DBK81, DBK82, DBK83, & DBK84
Low-Noise, High-Accuracy, Thermocouple/mV Expansion
Features• Measures type J, K, S, T, E, B, R, and N
thermocouples as well as voltage up
to ±100 mV• Low noise, high accuracy, high ­stability• 200 kHz maximum scan rate
• High noise immunity• Open thermocouple detection perchannel• Over-voltage protection• Available in four form-­factors:- 7-channel card with on-board screw
terminals (DBK81)- 14-channel card with on-board
screw terminals (DBK82)- 14-channel card with externalsignal connection “pod” (DBK83)- 14-channel module, housed in a metal
package with mini TC connections(DBK84)
DBK81, DBK82, DBK83, and DBK84 aredesigned to provide very low-noise thermocouple and milli-volt measurements,
with high accuracy and very close tracking
between channels. This series provides TC
accuracy up to 0.8 ˚C, and noise typicallyless than 0.2 ˚C peak-to-peak, with no­digital averaging ­required.

DBK81

The DBK81 provides 7 differential TC or mV inputs, and on-board screw ­terminals
for connection of TC/mV signals directly to the card.

DBK83

The performance of these new DBK cards
is enabled through their use of very
low-noise amplifiers on every channel.
Built-in cold junction compensation andsoftware-based linearization automatically provide quiet and stable temperature measurements, with no need to deal
with the usual complexities associatedwith TC measurements.

CA-239

POD-1

The DBK83 provides 14 differential channels of input (like the DBK82) and includes
an external TC/mV connection pod withscrew terminals. The DBK83 also ­allows
TC connections to reside away from theMeasurement Computing(508) 946-5100

1A/D ­system, reducing the length of thermocouple wire required. The DBK83 makes
it easy to remove all signal connections bydisconnecting one cable from the pod. A
three-foot cable is ­included with the DBK83.

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DBK81, DBK82, DBK83, & DBK84
Specifications & Ordering Information
Specifications

DBK82

Operating Temperature: -30 to +70 ˚CSystem Connector: All DBK options have a DB37 male, which mates with P1*
TC/mV Connector
DBK81: Board-mounted screw terminals
DBK82: Board-mounted screw terminalsDBK83: External pod-mounted screw terminals
DBK84: Mini-TC connectors
Functions: TC types J, K, S, T, E, B, R, N; x100 (voltage)
Inputs
DBK81: 7 differential TC/mV inputs
DBK82: 14 differential TC/mV inputs
DBK83: 14 differential TC/mV inputs
DBK84: 14 differential TC/mV inputs
Input Voltage Range: ±100 mV**
Input Impedance: 40M Ohm (differential); 20M Ohm (single-ended)
Input Bandwidth: 4 Hz
Input Bias Current: 10 nA typ
CMRR: 100dB typ
Maximum Working Voltage (signal + common mode): ±10V
Over-Voltage Protection: ±40V
Power Requirements
DBK81: 35 mA max from ±15V; 2 mA max from +5V
DBK82: 60 mA max from ±15V; 2 mA max from +5V
DBK83: 60 mA max from ±15V; 2 mA max from +5V
DBK84: 60 mA max from ±15V; 2 mA max from +5V
Voltage Accuracy: ±(0.2% of rdg +50 µV)
Temperature Coefficient: 10 ppm for every degree outside the range of 0 to 50 ˚C
TC Accuracy: Valid for one year, 18 to 28 ˚C, see table below
Temperature Coefficient for Type T TC: ±0.03 ˚C per ˚C ambient outside the rangeof 18 to 28 ˚C
Minimum Resolution: 0.1 ˚C for all TC types
Power Consumption
DBK81: 1060 mW;
DBK82, DBK83, DBK84: 1810 mW

The DBK82 provides 14 differential channels of TC or mV inputs,
and is physically taller than the DBK81. The DBK82 installs intoa DBK60, LogBook/360, or DaqLab/2000 Series, where it can bewired directly to the mini-TC ­connector panels (DBK605). Notethat the DBK82 will not install into single-height slots on theDaqBook/2000X, or DBK10. The DBK82 ­consumes two ­expansion
slots in the DBK41 10-slot enclosure.
DBK84

Ordering Information

Description
7-channel TC/mV card with screw-terminal connections
14-channel TC/mV card with screw-terminal connections
14-channel TC/mV card with external screw-terminal Pod
and 3 ft. cable
14-channel TC/mV module with mini TC connector jacks

DBK83
DBK84

Male Connectors for Subminiature TC Jacks

The DBK84 is a 14-channel module with built-in mini-TC ­terminal
jacks. The DBK84 can mechanically attach directly to any moduleor enclosure. The DBK84 is best suited for applications where miniTC jacks are in use, and where quick ­attachment and ­removal ofTCs is desired.

Type Min
J-200
K-200
T-200
E-270
S-50
R-50
B50
N28 -270
N140Part Number
DBK81
DBK82

Type J male connector
Type K male connector
Type T male connector

CN-144-JM
CN-144-KM
CN-144-TM

Accessories & Cables
DBK81, DBK82, and DBK83
For use with DBK10, use CA-37-x ribbon cable; contact factory of additional
cabling options
For use with DBK60 or LogBook/360, no cable is required (except from DBK60 orLogBook/360 to the A/D mainframe)
For use with no enclosure, use CA-37-x, where x is the number of DBK devices attached
For use with DaqLab Series (internal slots), use CA-255-2T with one board, or CA-37-2
for use with two DBK cards; contact factory for additional cabling options
DBK84
Rack mount kit
RackDBK3
Molded T expansion cable; 2 in.
CA-255-2T
Molded T expansion cable; 4 in.
CA-255-4T
Ribbon cable, where x is the number of DBK devices attachedCA-37-x

TC Accuracy at Measurement Temperature in ˚C (±˚C)
Max -1000100 300 500 700 900 1100 1400
760 0.8
0.70.70.80.90.9———1200 0.9
0.8
0.8
0.9
1.1
1.1
1.2
1.3
—
400 0.9
0.8
0.80.8—————650 0.8
0.7
0.7
0.70.8
—
—
—
—
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
—

Note: DBK82 does not install in a DBK10 enclosure. The CA-37-x ribbon cable
can also be used in lieu of the CA-255-x molded T cables.

* Attachment to the DaqBoard/2000 Series requires a DBK200, DBK202, DBK203A,DBK209, DBK213, or DBK214** ±100 mV with a DaqBook/2000 Series, DaqBoard/2000 Series or LogBook

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