DBK52

14-Channel Thermocouple Input ModuleOverview …… 1
Hardware Setup …… 2
Module Connection …… 2
Module Configuration …… 3
DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration …… 3
DaqBook/2000 Series and DaqBoard/2000 Series Configuration …… 3

Software Setup …… 4
DBK52 – Specifications …… 4
Reference Notes:
o Chapter 2 includes pinouts for P1, P2, P3, and P4. Refer to pinouts applicable toyour system, as needed.
o In regard to calculating system power requirements, refer to DBK Basics locatednear the front of this manual.

Overview
DaqView Users: When DBK52 is used with /2000 Series Devices, the Internal Clock Speedshould be set to 100 kHz as described in Chapter 3, DBK Setup in DaqView.

The DBK52 provides the ability to scan and input thermocouple data for various computer-based
temperature-monitoring systems. Features include:•Each DBK52 can connect up to 14 thermocouples. Up to 16 DBK52s may attach to a single
LogBook or Daq Device to measure a maximum of 224 (16 × 14) temperatures.

•Standard, miniature jacks can connect to all T/C types.

•Onboard cold junction sensor (CJS) circuitry is accessible via a built-in channel to the system.

•

A built-in short-to-ground channel back to the system eliminates offset errors via software.

•

RC low-pass input filters reject high frequency noise for thermocouple shields.

•

An external analog-common access jack provides a bias-current return path for differential
signal inputs.

•

An onboard programmable gain amplifier supports most thermocouple types and temperature
ranges.

•Software-based linearization (in LogView and DaqView) converts analog signals into
temperature values.
Reference Note:
In regard to Daq devices, related material for programmers is included in the separate
Programmer’s Manual (p/n 1008-0901).
The following table shows the temperature range for each thermocouple type.
T/C Type
Temperature
Range °C
Temperature
Range °F

J-200 to760
-328 to1400

K-200 to1260
-328 to2300

T-200 to400-328 to752

E-270 to1000
-454 to1832

N28-270 to400-454 to752

N140 to
1300
32 to2372

S0 to
1780
32 to3236

R0 to1780
32 to3236

B0 to1820
32 to3308

Thermocouple accuracy depends on the thermocouple itself, the cold-junction sensor, A/D conversion, andlinearization. The DBK52, LogBook, and Daq device systems use quality components and software
compensation to minimize error from these sources. Systems achieve a ±1°C CJS accuracy that contributes
to the overall accuracy. When the software is calibrated, gain and offset errors are virtually eliminated.
The DBK52’s built-in auto-zero channel dynamically eliminates any other system offset-errors.
DBK Option Cards and Modules

989594

DBK52, pg. 1

True differential measurements of T/Cs require bias-current referenced to the analog common. Resistors
from each input T/C are connected to the analog common. Filter capacitors across each input operate with
input protection resistors to form a single-pole RC low-pass filter.

Hardware Setup
Module Connection
The DBK52 has miniature T/C jacks to connect different types of thermocouples and an analog-ground
access point. Connections are provided for 14 thermocouples. Thermocouple polarities must beobserved. Thermocouple types J, K, T, E, N28, N14, S, R and B are supported by the LogView orDaqView software and may be connected to DBK52 board channels CH2 through CH15.
T/CTypeJK
T
E
N28
N14S
R
B

Note:

(+) Lead toChannel-Hi
White
YellowBlue
VioletOrangeOrangeBlack
Black
Gray

(-) Lead toChannel-Lo
Red
Red
Red
Red
Red
Red
Red
Red
Red

CH0 is reserved for the cold-junction compensation sensor (factory installed).
CH1 is permanently shorted to allow software-driven auto-zero to compensate fortemperature drift.

Thermocouple wire is standardized and color-coded as shown in the table. T/Cs have a very small output.
Long T/C leads can pickup lots of noise. Use shielding as needed, and average several readings insoftware to minimize noise effects.
After all connections are in place, secure wires to captive areas (pre-drilled holes) at the rear edge of theboard. Nylon tie wraps (not included) work well for this purpose.

DBK52, pg. 2989594

DBK Option Cards and Modules

Module Configuration
Up to 16 DBK52s may be connected to a LogBook or a Daq Device. As a daisy-chaininterface, each module must appear unique. Each module uses a different analog input
channel. To configure the module:
1.

Assign a channel number to the module. The assigned number mustnot be used by any other DBK card or module.

2.

Locate the 16×2-pin header near the front of the board labeled JP1, andplace the jumper on the LogBook or Daq Device channel you wish touse. There are 16 jumper locations on this header labeled CH0 throughCH15. Only one jumper setting is used on a single module; no othermodule in a common daisy-chain can use the same jumper setting.

DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration
Three setup steps and needed to configure DaqBooks/100 Series & /200 Series devices andDaqBoards [ISA type] for a DBK52.
1.

If not using auxiliary power, place the JP1 jumper in the Analog Option Card Use (expandedanalog) mode.

Note:
These jumpers do not
apply to /2000 Seriesdevices.

To power the interface circuitry of the DBK52 via the internal ±15 VDC power supply,
JP1 must be set to “Analog Option Card Use.” However, if using auxiliary power, e.g.,
the DBK32A or the DBK33, you must remove both JP1 jumpers. Refer toPower Requirements in the DBK Basics section and to the DBK32A and DBK33
sections for additional information, as applicable.
2.

For DaqBook/100, DaqBook/112 and DaqBook/120 only, place the JP3 jumper inbipolar mode.

3.

For DaqBook/100, DaqBook/112 and DaqBook/120 only, place the JP4 jumper insingle-ended mode.

Note: The DaqBook/200 Series devices and DaqBoards do not have a JP4. The single-ended or differential
choice is made via software configuration commands.

DaqBook/2000 Series and DaqBoard/2000 Series Configuration
No jumper configurations are required for the /2000 series devices.

DBK Option Cards and Modules

989594

DBK52, pg. 3

Software Setup
Reference Notes:
o DaqView users - Refer to Chapter 3, DBK Setup in DaqView.
o LogView users - Refer to Chapter 4, DBK Setup in LogView.
o DBK52 Calibration Disk – Each DBK52 card is shipped with a calibration disk with constants
used to correct gain and offset errors inherent in the hardware. This calibration is done
automatically by DaqView and LogView. Refer to the readme.txt file on the disk.
DaqView Users: When DBK52 is used with /2000 Series Devices, the Internal Clock Speed should be
set to 100 kHz as described in Chapter 4, DBK Setup in DaqView.

The DBK52 selection allows the user to define the thermocouple types by using the Type column of theanalog input spreadsheet.
Each DBK52 card is shipped with a calibration disk with constants used to correct gain and offset errors
inherent in the hardware. This gain and offset calibration is done automatically by DaqView andLogView. See the DBK52 readme.txt file on the disk shipped with the board for details on creating thisfile.

DBK52 - Specifications
Name/Function: Thermocouple Input Module

Input Impedance: 20 kΩ

Connectors:
DB37 male, mates with P1.
Thermocouples attach directly to on-board jacks.

Input RC Filter -3 dB Frequency: 15.9 kHz

Thermocouple Types: J, K, S, T, E, B, R, N
Gain Ranges: ×60, ×90, ×180, ×240
Inputs:14 differential thermocouples
1 cold-junction compensation
1 auto zero

Gain Accuracy:
Uncalibrated: 0.15%
Calibrated: 0.02%
Maximum Input Voltage: 35 VDC
CMRR (Input Stage): 110 dB type DC to 60 Hz
Offset: Software compensated
Type/Range/Accuracy/Resolution: refer to thefollowing table

Cold Junction Sensor Output: 100 mV/°C
Voltage Ranges/Gains:
0 to 80 mV ×60
0 to 50 mV ×90
0 to 25 mV ×180
0 to 20 mV ×240
0 to ±10 mVDC

Thermocouple Reference
Range

Resolution

J-200°C

760°C

0.6°C

0.6°C

12-bit
<0°C
1.2°C

K

-200°C

1260°C

1.6°C

1.0°C

1.1°C

0.8°C

0.1°C

T-200°C

400°C

1.4°C

0.8°C

0.8°C

0.3°C

0.1°C

0.1°C

E

-270°C

1000°C

1.4°C

0.9°C

1.6°C

0.7°C

0.1°C

0.1°C

N28

-270°C

400°C

0.8°C

0.8°C

1.0°C

1.0°C

0.1°C

0.1°C

N140°C

1300°C

—

1.0°C

—

5.0°C

—

5.0°C

S

0°C

1780°C

—

1.6°C

—

1.3°C

—

0.1°C

R

0°C

1780°C

—

1.6°C

—

1.7°C

—

0.1°C

B

0°C

1820°C

—

1.8°C

—

1.5°C

—

0.1°C

Type

DBK52, pg. 4

Accuracy

Min

Max(<0°C)

989594(>0°C)

12-bit>0°C
0.5°C

16-bit<0°C
0.1°C

16-bit
>0°C
0.1°C
0.1°C

DBK Option Cards and Modules