DBK9056-Channel Thermocouple Input ModuleFeatures• 56 TC channels in one compact andrugged enclosure• Supports any TC type on any channel• Very low-cost per-channel and very
high-channel density• Attach up to 16 units together for up
to 896 channels per A/D mainframe
The DBK90 Module provides 56 channels of high-accuracy thermocouple (TC)inputs*. The DBK90 is ideally suited forhigh channel count TC applications, witha maximum TC capacity of 896 channels
per system. For larger channel-count applications, multiple mainframes can be
combined for a maximum channel capacityof 3,584 channels.
Thermocouples attach to the DBK90 via
mini-TC input connectors, and any supported TC type can be installed into anychannel. Each row of 14 TC inputs has aseparate cold-junction sensor to insure
accurate readings. DBK90 modules arehoused in a rugged all-metal package thatcan be mounted to the top of a DaqBook,
DaqLab, or can be rack-mounted with an
optional rack-mount kit. When ­multiple
DBK90’s are mounted together, a male andfemale P1 connector on either side of theunit provides all system ­connections sothat only a single cable is required backto the A/D mainframe.

One DBK90 can measure up to 56 thermocouples of any type – up to 896 TC channels canbe attached to one A/D mainframe
For distributed applications**, such as
throughout the cabin of a vehicle, DBK90
modules can be mounted as separate units.
Up to 20 ft. of cable can be used to connect
DBK90 modules.
Each DBK90 has a built-in auto zero­channel and a CJC channel. The DBK90
can measure one TC channel in 3 ms,
14 TC channels in 16 ms, and all 56 TC
channels in 61 ms. A DBK90 based ­systemof 896 channels can be measured in 976
ms. This speed is slower than other DBK­modules to insure that the TC ­measurementsare ­accurate, low-noise, and stable. Typicalmeasurement accuracies are better than 0.7°C,
with ­channel-to-­channel variation typicallyless than 0.5°C. If DBK90 measurements are
mixed with measurements from other DBK
options, the other measurements are madeat their standard 5 or 10 µs/channel rate.

* Operation with a WaveBook requires a WBK40 orWBK41 option attached to the WaveBook/516E.
** The DBK90 is electrically non-isolated. For applications requiring TC connections to high commonmode voltage, use isolation modules with the appropriate DBK carrier module.

P1 maleDBK90 Block Diagram
Thermocouple VINOpen TC
detection

56 Channels Total(Ch0 thru CH55)
High (+)

CH0-–VB+V
Instrumentation
amplifier(to A/Dmainframe)–V
Address switch

Filterprecharge

1++Low (-)
CHs 1 thru 55
via mini-TC
connectors

MUX(+)

IA-

0 8 4 2 1++-(-)

MUX+VB-4CJC1CJC2CJC3CJC4P1 female(to other DBKmodules)

Cold junctionsensors

DEMUX

Channel select lines

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DBK90Specifications & Ordering Information
Specifications

Ordering Information

System Compatibility: Attaches to DaqBook/2000 Series, DaqLab/2000 Series,
DaqScan/2000 Series, or WaveBook/618E via WBK40 or WBK41
System Connector: Male and female DB37 for unit-to-unit mating and matingwith P1 on the acquisition mainframe
TC Connector: Mini-TC connectors
ACOM Connector Type: Pomona model 5936-0Inputs: 56 differential TC inputs, open TC detection per channel
TC Types: J, K, T, E, S, R, B, N28, N14
Speed: 1 channel in 3 ms, 14 channels in 16 ms, 56 channels in 6ms(see sample rate insert for calculating total system sample rates)
Dimensions: 285 mm W x 88 mm D x 52 mm H
(11” x 3.44” x 2.05”)
Weight: 0.96 kg (2.12 lbs)
Power Requirements: 40 mA max from ±15V; 60 mA max from +5V
Input Impedance: 4M Ohm (differential) in parallel with 400pF; non-isolated

Description56-channel thermocouple input module

Accessories & Cables
Mounting kit for mounting one DBK90 to another DBK90
Rack-mount kit for rack mounting one DBK90
Mounting kit for attaching 1 or 2 DBK90 modules on top of aDaqBook which has no protective ears
Mounting kit for attaching 1, 2, or 3 DBK90 modules on topof a DBK60 which has no protective ears
Molded corner mounting kit for attaching 1 or 2 DBK90 modules
on top of a DaqBook which has protective ears
Shielded ribbon cable recommended for scenariosin which signal noise is a problem; 7 inShielded ribbon cable recommended for scenarios
in which signal noise is a problem; 18 in
Molded T expansion cable; 2 in.
Molded T expansion cable; 4 in.
Ribbon cable, where x is the number of DBK devices attached

DBK90 Maximum Channel Capacity
Mainframe
Product Family

Max. Ch. Capacity Max. Ch. Capacity Max. DBK90 Power
Capacity per Mainframe†
per Mainframe
per System

DaqBook/2000 Series 896 (16 DBK90s)

3,584* (64 DBK90s)

6 DBK90s

WaveBook/WBK40/41 854 (15 DBK90s) 2,562** (45 DBK90s)

10 DBK90s

Part No.
DBK901109-0800
1109-08011109-0802
1109-0803
1109-0804
CA-143-7
CA-143-18
CA-255-2T
CA-255-4T
CA-37-x

Note: The CA-37-x ribbon cable can also be used in lieu of the CA-255-x
molded T cables.

* Presumes 4 DaqBook mainframes per system** Presumes 3 WBK40/41 mainframes attached to one WaveBook/516E†Presumes no other active DBK modules are attached. A DBK32A power supply is necessary
to power additional DBK90s or other active DBK options.

Input Bandwidth: 1 kHz
Minimum Resolution: 0.1 ˚C for all TC types
TC Accuracy††: Valid for one year at 25 ˚C ambient, see table below
Operating Temperature: -30 to +70 ˚C
Relative Humidity: 0 to 95% non-condensing
Temperature Coefficient of Accuracy for Type T TC:  ±0.05 ˚C for every ˚C awayfrom 25 ˚C
Channel-to-Channel Crosstalk: -90 dB typ (0 to 100 Hz)
DC CMRR: -80 dB typ
AC CMRR: -80 dB typ (0 to 60 Hz)
Maximum Common Mode Voltage: ±10V
Over-Voltage Protection: ±40V
Type Min
J-200
K-200
T-200
E-270
S-50R-50B50
N28 -270
N140TC Accuracy at Measurement Temperature in ˚C (±˚C)
Max -1000
100 300 500 700 900 1100 1400
760 0.8
0.7
0.7
0.8
0.9
0.9
—
—
—
1200 0.9
0.8
0.8
0.9
1.1
1.1
1.2
1.3
—
400 0.9
0.8
0.8
0.8
—
—
—
—
—
650 0.8
0.7
0.7
0.7
0.8
—
—
—
—
1768
—
3.1
2.4
2.0
2.0
1.9
2.0
2.1
2.1
1768
—
3.1
2.1
2.0
1.9
1.9
1.7
1.9
2.0
1780
—
—
—
4.9
3.2
2.8
2.4
2.3
2.0
400 1.2
0.9
0.9
0.9
—
—
—
—
—
1300
—
0.9
0.9
0.9
1.1
1.1
1.2
1.3—

Two DBK90s (112 TC channels) mounted on a DaqBook/2020

One DBK90 (56 TC channels)
with rack-mount option†† Accuracy conditions:- Exclusive of thermocouple errors- Exclusive of noise- VCM=0- 25 ˚C ambient temperature, stabilized for 1 hour

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