AS2503／AS2603
DC BRIDGE SYSTEM
DYNAMIC STRAIN AMPLIFIERS

INSTRUCTION MANUAL

1WMPD4003356

DC BRIDGE SYSTEM
DYNAMIC STRAIN AMPLIFIERS
AS2503／AS2603
OPERATION MANUAL

Cautions- Read this manual carefully before using this product.
- Place this manual within reach of the AS series amplifier.

INTRODUCTION▲Before Using▼Thank you for your purchase of our product strain amplifier AS2503/AS2603. Please read thismanual carefully before operating this instrument.

This manual provides the information necessary to operate the instrument safely. This manual
covers basic functions and operations of the AS series amplifiers and handling precautions. Place
this manual within reach of the AS series amplifier. If you encounter any problem in the manual,please contact our sales representative.

▲Examining Contents in Package▼
If opening the package in a warm room during the cold season, open the package after it hasreached room temperature to avoid any operational failure due to condensation on the surfaceof the product.
The warranty does not apply for the case where damages or faults caused by use against
instructions, warnings, or cautions.

This instrument is delivered after a thorough examination at the factory prior to shipment.
However, please examine the product's condition and verify that no obvious shipping damage
has occurred after opening the package. Also, examine the specifications of the input units andaccessories. If there are any missing or damaged items, please contact our sales
representative.

▲Cautions▼ The contents of this manual are subject to change without notice.
 This manual is copyrighted with all rights reserved. No parts of this manual may betranscribed or reproduced without written permission.
 Please let us know if there are any points that are unclear or missing in this manual.
 We do not assume any responsibility for the outcome of the use of the AS series amplifier.

１

PRECAUTIONS
Observe the following warning and cautions when using amplifiers. The warranty does not
apply any damage caused by the use against instructions, warnings, and cautions. To
safely use the amplifiers, the following statements are used in this manual to call thereaders' attention.

WARNING
This indicates a condition or practice that could result in personal injury or loss of life, andmeasures and instructions to avoid such conditions.

CAUTION
This indicates a condition or practice that could result in damage to the instrument or otherproperty and general cautions that users must take into consideration.

２

WARNING Power Supply
Make sure that the power supply is within the rating. If any voltage exceeding the rated voltage were
supplied, there would be risk of damage to this amplifier, or even a fire. Also, in order to prevent
electric shock and hazards such as a fire, be sure to use only the AC power cable supplied with thisamplifier.

 Protective Grounding
Be sure to ground this amplifier before supplying power. Grounding is necessary to use thisamplifier safely, as well as to protect the user and peripheral equipment from injury or damage. Be
sure to observe the following instructions:
1) Protective grounding
This product uses a 3-pole power cable, which is provided with grounding. Always connect to thepower outlet having grounding.
2) Caution on protective function
While the power is supplied to the amplifier, do not cut or remove the protective grounding line.
Otherwise, safety of the amplifier is not guaranteed.
3) Protective function failure
Avoid using this product when there is a failure in protective grounding or protective functions.
Confirm that there is no failure in the protective function before using.

 Use in Gaseous Atmosphere
Never use this amplifier in a flammable or explosive atmosphere, or atmosphere of steam. Use insuch atmosphere will result in danger to users and the amplifiers.

 Input Signal Connection
Connect the signal wire to the input terminal after connecting protective grounding terminal to
the ground. When connecting the signal wire, check whether the signal wire is being properly
protected from leak signals from the environment or common-mode voltage in order to avoid
electrical shock or burning. Note that the AS2503 does not have isolation between the input
block and output block.

 Cautions during Operation
Be careful of operations because large voltage might be applied between the input terminal (input
signal wire) and ground of this amplifier or input terminal and output terminal (output signal wire).

 Installation Category and Contamination Level
The AS series amplifiers are devices with Installation Category II and Contamination Level II.
Use them following the regulations defined in Installation Category II and Contamination Level II.
３

CAUTION
 Caution in Handling
When using this amplifier, always follow the precautions below.
1) Users
Users who are not familiar with the operation of this instrument should avoid using it.
2) Use and storage environment
The storage temperature and humidity of this instrument is –20 to 70C and 10 to 90%,
respectively. Avoid storing in places where the temperature could rise over the storage
temperature and where there is direct sunlight exposure such as inside an automobile.
Do not use this recorder at the following locations.
１．Locations where the temperature and humidity rise due to direct sunlight or heaters.
(The operating environment of the amplifier; temperature: -10 to 50 °C, humidity: 20 to 85%)
2. Wet locations
3. Locations where salt, oil, or corrosive gases exist
4. Damp or dusty locations
5. Locations subject to strong vibrations

3) Cautions on power supply
1. Be careful of power voltage fluctuations. Avoid using the amplifier when the voltage islikely to exceed the rated voltage.
2. If the power supply includes a lot of noise or high-voltage inductive noise, use a noise filteror other noise protection.
4) Calibration
We recommend a periodical calibration to maintain the accuracy. More reliable measurement
are possible by calibrating the amplifier once a year (extra cost option).

４CAUTION IN HANDLING
Read this manual carefully before using the amplifier.
1. Do not apply neither voltage nor current to the output terminal of this amplifier from externalsource.
2. Use this amplifier with power supply voltages from 85 VAC to 132 VAC, 180 VAC to 264 VAC, or
10 VDC to 30 VDC. The AC power supply selection switch is provided inside the chassis. To switch
the AC power supply voltage, refer to Page 7-4. If the power fuse is burnt, check the cause of fuseblow-out. To replace the fuse, always disconnect the power plug and input/output signal cable first,
and then replace the fuse in the fuse holder. For how to replace fuse, see Page 7-3. Whenreplacing, examine the ratings of fuse (e.g. for AC or DC).
3. The operating temperature and humidity of the amplifiers is –10 to 50C and 20 to 85%,
respectively. If opening the package in a warm room during the cold season, open the package

after it has reached room temperature to avoid any operational failure due to condensation on
the surface of the product.
Do not use this instrument at the following locations.
- High-humidity locations- Locations with direct sunlight exposure- In the vicinity of high-temperature heat source- Location with vibrations- Locations where salt, water, oil, or corrosive gases exist
4. When using many amplifier units, install fan units.
5. When a case is used to accommodate amplifiers, the case must be grounded.
6. This product uses a flash memory for saving setup values. Replacement of battery is not needed
accordingly.
7. This amplifier unit uses rotary encoders are used for knobs to control functions. However,indication position of the knob sometimes stays at the position between scale markings. In suchcase, the settings upon power-up may differ from those upon turning off the amplifier. To avoid
such event, it is recommended to allow knob indication to be at the correct scale marking position.

５

WARRANTY
We ship our products after conducting quality control, which covers from design to manufacturing. It is,however, possible that failures may occur in the products. If the product does not operate correctly,
please make a check of the power supply, cable connections, or other conditions before returning thisproduct to us. For repair or calibration, contact our sales agency. Before returning, be sure to inform usof the model, serial number, and problematic points. The following is our warranty.

LIMITED WARRANTY
1. Warranty period
Two years from our shipment.
2. Warranty limit
We will repair the defects of our product free of charge within the warranty period; however, thiswarranty does not apply in the following cases.
(1)Damage or faults caused by incorrect use.
(2)Damage or faults caused by fire, earthquake, traffic accident, or other natural disasters.
(3)Damage or faults caused by a repair or modification that is carried out by someone other thana service representative of us.
(4)Damage or faults caused by use or storage in environmental conditions that should be
avoided.
(5)Periodical calibration.
(6)Damage or faults caused during transportation.
3. Liability
We do not assume any liabilities for equipment other than us.

６Disposing of your used our product- Disposing of your used our product In the European Union
EU-wide legislation as implemented in each Member State requiresthat used electrical and electronic products carrying the mark(left)
must be disposed of separately from normal household waste. This
include electrical accessories, such as chargers or AC adaptors.
The mark on the electrical and electronic products only applies tothe current European Union Member States.

Outside the European Union
If you wish to dispose of used electrical and electronic products
outside the European Union, please contact your local authority andask for the correct method of disposal.

７

TABLE OF CONTENTS
Before Using················································································· 1

Examining Contents in Package ························································· 1
Cautions ······················································································· 1
PRECAUTIONSPRECAUTIONS ················································································ 2
Warning ························································································· 3 to 4
Caution ························································································· 5

Cautions In Handling
Cautions In Handling ········································································· 6
Warranty

Warranty ······················································································· 7
Limited Warranty ············································································· 7
Disposing of your used our productDisposing of your used our product ····················································· 8
Table of Contents ················································································ 9 to 11
1.Overview

1.1 Features ·················································································· 1-1
1.2 Major Features of Amplifiers ························································· 1-2
1.3 Accessories ·············································································· 1-2
1.4 Block Diagram of Measurement ····················································· 1-3
1.5 Features of Dynamic Strain Amplifiers ············································ 1-4
2. Names and Functions of Parts

2.1 Names and Functions of Parts on Front Panel ·································· 2-1 to 2-5
2.2 How to Set Calibration Value (Entering strain) ··································· 2-6
2.3 How to Set Calibration Value (Entering voltage) ································ 2-7
2.4 Indication upon Balancing ···························································· 2-8
2.5 Names and Functions of Parts on Rear Panel ·································· 2-9 to 2-10
2.6 Selecting Bridge Supply ······························································· 2-11
８

3. Before Measuring
3.1 Cable Connections ······································································· 3-1
3.1.1 Input Cable Connections ························································· 3-1
3.1.2 Power Supply Cable and Output Cable Connections ····················· 3-2
3.2 Operation before Measuring ··························································· 3-2
3.2.1 Standalone Operation ··························································· 3-2 to 3-3

3.2.2 Measuring Range ······························································ 3-4 to 3-5
3.3 Wire Disconnection Check Function ·················································· 3-6
3.3.1 Overview ··········································································· 3-6
3.3.2 Error Indication List upon Wire Disconnection and Short ················· 3-7
3.4 Wire Length Adjustment Function ····················································· 3-8 to 3-9
3.5 How to Switch Special Function Setting ············································· 3-10
3.6 Cases ······················································································ 3-11
3.6.1 Names of Case Elements ······················································ 3-11
3.6.2 How to Use Case ································································ 3-11 to 3-13
3.6.3 Heat Release for Case ·························································· 3-14 to 3-15
4. Measurement
4.1 Cautions before Measuring ····························································· 4-1 to 4-2
4.2 Input Connection ········································································· 4-3
4.2.1 Examples of Strain Gauge Bridge Configurations ·························· 4-3 to 4-5
4.2.2 Bridge Box ········································································· 4-6 to 4-8
4.2.3 Measurement with Transducer ················································ 4-8 to 4-9
4.2.4 When using AS Series amplifire as DC amplifire ··························· 4-9 to 4-11
4.3 Connection of Output to Load ·························································· 4-12
4.3.1 Connection of Output to Data Recorder ····································· 4-12 to 4-13
4.4 How to Read Measured Values ························································ 4-13 to 4-15
4.4.1 Correction of Calibration (CAL) Values ······································· 4-15 to 4-16
4.5 Special Applications ····································································· 4-17
4.5.1 Configuring two or more bridges using a single power supply ··········· 4-17
4.5.2 Special use of transducer ······················································· 4-17 to 4-18
5. Operation Theory

5.1 Flow of Measured Signal ····························································· 5-1 to 5-2

９

6. Optional Functions

6.1 Case Function and Type ······························································ 6-1
6-1-1 Accommodating amplifier units ············································· 6-1
6-1-2 How to Mount Blank Panels ················································· 6-1
6-1-3 Connecting Grounding Wire ················································· 6-1
6-1-4 Cautions on Rack-mount Case ············································· 6-1
7. Maintenance

7.1 Items to Be Checked ··································································· 7-1 to 7-2
7.2 How to Replace Fuse ·································································· 7-3

7.3 Changing AC Power Supply Voltage ··············································· 7-4
8.Specifications

8.1 AS2503 Specifications ································································· 8-1 to 8-3
8.2 AS2603 Specifications································································· 8-4 to 8-6

9. References

9.1 Frequency and Phase Characteristics ············································· 9-1 to 9-2
9.2 Cable List ················································································· 9-3 to 9-4
9.3 External Dimensions ··································································· 9-5
9.3.1 Amplifier Unit (AS2503) ························································· 9-5
9.3.2 Amplifier Unit (AS2603) ························································· 9-6
9.3.3 Panel Cut Sizes··································································· 9-7
9.3.4 Bench-top Case ································································· 9-8
9.3.5 Rack-mount Case ······························································ 9-9
9.3.6 Bridge Box (5370 and 5373) ················································· 9-10

１０

１. OVERVIEW
1.1. Features
The AS2503 and AS2603 are amplifiers that inherit the superior performance in conventional A&D’s
amplifiers. Moreover they feature new functions such as wire length adjustment and wire disconnection
checking, realizing higher-accuracy and higher-quality measurement and a reduction in measurement
preparation time. The AS2503 and AS2603 include an LED monitor and the auto-balancing function,
thereby improving their operability. The connection status between input/output block and power supply
block in AS2503 is direct connection and the structural status of those in AS2603 is isolation. Since
constant voltage ranging from 2VDC to 10VDC for bridge power supply is used and high frequency
responses (DC to 500 kHz in AS2503 and DC to 100 kHz in AS2603) are realized, measurement ofhigh-speed strain like shocks is possible. Also these amplifiers can be used as a DC amplifier, featuring10,000X in AS2503 and 5,000X in AS2603 of the maximum gain.
Another feature of the AS2503 and AS2603 amplifiers are their lead-free and battery-less product design.
When several amplifier units are installed in a case, power supply, auto-balancing, calibration value
input, and key-locking for all amplifier units can be made by one operation. If you encounter any problem,
read the section for maintenance, and contact with A&D’s sales agency if the problem is not solved.

