSee Also

Reads the next measured pressure from RPM4-E-DWT’s on-board barometer (ifpresent).
“ATM?”“ATM”
The atmospheric pressure as measured by the RPM4-E-DWT on-board barometer isreturned in the current pressure units of the active Q-RPT (always absolute). Thismeasurement is followed by the units text. Not all RPM4-E-DWTs are equipped with an
on-board barometer.
Query sent:“ATM?”
Query reply:“97.12348 kPa a”
Sent:
“ATM”
Reply:“97.12384 kPa a”
ERR# 23:
RPM4-E-DWT is not equipped with a barometer.
3.9.7.1

ATESTDATAx,yPurposeRead existing AutoTest data results.

Command“ATESTDATAx,y”

Suffixx:y:Remarks

AutoTest results are stored in the lowest empty space available as selected by ‘x’. The
individual test points are stored in ascending order as selected by ‘y’ The “ATESTRNGx”
command should be used prior to using the “ATESTDATAx,y” command to determine therange of the AutoTest that created the data and the number of test points in the test.

The results file index (1 to 10)
The test point within the test (1 to 51)

The “ATESTDATAx,y” command returns 2 fields separated by commas:
Test pressure:

The requested pressure point

Ref pressure:

The RPM4-E-DWT reference pressure.

Tolerance:

The tolerance in pressure.

ExampleCmd sent:
Reply:“ATESTDATA1”“150.00, 150.34 , 0.50”

Errors

ERR# 10:
ERR# 52:

No data exists for this file index
End of test points for this test.

See Also“ATESTRNG”
3.7.11, 3.8.5

ATESTRNGx
PurposeCommand
SuffixRemarks

ExampleErrorsSee Also

Read existing AutoTest range and header data.
“ATESTRNGx”x:
The results file index (1 to 10)
AutoTest results are stored in the lowest empty space available as selected by ‘x’. The“ATESTRNGx” command gets the test definition range and operating conditions. Thisshould be done before using the “ATESTDATAx,y” command to determine the range ofthe autotest that created the data and the number of test points in the test.
The “ATESTRNGx” command returns 9 fields separated by commas:
Range:The range of the AutoTest.
Units:The range and AutoTest pressure units and mode.
RPT used:’Hi’ or ’Lo’ if the high or low Q-RPT was used.
Head enabled:’0’ or ‘1’ if head was disabled or enabled during the auto test.
AZ enabled:’0’ or ‘1’ if auto zero was disabled or enabled during the auto test.
Test points:
Number of test points in the test.
Test type:’0’ or ‘1’ if the test was a ”file” or “quick” auto test.
Test date:
Date the auto test was ran (YYYYMMDD)
Test time:
Time the auto test was ran (HH:MMx)
Cmd sent:“ATESTRNG1”
Reply:“200.00 ,kPa g,Lo, 0, 1, 2,0, 20081016, 03:30p”
ERR# 10:No data exists for this file index
ERR# 52:
End of test points for this test.
“ATESTRNG”
3.7.11, 3.8.5

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E-DWT-H OPERATION AND MAINTENANCE MANUALAUTOZEROn
PurposeCommandQuery
Classic

Read or set the status of the AutoZ function.
“AUTOZEROn state”“AUTOZEROn?”“AUTOZEROn= state”“AUTOZEROn”“AUTOZERO1”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPT‘state’:’0’ Autozero OFF’1’ Autozero ON
The RPM4-E-DWT AutoZ function can be turned ON and OFF.
Cmd sent:“AUTOZERO 0”
Query reply:“0”(No reply if GPIB-488)
Sent:“AUTOZERO=0”
Query reply:“AUTOZERO=0”
ERR# 7:
The argument was other than ‘0’ or ‘1’.
ERR# 10:The suffix is invalid.
“ZOFFSET”
3.9.1

Default
Optional Suffix
Arguments
Remarks
Example(enhanced)
Example(classic)
ErrorsSee Also
AUTOZEROn=RUN
PurposeCommandQuery
Classic
Optional Suffix
Arguments
Remarks
Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also
CALAMB
PurposeCommandQuery
Classic
Defaults
Arguments
Remarks
Example(enhanced)
Example(classic)
ErrorsSee Also

Run the AutoZero routine.
“AUTOZEROn RUN (,Pref)”“AUTOZEROn? RUN (,Pref)”“AUTOZEROn= RUN (,Pref)”A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPT‘Pref’:The AutoZ reference pressure in Pa. Optional when the RPM4-E-DWT is not in
absolute measurement mode, as the reference is usually “0”.
The RPM4-E-DWT AutoZ function can be remotely run with this command only if
AutoZero is ON. You should ensure that the pressure is stable for valid determination of
Zoffset.
Cmd sent:“AUTOZERO RUN”
Query reply:“OK”(No reply if GPIB-488)
Cmd sent:“AUTOZERO? RUN, 0”
Query reply:
“OK”
Sent:
“AUTOZERO=RUN”
Query reply:“OK”
ERR# 10:Invalid suffix
ERR# 53
AutoZero is currently OFF.
“ZOFFSET”, “AUTOZERO”
3.9.1, 3.7.10

Read or set the on-board barometer calibration.
“CALAMB adder, mult, CalDate”“CALAMB?”“CALAMB=adder, mult, CalDate”“CALAMB”“CALAMB = 0.0, 1.0, 19800101”
The Barometer calibration adder (PA), in Pascal.
Adder:The Barometer calibration multiplier (PM) from 0.1 to 100.
Mult:
The date of the calibration in the format “YYYYMMDD”
CalDate:The barometer calibration information can be accessed with this program message. Using thisprogram message overwrites the current calibration coefficients, so caution must be used.
Changes made take effect immediately.
Cmd sent:“CALAMB? 2.1, 1.000021, 20011201”
Query reply:“
2.10, 1.000021, 20011201”
Sent:“CALAMB=2.1, 1.000021, 20011201”
Reply:“
2.10, 1.000021, 20011201”
ERR# 6:
One of the arguments is out of range.
3.9.7.1, 5.2.2© 2009 DH Instruments, a Fluke Company

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4. REMOTE OPERATION

COM1
PurposeCommandQuery
Classic
Arguments

Defaults
Remarks

Example(enhanced)
Example(enhanced)
Example(classic))
ErrorsSee Also

Read or set the RS232 settings for the COM1 port.
“COM1 baud, parity, data, stop”“COM1?”“COM1=baud, parity, data, stop”“COM1”The baud rate. This may be ‘300’, ‘600’,’1200’,’2400’,’4800’, ‘9600’ or ‘19200’.
Baud:
The data parity. This may be ‘O’ for odd, ‘E’ for even, or ‘N’ for none.
Parity:The number of data bits. This may be ‘7’ or ‘8’.
Data:
The number of stop bits. This may be ‘1’ or ‘2’.
Stop:
“COM1 2400,E,7,1”
The COM1 port is used to communicate to the RPM4-E-DWT. When the COM1 port configurationof the RPM4-E-DWT is changed, the program message reply (COM1 use only) is sent at the old
COM1 settings, but all subsequent communications are accomplished at the new COM1 settings.
A 250ms or longer delay after receiving the reply to this command will ensure that the
RPM4-E-DWT has changed the COM port settings and is ready for communications at the new
settings.
Cmd sent:“COM1 9600,N,8,1”
Query reply:“9600,N,8,1”(No reply if GPIB-488)
Cmd sent:“COM1? 9600,N,8,1”
Query reply:“9600,N,8,1”
Sent:“COM1=9600,N,8,1”
Reply:“9600,N,8,1”
ERR# 7:
Missing or improper program message argument(s).
“COM2”
3.9.2.1

COM2
PurposeRead or set the RS232 settings for the COM2 port.

CommandQuery“COM2 baud,parity,data,stop”“COM2?”Classic“COM2= baud,parity,data,stop”“COM2”
baud:
The baud rate. This may be ‘300’, ‘600’,’1200’,’2400’,’4800’, ‘9600’ or ‘19200’.
parity:The data parity. This may be ‘O’ for odd, ‘E’ for even, or ‘N’ for none.
The number of data bits. This may be ‘7’ or ‘8’.
Data:
stop:
The number of stop bits. This may be ‘1’ or ‘2’.
“COM2 2400,E,7,1”
COM2 is generally used to allow the host computer to communicate through the RPM4-E-DWT toan additional device connected to COM2. This can be useful if the host computer does not have 2
serial ports available.
Cmd sent:“COM2 9600,N,8,1”
Query reply:“9600,N,8,1”(No reply if GPIB-488)
Cmd sent:“COM2? 9600,N,8,1”
Query reply:“9600,N,8,1”
Sent:“COM2=9600,N,8,1”
Reply:“9600,N,8,1”
ERR# 7:
Missing or improper program message argument(s).
“COM1”
3.9.2.1

Arguments

Defaults
Remarks
Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also

Page 83© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

CONTn
Purpose
Query
Classic
Optional Suffix

Remarks

Example(enhanced)
Example(classic)See Also
DATE
PurposeCommandQuery
Classic
Arguments
Remarks
Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also
ERR
Purpose
Query
Classic
Remarks

Example(enhanced):
Example(classic)See Also

Have the RPM4-E-DWT reply continuously as each new measurement becomes available.
“CONTn?”“CONTn”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPTThis command is somewhat different than most as it enables the RPM4-E-DWT to continuously
output the selected Q-RPT’s measurement without further queries. This continues until the next
query is received by the RPM4-E-DWT, or if the ABORT” or “*CLS” command is received. The
frequency of the measurements is determined by the read rate of the Q-RPT. The data returned
includes the pressure of the specified or active Q-RPT, current unit of measure and measurement
mode.
Query sent:“CONT1?”
Query reply:“1936.72 kPa a” (repeats every measurement cycle)
Query sent:“CONT”
Reply:“1936.72 kPa a” (repeats every measurement cycle)“PR”, “READRATE”
Read or set the RPM4-E-DWT date.
“DATE date”“DATE?”“DATE= date”“DATE”
date:
The date in the numerical only format “YYYYMMDD”
The RPM4-E-DWT has an internal real time calendar clock. The span of acceptable dates
ranges from 19800101 to 20791231. The reply is always in the YYYYMMDD format.
Cmd sent:“DATE 20030115”
Query reply:“20030105”(No reply if GPIB-488)
Cmd sent:“DATE? 20030105”
Query reply:“20030105”
Sent:“DATE=20021201”
Reply:“20021201”
ERR# 6:
Missing or improper program message argument(s).
“TIME”
3.9.5.3
Read the new available error message from the Error Queue.
“ERR?”“ERR”
This program message obtains additional details about an error that has occurred. If the user
receives an “ERR# nn” reply, or the enhanced mode is enabled using the IEEE-488 interface
and an error has been detected, the error is put into a FIFO Error Queue. The “ERR”
program message pulls and replies the oldest error message available. In “classic” mode
only the most recent error can reside in the queue. “OK” is replied if there are no error
messages left. If an error occurs in enhanced mode using the IEEE-488 interface, no reply is
generated even if the command was a query.
Query sent:“ERR?”
Query reply:“Numeric argument missing or out of range”
Sent:
“ERR”
Reply:“Numeric argument missing or out of range”
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4. REMOTE OPERATION

