Measurement Computing DBK Part 2 User Manual
Page 159
DBK Option Cards and Modules
989494
DBK81, DBK82, and DBK83 pg. 9
DBK81, DBK82, DBK83 - Specifications
Name/Function:
DBK81 – 7 Channel High-Accuracy Thermocouple Card
DBK82 – 14 Channel High-Accuracy Thermocouple Card
DBK83 – 14 Channel High-Accuracy Thermocouple Card with external TC/mV
screw-terminal connection pod
System Connector: All DBK options have a DB37 male, which mates with P1 on the DaqBoard, DaqBook,
LogBook, or other DBK options
TC/mV Connector
DBK81: Board-mounted screw terminals
DBK82: Board-mounted screw terminals
DBK83: External pod-mounted screw terminals
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
Input Voltage Range: ±100 mV with a DaqBoard/2000 or LogBook
±50 mV with a DaqBook or DaqBoard
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): ±10 V
Over-Voltage Protection: ±40 V
Power Requirements
DBK81: 35 mA max from ±15V; 2 mA max from +5 V
DBK82 and DBK83: 60 mA max from ±15V; 2 mA max from +5 V
Operating Temperature: 0°C to 50°C
Voltage Accuracy: ±(0.2% of reading +50 µV)
TC Accuracy: See table and accuracy conditions. Valid for one year, 18 to 28°C
Minimum Resolution: 0.1°C for all TC types
TC Accuracy
at Measurement Temperature in °C (±°C)
Type
Min
Max
-100
0
100
300
500
700
900
1100
1400
J
-200 760 0.8
0.7
0.7
0.8
0.9
0.9
— — —
K
-200 1200 0.9
0.8
0.8
0.9
1.1
1.1
1.2
1.3
—
T
-200 400 0.9
0.8
0.8
0.8
— — — — —
E
-270 650 0.8
0.7
0.7
0.7
0.8
— — — —
S
-50 1768 — 3.1
2.4
2.0
2.0
1.9
2.0
2.1
2.1
R
-50 1768 — 3.1
2.1
2.0
1.9
1.9
1.7
1.9
2.0
B
50
1780
— — — 4.9
3.2
2.8
2.4
2.3
2.0
N28
-270 400 1.2
0.9
0.9
0.9
— — — — —
N14
0 1300 — 0.9
0.9
0.9
1.1
1.1
1.2
1.3
—
Accuracy conditions:
•
Data is based on the use of a calibrated DaqBoard/2000
•
The table reflects total system absolute accuracy, including accuracy of the CJC and DaqBoard/2000
•
Excludes possible error from thermocouples
•
Excludes
noise
•
VCM = 0