Wide Bandwidth

Wide Bandwidth

DC Strain Amplifier

DC Strain Amplifier

AS2503

AS2603
DC Strain Amplifier

１－１

1.2 Major Features of Amplifiers
The following table lists the overview of dynamic strain amplifiers AS2503 and AS2603.
Model

BV

Configuration Balance

Frequency

Sensitivity

response(at BV = 2V)

Major application-6

AS2503 DCV

Unit

Auto

DC～500kHz

10V/1,000×10
strain- Measurement of high-speed
strain like a shock- Can be used for a DC amplifier.
- Measurement of high-speed-6AS2603 DCV

Unit

Auto

DC～100kHz

10V/2,000×10
strainstrain like a shock.
Can be used for a DC amplifier.
Isolation between input and output
and power-supply block.

Table 1-1 Specifications of DC Strain Amplifiers
The following cases for units are provided.
Product Name

Bench-top caseRack-mount case

Model

Description

Remark

AS16-104

4CH Bench-top case

Functions of +/-CAL, BAL, KEY-LOCK and

AS16-105

6CH Bench-top casebatch power-on/off is available for all units.

AS16-106

8CH Bench-top case

Linked or synchronized operation with otherAS16-107

8CH Rack-mount caseunits is available.

Table 1-2 Description of Case

1.3 Accessories
・Output cord (0311-2057) x 1
・Time-lag fuse
(Fuse for AC power supply: 85 to 132VAC/180 to 264VAC, 125mA: 0334-4307 x 1)
(Fuse for DC power supply: 10V to 30VDC, 800mＡ: 0334-4315 x 1)
・Screw driver x 1
・AC power cord (0311-5044)
・Instruction Manual x 1

１－２

1.4 Block Diagram of Measurement
The following diagram illustrates a typical measurement system that broadly covers a variety of factors
including signal amplitude, frequencies, and measuring time.

Phenomena

Sensor

Instrument

Recorder & Analyzer

Oscilloscope

Waveform

Data Recorder

Data Recording

Digital Voltage
Meter

Digital Recording

Pen
Oscillograph

Waveform Rec. in Low Freq.
Range DC 120Hz

Thermal Dot
RecorderWaveform Rec. in High Freq.
Range DC 20kHz

DAQ

Waveform Rec. in High Freq.
Range DC 100kHz

Data Processor Data Analysis & Processing

Figure 1-1 Block Diagram of Measurement

１－３

1.5 Features of Dynamic Strain Amplifiers
Bridge power

DC bridge

voltage supply(DC strain amplifier）
1. Strain gauges

Recommended sensors

2. Sensors for load, displacement, acceleration, and torque(Strain gauge-type transducers)
DC strain amplifiers have higher non-linearity and sensitivity than those of

FeaturesAC strain amplifiers. Generally, the DC strain amplifiers are used withstrain gauge transducers, but they can also be used as DC amplifiers.

Table 1-3 Recommended Sensors and Features

Amplifier Type

ＤＣ Strain Amplifier

ＤＣ Strain Amplifier

Model

AS2503 (Wide-range type)

AS2603 (Wide-range type)+/- 10 V output in ±1,000×10－

Voltage sensitivity

6

6+/- 10 V output in ±2,000×10－

Non-linearity± 0.01% /FS± 0.05% /FS

Frequency response

DC to 500kHz

DC to 100kHz

6

6

80×10－ strain p-p

50×10－ strain p-p

Maximum gain

10,000X

5,000X

Bridge voltage

2, 3, 5, 9, and 10 VDC

2, 3, 5, 9, and 10 VDC

NA

+++

+++

+++

+++

++

Measurement with strain gauge++

If the distance between

+++

+++

Wire-length adjustment: patent protected

Wire-length adjustment: patent protected

Possible

Possible

Noise

Isolation between input block
and power supply
Measurement with strain
gauge transducers
Measurement of strain
such as shockmeasuring point and instrument
Using as DC amplifier+++: Best suited++: Suited+: Usable but not suited

NA: Not suited or cannot be used

Table 1-4 Functional Difference between AS2503 and AS2603

１－４

２. NAMES and FUNCTIONS OF PARTS
①
②
③
⑥
⑤
⑦

－ｆ
④

⑩

⑧

⑨

⑪

1

2

4

3

⑫

⑬

⑭
⑮
⑯
⑰

⑱
⑲

5
6
7

Figure 2-2

Figure 2-1
AS Amplifier Front View (AS2503)

AS Amplifier Back View

2.1 Names and Functions of Parts on Front Panel (See 2-1.)
NumberName

Function①

Model

Model indication②

Level meter (17-dot LED)

This level meter monitors the output voltage of
OUTPUT1

3 . The green LED at the middle comes onwhen the output voltage is within 100 mV. When the
output voltage exceeds 10.05 V, the LED at theover-voltage side blinks.

Table 2-1 Front Panel: Names and Functions (1)２－１Number③

Name
Digital monitor (Four digits 1/2)

Function
This monitor digitally displays the output voltage of
OUTPUT2

4 . When OUTPUT2 level adjustment

volume ⑱ is turned clockwise, [10.000] is indicated in
response to an output of 10 V. In combination with ⑱, 2
kN can be displayed as [2.000] when the transducer
converting 2 kN to 10 V is used. For decimal point shift,refer to page 3-10.
④

Wire disconnection check/Pressing the knob performs wire disconnection check

Wire length adjustment/

andAuto-balance knob (BAL)

balancing of resistors and capacitance. For details, see

wirelengthadjustment,

enabling

automatic* See pages 3-4 to 3-6 for wire page 2-6 Indication upon Balancing.
disconnection check and wire
length adjustment

The result of wire disconnection check is indicated on
digital monitor ③. If there is neither disconnection nor
short, the indication of Good is made, thereby making
wire length adjustment (dropout rate indication) andauto-balancing. If there is a disconnection or short, theproblematic location is repeatedly indicated. Afterconfirming

thelocation,makerepair.

For

more

information on wire disconnection function, see pages
3-4 and 3-5.
Whenever this button is pressed, the resistancebalance is automatically kept accordingly.
Note

When the high-pass filter is used (High-passfilter LED ⑮

illuminating), even balancing is not

performed, indication of good balance (0 V) is made.
Therefore, do not forget to perform balancing. When thehigh-pass filter is turned on, a frequency element of 0.5
Hz or lower including DC is deleted, which is the state of
the offset voltage cancellation.
Resistance balance fine tuning

Turning this knob clockwise moves the output to the(R-FINE)positive side, while turning it counter-clockwise moves
the output to the negative side.

Table 2-1 Front Panel: Names and Functions (2)２－２Number⑤

Name

Function

KeyLock switch

On/Off switching for keyLock can be made by pressing(KEY LOCK）

this knob for one second or longer. While in the lockstate, keyLock LED ⑥ illuminates. In this state, BAL④, measuring range selection ⑧, measuring range finetuning ⑨, calibration value setting ⑫ and filter setting⑯ cannot be used. Pressing this knob for one second or
longer cancels the lock; keyLock LED ⑥ also comes
off.

⑥

KeyLock LED

This LED indicates whether keyLock is effective or not,in that light-up for lock and light-out for unlock..

⑦

Bridge power voltage LED

This LED indicates the bridge power voltage (2 V, 3 V, 5

(BV (V))V, 9V or 10 V). To select, use bridge power voltage
selection switch2

on the rear panel. For moredetails, see 2-11 Bridge Power Selection.
⑧

Measuring range selection knob

This knob is used to select the measuring range. Turing(RANGE)

this knob clockwise narrows the measuring range (i.e.
increasing the sensitivity). See page 3-4 for measuring
range. In this case, fine tuning is not made. [Fine tuning
LED ⑩ comes off.]⑨

Measuring range fine tuning knob Fine tuning is made with the knob. Turning the knob
(FINE)

clockwise narrows measuring range (i.e. increasing
sensitivity) and wides the range (i.e. decreasing
sensitivity). As measuring range fine tuning knob ⑨
and measuring range selection functions together in
AS2503, the range automatically shifts when signals
exceed the measuring range. See measuring range LED⑪. Fine tuning LED ⑩ comes off upon range shift. On
the other hand in AS2603, as measuring range finetuning knob ⑨ and measuring range selection does not
function together. After fine tuning is made withmeasuring range fine turning knob and measuring range
selection knob ⑧ is used to switch the range, the finetuning of measuring range is maintained.

Speed selection

Pressing this knob allows the fine tuning speed for(SLOW/FAST)

measurement range to switch between high speed andlow speed. Also, resistance balance fine tuning ④ isswitched between high speed and low speed.

Table 2-1 Front Panel: Names and Functions (3)２－３Number

Name

Function⑩

Fine tuning LED

This LED comes on while fine tuning is made.

⑪

Measuring range LED

This LED indicates measuring range. The measuring
ranges of AS2503 and AS2603 are explained in 3-4
Measuring Range and 3-5 Measuring Range.

⑫

Calibration value setup knob
(CAL(με)) με=10-6Indicated value is calculated value based on input. The
value can be set from 1με to 9999με by a step of 1με.
Pressing the knob changes the digit for calibration value
LED ⑬ and turning the knob changes values.
For further information, see page 2-6 How to Set

First digit
Second digit
Third digit
Fourth digit⑬

Calibration value LED

Calibration Value. The value the equivalent voltage value
based on a gauge factor of 2.0 and the one gauge
configuration (1mV/V=2000με).
The LED displays calibration value and setting status(digit blinking).

⑭

Calibration

value

application This switch is used to input the value that is set bycalibration value setting knob ⑫. Pushing toward rightswitchinputs a plus value (tension) and pushing toward left
inputs a minus value (compression). As a calibration
value is superimposed with the input signal to generate
the output voltage, return the position to OFF (middle)
after inputting the calibration value.
⑮

High-pass filter LED

This LED comes on when the high-pass filter is used.

⑯

ON./OFF for high-pass filter

Pressing the knob allows the high-pass filter to switch(FILTER)between ON and OFF. High-pass filter LED ⑮ comeson for ON and it comes off for OFF.
Filter type: 2-pole Bessel filter
Cut-off frequency: 0.5 Hz

Low pass filter setting knob

This knob is used to set the low-pass filter. Turning the(FILTER)knob allows the filter to be set to OFF (= W/B) or cut-off
frequency. The setting information is displayed on
low-pass filter LED ⑰.
Filter type: 4-pole Bessel filter
Cut-off frequencies: 10, 30, 100, 1k, 30kHz, W/B

Table 2-1 Front Panel: Names and Functions (4)２－４Number⑰

Name
Low-pass filter LED

Function
This LED indicates the cut-off frequency for the low-passfilter. W/B (wideband) signifies OFF for the low-passfilter.

⑱

OUTPUT2 level control volume

The output voltage for

OUTPUT2

4

can becontrolled from the rating 10 V to 1 V. Control the voltage
with the attached screw driver. The output value isindicated on the digital monitor ③. As decimal point
shifting is possible through the dip switch on the bottom
face of the amplifier unit, digital monitor ③ can be used
for an indicator. For how to shift the decimal point, referto page 3-10.
⑲

Power switch

Pressing this switch supply the power to the amplifier(POWER)

unit. The power is turned off by pressing this button
again.

Table 2-1 Front Panel: Names and Functions (5)２－５

2.2 How to Set Calibration Value (CAL) (Entering strain)
The indicated value is calculated value based on input. The value can be set from 1με to 9999μεby a step of 1με (=10-6). Values should be set for each digit (Figure 2-3). Pressing calibration value
setting knob ⑫ (Figure 2-3) illuminates the fourth digit of calibration value LED ⑬. Turning theswitch changes the value on ⑬. Even the indication is blinking, the setting is being made.
Press the knob when your target value is indicated. In this case, blinking of ⑬ turns toilluminating (value fixed), and then the third digit starts blinking. Repeat this step up to the first digit.
After the first digit comes on and then all digits illuminates, calibration value setting completes. Tochange the calibration value, repeat the steps above. The value is based on the equivalent value forgauge factor 2.00 and one gauge configuration. For strain gauge-type transducer, set and calculate
the value based on 1mV/V=2000με.
■Calibration value setting
For strain input (μ ε )Calibration value(CAL) setting range

Forth Digit

Third Digit

Second DigitFirst Digit

1 to 9999

0 1 2 3 4 5 6 7 8 9

0 1 2 3 4 5 6 7 8 9

0 1 2 3 4 5 6 7 8 9

0 1 2 3 4 5 6 7 8 9Figure 2-3
First digit
Second digit
Third digit
Fourth digit

Press calibration setting knob ⑫

Four dsetting
completes

The fourth digit blinks.

Indication 0 at the first digit
blinks. Press ⑫ once as avalue change for the first
digit is not necessary.

Figure 2-4
２－６

Calibration value (CAL)

Turn calibration setting knob ⑫
to set the value to 5. Press ⑫.

Indication 5 at the fourth digit
comes on and 0 at the third digit
blinks. Press ⑫ twice as valuechanges for the third andsecond digits are not necessary.

2.3 How to Set Calibration Value (CAL) (Entering voltage)
To change the unit from mV to µ and µ to mV, depress calibration value setting knob ⑫ (SeeFigure 2-5) for one second or longer. Then, the indication of LED changes (e.g., fromµ to mV). You
can change the unit by depressing the calibration value setting knob ⑫ for one second or longer
when setting the value of each digit. The settable values are as follows.
■Calibration value setting
For voltage input (mV)CAL
0.01～9.99
10.00～99.99

Forth Digit
0123456789

Third Digit
0.1.2.3.4.5.6.7.8.9.
0.1.2.3.4.5.6.7.8.9.

Second Digit
0123456789
0123456789

First Digit
0123456789
0123456789

Figure 2-5

E.g. When changing the CAL value from 2000µ to 80.25 mV (See Figure 2-6)

Press calibration value setting
knob ⑫ for one second or
longer.

As soon as the fourth digit blinks,

A value of 8 is illuminated on

decimal number digit starts blinking.

the forth digit and also the

The unit of LED ⑬ changes fromthird digit blinks. As the thirdµ to mV. Turn ⑫ and set the value

digit value cannot changed

to 8, and then press ⑫.

(staying to be 0), press ⑫.