HEAD
PurposeCommandQuery
Classic
Defaults
Arguments

Remarks
Example(enhanced)
Example(classic)
ErrorsSee Also:
ID
PurposeCommandQuery
Classic
Arguments
Remarks

Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also
L2 / L3
PurposeCommandDefaults
Remarks
Example(enhanced)
Example(classic)See Also

Read or set the fluid head settings.
“HEAD height, units, fluid”“HEAD?”“HEAD=height, units, fluid”“HEAD”“HEAD 0, cm, N2”
The height of the test in relation to the RPM4-E-DWT. The value is positive if theheight:test is above the RPM4-E-DWT, or negative if below the RPM4-E-DWT. The
value can be between - 9999 and 9999. Setting the value to ‘0’ disables the headcorrection.
The height units. This must be “in” or “cm”.
Units:
The fluid type. This must be “N2”, “Air”, “He”, “Oil”, “H2O”, or “User”.
gas:
The RPM4-E-DWT can make a fluid head correction to allow it to display the pressure at a level
other than the reference level of the RPM4-E-DWT.
Cmd sent:“HEAD? 10,in,N2”
Query reply:“10, in, N2”
Sent:“HEAD=10,in,N2”
Reply:“10, in, N2”
ERR# 2:
The fluid text is too long
ERR# 6:The height is not within given limits or the unit is invalid.
ERR #7:
The fluid text is invalid
3.7.8, 3.9.3
Read or set the user defined instrument identification label.
“ID string”“ID”“ID=string”“ID”
An alphanumeric string up to 12 characters long.
String:
The user defined ID label can be used to allow the user to “tag” the RPM4-E-DWT with aunique identifier. This ID is stored in non-volatile memory and cannot be erased by a power
failure, system fault or reset. The ID should not be changed frequently, as the non-volatilememory may fail after 100,000 write operations.
Cmd sent:“ID RPM4-E-DWT #A01”
Query reply“RPM4-E-DWT #A01”(No reply if
GPIB-488)
Cmd sent:“ID? RPM4-E-DWT #A01”
Query reply“RPM4-E-DWT #A01”
Sent:“ID=RPM4-E-DWT #A01”
Reply:“RPM4-E-DWT #A01”
ERR# 2
Text argument is too long (more than 12 characters)
3.9.5.4
Read or set the type of program command format to use (classic or enhanced).
“L2”
enables “classic” mode
“L3”
enables “enhanced” mode
“L2”
(Classic mode)
The user can select the type of remote command format using these simplified commands.
There is no query format. This format must agree with the format sent to the RPM4-E-DWT.
This command is a replacement for the “MSGFMT” command.
Cmd sent:“L3”
Query reply:
“L3”
Sent:
“L2”
Reply:“L2”“MSGFMT”
4.3, 3.9.2.3

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LOCALPurposeCommandClassic
RemarkExample(enhanced)
Example(enhanced)
Example(classic)See Also
MEM
Purpose
Query
Classic
Remarks
Example(enhanced)
Example(classic)See Also
MSGFMT
PurposeCommandQuery
Classic
Arguments
Defaults
Remarks

Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also

Returns control to the RPM4-E-DWT front panel.
“LOCAL”“LOCAL”
The REMOTE program message can lock the front panel out completely. The user can return
to local operation by sending the LOCAL program message, sending the IEEE-488 ‘GTL’
command (if in enhanced format), or by cycling RPM4-E-DWT power.
Cmd sent:“LOCAL”
Reply:“LOCAL”(no reply if IEEE-488)
Cmd sent:“LOCAL?”
Reply:“LOCAL”
Sent:“LOCAL”
Reply:“LOCAL”“REMOTE”
Read the status from the power-up memory test.
“MEM?”“MEM”
The RPM4-E-DWT system memory stores the user settings (units, resolution) and retains
them when the unit is OFF. On power-up, this memory is checked. If this memory is corrupted,
all user settings are reset to default , and the MEM status is set to reflect this.
Query sent:“MEM?”
Reply:“0” RPM4-E-DWT data corrupted and was set to factory defaults.
“1” The memory was found to be OK on power-up.
Sent:
“MEM”
Reply:“MEM=0” RPM4-E-DWT data corrupted and was set to factory defaults.
“MEM=1” The memory was found to be OK on power-up.
3.9.9, 3.9.7.5
Read or set the type of program command format to use (enhanced or classic).
“MSGFMT mode
“MSGFMT?”“MSGFMT= mode
“MSGFMT”‘1’ to use the enhanced command format.
mode:‘0’ to use the classic command format.
“MSGFMT 0”
The user can select the type of remote command format to use. This format must agree with theformat sent to the RPM4-E-DWT
The enhanced query form of this command (“MSGFMT? n”) should always be used to set thedesired format, as it will be accepted regardless of the current format (classic or enhanced).
It is recommended to use the “L2” and “L3” commands instead of this command for new designs.
Cmd sent:“MSGFMT 1”
Query reply:“1”(No reply if IEEE-488)
Cmd sent:“MSGFMT? 1”
Query reply:
“1”
Sent:
“MSGFMT=1”
Reply:“MSGFMT=1”
ERR# 6:
Missing or improper program message argument(s).
“L2 / L3”
4.3, 3.9.2.3© 2009 DH Instruments, a Fluke Company

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4. REMOTE OPERATION

PCALn
PurposeCommandQuery
Classic
Defaults
Optional Suffix

Arguments

Remarks

Example(enhanced)
Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also
PRn
Purpose
Query
Classic
Optional Suffix

Remarks

Example(enhanced)
Example(classic)See Also

Read or set the calibration information for the Hi or Lo Q-RPT.
“PCALn adder, mult, CalDate”“PCALn?”“PCALn= adder, mult, CalDate”“PCALn”“PCALn = 0.0, 1.0, 19800101”
The active Q-RPT is assumed if no suffix is given. The Hi Q-RPT is assumed if the HL“n”
Q-RPT is active and no suffix is given.
‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPTThe Q-RPT calibration adder (PA). In Pascal.
Adder:The Q-RPT calibration multiplier (PM) from 0.1 to 100.
Mult:
The date of the calibration in the format “YYYYMMDD” by default. Any other
CalDate:format up to 8 characters long is also accepted, and the replied format is in thepreviously entered format.
The user defined pressure calibration information for the specified Q-RPT (Hi or Lo) can beaccessed with this program message. Using this program message overwrites the current
calibration coefficients, so caution must be used. Changes made using this program message
take effect immediately.
For compatibility with the obsolete style PPC3 “PCAL:HI” and “PCAL:LO” commands, “:HI” and“:LO” can be used in place of the suffix “n” but this is not recommended for new applications.
Cmd sent:“PCAL2? 2.1, 1.000021, 20011201”
Query reply:“ 2.10 Pa, 1.000021, 20011201” (No reply if GPIB-488)
Cmd sent:“PCAL? 2.1, 1.000021, 20011201”
Query reply:“ 2.10 Pa, 1.000021, 20011201”
Cmd sent:“PCAL:HI? 2.1, 1.000021, 20011201” (PPC3 style is OK)
Query reply:“ 2.10 Pa, 1.000021, 20011201”
Sent:“PCAL1=2.1, 1.000021, 20011201”
Reply:“ 2.10 Pa, 1.000021, 20011201”
ERR# 6:
One of the arguments is out of range.
ERR# 10:The suffix is invalid.
5.2.2
Read the next available pressure measurement.
“PRn?”“PRn”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPTThe next available pressure value for the specified or active Q-RPT is read in the current pressure
units. The data returned also contains Ready/Not Ready information, and the pressure unit ofmeasure and measurement mode.
The reply field is always 20 characters long. The first 3 characters of the reply are reserved for the
ready status. The ready status is described in the “SR” program message. The pressure value andpressure unit of measure are right justified in this field.
After receiving this program message, the RPM4-E-DWT replies back with the data after a newpressure measurement cycle is complete. This can take up to the current read rate period (1.2
seconds by default).
Query sent:“PR?”
Query reply:“R
1936.72 kPa g”
Query sent:“PR”
Reply:“R
1936.72 kPa g”“PRR”, “QPRR”, “SR”, “ABORT”, “READRATE”
3.6.1, 3.1.2, 3.9.7.2

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

PRR
Purpose
Query
Classic
Optional Suffix

Remarks

Example(enhanced)
Example(classic)See Also
QPRR
Purpose
Query
Classic
Optional Suffix

Remarks

Example(enhanced)
Example(classic)See Also

Read the next available Ready condition, pressure measurement, rate and on-board
barometer reading.
“PRR?”“PRR”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPTThe next available Ready condition, Q-RPT pressure measurement, rate of pressure change,
and barometric pressure is replied in the current pressure unit of measure. . This can take up
to the current read rate period (1.2 seconds by default). Each data field is separated by acomma, and is returned in the following order:
ready, pressure UNITS, rate UNITS/s, atm UNITS
Here are the field descriptions:ready:
Three character ready status field. Refer to the “SR” command.
pressure:
The measured pressure for the active Q-RPT in the current pressure unit.
This is followed by the current pressure unit.
rate:
The measured rate of pressure change for the active Q-RPT in the current
pressure unit per second. This is followed by the current pressure unit of measure.
atm:
The pressure measured by the RPM4-E-DWT on-board barometer in the current
pressure unit (and always absolute). This is followed by the current pressure
unit.
Query sent:“PRR?”
Query reply:“R,2306.265 kPag,0.011 kPa/s,97.000 kPa g”
Query sent:“PRR”
Reply:“R,2306.265 kPag,0.011 kPa/s,97.000 kPa g”“PR”, “QPRR”, “SR”
3.6.1, 3.1.2, 3.9.7.1
Read the last Q-RPT pressure measurement, pressure rate and on-board barometer output
immediately.
“QPRR?”“QPRR”A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPT

The last measured Ready/Not Ready condition, active Q-RPT pressure measurement, rate ofpressure change, and barometric pressure is replied in the current pressure unit of measure
immediately. This program message is useful when a rapid response of measured pressure
is needed. It does not result in quicker pressure measurements. Each data field is separated
by a comma, and is returned in the following order:
Ready, pressure UNITS, rate UNITS/s, atm UNITS
Here are the field descriptions:ready:
Three character ready status field. Refer to the “SR” command.
pressure:
The measured pressure for the selected Q-RPT in the current pressure unit.
This is followed by the current pressure unit and measurement mode.
rate:
The measured rate of pressure change for the active Q-RPT in the current
unit of pressure per second. This is followed by the current pressure unit.
atm:
The pressure measured by the RPM4-E-DWT on-board barometer in thecurrent pressure unit (but always absolute). This is followed by the current
pressure unit.
Query sent:“QPRR?”
Query reply:“R,2306.265 kPa g,0.011 kPa/s,97.000 kPa g”“R,2306.265 kPa g,0.011 kPa/s” (no barometer)
Query sent:“QPRR”
Reply:“R,2306.265 kPa g,0.011 kPa/s,97.000 kPa g”“PR”, “PRR”, “SR”
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4. REMOTE OPERATIONRANGE
PurposeCommandQuery
Classic
Default
Remarks

Example(enhanced)
Example(classic)
Example(classic)
ErrorsSee Also
RATEn
Purpose
Query
Classic
Optional Suffix

Remarks

Example(enhanced)
Example(classic)See Also
READRATEn
PurposeCommandQuery
Classic
Optional Suffix
Arguments
Remarks
Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also

Change the active range to the default range of the Hi or Lo Q-RPT. Replies the active range
full scale, pressure unit and measurement mode.
“RANGE Rng”
“RANGE?”“RANGE= Rng”
“RANGE ”“RANGE IH”“IH” for the Hi Q-RPT
Rng:“IL” for the Lo Q-RPT
The active Q-RPT must be selected before making changes to settings that are dependent on therange. Q-RPTs selected with this command are used with their full default pressure range. The reply
indicates the active range in psi.
Used as a simple query, the active range is returned, which can be an AutoRanged range or adefault range (see “ARANGE” cmd).
Cmd sent:“RANGE? IL”(select internal Lo Q-RPT in it’s full default range)
Query reply:“1000 psi g,IL”
Sent:“RANGE= IH”(select internal Hi Q-RPT in it’s full default range)
Reply:“10000 psi g, IH”
Sent:“RANGE”(request current range)
Reply:“1000 psi g,IL”
ERR# 6:
Invalid Rng argument.
ERR# 29:
The selected Q-RPT is not available.
“ARANGE”, “RPT”
3.1.1, 3.7.2, 3.7.5
Read the next available pressure rate of change.
“RATEn?”“RATEn”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPTThe next available pressure rate of change in the current pressure unit per second is returned.
After receiving this program message, the RPM4-E-DWT replies back with the data once a newpressure measurement cycle is complete. This can take up to the current read rate period (1.2
seconds
by default).
Query sent:“RATE?”
Query reply:“0.01 kPa/s”
Sent:“RATE2”
Reply:“0.03 kPa/s”“PRR”, “QPRR”
3.7.7.2
Read or set the specified or active Q-RPT read rate or auto read rate mode.
“READRATEn period”“READRATEn?”“READRATEn= period”“READRATEn”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPT
Period to integrate the measurement over (ms). Can be from 200 ms to 20000“period ":ms. Set to ‘0’ to enable automatic read rate.
The RPM4-E-DWT can have the speed in which it integrates each measurement (“read rate”)
automatically adjusted based on the rate, or it can manually set to a fixed period. Increasing the readrate increases the reply time for pressure and rate queries.
Cmd sent:“READRATE 1000”
Query reply:“1000”
Cmd sent:“READRATE? 1000”
Query reply:“1000”
Sent:“READRATE=1000”
Reply:“1000”
ERR# 6:The “period” argument is out of range.
ERR#10:The suffix ‘n’ is invalid“PR”, “PRR”, “SR”
3.9.7.2

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E-DWT-H OPERATION AND MAINTENANCE MANUALREADYCKn
PurposeCommandQuery
Classic
Optional Suffix
Remarks

Example(enhanced)
Example(enhanced)
Example(enhanced)
Example(classic)
Example(classic)
ErrorsSee Also
REMOTE
PurposeCommandClassic
Remarks

Example(enhanced)
Example(enhanced)
Example(classic)See Also
RESn
PurposeCommandQuery
Classic
Default
Optional Suffix

Arguments
Remarks
Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also

Read or set the Ready check flag.
“READYCKn 1”“READYCKn?”“READYCKn=1”“READYCKn”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPT
The internal ready check flag is cleared whenever the specified or active Q-RPT reaches a
Not Ready (NR) condition. The “READYCK” query returns the status of the flag. The flag is
set by sending the “READYCK 1” program message while the Q-RPT is in a Ready condition.
The “READYCK” program message query can then be used at a later time to determine
whether a Not Ready condition has occurred since the ready check flag was set.
Cmd sent:“READYCK1 1”
Query reply:“1” (no reply if GPIB-488)
Cmd sent:“READYCK1?”
Query reply:“1”
Cmd sent:“READYCK?”
Query reply:“1” (if Q-RPT condition has stayed Ready)“0” (if Q-RPT condition has NOT stayed Ready)
Sent:“READYCK=1”
Query reply:“READYCK=1”
Sent:“READYCK”
Query reply:“READYCK=1” (if Q-RPT condition has stayed Ready)“READYCK=0” (if Q-RPT condition has NOT stayed Ready)
ERR# 6:
Argument is not a ‘0’ or a ‘1’.
“SR”
3.1.2
Lock out the front panel keypads during remote operation.
“REMOTE”“REMOTE”
The RPM4-E-DWT goes into remote mode whenever communications take place. The user
can return to local operation by pressing the [ESC] key. The REMOTE program message
locks out the front panel completely. The only way to unlock the front panel after the“REMOTE” command is using the “LOCAL” program message, the IEEE-488 “GTL”
command, or by cycling the RPM4-E-DWT power.
Cmd sent:“REMOTE”
Reply:“REMOTE” (no reply if IEEE-488)
Cmd sent:“REMOTE?”
Reply:“REMOTE”
Sent:“REMOTE”
Reply:“REMOTE”“LOCAL”
To read or set the pressure display resolution for the active range.
“RESn res”
“RESn”“RESn= res”
“RESn”“RESn=0.001”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPT

The pressure display resolution in % span of the specified Q-RPT range (0.0001 to 1 %FS).
The pressure display resolution is defined as % span of the active range. The setting isseparate for each range, and changes as the range is changed.
Cmd sent:“RES .01”
Query reply:“0.01” (No reply if GPIB-488)
Cmd sent:“RES? .01”
Query reply:“0.01”
Sent:“RES=.01”
Reply:“0.01”
ERR# 6
The argument is invalid.
3.8.2
res:

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4. REMOTE OPERATIONRESET
PurposeCommandClassic
Remarks

Example(enhanced)
Example(enhanced)
Example(classic)See Also
RPTn
Purpose
Query
Classic
Optional Suffix

Remarks

Example(enhanced)
Example(classic)
ErrorsSee Also
SCRSAV
PurposeCommandQuery
Classic
Arguments
Default
Remarks
Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also

Reset the user’s settings to factory defaults.
“RESET”“RESET”
The RPM4-E-DWT has user settings (units, resolution, etc.) that can be reset to factory
defaults. The remote “RESET” program message corresponds to the front panel “Reset - Sets”.
System calibration coefficients and communications settings are not affected. The reset cycle
takes up to 3 seconds to complete. Remote communications should not take place during
this period.
Cmd sent:“RESET”
Reply:“RESET”(no reply if IEEE-488)
Cmd sent:“RESET?”
Reply:“RESET”
Sent:“RESET”
Reply:“RESET”
3.9.9.1
Read the available Q-RPT identification data.
“RPTn”“RPTn”A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPT
Two internal Q-RPTs are available for use in an RPM4-E-DWT. You can query the
RPM4-E-DWT for information about each particular Q-RPT. The Q-RPT data is returned in thefollowing format:
RPTLabel, Q-RPTLocator, Serial#, RngGa, RngAbs, Q-RPTMode
RngLabel:
RPT type label. This label identifies the Q-RPT type and range. This is
the same label used on the RPM4-E-DWT front panel screen.
RptLocator:
Text field identifying the Q-RPT position in the RPM4-E-DWT system.
“IH” identifies this as an internal, Hi Q-RPT“IL” identifies this as an internal, Lo Q-RPT
Serial#:The serial number of the Q-RPT.
RngGa:The Q-RPT default gauge mode range in the current pressure unit.
RngAbs:The Q-RPT default absolute mode range in the current pressure unit.
“NONE” appears in the field if the Q-RPT is a Gxxx, BGxxx or Axxx withabsolute and negative gauge modes OFF.
RptMode:‘G’ if Q-RPT is gauge Gxxx or Axxx with absolute and negative gauge
modes OFF and supports only gauge measurement mode.
Cmd sent:“RPT2?”(Get information on the Lo Q-RPT)
Query reply:“A7M, IL, 82345, 1000, NONE,G”
Cmd sent:“RP1”(Get information on the HL Q-RPT)
Query reply:“A70M, HL, 82349, 10000, NONE,G”
ERR#4:
External device not detected.
ERR# 10:Invalid suffix.
3.1.1
Read or set the front panel display screen saver activation time.
“SCRSAV n”“SCRSAV?”“SCRSAV=n”“SCRSAV”
The inactivity period (0 – 99 minutes) after which screen saver activates.
n:“SCRSAV 10”
The RPM4-E-DWT front panel will dim after a period of keyboard and remote inactivity.
Setting this value to ‘0’ disables this feature.
Cmd sent:“SCRSAV 30”
Query reply:“30”(No reply if GPIB-488)
Cmd sent:“SCRSAV? 30”
Query reply:
“30”
Sent:
“SCRSAV=30”
Reply:“30”
ERR# 6
The argument was invalid.
3.9.5.1

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

SN
Purpose
Query
Classic
Remarks
Example(enhanced)
Example(classic)See Also
SR
Purpose
Query
Classic
Optional Suffix

Remarks

Example(enhanced)
Example(classic)See Also
SS%n
PurposeCommandQuery
Classic
Optional Suffix

Arguments
Remarks
Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also

To read the serial number of the RPM4-E-DWT.
“SN?”
“SN”
The RPM4-E-DWT is serialized. The serial number can be read using this program
message.
Query sent:“SN?”
Query reply:
“321”
Sent:
“SN”
Reply:“321”
3.9.5.4
Read the next available Ready/Not Ready status.
“SR?”
“SR”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPTThe current Ready status can be read using this program message.
Possible replies:“NR”
The pressure is not ready within the limits defined by the stability criterion.
“R ”
The pressure meets the ready criteria. The status is replied when the nextpressure measurement is finished.
“OL”
The pressure of one of the active Q-RPTs has exceeded the user defined upper orlower limits.
“OP”
The pressure of one of the Q-RPTs has exceeded the Q-RPT’s maximum limits.
“ER”
An internal device failure has occurred.
Query sent:“SR?”
Query reply:
“NR”
Sent:
“SR”
Reply:“NR”“PR”, “PRR”, “HS”, “SS”, “UL”
3.1.2, 3.8.4, 3.8.4.1
Read or set the current stability limit as a % of range.
“SS% limit”“SS%?”“SS%=limit”“SS%”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPT
The stability limit in %FS of the current active range.
limit:The stability limit can be read and set as a percent of the full scale range of the Q-RPT range.
Cmd sent:“SS% .1”
Query reply:“0.10 %”(No reply from GPIB-488)
Cmd sent:“SS%? .1”
Query reply:“0.10 %”
Sent:
“SS%=.1”
Reply:“0.10 %”
ERR# 6:
The argument was invalid.
ERR# 10:Invalid or missing command suffix.
“SS”
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4. REMOTE OPERATION

SSn
PurposeCommandQuery
Classic
Optional Suffix

Arguments
Remarks
Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also
TIME
PurposeCommandQuery
Classic
Arguments
Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also
UCOEFnPurpose
Query
Classic
Optional Suffix

Remarks
Example(enhanced)
Example(classic)See Also

Read or set the current pressure stability limit.
“SS limit”“SS?”“SS=limit”“SS”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPT
The stability limit in the current pressure unit of measure.
Limit:The stability limit can be read and set as a pressure. The stability limit is used as theReady/Not Ready criteria..
Cmd sent:“SS .1”
Query reply:“0.10 psi/s”
Cmd sent:“SS? .1”
Query reply:“0.10 psi/s”
Sent:“SS=.1”
Reply:“0.10 psi/s”
ERR# 6:
The argument was invalid.
ERR# 10:Invalid or missing command suffix.
“SS%”
3.8.3, 3.1.2
Read or set the RPM4-E-DWT internal clock.
“TIME hh:mmXX”“TIME?”“TIME=hh:mmXX”“TIME”The time in a 12 hour format using a colon delimiter
hh:mm:”am” or “pm”
XX:
Cmd sent:“TIME 12:52PM”
Query reply:“12:52pm”(No reply if GPIB-488)
Cmd sent:“TIME? 12:52PM”
Query reply:“12:52pm”
Sent:“TIME=12:52PM”
Reply:“12:52pm”
ERR# 7:
Missing or improper program message argument(s).
“DATE”
3.9.5.3
To identify the coefficient used to convert 1 Pascal to the current pressure unit of measure.
“UCOEFn?”“UCOEFn”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPTThe RPM4-E-DWT handles all pressure values internally in Pascal. The coefficient replied isequivalent of 1 Pa in the current pressure unit of measure. This program message allows theuser to convert pressures
Query sent:“UCOEF?”
Query reply:“0.0010000000”
Sent:“UCOEF”
Reply:“0.0010000000”
3.7.3, 3.9.6, 7.1.1

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

UDU
PurposeCommandQuery
Classic

Default
Remarks
Example(enhanced)
Example(enhanced)
Example(enhanced)
ErrorsSee Also
ULn
PurposeCommandQuery
Classic
Optional Suffix
Arguments
Remarks

Example(enhanced)
Example(enhanced)
Example(classic)
ErrorsSee Also

Read or set the user defined pressure unit.
“UDU label, ucoef”“UDU?”“UDU=label, ucoef”“UDU”
User unit label (4 alphanumeric char maximum). It cannot be an alreadylabel:
supported unit label.
Ucoef:“User unit conversion coefficient (units/Pa).
“UDU USER,1.0”
The user defined unit must be set up with the program message prior to remote or local
selection.
Cmd Sent:“UDU MYUN, .001”
Query reply:“MYUN, 0.001000”(No reply if GPIB-488)
Cmd Sent:“UDU? MYUN, .001”
Query reply:“MYUN, 0.001000”
Sent:“UDU=MYUN, .001”
Reply:“MYUN, 0.001000”
3.9.6, 3.7.3
Read or set an upper limit for the specified or active Q-RPT.
“Uln limit”“Uln?”“Uln=limit”“ULn”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPTThe upper limit pressure in the specified Q-RPT’s current pressure unit and“limit":measurement mode.
The RPM4-E-DWT has an upper limit for each range and for each measurement mode (gauge,absolute, and differential). If the pressure does exceed the upper limit, the pressure display
flashes. This feature should always be used to prevent accidental over pressure of a device
under test.
Cmd sent:“UL 1000”
Query reply:“1000.00 kPa g”
Cmd sent:“UL? 1000”
Query reply:“1000.00 kPa g”
Sent:“UL=1000”
Reply:“1000.00 kPa g”
ERR# 6:The “limit” argument is out of range.
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4. REMOTE OPERATION

UNITn
PurposeCommandQuery
Classic
Optional Suffix

Arguments
Remarks

Example(enhanced)

Example(enhanced)
Example(classic)
ErrorsSee Also
VER
Purpose
Query
Classic
Remarks
Example(enhanced)
Example(classic)See Also

Read or set the pressure unit of measure.
“UNITn unit (, ref”)”“UNITn?”“UNITn=unit (, ref”)”“UNITn”
A suffix may be used instead of “RptLabel”“n”‘1’ Specify the Hi Q-RPT‘2’ Specify the Lo Q-RPTUnit:

The text corresponding to the pressure unit of measure.

The optional unit reference temperature only if the unit is “InWa”
ref:
This program message determines what unit of measure is used to display pressure values. Refer
to Table 7 for a detailed list of the units available and their labels.
If the unit specified is “InWa”, an optional second argument “ref” can be set. The “ref” can be 4, 20,
or 60 corresponding to InWa at 4 °C, 20 °C or 60 °F. If this second argument is not given when theunit is “InWa”, then the reference temperature is assumed to be 20 °C. This can also be added
directly onto the end of the Unit argument if desired.
The fifth character of the reply is always ‘g’ for gauge mode. White spaces precede this character
if needed. The temperature reference is added to the reply only if the unit is “InWa”.
The reply includes the measurement mode character in the fifth position, with a ‘g’ indicating gauge
mode.
“UNIT? kPag”
Cmd sent:“kPag”
Query reply:“UNIT? InWag, 4”
Sent:“inWag, 4”Query reply:“UNIT? InWag60”
Sent:“inWag, 60”
Query reply:
Cmd sent:“UNIT psi n”
Query reply:“psi g”(‘g’ used to indicate both gauge & neg gauge modes)“UNIT=kPag”
Sent:“kPag”
Reply:“UNIT=InWag, 4”
Sent:“inWag, 4”
Reply:
ERR# 7:The unit is invalid.
ERR# 6:
The ref is invalid.
3.7.3, 3.9.6, 7.1.1
Identify the RPM4-E-DWT, US or SI units, the Q-RPT labels and the software version.
“VER?”“VER”
The software version of the RPM4-E-DWT can be read. This is useful for checking for thepresence of the RPM4-E-DWT and for reference purposes. It indicates the internal Q-RPT(s) andsoftware version.
Query sent:“VER?”
Query reply:“DH INSTRUMENTS RPM4-E-DWT4 us A70M/7M Ver1.00 ”
Query sent:“VER?”
Query reply:“DH INSTRUMENTS RPM4-E-DWT us E-DWT-H A70M/7M Ver1.00 ”“ID”, “*IDN?”

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E-DWT-H OPERATION AND MAINTENANCE MANUALZOFFSETn
PurposeCommandQuery
Classic
Defaults
Optional Suffix

Arguments

Remarks

Example(enhanced)
Example(classic)
ErrorsSee Also

Read or set the AutoZ pressure offset (Poffset) for the specified or active Q-RPT.
“ZOFFSETn GaOffset , AbsOffset , DifOffset”“ZOFFSETn?”“ZOFFSETn =GaOffset , AbsOffset , DifOffset”“ZOFFSETn”“ZOFFSETn = 101325, 0.0, 0.0” Note : the AbsOffset , DifOffset are not used in this model.
The active Q-RPT is assumed if no suffix is given.
“n”‘1’ “:HI”
Specify the Hi Q-RPT‘2’ “:LO” Specify the Lo Q-RPTThe Q-RPT pressure offset (“Poffset”) for Gauge measurement mode (Pa).
GaOffset:
The Q-RPT pressure offset for absolute measurement mode (Pa)
AbsOffset:
The Q-RPT pressure offset for differential measurement mode (Pa)DifOffset:
Note : the AbsOffset , DifOffset are not used in this model.
The pressure offset (Poffset) for the specified Q-RPT (Hi or Lo) can be accessed with thisprogram message. There are separate offsets for gauge, absolute and differential
measurement modes, but this RPM4-E-DWT model does not use the “AbsOffset” or“DifOffset”.
Using this program message overwrites the current offset, so caution must be used.
Changes made using this program message take effect immediately.
Cmd sent:“ZOFFSET1 2.1, 0, 0”
Query reply:“ 97293.10 Pa, 0.00 Pa, 0.00 Pa”
Sent:“ZOFFSET=97293.1, 0, 0”
Reply:“ 97293.10, 0.00, 0.00”
ERR# 6:
One of the arguments is out of range.
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5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION

5.

Maintenance,
Adjustments andCalibration

5.1

Overview

E-DWT-H was designed for maintenance free operation. No maintenance is required other than:•

Regular AutoZeroing of quartz reference pressure transducers (Q-RPTs) (see Sections 3.9.1, 3.7.10).

•

Periodic calibration of Q-RPTs (see Section 5.3).

•

Adjustment of the on-board barometer (see Section 5.2.2).

•

Overhaul of the E-DWT-H (see Section 5.4.1).