All digits illuminates,

A value of 2 is illuminated on the

A value of 0 is illuminated on theand the setting is completed

second digit, and then the first digit

third digit, and then the second

after 80.05 is indicated.

blinks. Turn ⑫ to set to 5, anddigit blinks. Turn ⑫ to set 2,

after that Press ⑫.

and after that press ⑫.

Figure 2-6

２－７

2.4 Indication upon Balancing
Pressing BAL knob ④ executes wire disconnection check and wire length adjustment, thus
automatically realizing both resistance balancing and capacitance balancing. While the wire
disconnection check and wire length adjustment functions are effective (ON), the following
indications appear. If there is wire disconnection or short, the problematic location is indicatedrepeatedly on digital monitor ③. The indication continues until the BAL knob is pressed for fiveseconds or longer or the power of amplifier is turned off. Make repair following the indication. Whenwire disconnection check is not effective (OFF), the portions enclosed by broken line are omitted,
executing auto-balancing. For how to set these functions to ON or OFF, refer to page 3-10 How to
Switch Special Function Setting.

Display bridge check

Push BAL. knob.

Checking AB line

Checking BC line

No disconnection or short
Repeatedly showing
until BAL knob beingpressedChecking DA line

Checking CD line
Disconnection or short

Example of Indication: When there are
disconnections at AB and DA on the bridge

Disconnection in

Disconnection in DA on bridge

AB on bridge

No disconnection or short : Good

Disconnection on wire A

Cable length
Compensation checkorIndicating dropout rate

Figure.2-5 Block
Bridge check : ON

Cable Length Compensation Check :ON

diagram for balance
operation
Auto Balance

２－８

①
②
③
⑥
⑤
⑦

－ｆ
④

⑩

⑧

⑨

⑪

1

2

3

4

6

5

⑫

⑬

⑭
⑮
⑯
⑰

⑱
⑲

7

Figure 2-2 Rear view of

Figure 2-1 Front view ofAS amplifier unit (AS2603)

AS amplifier unit

2.5 Rear Panel: Names and Functions (See Table 2-2)
NumberName
1
Input connector (INPUT)

Function
The bridge box or connector or a transducer isconnected. The connector should be an input connector
for strain measurement confirming the standards of The
Japanese Society for Non-Destructive

Inspection(NDIS4102).
2
3Bridge power voltage selection Selection of power voltage applied to the bridge can beswitch (BV)

switched (0.5 V or 20 V).

Output connector 1

The output voltage and current are 10 V and 5 mA,(OUTPUT1)

respectively. This connector can be connected to arecorder (e.g. thermal-dot recorder or data acquisition
devices) or A/D converter, which accept voltage signals

Table 2-2 Rear Panel: Names and Functions (1)
表２－１ 前面パネル（名称と機能）

２－９Number4

Name

Function

Output connector 2

The output voltage and current are 10 V and 10 mA,(OUTPUT2)

respectively. The output level can be controlled from 10
V to 1 V with OUTPUT2 level adjustment volume ⑱ on
the front panel.
Note
If output of current from 4 to 20 mA is required,modification from the voltage output to the current
output is available with extra costs. For details, contact
with NIPPON AVIONICS’s sales agency.

5Interface connector

This connector is used to connect an amplifier unit and(I/F)

case electrically. The pin layout is shown as follows.
Other than DC power voltage supply, it is possible toperform keylock, auto-balancing, calibration value
application,

andsynchronous

signaloutput.

A

connection cable is available separately.

Amplifier, Interface connector (from rear side)

6

Protective grounding terminal(1) +CAL(2) -CAL(3) BAL(4) OSC(5) GND(6) KEYLOCK(7) GND(8) DC+(9) DC-If 3-pin power cord cannot be used for grounding, use
this terminal for grounding.

7Power supply connector

This is the connector to be connected to the AC power
cable. The AC power supply block of the amplifier unit
have a withstand voltage of 1.5 kVAC/minute against
input, output, and case.
Note
When using a power supply of 100VAC, use AC power
supply cord 47326. When using 110VAC or higher, use
optional AC power supply cord 200V (0311-5112).
When using 180 to 264 VAC, also use optional AC
power cord 200V (0311-5112).

Table 2-2 Rear Panel: Names and Functions (2)２－１０2.6 Selecting Bridge Supply
Users can change bridge voltage by the voltage pinch on the back panel.
Bridge supply: 2V, 3V, 5V, 9V and 10V
Set the slit of the pinch at the number of selected voltage.

Select Pinch:Set the slit of the pinch
to select bridge voltage.

２－１１

３. BEFORE MEASURING
3.1 Cable Connections
3.1.1 Input Cable Connections (See Figure 3-1.)(1) Paste a strain gauge to the location where measurement is made.
(2) Connect the strain gauge to the bridge box.
(3) Adjust the power supply for strain gauge with bridge power voltage selection switch

2 . Set the

supply voltage to 2 V for general 120-ohm strain gauge. When using a transducer, set to 3 V, 5 V,
9 V, or 10 V according to the input voltage. For details see page 4-7, Measurement Using
Transducer.
(4) Connect the bridge box or a transducer to the input connector2

on the rear panel. For

connection information, see Cautions before Measuring on page 4-1. Since the AS2503 andAS2603 automatically adjust the voltage drop generated between the bridge and the amplifier
through the wire length adjustment function, high-accuracy measurement is possible. For more
information on this adjustment function, see page 3-6.

Mark

Input Connector

When you yank this plug out of
the connector, you must holdthis part without rotating it.

Rear Panel

Bridge Box
Use a strain gauge with short wires between
the measuring point and the bridge box inorder to reduce noise as much as possible.
Do not cut or add wire as the strain gauge
performs gauge factor calibration with thewires connected.

Figure 3-1 Connection with bridge box and so on

３－１

3.1.2 Power Supply Cable and Output Cable Connections (See Figure 3-2)
(1) Use the power supply cable for 100 VAC (Model 0311-5112 for 110 VAC or higher), 200 VAC, or
12 VDC depending on the voltage.
(2) Connect the output cable appropriate to the recorder to be used.
(3) For more information, refer to Connection between Output and Load on page 4-12.
(4) The chassis of this amplifier is connected to the output common lead.

You can lock the cableby turning for 45 clockwise.

Cable for OUTPUT1.2（0311-2057）

DC supply cable or
SYNC cable
AC power supply cable
100 VAC power supply: 47326,
200 VAC power supply: 0311-5112)

Figure 3-2 Connection of power supply code and output cable
3.2 Operation before Measuring
3.2.1 Standalone Operation(1) Set the calibration value application switch ⑭ (+  -) to the  (OFF) position.
(2) Pressing power switch ⑲ (POWER) supplies power to the amplifier.
(3) Set the measuring range to OFF (Measuring Range LED ⑪) using measuring range selection
knob ⑧ (RANGE).
(4) Setting the measuring range to OFF using measuring range selection knob ⑧ illuminates thegreen LED in the middle of level meter ②. Activate for about 10 minutes.
(5) For correct strain measurement, you must conduct initial balancing for the bridge circuit. Tuneto your target measuring range using measuring range selection knob ⑧ and adjust theoutput to zero while no load is being applied.
(6) Wire disconnection check, wire length adjustment, and automatic balancing.
Turn measuring range selection knob ⑧ clockwise up to your target measuring range,
and then narrow the measuring range (i.e. increasing sensitivity). In this case, the indication of
measuring range LED ⑪ changes from OFF to other values, in that the value changes toward200. Pressing the BAL knob ④ performs the wire disconnection check, wire length
adjustment (indication of the rate of damping), and auto-balancing in this order. For more
information, see Indication upon Execution of BAL on page 2-7.
３－２

(These functions are available when the dip switches for the wire disconnection check
and wire length adjustment are set to ON.)
When there is neither wire disconnection nor a short, and indication of Good is indicatedon the digital monitor ③, and then the wire length adjustment (indication of the rate ofdamping) and auto-balancing are performed. If there is a wire disconnection or short, theexamination results are indicated on the digital monitor ③ repeatedly. The contents to be
indicated are listed on the pages from 3-6 to 3-7. Following the indicated results (page 3-7),
repair the cable or bridge. After the repair, press BAL again for at least five seconds to checkfor failures.
The wire length adjustment automatically calculates the voltage drop occurring in thecable connecting between the AS amplifier and measurement point (bridge), saving thiscalculation data into the internal memory. The power supply to the bridge is provided after thisadjustment. As a result, high-accuracy strain measurement is available without considering the
conductor resistance generated by the cable.
After the wire length adjustment is made, the initial balance is made, and then the green
LED in the middle comes on. For further fine-tuning, turn the BAL knob ④ clockwise oranti-clockwise. The adjustment range is an output of 1 V.
* The wire length adjustment data is stored in the internal memory until the BAL switch ispressed, even if the power switch ⑲ is turned on or off. The wire length function is set
to off or non-adjustment by the dip switch on the bottom face of the AS amplifier.
* For more information on wire disconnection function and wire length adjustment, see
the pages 3-6 to 3-8.
(7) In response to the magnitude of the strains anticipated, apply a calibration value using thecalibration setting knob ⑫ first, and then start measuring.
The measuring range can be checked after applying a calibration value using thecalibration value application switch ⑭. The measuring ranges for AS amplifiers are describedon page 3-4 for AS2503 and page 3-5 for AS2603.

３－３

3-2-2 Measuring Range
AS2503-6

Measuring Range

Measuring Range(Measuring Range

Fine Tuning Knob ⑨

LED ⑪)

Measurable Strain (×10 strain)
BV=2V

BV=3V

1k

1X to 2X continuous tuning±1,000 to ±2,000±666 to ±1,333

2k

1X to 2.5X continuous tuning±2,000 to ±5,000±1,333 to ±3,333

5k

1X to 2X continuous tuning±5,000 to ±10,000±3,333 to ±6,666

10k

1X to 2X continuous tuning±10,000 to ±20,000±6,666 to ±13,333

20k

1X to 2.5X continuous tuning±20,000 to ±50,000±13,333 to ±33,333

50k

1X to 2.5X continuous tuning±50,000 to ±125,000±33,333 to ±83,333-6

Measuring Range

Measuring Range(Measuring Range

Fine Tuning Knob ⑨

LED ⑪)
1k

1X to 2X continuous tuning

2k

1X to 2.5X continuous tuning

5k

Measurable Strain (×10 strain)
BV=5V

BV=9V

±400 to ±800

±222 to ±444±800 to±2,000±444 to ±1,111

1X to 2X continuous tuning±2,000 to ±4,000±1,111 to ±2,222

10k

1X to 2X continuous tuning±4,000 to ±8,000±2,222 to ±4,444

20k

1X to 2.5X continuous tuning±8,000 to ±20,000±4,444 to ±11,111

50k

1X to 2.5X continuous tuning±20,000 to ±50,000±11,111 to ±27,777

Measurable Strain

Measuring Range

Measuring Range(Measuring Range

Fine Tuning Knob ⑨

LED ⑪)-6(×10 strain)
BV=10V

1k

1X to 2X continuous tuning±200 to±400

2k

1X to 2.5X continuous tuning±400 to±1,0005k

1X to 2X continuous tuning±1,000 to±2,00010k

1X to 2X continuous tuning±2,000 to±4,00020k

1X to 2.5X continuous tuning±4,000 to ±10,000

50k

1X to 2.5X continuous tuning±10,000 to ±25,000

Table 3-1 Measuring Range of AS2503
As measuring range fine tuning knob ⑨ of AS2503 functions in tandem to measuring range
selection. Accordingly, if the signal exceeds the measuring range, the range automatically changes(See measuring range LED ⑪). Fine tuning LED ⑩ comes off upon switching.

CAUTION
After taking the balance, if you change the fine adjustment or measurement range,
please rebalances.
３－４

AS2603-6

Measuring Range

Measuring Range(Measuring Range

Fine Tuning Knob ⑨

LED ⑪)

Measurable Strain (×10 strain)
BV=2V

BV=3V

2k

1X to 2.5X continuous tuning±2,000 to ±5,000±1,333 to ±3,333

5k

1X to 2X continuous tuning±5,000 to ±10,000±3,333 to ±6,666

10k

1X to 2X continuous tuning±10,000 to ±20,000±6,666 to ±13,333

20k

1X to 2.5X continuous tuning±20,000 to±50,000±13,333 to ±33,333

50k

1X to 2X continuous tuning±50,000 to ±100,000±33,333 to ±66,666

100k

1X to 2.5X continuous tuning±100,000 to ±250,000±66,666 to ±166,666-6Measuring Range

Measuring Range(Measuring Range

Fine Tuning Knob ⑨

LED ⑪)

Measurable Strain (×10 strain)
BV=5V

BV=9V

2k

1X to 2.5X continuous tuning±800 to±2,000±444 to±1,1115k

1X to 2X continuous tuning±2,000 to±4,000±1,111 to±2,22210k

1X to 2X continuous tuning±4,000 to±8,000±2,222 to±4,44420k

1X to 2.5X continuous tuning±8,000 to ±20,000±4,444 to ±11,111

50k

1X to 2X continuous tuning±20,000 to ±40,000±11,111 to ±22,222

100k

1X to 2.5X continuous tuning±40,000 to ±100,000±22,222 to ±55,555

Measuring Range(Measuring Range

Measurable Strain
Measuring Range Fine Tuning

LED ⑪)

Knob ⑨-6(×10 strain)
BV=10V

2k

1X to 2.5X continuous tuning±400 to±1,0005k

1X to 2X continuous tuning±1,000 to±2,00010k

1X to 2X continuous tuning±2,000 to±4,00020k

1X to 2.5X continuous tuning±4,000 to ±10,000

50k

1X to 2X continuous tuning±10,000 to ±20,000

100k

1X to 2.5X continuous tuning±20,000 to ±50,000

Table 3-2 Measuring Range of AS2603
As measuring range fine tuning knob ⑨ of AS2603 is not coupled with measuring range selection.
Even the range is switched with measuring range selection knob ⑧ after fine tuning is made withmeasuring range fine tuning knob, the fine tuning for the measuring range is maintained.

CAUTION
After taking the balance, if you change the fine adjustment or measurement range,
please rebalances.
３－５

3.3 Wire Disconnection Check Function
3.3.1 Overview
The wire disconnection check function of the AS amplifiers can detect a bridge wire
disconnection, short, or cable disconnection. Since disconnected portions can easily be found,
testing personnel can reduce the measurement preparation time or prepare countermeasuresagainst wire disconnections. The wire disconnection check function can be set to on or off using thedip switch on the bottom face of the AS amplifier.
(The bridge resistance should be 120  or higher.)
Bridge circuit block
Cable

A
D Ｄ

Ａ

B
Ｂ

Cable A
Cable B
Cable C
Cable DAS

ＣC
Cable disconnection occurs
at cable D

Cable disconnection occurs between
A and B in the bridge circuit.

Figure 3-3 Overview of Disconnection Check
When no failure is found after the wire disconnection check, the indication Good is displayedon the digital monitor. If a failure is found, the failure information is repeatedly displayed on thedigital monitor ③. The indication does not disappear until the BAL knob is pressed or the amplifier
unit power supply is turned off. For error contents, refer to page 3-5. After confirming the cause of
failure, take measures to repair the failure. Following repairs, press the BAL knob for longer than
five seconds for disconnection checking. If there is no problem, Good is indicated.
If disconnection or a short is detected, there is always an error indication. However, the failure
location may not be found depending on the number of disconnections or the disconnection
conditions on the cable or at the bridge, or both.
When the wire disconnection function is turned off, switch the dip switches on the bottom faceof the amplifier according to How to Switch Special Function Setting on page 3-9.

Cable disconnection occurs
between A and B in thebridge circuit.

Cable disconnection occurs
at cable C

Short disconnection
occurs between A and D in
the bridge circuit.

Figure 3-4 Example of error indication

３－６

3.3.2 Error Indication List upon Wire Disconnection and Short

Error indication in the case of disconnection
Disconnection on bridge circuit
A-B
B-C
C-D
D-A
○
○
○
○
×
○
○
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×
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×
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×
×
×
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×
×
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×
×
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×
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×
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×
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×
×
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×
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×
×
×
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×
×
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×
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×
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×
×
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×
×
×
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×
×
×
×
Ｘ： Disc on n e c tion

A
○
○
○
○
○
○
○
○
○
○
○
○
×
○
○
○
○
○
×
○
×
○
○
×
○
×
×
×
○
×
○

Disconnection on cable
B
C
D
○
○
○
○
○
○
○
○
○
○
○
○
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×
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×
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×
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×
×
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×
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×
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×
×
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×
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×
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×
×
×
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×
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×
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×
×
×
×
×
×
×
×
○
○
○

INDICATION （Digital Monitor③）
Good
E-ab
E-bc
E-cd
E-da
E-ab

E-bc

or

E-Lb

E-bc

E-cd

or

E-Lc

E-cd

E-da

or

E-Ld

E-ab

E-da

or

E-La

E-bc
E-ab

E-da
E-cd

E-ab

E-bc

E-cd

or

E-Lb

E-Lc

E-ab

E-bc

E-da

or

E-La

E-Lb

E-ab

E-cd

E-da

or

E-La

E-Ld

E-bc

E-cd

E-da

or

E-Lc

E-Ld

OPEn

Error Indication in the case of short
Disconnection on bridge circuit
A-B
B-C
C-D
D-A
○
○
○
○
×
○
○
○
○
×
○
○
○
○
×
○
○
○
○
×
×
×
○
○
○
×
×
○
○
○
×
×
×
○
○
×
×
○
×
○
○
×
○
×
×
×
×
○
×
×
○
×
×
○
×
×
○
×
×
×
×
×
×
×

A
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○

Disconnection on cable
B
C
D
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○

INDICATION （Digital Monitor③）
Good
S-ab
S-bc
S-cd
S-da

S-ab

S-ab
S-bc
S-cd
S-ab
S-ab
S-bc

S-bc
S-cd
S-da
S-da
S-cd
S-da

S-bc

S-cd

Table 3-3 Error indication upon wire disconnection and short
３－７

S-da

3.4 Wire Length Adjustment Function
If the length of the cable connecting between the bridge and amplifier is long, the bridge resistanceis lower due to the conductor resistance of the cable. For the rate of the bridge voltage drop, refer totable 3-3 below. Before this function is employed, testing personnel made remote sensing through a
6-core cable or adjustment through values for the cable length or wire diameter.
The AS series employs a unique automatic adjustment circuit in lieu of the conventional techniquesabove, thereby enabling supplying the bridge power that reflects conductor resistance. Since
high-accuracy strain measurement is possible, testing personnel can reduce measurement time andmeasurement steps.
On/off for wire length adjustment can be switched using the dip switch on the bottom face of theamplifier. See page 3-10 for more details.

Distance between amplifier and bridge box (m)Bridge Resistance

２０ｍ

５０ｍ

１００ｍ

２００ｍ

１２０Ω

－１．２

－３．０

－５．８

－１１．０

３５０Ω

－０．４

－１．１

－２．１

－４．１

５００Ω

－０．３

－０．７

－１．５

－２．９

１０００Ω

－０．１

－０．４

－０．７

－１．５

Table 3-4 Rate of Voltage Drop (%) (0.5 mm2 wire at 20C)

BridgeAmplifierBridge voltage - 
is applied.

－α

Bridge voltage
is applied.

Conventional
Amplifier－α1) Automatically calculating voltage drop of the bridge voltage due to cable conductor resistance.
2) Applying the bridge voltage reflecting the voltage drop
Real bridge voltage

Bridge voltage + 

is applied.
is applied.
ケーブルの導体抵抗によるブリッジ電圧の電圧降下を自動算出。

－α

AS Amplifier

Length: 300m, Core wire: 0.5 mm2, using our optional extension cable

Figure 3-5 Explanatory Diagram of Wire Length Adjustment Function
３－８

CAUTION
The AS Series amplifiers are provided with the wire length adjustment function that corrects thevoltage drop of excitation voltage supplied from the amplifier if the wire length between the amplifierand bridge circuit for strain measurement.
This functionality is based on the assumption that the transducer or bridge box is configured by
the Wheatstone bridge circuit. Therefore, the wire length adjustment function does not function if acalibration value generator that does not include the Wheatstone bridge circuit.
Moreover, the wire length adjustment function may not correctly function for transducers that
include a resistor for output adjustment. The reason is the amplifier regards the resistance of theresistor for output adjustment as the resistance of wire, thereby correcting the voltage drop. As aresult, the voltage applied to the transducer may increase by a maximum of 130% compared to thenormal voltage, which causes the transducer to output larger values. Be careful when usingtransducers.

Resistor for output adjustment in NIPPON AVIONICS’s 9E Series transducers
Model

Resistor

Model

Resistor

Model

Resistor

Model

Resistor

9E01-L1

Provided

9E01-L21

Provided

9E02-P2

Provided

9E08-D1A

Provided

9E01-L2

Not provided

9E01-L22

Provided

9E02-P3

Not provided

9E08-D2

Provided

9E01-L3

Provided

9E01-L23

Provided

9E02-P4

Provided

9E08-D3

Provided

9E01-L4

Provided

9E01-L23W

Provided

9E02-P5

Not provided

9E08-D4

Provided

9E01-L5

Provided

9E01-L23H

Not provided

9E02-P6

Not provided

9E08-D5

Provided

9E01-L8

Provided

9E01-L31

Provided

9E02-P6G

Not provided

9E08-D6

Not provided

9E01-L9

Provided

9E01-L33

Provided

9E02-P7

Not provided

9E08-D7

Not provided

9E01-L11

Provided

9E01-L35

Provided

9E02-P11

Provided

9E05-B1

Provided

9E01-L14

Provided

9E01-L36

Provided

9E02-P13

Provided

9E05-T1

Provided

9E01-L15

Provided

9E01-L41

Not provided

9E02-P14

Not provided

9E06-S1

Not provided

9E01-L18

Provided

9E01-L42

Not provided

9E02-P15

Not provided

9E06-S2

Not provided

9E01-L18W

Provided

9E01-L43

Not provided

9E02-P16

Not provided

9E07-A1

Not provided

9E01-L19

Provided

9E01-L44

Not provided

9E02-P17

Not provided

9E07-A3

Not provided

9E01-L19W

Provided

9E01-L45

Not provided

３－９

3.5 How to Switch Special Function Setting
By switching dip switches on the bottom face of the AS amplifier, settings for special functions canbe made.
- ON/OFF for wire length adjustment- ON/OFF for wire disconnection check function- Decimal point shift for digital monitor ③

Front panel
Rear panel

dip switches

Figure 3-6 Position of dip switch

Dip switch

Function

Description
Wire length adjustment function: (Switch 1
is Off.)Wire disconnection check function: ON

Factory-set

1 2 3 4

ON↓

(Switch 2 is On.)

(Factory-set settings)

Decimal point of digital monitor ③ ,displaying decimal point at the fourth place:
10.000 (Switches 3 and 4 are On.)
Wire length adjustment function: OFF

1 2 3 4

ON↓

Wire length adjustment function(Switch 1 up: Off)

(Switch 1 changeover)

Wire length adjustment function: ON(Switch 1 down: On)Wire

1 2 3 4ON↓

disconnection

check

functionON↓(Switch 1 down: On)
Displaying the decimal point of digital(Setup through the combinations monitor ③ at the third place: 100.00
of switches 3 and 4)
Decimal point indication

1 2 3 4ON↓

Displaying the decimal point of digital(Setup through the combinations monitor ③ at the second place: 100.00
of switches 3 and 4)
Multipoint indication

1 2 3 4

ON↓

(Switch 2 up: Off)
Wire disconnection check function: ON(Switch 2 changeover)Decimal point indication

1 2 3 4

Wire disconnection check function: OFF

No indication of the decimal point on digital(Setup through the combinations monitor ③: 10000of switches 3 and 4)

Table 3-5
ON/OFF switching for dip switches is possible when the amplifier is turned on.
３－１０

3.6 Cases
3.6.1 Names of Case Elements

AC Power Input
AC Power Fuse

Interface Connector

DC Power Input

DC Power Fuse
Ground terminal

Fig.3-7・Use standard AC power cord (47326) that is attached to the case as a standard for 100 VAC
power supply.
・Use optional DC power cord (47229) for DC power supply.
3.6.2 How to Use CaseA) Power supply cable connection
When using a battery (12 VDC, or 10 to 30 VDC) for power supply with amplifier units being
installed in a case, take into account the voltage drop caused by the DC power cord length andwire diameter. When using several channels or a long power supply cord, a voltage drop occurs.
This voltage drop may cause the power supply voltage to be lower than the allowable power
supply voltage of 10 V at DC power input connector.
For example, the DC power supply cord (47229) has a core area of 1.25 mm 2. If eight
amplifiers are mounted, a current of 3.2 A (0.4 A x 8) flows, and a voltage drop of 0.5 V will occur if
the cord is extended to 10 m. If a 10-m cable with 0.75 mm2 is used, a voltage drop of 1.65 V will
occur. For use under such conditions, the power supply should be provided with the voltage drop
taken into account, or the wire diameter or cord length of the power cord should be modified.

B) Synchronization between units and cases
When several units are mounted in the case, wires for signals are connected inside of the case.
BAL, calibration value application, or key lock can be made for all units in the case using the BAL
switch, calibration application switch, or key lock switch for all channels positioned on the front
panel.
Moreover, the synchronization is also available by connecting cases using the synchronization
cable (Figure 3-8).

３－１１

Figure 3-8 Rear Panel of caseC) Balancing for all units ①
Hold down the switch for BAL for all units ①. You can execute the wire disconnection check,wire length adjustment, and auto-balancing for all units in a case. For a wire disconnection check
and wire length adjustment, ON/OFF setting (selectable with dip switches) for each unit is also
effective. Auto-balancing is made for all amplifier units. This function is available for all amplifier
units installed in two or more cases, which are connected to each other with a synchronization
cable. To perform auto-balancing for one unit, press the BAL knob ④ for that unit.
Switch for balancing for all units ①:
Bridge check, cable lengthcompensation, and auto-balancing

Switch for application of calibration
values to all units ②

Key lock switch for all units ③
Case power supply switch ④

Figure 3-9 Front Panel of case
３－１２D) Switch for application of calibration values to all units ②
Hold down the switch to apply calibration value ②. A calibration value is set to all amplifier
units. This switch has priority over the calibration value application switch ⑭ in each amplifier unit
regardless of the position of the switch (+  -). This function is available for all amplifier units
installed in two or more cases, which are connected to each other with a synchronization cable. To
apply a calibration value to only one unit, use the calibration value application switch ⑭ in each
unit. Before doing so, confirm that the switch for applying the calibration value to all units is set toOFF.
E) All unit key locking switch ③
Key locking is made for all amplifier units in a case by pushing up (ON) the key locking
switch for all units ③. In this case, the all units key locking LED comes on. While key locking iseffective, the BAL switch for all units ① positioned in a case, BAL knob ④, measuring range
selection knob ⑧, measuring range fine-tuning knob ⑨, calibration value selection knob ⑫, andfilter selection ⑯ that are positioned on the front panel of each amplifier unit do not function. To
cancel the key locking, hold down the key locking switch for all units ③. In this case, if key locking
is set in each amplifier unit, the key locking status is maintained. This is applicable when two or
more cases are being used.

F) Remote box
The same operations are available when a small control box like in Figure 3-10 is used. The
BAL switch should include a locking mechanism in order to avoid erroneous operations. Use amomentary switch accordingly.

⑦GND

Case/Interface Connector Pin Alignment
③BAL
②CAL－

①CAL＋

Remote Box

①＋ＣＡＬ

②－ＣＡＬ

③ＢＡＬ

④ＯＳＣ

⑤ＧＮＤ

⑥KEYLOCK

⑦ＧＮＤ

⑧Ｎ．Ｃ

⑨Ｎ．Ｃ

Table 3-6 Interface Connector
Figure 3-10 Remote Box Overview

at Rear Face of Case

CAUTION
Table 3-5: The pins #4 and #5 of the interface connector on the back caseare not used for the DC strain amplifier.