From a maintenance, calibration and repair point of view, the RPM4-E-DWT reference pressure monitor
and the rest of the E-DWT-H are treated as separate sub-systems.

Note

5.2

•

E-DWT-H is a sophisticated pressure measuring instrument with advanced
on-board features and functions. Before assuming that unexpectedbehavior is caused by a system defect or failure, use this manual and othertraining facilities to become thoroughly familiar with E-DWT-H operation.

•

For rapid assistance in specifictroubleshooting information.

•

Unauthorized service or repair of E-DWT-H during the warranty period isundertaken at the owner’s risk and may cause damage that is not covered
under warranty and/or may void the warranty. For warranty service,contact a DHI Authorized Service Provider (see Table 19).

situations

see

Chapter6

for

RPM4-E-DWT Maintenance

The only regular maintenance of the RPM4-E-DWT is day to day zeroing of the Q-RPTs (see Section
5.2.1), regular recalibration of the Q-RPTs (see Section 5.3) and adjustment of the on-board barometer(see Section 5.2.2).

5.2.1

AutoZero of Q-RPTS

See Sections 3.9.1 and 3.7.10 for complete information on Autozeroing of Q-RPTs.
The RPM4-E-DWT should be AutoZeroed prior to running each test.
Before AutoZeroing, allow at least two minutes for full system stabilization. Be sure that thepressure applied is truly zero (i.e., the E-DWT-H TEST port is open to atmosphere).
To cause the range to Autozero, press [AutoZ].

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

5.2.2

Adjustment of the On-Board Barometer PURPOSE
To adjust the output of the on-board barometer (see Section 3.9.7.1).
 PRINCIPLE
The on-board barometer output can be adjusted using PA and PM values following the same
principles as for the Q-RPTs (see Section 5.3.1.1).
Since the on-board barometer is not a source of traceable pressure values, it does not haveto be formally calibrated. It should be offset to agree with a reference barometer. To offset
the barometer, change the barometer pressure adder (PA).

Note
The on-board barometer is used only for measuring changes inatmospheric pressure over short periods of time (see Section 3.9.1).
RPM4-E-DWT measurement uncertainty does NOT depend on the absoluteaccuracy of the on-board barometer.
 OPERATION
To view or edit the values of PA and PM for RPM4-E-DWT’s on-board barometer, press[SPECIAL], <8cal>, <3barometer>. Pressing [ENT] steps through displays of the calibration
date [YYYYMMDD] and PA and PM. In edit mode, the values can be edited. Pressing[ENT] after the last screen activates the edited values.

Note

5.3

•

To view the current output of the on-board barometer, press[SPECIAL], <7intern>, <3baro> from the main run screen.

•

A pressure standard may be connected to the on-board barometer by
connecting to one of the ATM ports on the RPM4-E-DWT rear panel
Q-RPT modules (10-32 UNF). The operating span of the barometer is
10 psi (70 kPa) to 16 psi (110 kPa).

•

Never apply a pressure greater than 110 kPa (16 psi) to the barometer
port. Overpressure and possible damage may result.

RPM4-E-DWT Q-RPT Calibration
5.3.1

Principle

RPM4-E-DWT has one or two quartz reference pressure transducers (Q-RPTs) that are thesource of low pressure measurement uncertainty for the system.
To adjust a Q-RPT, pressures from a reference standard are applied to the Q-RPT at
ascending and descending pressure increments over the range. The pressure defined by thestandard and the corresponding Q-RPT readings are recorded at each point. After all of thepressures have been applied and recorded, adjustments are made to fit the Q-RPT pressure
readings to the standard. Fitting the readings means performing a least squares linear
regression to arrive at the lowest value of the residuals of errors of the Q-RPT relative to thestandard. The Q-RPT output is adjusted by user settable coefficients: PA (an adder or offset)
and PM (a multiplier or span set) (see Section 5.3.1.1).
The calibration process is performed independently on each Q-RPT to arrive at its optimal fit.
RPM4-E-DWT is delivered with an interactive Q-RPT calibration utility (CalTool for RPTs) thatsteps the operator through the complete Q-RPT calibration procedure including applying thenecessary pressures, collecting data automatically, calculating new PA and PM values,
previewing the results of the new calibration and activating the results of the new calibration.
© 2009 DH Instruments, a Fluke Company

Page 98

5. MAINTENANCE, ADJUSTMENTS AND CALIBRATIONThe RPM4-E-DWT also provides complete front panel and remote access to Q-RPT
calibration parameters so that Q-RPT calibrations can be performed without using CalTool
software (see Section 5.3.7).

Note
CalTool for RPTs software supports the calibration process of
RPM4-E-DWT Q-RPTs. CalTool and its documentation are provided on the
General Accessories Disk which is delivered with a new E-DWT-H. CalTool
for RPTs can also be downloaded from www.dhinstruments.com. The useof CalTool software to assist in the calibration of RPM4-E-DWT is highly
recommended.

5.3.1.1

PA and PM Coefficients

The coefficients used to adjust Q-RPT readings are designated PA (an adder oroffset) and PM (a multiplier or span set). The coefficients affect the Q-RPT
reading following:
Corrected reading = (uncorrected reading • PM) + PA
PA is expressed in units of pressure (always the SI unit, Pascal).
PM is dimensionless.
Since the RPM4-E-DWT operates in gauge mode only and the Q-RPT is zeroedat the time of calibration and frequently rezeroed during calibration, PA should
not be significantly different from zero.
Each Q-RPT has its own unique PA and PM values. The PA and PM values
currently in use can be viewed and edited from the front panel in the CAL
function (see Section 5.3.6). PA and PM values are automatically edited when
CalTool software results are activated.

Note

5.3.2

•

As editing PA and PM values changes Q-RPT
calibration, they should only be edited by qualified
personnel as part of the calibration process. Caution
should be taken to avoid accidental editing, and asecurity system is available to prevent access (seeSection 3.9.5.5). Incorrect editing of PA and PM values
can cause out of tolerance measurements.

•

A new RPM4-E-DWT is delivered with PA and PM values
set to zero and 1 for all Q-RPTs. This does not mean that
the RPM4-E-DWT has not been calibrated. In the original
factory calibration, privileged factory coefficients areused for calibration with the user PA and PM set to zeroand 1.

Equipment Required
Note
The recommended calibration standard for the E-DWT-H RPM4-E-DWT
Q-RPTs is a DHI PG7302 piston gauge. Contact DHI for additional
information.

Page 99© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUALOil operated piston gauge (deadweight tester), with the following characteristics:•

Measurement uncertainty of ± 0.005 % of reading or better. A standard with higher
measurement uncertainty may be used but RPM4-E-DWT measurement uncertainty
may be degraded proportionally from normal specifications.

•

Able to supply the recommended sequence of pressure points in the range to becalibrated: See Section 5.3.4 for information on the recommended calibration point
sequence.

5.3.3

Set-Up and Preparation

To set-up and prepare the RPM4-E-DWT for calibration of its Q-RPTs:

Note
THE RPM4-E-DWT SHOULD NOT BE REMOVED FROM THE E-DWT-H
BRACKET FOR CALIBRATION. THE RPM4-E-DWT SHOULD ONLY BE
REMOVED FROM THE E-DWT-H BY A QUALIFIED SERVICE CENTER.
Set the E-DWT-H on a stable surface near the calibration standard with it’s reference level(TEST port) as close as possible to the calibration standard’s reference level. Consider thehigh pressure connection that needs to be made to the TEST port on the top of the E-DWT-H
and access to the front panel display, keypad and Lo Q-RPT shut off valve.
Connect the calibration standard output to the E-DWT-H top or rear TEST port. The TEST port
connection is DH500 F (DH500 F: gland and collar type fitting for coned and left handthreaded 1/4 in. OD tube, equivalent to AE F250C, HIP HF4, etc.). Plug the other test port.
In dual Q-RPT E-DWTs, the E-DWT-H TEST port connects to BOTH of the RPM4-E-DWT QR-RPTs (see Figure 11).

W Caution
If the RPM4-E-DWT has two Q-RPTs, take care to avoid overpressure of the
Lo Q-RPT. The E-DWT-H TEST port connects to both the Lo and the Hi
Q-RPTs. Use the Lo Q-RPT shut off valve on the E-DWT-H front panel toisolate the Lo Q-RPT when applying pressure to the Hi Q-RPT (see Section
3.4). If the RPM4-E-DWT is removed from the E-DWT, note that the
RPM4-E-DWT has separate Lo and Hi TEST(+) ports, one for each Q-RPT.
Exposing the Lo Q-RPT to pressure greater than its maximum working
pressure may damage it beyond repair. The product warranty does notcover Q-RPT damage due to overpressure.

5.3.4

Recommended Calibration Point Sequence

Calibration adjustments to E-DWT-H RPM4-E-DWT Q-RPTs are made by altering calibration
coefficients, PA and PM (see Section 5.3.1.1). To adjust these coefficients to optimum
values giving the best results over the Q-RPTs’ complete operating range, the specificcalibration point sequence defined in Table 16 is recommended.
All calibration pressures are gauge pressures.
Prior to running the calibration point sequence, the Q-RPT should be exercised:a) Set full scale pressure.
b) Dwell at full scale pressure for 5 minutes.
c) Return to atmospheric pressure (vented).
d) Dwell for ten (10) minutes.
A dwell time of 60 seconds is recommended before taking data at each pressure increment.

© 2009 DH Instruments, a Fluke Company

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5. MAINTENANCE, ADJUSTMENTS AND CALIBRATIONNote
It is not necessary for the calibration pressure standard to apply precisely
the nominal pressure value of each calibration point as long as the exact
value of the applied pressure is known. Best results are obtained if theactual applied pressure is within 5 % of the recommended nominal point.
Table 16. Calibration point sequence for E-DWT-H RPM4-E-DWT Q-RPTs
CALIBRATIONSEGMENT

Ascending

Descending

POINT
NO.
1
2
3
4
5
6
7
8
9
10
11

POINT
[% OF SPAN]
0%*
10 %
25 %
50 %
75 %
100 %
75 %
50 %
25 %
10 %
0%*

* AutoZ the RPM4-E-DWT with reservoir shut off valve close, TEST shut off valve open, top
TEST1 port open.

5.3.5

RPT Calibration Using CalTool for Q-RPTS Software

To calibrate RPM4-E-DWT Q-RPTs using CalTool software, refer to Sections 5.3.1, 5.3.2,
5.3.3 and 5.3.4 in this manual and then refer to the CalTool for Q-RPTs Software Manual.
CalTool for Q-RPTs software and manual are supplied on the General Accessories Disk andcan be downloaded from www.dhinstruments.com.