They are for the synchronization

signal connector pin of the AC strain amplifier.
３－１３

3.6.3 Heat Release for CaseA) Using standalone rack-mounting case

CAUTIONAs a rack-mounting case does not have legs, avoid placing it on a desk or floor. Otherwise, heatcannot be released, resulting in damages to amplifiers. It should be properly mounted.

Rack-mounting case

20mm and overFloor or Desk
Figure 3-11 Rack-mount Case InstallationB) Using two or more rack-mounting cases
In this case, install fans following the criteria below because the temperature in the unit rises
depending on the number of stacks in the rack, load, and ambient temperature.

Number of caseNumber of fan unit

Note

under severe condition

What are harsh environmental conditions?

1-3

1- Power supply: 110 VAC(+10%)

3-6

2- Output voltage and current: +10V, 10mA

6-9

3

- Ambient temperature: +50C

Table 3-7 Number of Fan for Heat Release and Rack-mount
Case

３－１４

8CH Rack-mounting caseCabinetFan unit A
Fan unit B

Figure 3-12 Disposition of fan
If fan unit A may prevent upward air flows (when the depth differs as shown with a slant),
fan unit A should be mounted directly above this position. Through this fan layout, fan unit A
ventilates, and fan unit B enhances natural convection. One fan unit B should be installed forevery three cases. It should be mounted as close to a case as possible. When a user preparesfans, ask NIPPON AVIONICS in advance how to mount the fans.

３－１５

４. MEASUREMENT
4.1 Cautions before Measuring (Refer to Table 4.1)
Before starting measurement, check the following points:
Items

Cautions

Reasons

Installation

The joints must be soldered, andPrevents poor connections, noise,

environment

the connectors must be properly connected.

and instability in operation.

for strain gauges

The insulation resistance of strain gauges must Prevents instability in operation as welland bridge box

be equal to or greater than 60 M.

as noise from entering the equipment.

Installing the bridge box and strain gauges in Prevents noise from entering
the presence of strong magnetic or electric the equipment.
fields must be avoided.
Install the bridge box and strain gauges in Prevents instability in operation.
environments where there is as little moisture
as possible and the ambient temperature is not
high.
The leads that connect strain gauges to the Prevents reduction in the gauge factor andbridge box should be as short as possible and deterioration in output linearity.
should be shielded.

Prevents noise from entering
the equipment.

The interconnecting cable, which connects the Prevents a bridge voltage drop,
bridge box to the AS amplifier unit, should be which may result in an error between
as short as possible. (The AS amplifier the signal and the internal calibrator.
automatically compensates for bridge voltage
drops with its cable length compensation.)
Installation

The amplifier system must be used inenvironment

environments where the ambient temperaturefor dynamic

ranges from -10 to +50C and the ambient

strain amplifier

humidity ranges from 20 to 85% RH

system(with no condensation).

Prevents instability in operation.

Install the amplifier system

Prevents damage and noisein environments where accelerationfrom entering the equipment.

of mechanical vibrations is less than
3 G (3000 rpm, 0.6 mm P-P )Installing the amplifier system in the presence Prevents noise from enteringof strong magnetic or electric fields must be the equipment.
avoided.

４－１

The housing case must be properly grounded Prevents noise from entering(when the system operates on AC power).

the equipment.

Operation of

Select the bridge supply voltage in accordance Prevents measurement errors due

dynamic strain

with the strain gauge to be used.

to generation of heat in strain gauges.

amplifier system.

The connectors must be properly connected.

Prevents instability in operation andpoor connections.

Care must be taken not to smear the input Prevents instability in operation andconnector with oil, dirt, or anything else.

poor connections.

Verify that the power supply voltage is within If the supply voltage is less than the lower
the range of specifications.

limit, failures in operation may occur.

AC: 85 – 132 V, or 198 – 264 V

If the supply voltage is higher than

DC: 10 – 30 V

the specified upper limit, heat may be

Check that the polarity of the battery is correct,

produced, which may result in damaging

especially when 12 VDC is used.

electronic components.
If the polarity of the battery is not correct, theamplifier system will not operate.
(However, the system and the battery will
not be damaged though.)

Do not apply pressure to strain gauges when Applying pressure to strain gauges in auto
units are in the auto balancing mode.

balancing mode causes the bridge to beunbalanced.

Do not turn the measurement range selector Prevents changing the amplitude of acontrol ⑧or the measurement range

preset calibration value.

fine adjustment control ⑨during
measurement. (Use the keylock function.)
Before using a low-pass filter, the operator Prevents reducing amplitude andshould be familiar with its characteristics.

the occurrence of phase differences.

Prevent short-circuit in the output cable.

The power supply may be disabled, andheat will be generated in the circuitry.

Countermeasuresagainst noise

1. Use shielded wires as leads connecting strain gauges and connect the metal shields of thewires to terminal E on the bridge box.
2. Connect the ground terminal of the bridge box to terminal E and the base metal.
3. Ground the output common.
Performing all of or any of the above steps, 1, 2, and 3, may be effective for noise reduction.

Table 4-1 Causations before Measuring４－２

4.2 Input Connection
4.2.1 Examples of Strain Gauge Bridge Configurations
When incorporating one or more strain gauges into the four arms of a bridge, a quarter-, halfor full-bridge configuration can be used. These configurations can further be classified into same
sign equivalent values, different sign equivalent values, and different sign constant proportional
values according to the type of strain applied to the strain gauge(s). In addition, by effectively
utilizing the characteristics of the bridge, measures can be taken to compensate for the effect oftemperatures, eliminate errors, or increase the output.
This section describes examples of bridge configurations that are generally used. The following
symbols are used:
R: Resistance of fixed register ()Rg: Resistance value of strain gauge ()Rd: Resistance value of dummy gauge ()r: Resistance value of lead wire ()e: Output voltage from bridge (V)K: Gauge factor of strain gauge to be used (2.00)
: Amount of strain applied (m/m)
E: Bridge excitation voltage (V): Poisson’s rate of an object to be measured
For information on how to cement strain gauges and on the characteristics of strain gauges,
refer to the technical manuals provided by the strain gauge manufacturers, or “Strain
Measurement I” or “Strain Measurement II” published by the Japanese Society ofNon-destructive Inspection. The wiring methods of the bridge boxes shown in Table 4 are applied
where bridge box 5370 is used.

４－３

Circuits

BridgeExamplesConfigurations

Bridge Box Wiring

Remarks

Methods-Suited for where simple tension,
compression, or bending force
is applied

One-gauge-Suited for where changes in
configuration
ambient temperature are small-Calculated using the calibration
value as it is-Suited for where simple tension,
compression, or bending force
One-gauge,

is applied

three- wire

-Strain-gauge-lead wires are

configuration

temperature-compensated.
-Calculated using the calibration
value as it is-Suited for where simple tension,

one-active

compression. or bending force

gauge,

is applied

one-dummy-Temperature compensation

gauge

using a dummy gauge

configuration-Calculated using the calibration
value as it is-Suited for where simple tension,
compression, or bending force

Two-active

is applied

Gauge-Temperature compensation

configuration-Calculated using calibrated
value x 1/ (1+). or
signal value x 1/ (1+)-Detects bending strain-Eliminates tension andTwo-active
compression strain
Gauge-Temperature compensation
configuration-Calculated using calibration
value x 1/2 or signal value x 1/2

Table 4-2 Wheatstone Bridge Connections (1)４－４-Detects tension andcompression strain
Opposite-arm,-Eliminates bending strain
two-active-gaug-Effects of changes inetemperature are doubled
configuration-Calculated using calibration
value x 1/2 or signal value x 1/2-Detects tension andcompression strain-Eliminates bending strain
Opposite-arm,-Effects of changes in
two-active ,temperature are doubled
three-wire-Strain-gauge-lead wires are
configuration
temperature-compensated.
-Calculated using calibration
value x 1/2 or signal value x 1/2-Detects tension andcompression strain-Eliminates bending strain
Four-active-Temperature compensation
gauge-Calculated using calibrated
configuration
value x 1/ 2 (1+). or
signal value x 1/ 2 (1+)-Detects bending strain-Eliminates tension and
Four-active
compression strain
Gauge-Temperature compensation
configuration-Calculated using calibration
value x 1/4 or signal value x 1/4-Detects torsional strain-Eliminates tension,
Four-active
compression, and bending strain
Gauge-Temperature compensation
configuration-Calculated using calibration
value x 1/4 or signal value x 1/4

Table 4-2 Wheatstone Bridge Connections (2)４－５

4.2.2 Bridge Box
The bridge box comprises a terminal box, a cable, and a connector. The terminal box has
terminals for connecting strain gauges and contains three high-precision resisters (e.g., 120 
for 5370). The bridge circuit is formed by connecting one strain gauge or more to the terminals.
The following four types of bridge boxes are now available.

General-size
For 120-5370

For 350-

5373

Table 4-3 Type of Bridge Box(1) Installationa. Install the bridge box in an area as close to the measurement point as possible.
b. The bridge box may be secured with screws using the screw holes shown in Fig. 4-1, as
needed.
c. Avoid installing the bridge box where it will be exposed to high humidity, excessive
temperature changes, or strong electric and magnetic fields.
d. When the bridge box is installed, secure the interconnecting cable, if possible, andconnect it to the amplifier unit.
(2) Connections to bridge box (5370/5373/5379/5380)

A

Bridge Power

D

E

B
C

C

B

A

D

E
Bridge Output

Mounting Hole
Ground Terminal

Figure 4-1 Bridge Box Overview
Bridge Power
電源
D

C

B

A
E

Bridge Output
Figure 4-2 Bridge Box Connection
４－６

a. As shown in Fig. 4.1, pins A and C are provided for the bridge power supply, and pins B and
D are provided for the input to the amplifier unit. Pin E is the common terminal.
b. This is a bridge for measuring strain. Various methods are used for connecting strain
gauges.
For details on these connecting methods, refer to “Examples of Strain Gauge Bridge
Configuration” on page 4-3. When using various types of transducers via the bridge box,
make connections as shown in Fig. 4.2.
c. If the cable from the bridge box or a transducer to the amplifier unit is long, the bridge
voltage will drop due to the conductor resistance of the cable as shown in Table 4.4.
Because the output voltage from the bridge deviates from the calibration (CAL) value due tothe bridge voltage drop, the calibration value must then be corrected. For information on how
to correct it, refer to “Correction of Calibrated (CAL) Value” on page 4-10. The amplifier,however, has (standard) cable length correction that provides a proper bridge voltage taking
the conductor resistance of the cable into account. This enables precision measurements
without having to pay attention to the difference between the output voltage and thecalibration (CAL) value. For information on how to correct the value, refer to “Correction of
Calibrated (CAL) Value” on page 4-15.
As the amplifier can supply the bridge voltage in which cable conductor resistance isconsidered thanks to the wire length adjustment function (standard), accurate measurement
can be made without regarding the error between output voltage and calibration value.

Length from the amplifier to bridge box (m)Bridge resistance

20m

50m

100m

200m

60Ω

-2.4

-5.8

-11.0

-19.9

120Ω

-1.2

-3.0

-5.8

-11.0

350Ω

-0.4

-1.1

-2.1

-4.1

500Ω

-0.3

-0.7

-1.5

-2.9

1000Ω

-0.1

-0.4

-0.7

-1.5

Table 4-4 Bridge Voltage Drop Rate (%) (0.5 mm2 wire, +20C)
For how to adjust, see 4-15 Calibration Value (CAL) Correctiond. Make connections by screwing and soldering when Models 5370 or 5373 are used.
e. If the lead wires from strain gauges to the bridge box are long, the gauge factor will become
apparently lower and the output linearity will deteriorate, even when the bridge has been
initially balanced. The lead wires, therefore, should be as short as possible (2 m or less). The
gauge factor of a strain gauge supplied with lead wires attached has been calibrated together
with the lead wires. Do not cut them or add other lead wires.
４－７

4.2.3 Measurement with Transducer
In most strain-gauge-based transducers, the physical amount to be measured is applied to anelastic part, and the resulting deformation is converted into an electrical amount.
This elastic part is called the sensing part. The sensing part is made of material which
exhibits a higher limit of proportionality and less creep and hysteresis. A strain gauge iscemented on the sensing part, connected so as to form a bridge, temperature-compensatedand anti-humidity. For details on various types of transducers, refer to the technical manuals
provided by manufacturers.
(1) Connection of transducer to the amplifier unit
When using various types of transducers with the amplifier unit, make connections as shownin Fig. 4.3. Fig 4.4 shows cables that are used for directly connecting various types oftransducers to the amplifier unit. A&D’s interconnecting cables and extension cables are
manufactured in accordance with the specifications for input connectors of strain gauges
specified by the Japanese Society of Non-destructive Inspection.
D
A

Bridgeブリッジ電源
Excitation

E

B
C

A

D

C

出力
Bridge Output

B

Bridge Out
ブリッジ出力入力

Bridge Input
Fig. 4.3. Connection of Transducer

Extension Cable :47231

Relay Cable:47230
Fig. 4.4. Connection Cable(2) Operating precautions on use of transducers
a. Unstable and loose attachment of a transducer may cause malfunctioning of the amplifier
unit or noise. Transducers should be securely fixed after referring to manufacturer’s
operation manuals.
b. Although transducers and their connectors are generally moisture-proof, they should beplaced to avoid water and rain so that insulation can be maintained.
c. Even though the cable from the amplifier unit to the transducer is long, precision
measurements can be taken because of the cable length correction feature. (Refer topage 3.6.)
d. A transducer to be used must be a type on which the common (E) terminal of the amplifier
unit will not be connected to another terminal (A, B, C or D).
４－８

e. Do not place transducers and their interconnecting cables where they will be exposed tostrong electric and/or magnetic fields.
f. Table 5 lists the maximum bridge voltage that can be applied to the transducer, which is
calculated based on the bridge allowable current and drift. For more details, see
instruction manual.