5.3.6

Editing and Viewing Q-RPT Calibration Information

 PURPOSE
View and/or edit Q-RPT calibration information fields including:

The calibration date – This field is normally used to record the date on which the
Q-RPT is calibrated.



The value of absolute mode AutoZero Poffset – Always 0 Pa.
RPM4-E-DWT A70M/A7M-AF.



The value of PA – The pressure adder for the selected Q-RPT (see Section 5.3.1.1).



The value of PM – The pressure multiplier for the selected Q-RPT (see Section 5.3.1.1).

Not used in OPERATION

Note

As editing PA and PM values will change the calibration of the Q-RPTs,
the edit function should only be used by qualified personnel as partof the calibration process. Caution should be taken to avoid
accidental editing. A user level security system is available to control
access (see Section 3.9.5.5).

A new RPM4-E-DWT is delivered with PA and PM values set to zeroand 1 for all ranges. This does not mean that the RPM4-E-DWT has notbeen calibrated. In the original factory calibration, privileged factorycoefficients are used for calibration with the user PA and PM set tozero and 1.

Page 101© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

To access Q-RPT calibration information viewing or editing press [SPECIAL], <8Cal>.
Select the desired Q-RPT. The <1view> selection displays the calibration information fields.
The <2edit> function displays the fields and allows them to be edited. The display is:1.

Date of last calibration in YYYYMMDD format.

2.

Position designator of the Q-RPT being viewed.

3.

Current
value
ofabsolute
mode
Poffset.
Not used in this RPM4-E-DWT model. Always 0.0 Pa.

Cal date:20030325 Hi
AbsPoffset: 0.0 Pa

If in edit mode, the calibration information fields can be edited. Pressing [ENT] on the last
field goes to the next view/edit screen:

1.

Value of PA.

2.

Position designator of the Q-RPT being viewed.

3.

Value of PM.

PA: 0.0 Pa
PM: 1.000000

Hi

If in edit mode, the calibration fields can be edited. Pressing [ENT] on the <PM> field in viewmode returns to the view/edit screen. [ENT] in edit mode goes to confirmation of change
activation if changes have been made in any of the calibration screens. Pressing [ESC] in any edit
screen exits the edit screen without activating any changes.

Note
The value of PA is always in Pascal (Pa).
dimensionless.

5.3.7

The value of PM is

Q-RPT Adjustment Without CalTool for Q-RPTS
Software PRINCIPLEThe RPM4-E-DWT Q-RPTs can be adjusted without using CalTool for Q-RPTs software.
This requires:•

Zeroing the RPM4-E-DWT.

•

Applying pressures with a calibration standard and recording the pressures
measured by RPM4-E-DWT.

•

Calculating new PA and PM values and entering them.

W Caution
Before proceeding to adjust a Q-RPT without using CalTool for Q-RPTs
software, Sections 5.3.1, 5.3.2, 5.3.3 and 5.3.4.
 OPERATION
The typical procedure for adjusting a Q-RPT is:
Set-up and prepare the RPM4-E-DWT for calibration (see Sections 5.3.2, 5.3.3).
Use the [RANGE] function key to select the Q-RPT to be calibrated (see Section 3.7.2).
Be sure to set the DF range (not an AutoRanged range).
Use [HEAD] to set the HEAD to zero (see Section 3.7.8). Use [UNIT] to set the desiredpressure unit of measure (see Section 3.7.3).
© 2009 DH Instruments, a Fluke Company

Page 102

5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION

Use [SPECIAL], <8cal>, <1Hi Q-RPT > or <2Lo Q-RPT >, <1edit>, to read and record
the current values of PA and PM for the Q-RPT to be calibrated.
AutoZ the RPM4-E-DWT with the reservoir shut off valve close, TEST shut off valve open
and open to atmosphere at the E-DWT-H TEST port.
Run the recommended calibration point sequence for the Q-RPT (see Section 5.3.4).
Record the pressure applied by the standard and the RPM4-E-DWT reading at eachcalibration point. Dwell at least 60 seconds at each point after setting the reference
pressure to allow full stabilization.
Enter the calibration pressures and RPM4-E-DWT readings into a spreadsheet.
Calculate the “non-corrected” RPM4-E-DWT readings by backing out the PM recorded in
Steps above, following:
non-corrected reading = corrected reading/PM [Note: PA should be 0]
Perform a linear regression to find the offset and slope that best fit the non-corrected
RPM4-E-DWT readings to the calibration standard pressures. The offset is the newvalue of PA, the slope is the new value of PM. If the RPM4-E-DWT was AutoZeroed
properly to calibration, HEAD was set to zero and the pressures from the calibrationreference were properly adjusted to the RPM4-E-DWT reference level (TEST port), thevalue of PA should be very close to zero.
Press [SPECIAL], <8Cal>, <1Hi Q-RPT > or <2Lo Q-RPT >, <2edit> and write the new
calibration date and the new values of PA and PM for the Q-RPT calibrated (see Section
5.3.6).
Calculate as left data for the calibration if desired following:as left reading = non-corrected reading • new PM[Note: PA should be 0]

Perform additional verification pressure runs as desired.

5.4

E-DWT Maintenance
There are no E-DWT-H maintenance procedures other than the overhaul procedure.

5.4.1

E-DWT Overhaul

E-DWT-H is generally overhauled as one common assembly. Removal of RPM4-E-DWT fromthe E-DWT-H is not recommended.
Any or all of the following items may be included as part of an E-DWT-H overhaul:•

Check that RPM4-E-DWT rear panel mounted cooling fan operates when RPM4-EDWT is powered.

•

Clean and inspect E-DWT-H TEST port connection.

•

Purge and clean reservoir and internal hydraulic circuit. Replace used oil with clean oil.

•

Check that internal fittings, screws, bolts and nuts are tight.

•

Perform system leak and operational check.

•

If the RPM4-E-DWT has two Q-RPTs, check Lo Q-RPT pressure relief valve forproper operation. See correct relief valve cracking pressure in Section 1.2.1. Do not
apply pressure greater than 110% of the to the RPM4-E-DWT Lo Q-RPT maximum
working pressure as it may be damaged beyond repair. The RPM4-E-DWT warranty
does not cover damage due to Q-RPT overpressure.

•

Clean RPM4-E-DWT and E-DWT-H front panel.

Page 103© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL•

Verify that RPM4-E-DWT internal barometer reads atmospheric pressure within± 0.15 psi (1 kPa). Adjust if necessary (See Section 5.2.2).

•

Perform calibration of quartz reference pressure transducers (Q-RPTs), if necessary(see Section 5.3)

5.4.2

Reloading Embedded Software into RPM4-E-DWT
Flash Memory

RPM4-E-DWT uses FLASH memory. This allows the embedded software that controls
RPM4-E-DWT operations and functions to be loaded into RPM4-E-DWT over its COM1 port
from a computer with a simple FLASH loading utility program.
To replace corrupted software or upgrade your software, access the DHI web site atwww.dhinstruments.com and go to SOFTWARE. A FLASH loading utility and the latest
RPM4-E-DWT software are available for download at no charge. If you do not have accessto the web or have difficulty downloading or loading software, contact your DHI representative
or a DHI Authorized Service Provider (see Table 19) for assistance.
If you believe you have discovered an error or “bug” in RPM4-E-DWT software, please report
it with complete details by email to cal.repair@dhinstruments.com.

Note
The DHI flash software loading utility and RPM4-E-DWT embedded
software are available for download from www.dhinstruments.com in the
SOFTWARE section.

5.4.3

Filling E-DWT-H with Calibration Fluid and Purging Air
Using the Optional Fill Kit
Note
A standard E-DWT-H is delivered already filled and primed with Sebacate
calibration fluid and should not need additional filling and priming before
use. E-DWT-H for use with a fluid other than Sebacate is delivered empty
and will need to be filled and primed before use.

A standard E-DWT-H is delivered already filled and primed with Sebacate calibration fluid
and should not need additional filling and priming before use. E-DWT-H for use with a fluid
other than Sebacate is delivered empty and will need to be filled and primed before use.
This procedure is necessary only for an E-DWT-H delivered empty of calibration fluid, for use
with a calibration fluid other than Sebacate or if the E-DWT-H has been emptied and purgedof fluid.
To fill and purge an E-DWT-H with calibration fluid using the optional fill kit, proceed asfollows:

Note
FILL KIT NOT AVAILABLE AT THE TIME OF RELEASE OF THIS VERSION
OF THIS MANUAL© 2009 DH Instruments, a Fluke Company

Page 104

5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION

5.4.4

RPM4-E-DWT Subassembly Description and Location

A Micro card
D Lo Q-RPT module (optional)
B Driver Board
E Hi Q-RPT module
C On-Board Barometer F Display
Figure 15. RPM4-E-DWT internal view

5.4.4.1

Micro Board

The micro board supports a Motorola 68302 micro-controller, EPROM,
EEPROM, 128k x 16 bit NVRAM, 8 Mbit flash memory; RS-232 and IEEE-488.2
communications; keypad and display control. An I/O port controls other ports
and devices in RPM4-E-DWT.

5.4.4.2

Driver Board

The driver board is controlled by the micro board (see Section 5.4.4.1). It
supports:•

Frequency counters (2) for reading Q-RPTs (see Section 5.4.4.4)•

On-board barometer power and output (see Section 5.4.4.3)•

Power to the system cooling fan•

Remote [ENT]•

Keypad and display•

BeeperPage 105© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

5.4.4.3

On-Board Barometer

The on-board barometer supports a board mounted, barometric range, micro
machined silicon sensor and an ambient temperature sensor. The barometerreadings are used for dynamic atmospheric pressure compensation whenmeasuring gauge pressure with an absolute quartz reference pressuretransducer (see Section 3.9.1). The temperature sensor is used for temperaturecompensation of the barometric sensor.