Bridge resistor

Bridge voltage (B/V)

60Ω

Within 2V120Ω

Within 3V

350Ω

Within 10V

500Ω

Within 12V

1000Ω

Within 12V

Table 4-5 Bridge Resistance and Bridge Voltage
4.2.4 When using AS Series amplifier as DC amplifier
The AS Series amplifiers are measuring instrument but can be used DC amplifier, too.
(1) When the amplifier is used as DC amplifier using a bridge box
In this case, CMRR drops slightly.
WireD

Shield wire

－

＋
C

B

A

ShieldE

Figure 4-5(2) When the amplifier is used as DC amplifier using a DC amplifier cable (47228)

Red

Red

White

White

Internal shield
SignalInternal shield
ShieldFigure 4-6

Figure 4-7
４－９

(a) When using amplifier with one-side wire grounded
The output from amplifier in Figure 4-6 is common mode output. Noises from commercial
power supply (hum) may be regarded as a signal, and is amplified and output. To makeinverse phase output, connect red wire and white wire inversely. If noses from power supply
comes to mixed in, make the red wire as short as possible.
(b) When using amplifier for differential input
As this amplifier is an differential input amplifier, common mode voltage eCMV (±5V) does notappear as an output. Only the difference between e1 and e2 will be amplified.
(3) Cautions when usinga) The allowable input voltage is ±8V or lessb) The common mode voltage is ±5 V or lessc) For the relation between input range and gain, refer to the following tables.

AS2503
Measuring range(Measuring range
LED ⑪)

Measuring range (Gain)

Input range

Fine tuning knob ⑨

Gain

1k

1-2X Continuous tuning±1mV- ±2mV

10,000X - 5,000X

2k

1-2.5X Continuous tuning±2mV- ±5mV

5,000X - 2,000X

5k

1-2X Continuous tuning±5mV- ±10mV

2,000X - 1,000X

10k

1-2X Continuous tuning±10mV- ±20mV

1,000X - 500X

20k

1-2.5X Continuous tuning±20mV- ±50mV500X - 200X

50k

1-2.5X Continuous tuning±50mV-±125mV

200X - 80X

AS2603
Measuring range(Measuring range
LED ⑪)

Measuring range (Gain)

Input range

Fine tuning knob ⑨

Gain

2k

1-2.5X Continuous tuning±2mV- ±5mV

5,000X - 2,000X

5k

1-2X Continuous tuning±5mV- ±10mV

2,000X - 1,000X

10k

1-2X Continuous tuning±10mV- ±20mV

1,000X - 500X

20k

1-2.5X Continuous tuning±20mV- ±50mV500X - 200X

50k

1-2X Continuous tuning±50mV-±100mV

200X - 100X

100k

1-2.5X Continuous tuning±100mV-±250mV

100X - 40X

Table 4-6 Input Range and Gain
４－１０

The input ranges of AS2503 and AS2603 are ±１２５mＶ for the gain of 80X and ain oＶ for thegain of 40X. To input high voltage than those voltages, use 1/100 attenuator probe (47322).
However, the frequency response will be DC to 30 kHz when the attenuator probe is used.
A calibration value can be applied when the amplifier is used as an DC amplifier. For με
CAL, the amplifier can be used by reading the unit of με as μs by setting BV to 2V.

４－１１

4.3 Connection of Output to Load
Two types of outputs are available; ＯＵＴＰＵＴ １ and ＯＵＴＰＵＴ ２.
(1) OUTPUT 1

３

Delivers a voltage of +/-10 V and a current of +/-5 mA (into a load of 2 ｋ or more), allowing
voltage-input type instruments such as thermal dot recorders and data acquisition devices tobe connected to OUTPUT 1.
Thus output is displayed on the monitoring meter(2)OUTPUT 2.

４Delivers a voltage of +/-10 V and a current of +/-10 mA (into a load of 332  or more).
The output voltage of OＵＴＰＵＴ２ can be varied from +/-10 V to approximately +/-1 V withthe level adjustment control ⑱. Because this output can be displayed digitally on the digitalmonitor ③, it can also be displayed as a physical amount by adjusting the output voltage(scaling).
4.3.1 Connection of Output to Data RecorderSpecial care must be taken with the input level of data recorders. Especially withfrequency-modulated data recorders, if an input signal greater than the allowable input level ofthe data recorder is applied, it may be overmodulated, causing failure in recording. To avoid
this, the amplifier unit is capable of displaying excessive output voltage.
As shown in Fig. 4.8, if the input signal exceeds the threshold level (approximately +/-10.5 V),
an LED located on the right or left side of the reading blinks for a certain period of time. An
excessive level up to a frequency of approximately 1 kHz can be checked on the monitoring
meter ②.

Appx.10.5V
10V

AS Amplifier
0V

Ｌ0

R0

Data Recorder
Voltagedividing circuit
R0

R1
R2

-10V
Appx.-10.5V

Figure 4-9

Figure 4-8

４－１２

Ri

Ci

Care must be taken concerning the following points for connection to a data recorder.
(1) Where direct connections can be madeIf a data recorder is capable of accepting a signal of more than 20 Vｐ-ｐ (+/-10V), it can bedirectly connected to the amplifier unit.
(2) Where a voltage divider is required
If the input level of a data recorder is +/-1 V, a voltage divider is required. Pay due care to
the impedance.
In general, since the output impedance increases as the frequency band becomes higher, it
is expressed as: Ｒ0（）+Ｌ0（H）.
If a voltage divider is inserted as shown in Fig. 4.7, this will cause errors, as described in thefollowing example.
Example:Errors will be caused as shown in Table 4.7, if the voltage dividing ratio is 1/10 under thefollowing conditions:
Input impedance of data recorder: Ｒｉ=100 ｋ, Ｃｉ=100 ｐＦ
Output impedance of the amplifier unit: Ｒ0=１, Ｌ0=200 Ｈ

R1

R2

(kΩ)

(kΩ)

Errors caused by voltage divider (5)
DC

1kHz

2kHz

5kHz

10kHz

90

11.1

-0.08

-0.08

-0.09

-0.12

-0.24

9

1.01

-0.02

0.02

-0.02

-0.02

-0.02

Table 4-7 Error Caused by Voltage Divider
4.4 How to Read Measured Values
This section describes how to read the measured values of a waveform recorded on a dataacquisition device or recorder.
B

b
Ａ
a

Waveform
CAL value

Measurement

４－１３

Figure 4-10

b (Amplitude at point B)
Measured value at point B={a (Amplitude of calibration value)} x Set CAL value(1) Measurement with strain gauges
Set CAL value: 500 m/m
Deflection of CAL waveform: 10 mmDeflection at point B: 22 mm
Amount of strain at point B =｛22/10｝ x 500 m/m
=1100 x m/m
Where the measurement is based on the quarter-bridge configuration with a gauge factorof 2.00.
(2) Measurement with various types of transducers
This calibration voltage value is linked with the bridge supply voltage, and the amount ofcalibration can always be applied with any panel-indicated value (1 m/m to 9,999 m/m).
Example:If a load cell with a rated capacity and a rated output of 1 ton and １ mV/V is used, toconvert the rated output of １ mV/V into an amount of strain, the rated output is given by:
1 ｍＶ/Ｖ x 2Ｖ = 2mＶ
Where the load cell is used with the bridge voltage (E) = 2V.
If the measurement is based on the quarter-bridge configuration with a gate factor (K) of
2.00, the relationship between the amount of strain () to be applied to the bridge and theoutput voltage (e) is given by:
e = 1/4 x Ｋ x Ｅ x  = 1/4 x 2 x 2 x  = That is, 1 m/m strain corresponds to 1 V and 1000 m/m to 1 mV. The rated output of 2 mVcorresponds to 2000 m/m. As a result, the relationship between calibration values and thephysical amount is as follows irrespective of the bridge supply voltage:

Strain calibration value
2000×10ｰ6

Physical value calibration value
1ton× 1strain=1ton

1000×10ｰ6 strain

1ton×1/2 =500㎏

ｰ6

500×10 strain

1ton×1/4 =250㎏

200×10ｰ6 strain

1ton×1/10 =100㎏

Table 4-8

４－１４

The formula is as follows:-6

Calibration value of physical amount =Calibration value for 10 strain of the amplifier-6

Rated output value (10 strain)x Rated capacity

The physical amount can be calculated as follows:
Calibration value of physical amount: 250 kg (500 m/m）
Deflection of CAL waveform: 10 mmDeflection at point Ｂ: 22 mm
The physical amount can be calculated as follows:
Load at point Ｂ =22
10x 250 kg = 550 kg

4.4.1 Correction of Calibration (CAL) Values(1) Where gauge factors are not 2.00
In this amplifier unit, its gauge factor is set to 2.00. If strain gauges with a gauge factor otherthan 2.00 are to be used, the following formula must be used.
True CAL value =2.00
Kc (Gauge factor of strain gauge)

x CAL value of unit

(2) Where bridge configurations are not quarter-bridge configuration
The calibration (CAL) values of this amplifier unit are equivalent voltage values based on the
2.00 gauge factor and the quarter-bridge configuration. The calibration values based on half- or
full-bridge configurations can thus be obtained by referring to the next table.
The relationship between the bridge supply voltage and bridge output voltage can be
represented by the following formula:ｅ = (K x  x Ｅ x Bridge configuration)/4
Where: Ｋ; gauge factor
; Amount of strain (10 m/m)
Ｅ; bridge voltage

Gauge configuration

Real calibration value

One active one dummy

Calibration value on panel ×１

Two active

Calibration value on panel ×1/2

Opposite arm two active

Calibration value on panel ×1/2

Four-gauge

Four active

Calibration value on panel ×1/4

Transducer

Four active

Calibration value on panel ×１(*)

Two-gauge

Table 4-9

４－１５

For details, refer to the remarks in the “Wheatstone Bridge Connections Table”
on pages 4.4-4.5.
*Although transducers are generally based on the full-bridge configuration, their output is madeto match the quarter-bridge configuration.
(3) Where the distance from the bridge box to the amplifier unit is longIf the cable from the bridge box or a transducer to the amplifier unit is long, the bridge supply
will drop due to the conductor resistance of the cable. This causes errors between the bridge
output voltage and the CAL value. For obtaining the voltage drop rate, refer to “Bridge Voltage
Drop Rate” on page 4.7 or measure the voltage drop rate between terminals A and C on thebridge box, using a voltmeter.
Example:If the cable length is 100 m and the strain gauge resistance is 120  under an ambient
temperature of 20C, the bridge supply voltage will be reduced by 5.8% between terminals A
and C, which can be obtained from the “Bridge Voltage Drop Rate Table” on page 4.6. The true
calibration value can thus be given by:

Voltmeter
True calibration value＝１
１－０．０５８×

Calibration
value on display

AC Voltage
Measurement
D

C

B

A

Bridge box

E

Figure.4-8 Voltage measurement on bridge box

Such measurement and adjustment are not needed in AS series
amplifiers thanks to wire length adjustment (Page 3-8).

４－１６

4.5 Special Applications
This section introduces examples that configure two or more bridges using a single power
supply and calculate value of addition, average, and subtraction using several transducers.
4.5.1 Configuring two or more bridges using a single power supply
Dynamic strain amplifier

Ｄ
ＣＡ

Output
Ｂ
Ｄ

Ａ

Ｅ

Ｃ

OutputPower supply

Ｂ

Ｅ

Ｄ
Ａ

Ｃ

OutputＢ
Ｅ

Figure 4-12
Connect the E terminal of each bridge box. If the power is supplied separately, connect eitherof the power to the E terminal of the bridge box. The power supply should not exceed thecommon mode voltage (5V).
4. 5. 2 Special use of transducer(1) When calculating value of addition (Figure 4-13)
Separate power supply is needed for E1, E2 and E3. In this case, 50 Hz or 60 Hz noise fromcommercial power supply will affect the measurement. To minimize the influence of the noise,
add a capacitor.
(2) When calculating value of subtraction (Figure 4-14)
Separate power supply is needed for E1 and E2. Also, in this case, 50 Hz or 60 Hz noise fromcommercial power supply will affect the measurement. To minimize the influence of the noise,
add a capacitor.

４－１７

Ｄ

Dynamic strain amplifier

Ｄ

Ｃ

Ａ

Dynamic strain amplifier
Ｃ

Ａ
Ｅ1

Ｂ
Ｄ

Ａ

Ｅ1

Ｂ

Ｃ
Ｄ
Ｂ

Ｅ2
Ｄ

OutputＣ

Ａ

Output

Ｂ
Ｅ2

Ａ

Ｃ

Ｅ

Ｂ
Ｅ3

Ｅ

Figure 4-13

Figure 4-14

(3) When calculating value of mean (Figure 4-15)
Dynamic strain amplifier

Ｄ
ＣＡ

Output

Ｂ
Ｄ
Ａ

Ｃ
Ｂ

Ｄ
Ａ

Ｃ
Ｂ

Figure 4-15

For use as above figures 4-13 to 4-15, rated capacity needs to be equal
if using transducers, and special attention is required on capacity ofthe bridge supply if using dynamic strain measuring equipments.

４－１８

５. Operation Theory
5.1 Flow of Measurement Signal (Refer to figure 5-1)
Input
Selectiom

HEAD
AMP

RANGE RANGE
ATT
FINE

2nd
AMP

OUTPUT1

ＨＰＦ

A
E

B
C

D

OUTPUT2
ＬＰＦ
Bridge Check
Cable Length Compensation
Calibration
Voltage
Generator

Analog to Digital
Converter

Ｌｅｖｅｌ Meter(17 dot LED)
Digital Monitor(Four digits 1/2 LED)

ＣＡＬ
ＣＰＵ

Resistance
Unbalance
AdjustingCircuitKey Ｏｐｅｒａｔｉｏｎ

Ｒ ＢＡＬ
BridgePower Supply
（ＢＶ）

５Ｖ

ＣＡＬ Ｍｏｎｉｔｏｒ

I/F
Connector

DC１２V
AC100V（85～132V）
AC200V（180～264V）
SELECT

Ｉｓｏｌａｔｅｄ
Ｐｏｗｅｒ Ｓｕｐｐｌｙ

Figure 5-1 AS2503 Block Diagram

INPUT
Selection

HEAD
AMP

RANGE RANGE
ATT
FINE

2nd
AMP

SignalIsolation Circuit

ＬＰＦ

OUTPUT1

ＨＰＦ

A
E

B
C

D

OUTPUT2
Bridge Check
Cable Length Compensation
Calibration
Voltage
Generator

Analog to Digital
Converter

Ｌｅｖｅｌ Meter(17 dot LED)
Digital Monitor(Four digits 1/2 LED)

ＣＡＬ
ＣＰＵ

Resistance
Unbalance
AdjustingCircuitKey Ｏｐｅｒａｔｉｏｎ

Ｒ ＢＡＬ
５Ｖ

BridgePower Supply（ＢＶ）

ＣＡＬ Ｍｏｎｉｔｏｒ

I/F
Connector

Ｉｓｏｌａｔｅｄ
Ｐｏｗｅｒ Ｓｕｐｐｌｙ

Ｉｓｏｌａｔｅｄ
Ｐｏｗｅｒ Ｓｕｐｐｌｙ

DC１２V

AC100V（85～132V）
AC200V（180～264V）
SELECT

Figure 5-2 AS2603 Block Diagram

５－１

The signal fed from the bridge box or a transducer is applied to the INPUT connector
product and amplified through High impedance and low zero-drift preamplifier.

１of thisTo this preamplifier are added the outputs of a 4-digit digital calibration voltage generating circuit(CAL), a resistance unbalance adjusting circuit (R BAL) and a capacitance unbalance auto
eliminating circuit (C BAL), only the signal of which is fed to the subsequent stage.
The signal which has been amplified through a main amplifier, and then outputted via a
LPF(Low-pass Filter) and HPF(High-pass Filter) at AS2503.
The signal which has been amplified through a main amplifier, and then outputted via a signal
isolation circuit and LPF and HPF at AS2603.
There are two output systems: the output of OUTPUT 1
the output of OUTPUT 2

４

３

is displayed on a level meter ②, while

is displayed on a digital monitor ③.

５－２

６. Optional Functions
6.1 Case Function and Type
Number of CH

TYPE

４ＣＨ

AS16-104

６ＣＨ

AS16-105

８ＣＨ

AS16-106

８ＣＨ

AS16-107

Bench-top Case

Rack-mounting Case

Table6-1

Four Type of Case

We provide cases listed in Table 6-1. Select the case based on the number of channel to be used.
6.1.1 Accommodating Amplifier Units
When accommodating amplifier units into a case, first the slit on the bottom of the unit should be
adjusted to the guide of the case. Press the amplifier unit slowly so that the power supply andinterface connectors are connected securely. After installing all amplifier units, fix them with twoscrews at the top and bottom of the front face an amplifier unit.
6.1.2 How to Mount Blank Panel
Blank panels are used to cover the area of a case where amplifier units are not installed. To fix thepanel to the case, use top and bottom screws.
6.1.3 Connecting Grounding Wire
When an amplifier unit is connected to a case, the protective grounding terminal, case protective
grounding terminal, grounding terminal of batch power supply connector are connected and have thesame potential.
The grounding wire should have AWG16 wire material and connected with a screw. Always connect
the grounding wire to ground.

WARNING
Always ground the protective grounding terminal for safety.
6.1.4 Caution on Rack-mount CaseA rack-mount case is a case that is used for accommodating a case to 19-inch rack. The rails on
the left and right should be placed on the rails of the rack, and then fix the case by using fourattaching holes. When using several cases, install a fan unit between cases in order to release heatand maintain amplifier accuracy.

CAUTION
Avoid placing a rack-mount case on a desk or floor as the rack-mount case is no provided
with rubber legs.

６－１

７. MAINTENANCE
7.1 Items to Be Checked
We ship our products after conducting quality control, which covers from design to manufacturing.
It is, however, possible that failures may occur in the products due to natural degradation,
components defects, or wire disconnection.
If a failure occurs, it is necessary to find the cause. In such case, check the following items andrefer to page 4-1. If the cause cannot be found, contact our sales agency. Before returning, be sure
to inform us of problematic points.

WARNING- Check the power supply voltage range
Power supply voltage range: 85 to 132VAC/180 to 264VAC
12VDC (10 to 30VDC)- Check input strain range
Input voltage range: 1,000×10-6 to 125,000×10-6 strain (for AS2503)
2,000×10-6 to 250,000×10-6 strain (for AS2603)- Check common-mode voltage
First check the power supply voltage.
Power supply voltagange：10 to 30VDC
85 to 132VAC, 50Hz or 60Hz

Symptom 1 The bridge is out of balance
Set the range to OFF using measuring range selection knob ⑧. (Measuring range LED⑪ comes on at OFF.)Is bridge voltage 2 V?

Does the green LED of level meter ② come on?
Yes

Ｎo： Adjustment for internal components of the amplifier unit is needed.

After adding the dummy resistor to the bridge box, set the measurement range selection
knob ⑧ to OFF. After that, turn to the direction of 1k to perform bridge balancing for eachrange sequentially.
Was the bridge balanced?
Ｎｏ

Yes：Make adjustment for a strain gauge, transducer, and input cable.

Check the bridge voltage and bridge circuit.
Isn’t the A or C terminal connected to the E terminal (common)?

Yes：Modify the connection.
No：Isn’t the output from the bridge, the B or D terminal, short -circuited to
the E terminal (common)?

Figure 7-1 Check Item Chart (1)７－１

Symptom 2 No signal is output.
Isn’t the measuring range set to OFF? (Doesn’t OFF illuminate on measuring
LED ⑪?)

Yes：Set measuring range to (50k to 1k(AS2503)),(100k to 2k(AS2603))
using measuring range selection knob ⑧. (See measuring range LED ⑪.)
No
Input a calibration value using calibration value input switch ⑭.
Is the level of level meter move?

No

Yes

Is the output cable of output connector 1(OUTPUT1) short -circuited?

Isn’t output cable disconnected?
No

Yes

Yes

No

Make a repair.

A failure in internal componentsof the amplifier unit

Symptom 3 The bridge is balanced but the zero position drift with time.
Press the surface of the strain gauge softly. Then, does the level of level meter ② move?

Yes： Remove the strain gauge and paste a new strain gauge.
No
Set the measuring range to OFF using measuring range selection knob ⑧ (OFF illuminates
on measuring LED ⑪.). Disconnect the bridge circuit from the amplifier unit, and thenmeasure the isolation resistance of the bridge circuit.
Does the isolation resistance have 60 M ohm?

Yes

No

Is the temperature compensation
for strain gauges made?

Possibly a lead accidentally
touch the ground line.

Yes：Adjustment of internal
components of theamplifier unit.

Does a lead touch the ground line?

No：Perform temperature compensation
for the strain gauge. Lower the bridge
voltageYes ：Make a repair.

No：Remove the strain gauge andpaste a new strain gauge .

Figure 7-1 Check Item Chart (2)７－２

7.2 How to Replace Fuse
Follow the following fuse replacement procedure.
1． Turn the power switch to off, and then disconnect input and output cables from the amplifier unit.
2． Place the amplifier unit so that the front of the unit to be left side, bottom of the unit to be in thefront, and the rear of the unit to be right side.
3． Use a flat-blade screw driver and turn the fuses to the arrow directions mentioned on the fuseholders. (See Figure 7-3, counter-clockwise)

Fuse for AC Power
Fuse for DC Power

Front panel

FUSE

Figure 7-2

FUSE

Figure 7-3

4． Replace the fuses at the front part of the fuse holders.
5． The fuse ratings are: 100 VAC and 125 mA for AC power fuse and 12 VDC and 800 mA time-lag
fuse (slow blowing) for DC power supply fuse. When replacing, be careful of AC and DC.
6． When installing fuse holder, use a flat-blade screw driver. When pushing the fuse, keep the fuseholder slit to be vertical to the amplifier unit (Figure 7-2, dotted line), and then press deeply andturn clockwise by 90 degree.

FUSE

Figure 7-4

Figure 7-5

7． Confirm that the fuse holder is fully installed in the amplifier unit as Figure 7-2. Also, confirm thatthe fuse holder slit (flat-blade screw driver contact portion) is parallel to the amplifier unit as
Figure 7-3.
8． The fuse replacement is completed. Examine why the fuse was brown. After taking measures,
turn on the amplifier.

WARNING
Power supply cord and input/output cable should be disconnected from the amplifier
unit. Always use fuses having specified ratings.
７－３

7.3 Changing AC Power Supply Voltage
Follow the steps below to switch the AC power supply voltage.
１. Turn off and disconnect the power supply cord and input/output cable from the amplifier unit.
２. Remove the cover using two screws (M3) on the top face (Figure 7-6).
３. The AC power supply selection switch is positioned at the location shown in Figure 7-7.
Selection to 200 VAC, OFF, and 100 VAC is available. Voltage switching is available by sliding
the switch to the target voltage position. The fuse can support both 100 VAC and 200 VAC. The
installed fuse (100 VAC/200 VAC, 100 mA: 0334-3006) can therefore be used for both supply
voltages.
４. Attach the amplifier cover so that the slit of the amplifier cover matches to the frame of theamplifier unit.
５. Fasten the screws of upper face. The fuse replacement is competed.
６. When using 200 VAC power supply, use optional AC power supply cord 200 V (Figure 7-8:
0311-5112).

Rear Panel

Front Panel

Figure.7-6

Figure.7-7

200V

OFF

100V

(Length: 3.5 m, bare wire)

Figure.7-8 AC Power Cable for 200V

WARNING
Power cord and input/output cable should be disconnected.
As the AC power supply cord 200 V (0311-5112) has bare wire at one end,
processing is needed to connect to the power source.
After switching the power supply voltage, change the power supply voltage rating indicatedon the plate on the amplifier cover.
７－４

８. SPECIFICATIONS
8.1 AS2503
Description

Item
Number of Channels

1 channel/unit

Bridge resistance

60 - 1,000 Ω

Gage factor

2.00

Bridge power voltage supply 2, 3, 5, 9, 10 VDCDisconnection check

Detecting disconnection and short of input bridge circuit (bridge impedance

functionof 120 Ω or larger) and displaying checked result by LED
Function ON/OFF is available by using the bottom setting SW

Cable length adjusting

Automatic adjusting of bridge power voltage drop according to a change ofcable length up to bridge circuit (bridge impedance of 120 Ω or larger).

function
Balance adjusting range

Function ON/OFF is available by using the bottom setting SW
Deviation of resistive value:±2%(±10,000 × 10-6 in strain) (Both in auto-balance and fine-tuning)

Balance adjusting accuracy Within ±1.0 × 10-6 in strain (RANGE = 50k, Without FINE, BV = 2V)
Maximum input range±125,000 × 10-6 in strain (RANGE = 50k, FINE = ×2.5, BV = 2V)

Voltage sensitivity±1,000 × 10-6 in strain (RANGE = 1k, Without FINE, BV = 2V)

Measurement range change 1k, 2k, 5k, 10k, 20k, 50k (× 10-6 in strain, × 2/BV in value), OFF
Fine adjustment

Internal calibrator

Continuously changeable in FINE RANGE,
2 step changing amount can be selected
Set value: ±1 - 9,999 × 10-6 in strain,
Accuracy: ± (0.2%rdg + 0.5×10-6 in strain)
Set value: ±0.01 – 99,99mV (±0.01 – 99,99mV at BV = 2V),
Accuracy: ± (0.2%rdg + 0.5×10-6 in strain)

Nonlinearity

Within ±0.1%/FS

Frequency response

DC to 500 kHz, +1, -3dB

High-pass filter

0.5Hz: 2-pole Bessel (Filter descent response: – 12 dB/oct)

Low-pass filter

10, 30, 100, 500, 1k, 3kHz, 4-pole Bessel(Filter descent response: -24dB/oct)Zero drift:

Stability

Sensitivity:

Within ±0.1 × 10-6 in strain/°C, Within ±0.5 × 10-6 instrain/24h
Within ±0.01%/°C, within ±0.05%/24h

TABLE 8-1 Specification list for AS2503 (1)

８－１

Item

Explanation-6

80 × 10 in strain p-p RTI(W/B, RANGE = 1k, Without FINE, BV = 2V, 120 Ω in bridge)
Noise level-6

20 × 10 in strain p-p RTI(DC – 30kHz, RANGE = 1k, Without FINE, BV = 2V, 120 Ω in bridge)
OUTPUT1 ±10 V ±5 mA, OUTPUT2 ±10 V ±10m A

OutputOutput impedance: 0.5Ω or less, Capacitive load: Operable up to 0.1 μF(For output current of 4 - 20mA: Load impedance: 500 Ω or less, Output
impedance: Approx. 5 MΩ, Voltage/current conversion accuracy: Within ±0.1%)

Output adjustment
Output monitor
display

OUTPUT2 ADJ (Can be independently varied continuously from 1 to 1/10)
17-dot LED display (OUTPUT1 monitor)
Green LED at center blinks when voltage is within approximately ±100 mV.
LEDs at both ends blink when voltage is greater than approximately ±10.5 V.
4 1/2 digital display (OUTPUT2 monitor), Scaling display available with

Digital display

OUTPUT2 ADJ
Accuracy: Within ±0.05% rdg ±1 count, Displaying location of decimal point canbe changed by using the bottom setting SW.
Turning the key lock ON/OFF by pressing the key lock button approximately for

Key lock function

one second.
(Except CAL switch and BV selection switch)

Setting value saving

Saving the value in flash memory. (Can be held without back-up battery)
2

Resistance to vibration

29.4m/s (50Hz, X,Y,Z, 10 minutes for each) and conforming to MIL-STD-810F
514.5C-1
1.5 kVAC, 1 minute, between each input terminal output and housing case
1 kVAC, 1 minute, between DC power input and input