5.4.4.4

Q-RPT Module

The Q-RPT module is an integrated Quartz Reference Pressure Transducer(Q-RPT) assembly. The module includes a Q-RPT, brackets to hold thetransducer, interconnecting tubing and a manifold with TEST(+)and ATM ports.
A Q-RPT provides very high precision, low uncertainty pressure measurement. The
basic sensing principle is the measurement of the change in the natural oscillating
frequency of a quartz tuning fork in response to changes in temperature andmechanical stress resulting from the change in pressure applied to a connecting
bellows or bourdon tube. Two independent quartz elements are used. One quartz
element is subjected to pressure related stress. The other quartz element is used
only to monitor temperature. See Section 1.2.3.1 for Q-RPT specifications.
See Section 5.4.5, Figure 16 for a pneumatic schematic of the Q-RPT module
configuration.
HI Q-RPT MODULE
The RPM4-E-DWT Hi Q-RPT may be any range from A7M to A200M (see Section
1.2.3, Table 1), providing a maximum pressure of up to 200 MPa (30 000 psi).
LO Q-RPT MODULE
The Lo Q-RPT module is optional. If included, it may be any range from A7M to
A40 M. (see Section 1.2.3, Table 1), providing a maximum pressure of up to 40
MPa (6 000 psi).

5.4.4.5

Display2 x 20 character vacuum fluorescent display.

5.4.4.6

Cooling Fan

The cooling fan is mounted on the RPM4-E-DWT rear panel and connected tothe main board. It is a 12V brushless DC fan.

5.4.5

Hydraulic Schematic of Q-RPT Module

Figure 16. Hydraulic schematic RPM4-E-DWT Q-RPT Module© 2009 DH Instruments, a Fluke Company

Page 106

6. TROUBLESHOOTING

6.

Troubleshooting

RPM4-E-DWT is a sophisticated pressure generating, setting and measuring instrument with advanced
on-board features and functions. Before assuming that unexpected behavior is caused by a systemdefect or breakdown, the operator should use this manual and other training facilities to become
thoroughly familiar with RPM4-E-DWT operation. This troubleshooting guide is intended as an aid in
identifying the reason for RPM4-E-DWT behavior and determining whether the behavior is normal operationor due to an internal or external problem.
Identify the symptom or unexpected behavior you are observing from the SYMPTOM list below.
A PROBABLE CAUSE is provided and a SOLUTION is proposed including references to manual
sections that provide information that may be of assistance.
Table 17. Troubleshooting guide
SYMPTOMPROBABLE CAUSE

Cannot access certain functions>ACCESS RESTRICTED<

User level has been set that restricts accessto certain functions.

Change user level or consult systemmanager. 3.9.5.5

Displays <FATAL ERROR> or<FATAL FAULT>.

Encountered unresolved internal software
conflict.

Cycle power to clear. Please record
conditions leading up to event including
the numbers displayed when [ENT] ispressed and report to your DHI
Authorized Service Provider. Table 19

Front panel keys seem to bedisabled.

”remote” command has been sent from ahost computer.

Send ”local” command from hostcomputer or cycle RPM4-E-DWT power.
4, 4.4.4

Measured pressure display orother displays have too much/not
enough resolution.

Resolution setting needs to be changed.

Change resolution setting using theresolution function, using AutoRange orby initializing an AutoTest. 3.8.2, 3.7.5,
3.7.11Can’t increase resolution to level
desired in AutoRanged range.

Resolution setting is limited when
AutoRanging under 10 % of Q-RPT default
range.

Operation is normal. 3.7.5, Table 5

Values that should be non-zero
are displayed as zero.

Resolution setting needs to be increased toview significant digits.

Change resolution setting. 3.8.2

Keypad presses make undesired
sounds or NO sounds.

Keypad sound settings need to be made.

Use SOUND function to set keypadsounds as desired. 3.9.5.2

Bottom line of display haschanged and you want to change
it back.

The DISPLAY function has been used tochange the display.

Use [DISPLAY] to set bottom line todesired display. 3.7.7

Bottom line of display is blank.

DISPLAY mode is “clean”.

Use [DISPLAY] to change bottom line
display if desired. 3.7.7

The pressure units available
under the [UNIT] function key are
not those desired.

UNIT function needs to be customized.

Use Punit function to customize the UNIT
function or reset units to default.
3.9.6, 3.9.9.2

Front panel display is dim.

Screen saver option has activated.

Operation is normal. Press any key toresume full screen power. Adjust screen
saver time, if desired. 3.9.5.1

AutoRange is not selecting thedesired Q-RPT for the specified
range.

The Q-RPT range does not cover the
specified AutoRange full scale pressure.

Check that Q-RPT default range is highenough to cover the AutoRange. 1.2.3.1

Pressure display is flashing andbeeper is sounding intermittently.

Current upper limit of active range has been
exceeded.

Reduce pressure. Change UL and/orchange active range using [RANGE],[AUTORANGE] or AutoTest. 3.8.4,
3.7.5, 3.7.11

Page 107

SOLUTION© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUALSYMPTOM“Hi (or Lo) Q-RPT EXCEEDEDPMAX” displays alternating withnormal display.

PROBABLE CAUSESOLUTION

RPM4-E-DWT Q-RPT has been
overpressured (Pmax! exceeded).

Correct the overpressure condition andcycle power ON and OFF to clear.
Q-RPT may be damaged. 3.8.4.1

Display is<!!!LO RPT ACTIVE!!!>the E-DWT-H CAUTION LO RPTACTIVE light is flashing and
RPM4-E-DWT is beeping.

The Lo Q-RPT is receiving pressure but the
Hi Q-RPT is currently selected.

Since the Hi Q-RPT is selected on
RPM4-E-DWT, the Lo Q-RPT should beshut off by the Lo Q-RPT shut off valve.
Reduce pressure and close the
Lo Q-RPT shut off valve or select the Lo
Q-RPT on the RPM4-E-DWT. Do not
apply more than 1 000 psi (7 MPa) to
the Lo Q-RPT. 3.4

A Ready (green Ready/Not Ready
indicator) indication is neverachieved.

Stability settings is too tight and/or existing
conditions will not allow Ready to beachieved.

Adjust stability setting or correct otherconditions. Consider using an AutoTest to
set stability appropriately. 3.8.3, 3.1.2,
3.7.11

Display update rate of indicatedpressure changes when changing
pressure.

RPM4-E-DWT automated read rate function
is ON to automatically adjust read ratedepending upon rate of change of pressure.

Operation is normal. Turn automatedread rate function OFF if desired. 3.9.7.2

Display update of indicatedpressure is too slow whenpressure is changing quickly.

RPM4-E-DWT automated read rate functionis OFF.

Turn automated read rate function ON toautomatically adjust read rate depending
on pressure rate of change. 3.9.7.2

Pressure is changing but displayof pressure is NOT and thebottom right hand corner of thedisplay is a numerical countdown
followed by <avg>.

Average DISPLAY function is ON andpressure display is updating only with theaverage value at the end of each averaging
cycle.

Go to a DISPLAY function other than
average or press [+/-] to get the
instantaneous value Average DISPLAY.
3.7.7, 3.7.7.1

These is a leak in the pressure system towhich E-DWT-H is connected.

Find and correct leak. Consider using
RPM4-E-DWT leak check function. 3.7.6

The pressure applied to the RPM4-E-DWT
has recently been changed and the pressure
is still stabilizing.

The time it takes for pressure to stabilize
after making a pressure change
increases with the size of the pressurechange and size of the test volume. Up
to three minutes or more can be requiredfor pressure to stabilize within 0.01% of
the measured pressure

The RPM4-E-DWT display resolution ishigher than is necessary and you areobserving normal evolution of the pressure(Note: if viewed with enough resolution,pressure is NEVER perfectly stable).

Use the resolution setting function,
AutoRange or AutoTest to reduce
resolution to a level that is appropriate
for the test being run or the uncertainty ofthe device being calibrated. 3.8.2, 3.7.5,
3.7.11

Disagreement between two Q-RPTs
in system appears excessive.

Difference is actually within tolerance andacceptable disagreement.

Compare differences observed totolerances on Q-RPT measurements.
1.2.3.1

Apparent inaccurate pressure
control/measure and little or no
response from Q-RPT:

Reference transducer destroyed byoverpressure.

Contact DHI Authorized Service Provider.
Table 19

Incorrect pressure units.

Set desired pressure. Consider reference
temperature if unit is inWa. 3.7.3

Q-RPT calibration coefficients have beenaltered.

Check and correct calibration coefficients ifneeded. 5.2.2

RPM4-E-DWT has not been AutoZeroed or
had been AutoZeroed incorrectly.

Run AutoZ correctly. 3.9.1

An unplanned “head” correction is active orhead height or fluid is incorrect.

Operation is normal. Remove or change“head” correction. 3.7.8

A head correction is applied and current
indication is the value of the head.

Operation is normal. 3.7.8, 3.9.1

Pressure indicated by
RPM4-E-DWT never becomesstable.

Apparent inaccurate pressure
measurement.

Apparent inaccurate pressure
measurement and <h> isdisplayed on top line of screen.
AutoZ was just run but
measurement indication is NOT
zero. <h> is displayed on top lineof screen.

© 2009 DH Instruments, a Fluke Company

Page 108

6. TROUBLESHOOTINGSYMPTOMPROBABLE CAUSE

Pressure applied is zero gauge
but reading is NOT zero.

Is NOT reading pressure applied
to the Lo Q-RPT.
Is NOT reading pressure applied
to RPM4-E-DWT TEST port.

Need to run AutoZ to rezero in gauge mode.

Run AutoZ. 3.7.10

Reservoir shut off and or TEST shut off valve
are not open so back pressure is trapped in
E-DWT-H or in TEST system.

Open reservoir shut off and TEST shutoff valves. 3.5

Reservoir cap vent valve is closed soreservoir is not open to atmosphere.

Open reservoir cap vent valve. 3.5

E-DWT Lo Q-RPT Shut Off Valve is closed
shutting off the Lo Q-RPT from the E-DWT-HTEST port.
TEST shut off valve is closed.

TEST shut off valve is closed.

Reservoir shut off valve is open.
Cannot generate pressure withvariable volume.
Too much air in test system to which
E-DWT-H is connected.

It takes too long to generate thefirst pressure. Need to refill thevariable volume multiple times.

Reservoir priming pump will notgenerate pressure.
[ENT] is not accessing
AutoTest function.

the

SOLUTION

Reservoir empty. No oil in variable volume.
Too much air in test system to which
E-DWT-H is connected or test volume toolarge.

Reservoir cap not installed, tip of pump is too
far from reservoir seat.
Reservoir empty.
Reservoir shutoff valve closed.
You are in a Display mode that uses the[ENT]. Display mode must be Rate or Clean
for [ENT] to access AutoTest.

Page 109

Familiarize yourself with the E-DWT-H
schematic and operation. Open the Lo
Q-RPT Shut Off Valve. 3.4
Familiarize yourself with your E-DWT-H
schematic. Open TEST shut off valve.
3.5
Familiarize yourself with your E-DWT-H
schematic. You are generating pressure
but are not connected to the TEST port.
Open TEST shut off valve. 3.5
Familiarize yourself with your E-DWT-H
schematic. Close reservoir shut off valve.
3.5
The test system must be filled with oiland primed before pressure can begenerated. Fill and prime the test
system. 3.5
Fill reservoir. 3.5
The test system must be filled with oiland primed before pressure can begenerated. Fill and prime the test
system before starting the test. If thetest volume is too large, consider prefilling with external means. 3.5
Rotate reservoir cap CW until cap ventvalve is at CLOSE indicator (do not overtighten).
Refill reservoir.
Open reservoir shut off valve. 3.5
Press [DISPLAY] and set the Display
mode to Rate or Clean. 3.7.7.2© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

Notes© 2009 DH Instruments, a Fluke Company

Page 110

7. APPENDIX

7.

Appendix

7.1

Unit Conversion
7.1.1

Pressure

RPM4-E-DWT performs all internal calculations in SI units. Numerical values input or output
in other units are converted to SI immediately after entry and back to other units just before
output as needed.
Table 18 provides the conversion coefficients used by RPM4-E-DWT to convert numericalvalues expressed in SI units to corresponding values expressed in other units.
Table 18. Pressure unit of measure conversion coefficients
TO CONVERT FROM Pa To

MULTIPLY BY

Pa

Pascal1.0

Mbar

millibar

1.0 E-02

hPa

hecto Pascal

1.0 E-02

kPa

kilo Pascal

1.0 E-03

BarBar

1.0 E-05mmWa @ 4°C

millimeter of water

1.019716 E-01

mmHg @ 0°C

millimeter of mercury

7.50063 E-03

Psi

pound per square inch

1.450377 E-04

Psf

pound per square foot1.007206 E-06

inWa @ 4°C

inch of water

4.014649 E-03

inWa @ 20°C

inch of water

4.021732 E-03

inWa @ 60°F

inch of water

4.018429 E-03

inHg @ 0°C

inch of mercury

2.953 E-04

kilogram force per centimeter square

1.019716 E-05

mTorr

milliTorr (micron of mercury

7.50063

Torr

Torr (millimeter of mercury)7.50063 E-3

User

User

User defined coefficientkcm

2Page 111© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

Notes© 2009 DH Instruments, a Fluke Company

Page 112

8. WARRANTY

8.

Warranty

8.1

Overview

Except to the extent limited or otherwise provided herein, DH Instruments, a Fluke Company warrants
for one year from purchase, each new product sold by it or one of its authorized distributors, only against
defects in workmanship and/or materials under normal service and use. Products which have beenchanged or altered in any manner from their original design, or which are improperly or defectively
installed, serviced or used are not covered by this warranty.
DH Instruments and any of its Authorized Service Providers’ obligations with respect to this warranty are
limited to the repair or replacement of defective products after their inspection and verification of such
defects. All products to be considered for repair or replacement are to be returned to DH Instruments or
its Authorized Service Provider after receiving authorization from DH Instruments or its Authorized
Service Provider. The purchaser assumes all liability vis a vis third parties in respect of its acts oromissions involving use of the products. In no event shall DH Instruments be liable to purchaser for any
unforeseeable or indirect damage, it being expressly stated that, for the purpose of this warranty, suchindirect damage includes, but is not limited to, loss of production, profits, revenue, or goodwill,
even if DH Instruments has been advised of the possibility thereof, and regardless of whether suchproducts are used individually or as components in other products.
Items returned to DHI under warranty claim but determined to not have a defect covered under warranty
or to not have a defect at all are subject to an evaluation and shipping charge as well as applicable repair
and/or calibration costs.
The provisions of this warranty and limitation may not be modified in any respect except in writing signed
by a duly authorized officer of DH Instruments.
The above warranty and the obligations and liability of DH Instruments and its Authorized Service
Providers exclude any other warranties or liabilities of any kind.
Table 19. DHI Authorized Service Providers
DH INSTRUMENTS, A FLUKE COMPANYAUTHORIZED SERVICE PROVIDERSCOMPANYTELEPHONE,
FAX & EMAILADDRESSNORMAL SUPPORTREGION

DH Instruments, a Fluke
Company

4765 East Beautiful Lane
Phoenix AZ 85044-5318
USA

Tel 602.431.9100
Fax 602.431.9559
cal.repair@dhinstruments.com

Worldwide

Minerva Meettechniek B.V.

Chrysantstraat 1
3812 WX Amersfoort
the NETHERLANDS

Tel (+31) 33.46.22.000
Fax (+31) 33.46.22.218
info@minervaipm.com

European Union

Ohte Giken, Inc.
Technology Center

258-1, Nakadai
Kasumigaura-machi,
Niihari-Gun,
Ibaraki 300-0133

Tel 81/29.840.9111
Fax 81/29.840.9100
tech@ohtegiken.co.jp

Japan/Asia

Page 113© 2009 DH Instruments, a Fluke Company

E-DWT-H OPERATION AND MAINTENANCE MANUAL

Notes© 2009 DH Instruments, a Fluke Company

Page 114

9. GLOSSARY

9.

Glossary
Active Q-RPTThe Q-RPT that is currently selected to be displayed on the top line of the
RPM4-E-DWT display. Most function selections affect the active Q-RPT.

AutoRange

A function that optimizes RPM4-E-DWT measurement and control for a specific, user
defined range of operation.

AutoRanged Range

An RPM4-E-DWT pressure measurement range created using the AutoRange function.

AutoTest or ATest

RPM4-E-DWT on-board automated testing sequences and their results.

AutoZero or AutoZ

A process by which a Q-RPT is rezeroed (offset) relative to a standard.

Barometer

RPM4-E-DWT’s on-board atmospheric pressure measuring sensor. Also referred to as on-board
barometer.

CCW

Counter clockwise.

CW

Clockwise.

Default Range (DF)A Q-RPT’s maximum range that is always available using [RANGE] and cannot be deleted.

Deviation

A DISPLAY function in which the deviation of the current pressure from a target pressure
is displayed.

DUT

Device Under Test.
The device or devices pneumatically connected to the
RPM4-E-DWT TEST(+) port that the RPM4-E-DWT is being used to test or calibrate.

FS

Abbreviation of “full scale”. The full scale value is the maximum pressure of a measurement
range. Limits and specifications are often expressed as % FS. Also see span.

Gauge Mode

Measurement mode in which the Q-RPT indicates gauge pressure (difference fromatmospheric pressure), but only in the positive direction (above atmosphere).

Head

A difference in height between the RPM4-E-DWT reference level and the DUT.

HiLo

A DISPLAY function in which the highest and lowest pressure measurements since
reset are recorded and displayed.

Hi Q-RPTThe designation of a single Q-RPT in an RPM4-E-DWT, or, if there are two, the one thathas the highest full scale default range. This is the A70M (10 000 psi) in the
RPM4-E-DWT A70M/A7M-AF.

E-DWT

Electronic deadweight tester. A pressure calibration system in which the traditional
piston-cylinder and mass set of a deadweight tester are replaced with an electronic,transducer based reference pressure monitor (RPM4-E-DWT).

Inactive Q-RPTIn an RPM4-E-DWT with two Q-RPTs, the Q-RPT that is not currently displayed on the
top line of the display. The inactive Q-RPT may be displayed on the second line of the
RPM4-E-DWT display using the Q-RPT DISPLAY function.

Lo Q-RPTThe designation of a the Q-RPT with the lower full scale default range in RPM4-E-DWTs
with two Q-RPTs. This is the A7M (1 000 psi) in the RPM4-E-DWT A70M/A7M-AF.

PoffsetThe difference between a Q-RPT reading and the AutoZero reference at the time AutoZ
is run. Used by the AutoZ function to compensate Q-RPT readings for zero drift overtime.

Pstd,0AutoZero reference value. Atmospheric pressure (zero gauge) for RPM4-E-DWT
A70M/A7M-AF.

PA

Pressure adder, used to offset a Q-RPT or barometer to calibrate it.

PM

Pressure multiplier, used to adjust span of a Q-RPT or barometer to calibrate it.

Pmax!

The maximum pressure limit of a Q-RPT. If the pressure measured by the Q-RPT
exceeds Pmax!, an overpressure condition occurs.

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E-DWT-H OPERATION AND MAINTENANCE MANUAL

Q-RPT(Quartz Reference
Pressure Transducer)

The transducer used by the RPM4-E-DWT for low uncertainty pressure measurement.
May be designated as Hi or Lo depending on its position and role in the RPM4-E-DWT.
Q-RPTs are designated by a leading A, G or BG (absolute, gauge or bi-directional
gauge) followed by three numbers and a letter indicating the maximum range of the
Q-RPT in kPa (nnnK) or MPa (nnnM).

Rate

A DISPLAY function in which the rate of change of pressure in pressure unit/second isdisplayed.

Ready/Not Ready

Front panel LED indication of when the pressure measured by RPM4-E-DWT’s active
Q-RPT is stable within the stability limit. Leading character of the second line when theinactive Q-RPT is displayed on the second line in Q-RPT DISPLAY mode.

RPT2x

Parallel measurement mode in which both Q-RPTs of an RPM4-E-DWT with two
Q-RPTs are used together and the indicated pressure is the average of theirmeasurements.

SDS (Self Defense
System)A system to protect Q-RPTs from overpressure made up of isolation and vent valves
and internal operating logic. SDS is not used in RPM4-E-DWT A70M/A7M-AF.

Span

The difference between FS and the lowest point in a range. For example, the span of a
100 kPa FS range in negative gauge mode is nominally 200 kPa (from - 100 kPa to 100 kPa).

Stability Limit

A limit expressed in units of pressure per second (e.g., kPa/second). The stability limit is usedas the Ready/Not Ready criterion. Ready if rate of change is less than stability limit.
Not Ready if rate of change is greater than stability limit.

Target

The value from which deviations are measured in the Deviation DISPLAY function.

UL (Upper Limit)

A user settable maximum pressure limit. When pressure exceeds UL, RPM4-E-DWT beeps
intermittently. In negative gauge measurement mode, there is also a user settable lower limit.

User Level

Levels of security that can be set to protect certain RPM4-E-DWT functions from being
accessed.

QDUT

On-board automated test sequence that AutoRanges RPM4-E-DWT based on
characteristics of the Device Under Test (DUT).

© 2009 DH Instruments, a Fluke Company

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