Withstand Voltage

500 VAC, 1 minute, between DC power input and output or housing case(Insulation resistance)

AC power supply

85 - 132 VAC/180 - 264 VAC (Internal switch must be changed) 10 VA or lessDC power supply

DC10 - 30V, 7 VA or less

Operating environmental- 10°C - + 50°C, Within 20 - 85% RH, without condensation

conditions
Storage temperature range - 20°C to + 70°C, Within 10 - 90% RH
Outline dimension

H143 (±1.0) × W49.5 (±0.5) × D253 (±2.0) mm *Excluding protrusion

WeightWithin 1.4 (±0.1) kg

TABLE 8-1 Specification list for AS2503 (2)

８－２

Item

Explanation

Input impedanceApprox. 15 M + Approx. 15 M (DC)

Zero adjustment range

10 mV (RTI) (BV = 2 V) (incl. auto-balancing and fine-tuning)

Balancing adjustment
resolution
Measuring range

Within 1 V (RTI) (RANGE = 1k, without FINE, BV = 2 V)
.125 mV (input equivalent value) (RANGE = 50k, FINE = 2.5X, BV = 2 V)
10,000X (RANGE = 1k), 5,000X (2k), 2,000X (5k), 1,000X (10k), 500X (20k),

Gain200X (50k) (Without FINE)
0.1 %

Gain resolution
Common mode rejection
ratio (CMRR)
Maximum allowable input
voltageCommon mode allowable

70 dB or more (50 Hz or 60 Hz) at 1 k balanced input
8 VDC or AC peak value
5 VDC or AC peak value

input voltage
Internal calibrator
Linearity
Stability
Noise

Set value: 0.01 to 99.99 mV (0.01 to 59.99 mV at BV = 2 V)
Accuracy:  (0.2%rdg + 5 V)Within 0.01% FS
Zero point: Within 1V/C, 5V/24 hours
Sensitivity: Within 0.01%/C, 5%/24 hours
80 V p-p RTI (W/B, RANGE = 1k (1,000X), without FINE, BV = 2V)
20 V p-p RTI (DC to 30 kHz, RANGE = 1k, without FINE, BV = 2V)

TABLE 8-2 Specification List for AS2503 as DC Amplifier

８－３

8.2 AS2603
Description

Item
Number of Channels

1 channel/unit

Bridge resistance

60 - 1,000 Ω

Gage factor

2.00

Bridge power voltage supply 2, 3, 5, 9, 10 VDCDisconnection check
function
Cable length adjusting
function
Balance adjusting range

Detecting disconnection and short of input bridge circuit (bridge impedanceof 120 Ω or larger) and displaying checked result by LED
Function ON/OFF is available by using the bottom setting SW
Automatic adjusting of bridge power voltage drop according to a change ofcable length up to bridge circuit (bridge impedance of 120 Ω or larger).
Function ON/OFF is available by using the bottom setting SW
Deviation of resistive value: ±2%(±10,000 × 10-6 in strain)(Both in auto-balance and fine-tuning)

Balance adjusting accuracy Within ±2.0 × 10-6 in strain (RANGE = 2k, Without FINE, BV = 2V)
Maximum input range±250,000 × 10-6 in strain (RANGE = 100k, FINE = ×2.5, BV = 2V)

Voltage sensitivity±1,000 × 10-6 in strain (RANGE = 1k, Without FINE, BV = 2V)

Measurement range change 2k, 5k, 10k, 20k, 50k, 100k (× 10-6 in strain, × 2/BV in value), OFF
Fine adjustment

Internal calibrator

Continuously changeable in FINE RANGE,
2 step changing amount can be selected
Set value: ±1 - 9,999 × 10-6 in strain,
Accuracy: ± (0.2%rdg + 0.5×10-6 in strain)
Set value: ±0.01 – 99,99mV (±0.01 – 99,99mV at BV = 2V),
Accuracy: ± (0.2%rdg + 0.5×10-6 in strain)

Nonlinearity

Within ±0.05%/FS

Frequency response

DC to 500 kHz, +1, -3dB

High-pass filter

0.5Hz: 2-pole Bessel (Filter descent response: – 12 dB/oct)

Low-pass filter

10, 30, 100, 500, 1k, 3kHz, 4-pole Bessel(Filter descent response: -24dB/oct)Zero drift:

Stability

Sensitivity:

Within ±0.1 × 10-6 in strain/°C, Within ±0.5 × 10-6 instrain/24h
Within ±0.01%/°C, within ±0.05%/24h

TABLE 8-3 Specification list for AS2603 (1)

８－４

Item

Explanation-6

50 × 10 in strain p-p RTI(W/B, RANGE = 1k, Without FINE, BV = 2V, 120 Ω in bridge)
Noise level-6

20 × 10 in strain p-p RTI(DC – 30kHz, RANGE = 1k, Without FINE, BV = 2V, 120 Ω in bridge)
OUTPUT1 ±10 V ±5 mA, OUTPUT2 ±10 V ±10m A

OutputOutput impedance: 0.5Ω or less, Capacitive load: Operable up to 0.1 μF(For output current of 4 - 20mA: Load impedance: 500 Ω or less, Output
impedance: Approx. 5 MΩ, Voltage/current conversion accuracy: Within ±0.1%)

Output adjustment
Output monitor
display

OUTPUT2 ADJ (Can be independently varied continuously from 1 to 1/10)
17-dot LED display (OUTPUT1 monitor)
Green LED at center blinks when voltage is within approximately ±100 mV.
LEDs at both ends blink when voltage is greater than approximately ±10.5 V.
4 1/2 digital display (OUTPUT2 monitor), Scaling display available with

Digital display

OUTPUT2 ADJ
Accuracy: Within ±0.05% rdg ±1 count, Displaying location of decimal point canbe changed by using the bottom setting SW.
Turning the key lock ON/OFF by pressing the key lock button approximately for

Key lock function

one second.
(Except CAL switch and BV selection switch)

Setting value saving

Saving the value in flash memory. (Can be held without back-up battery)
2

Resistance to vibration

29.4m/s (50Hz, X,Y,Z, 10 minutes for each) and conforming to MIL-STD-810F
514.5C-1
1.5 kVAC, 1 minute, between each input terminal output and housing case
1 kVAC, 1 minute, between DC power input and input

Withstand Voltage

500 VAC, 1 minute, between DC power input and output or housing case(Insulation resistance)

AC power supply

85 - 132 VAC/180 - 264 VAC (Internal switch must be changed) 10 VA or lessDC power supply

DC10 - 30V, 7 VA or less

Operating environmental- 10°C - + 50°C, Within 20 - 85% RH, without condensation

conditions
Storage temperature range - 20°C to + 70°C, Within 10 - 90% RH
Outline dimension

H143 (±1.0) × W49.5 (±0.5) × D253 (±2.0) mm *Excluding protrusion

WeightWithin 1.4 (±0.1) kg

TABLE 8-3 Specification list for AS2603 (2)

８－５

Item

Explanation

Input impedanceApprox. 15 M + Approx. 15 M (DC)

Zero adjustment range

10 mV (RTI) (BV = 2 V) (incl. auto-balancing and fine-tuning)

Balancing adjustment

Within 2 V (RTI) (RANGE = 2k, without FINE, BV = 2 V)

resolution
Measuring range.250 mV (input equivalent value) (RANGE = 100k, FINE = 2.5X, BV = 2 V)
5,000X (2k), 2,000X (5k), 1,000X (10k), 500X (20k), 200X (50k), 100X (RANGE

Gain= 100k) (Without FINE)
0.1 %

Gain resolution
Common mode rejection

70 dB or more (50 Hz or 60 Hz) at 1 k balanced input

ratio (CMRR)
Maximum allowable input
voltageCommon mode allowable

8 VDC or AC peak value
5 VDC or AC peak value

input voltage
Internal calibrator
Linearity
Stability
Noise

Set value: 0.01 to 99.99 mV (0.01 to 59.99 mV at BV = 2 V)
Accuracy:  (0.2%rdg + 5 V)Within 0.05% FS
Zero point: Within 1V/C, 5V/24 hours
Sensitivity: Within 0.01%/C, 5%/24 hours
50 V p-p RTI (W/B, RANGE = 2k (5,000X), without FINE, BV = 2V)
20 V p-p RTI (DC to 30 kHz, RANGE = 2k, without FINE, BV = 2V)

TABLE 8-4 Specification List for AS2603 as DC Amplifier

８－６

９. REFERENCES
9.1 Frequency and Phase Characteristics

Frequency Characterristics of AS2503

Amplitude(dB)

10

10Hz

0

30Hz
-10

100Hz
1kHz

-20

30kHz
W/B(500kHz)

-30

-40
1

10

100

1000

10000

1000001000000

Phase properties of AS2503

Phase Delay (Degree)

0.0-100.0

10Hz
30Hz
100Hz

-200.01kHz
30kHz
W/B(500kHz)-300.0-400.0
1

10

100

1000

９－１

10000

1000001000000

Frequency Characteristics of AS2603
Amplitude(dB)

10

0

10Hz
30Hz

-10

100Hz
1kHz

-20
30kHz
W/B(100kHz)

-30

-40
1

10

100

1000

10000

1000001000000

Phase properties of AS2603
Phase Delay (Degree)

0.0

10Hz

-100.030Hz
100Hz-200.01kHz
30kHz-300.0

W/B(100kHz)-400.0
1

10

100

1000

10000

９－２

1000001000000

9.2 Cable List
N ame

Shape

Pin alignment

R ema rk

Bridge box

A…+BV

Length: 3m

TYPE

B…- Input

E x t e r n al

5370(120Ω)

C…-BV

5373(350Ω)

D…+ Input

di a m e t e rofcable Φ9.6
C o r e wi r e : 0 . 5 m m

2

E… Shield
Output cable

Red

TYPE: 0311-2057(Black mold)
TYPE: 0311-5084

Length: 2m…+ Output

Metal BNC

(BNC

- a l li g a to r c li p

core wire)(Red Mold)( + R e d , - Bl a c kBlack:A S a m p li fi e r u ni t :commonA t t a c h e d a s s t a nd a r d( O n e pi e c e )Output cable

Length: 2m

TYPE: 47226

Metal BNC-Metal BNC

Output cable

Length: 2m

TYPE: 0311-5200

I n s ul a t e d B N C—Metal BNC,F o r R A c on n e c ti o n

AC power supply cord

Length: 2.5m

For amplifier unit andAS amplifier unit andcase

case: attached as(100VAC)standard (one)TYPE: 0311-5044
AC power supply cord

Length: 3.5m

F or amplif ier uni t

B are wire

( 200 VAC )TYP E : 03 11 - 511 2
DC power supply cord

Red ･･･DC(+)

Length: 2m

For amplifier unit

Black ･･･DC(-)

D - s u b 9 p i n m al e – B a r e

TYPE: AS16-401

Green

wire

･･･ Shield
DC power supply cord

Red ･･･DC(+)

Length: 2.5m

For case

Black ･･･DC(-)

E x t e r n al

TYPE: 47229

Shieldcable: Φ10

di a m e t e r

C o r e wi r e : 1 . 2 5 m m

TABLE 9-1 Cable List (1)
９－３

2

of

N ameShape

Pin alignment

R ema rkJunction cable

A…+BV

Length: 10m

TYPE: 47230

B…- Input

E x t e r n al

C…-BV

cable: Φ9.6

D…+ Input

C o r e wi r e : 0 . 5 m m

di a m e t e rof2

E… Shield
Extension cable

A…+BV

Length: 25m

TYPE: 47231

B…- Input

E x t e r n al

C…-BV

cable: Φ9.6

D…+ Input

C o r e wi r e : 0 . 5 m m

di a m e t e rof2

E… Shield
Synchronization cable①+CAL

Length: 1.8m

B et ween②-CAL

D - S u b 9 pi n m a l e

ne w c ases

③BAL

- - - D - S u b 9 pi n m a l ean d④[OSC]

S t r a ig h t c a bl e

ne w c ases⑤[GND]

TYPE: AS16-402⑥KEYLOCK④ 、 ⑤ ： Non⑦GND

At DC Strain Amplifier

Conection⑧(DC+)( Ca se c onn ect or )⑨(DC-)⑧ , ⑨ : wi ri ng i s m a d e
f o r o nl y a m pl i fi e r un i t

TABLE 9-1 Cable List (2)９－４

9.3 External Dimensions
9.3.1 Amplifier Unit (AS2503)

９－５

9.3.2 Amplifier Unit (AS2603)

９－６

9.3.3 Panel Cut Sizes

９－７

9.3.4 Bench-top CaseN ame

T y peＡ

B

4C H Bench to p c ase

AS 16 -104

262 .6236

6C H Bench to p c ase

AS 16 -105

362 .6336

8C H Bench to p c ase

AS 16 -106

462 .6436

９－８

9.3.5 Rack-mount Case

Rack RailElongate Hole

９－９

9.3.6 Bridge Box (5370 and 5373)

９－１０

To Ensure Prolonged Use
A&D Company,Limited.
Thank you for purchasing an A&D Company,Limited. product.
To ensure prolonged use of the product that you have purchased, we offer the following lineup ofmaintenance services.
1．

Warranty Period
The warranty period for this product is two years from the date of purchase. In case of a failure, theproduct will be repaired free of charge (only if the failure is ascribable to the responsibility of A&D).

2．

Disclaimers
We take no responsibility for any damages caused by the following reasons;(1) Consequential damages and production compensation caused by any accidents of our product;(2) Damages of our product generated by other companies' equipments and their construction;(3) When operation, proper maintenance, and regular inspection are not done;(4) Troubles which are apparently not attributable to our company or those that cannot be decided clearly
whether our company is responsible for those troubles;(5) Exhaustion of consumptions and repair parts;(6) Troubles attributed to third pirty's conflicts;(7) Troubles caused by a force majeure such as natural disasters

Address inquiries to:(1) This manual may not be reproduced to any form in whole or in part.
(2) Then contents in this manual may be updated without prior notice.

AS2503/AS2603
Operation Manual

1WMPD4003356

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