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OMB-DAQ-TC-RACK User's Guide
Specifications
21
Accuracy
Thermocouple measurement accuracy
Table 4. Thermocouple accuracy specifications, including CJC measurement error. All specifications are (±).
Sensor
Type
Sensor
Temperature
(°C)
Accuracy Error
Maximum (°C),
15°C to 35°C
Accuracy Error
Typical (°C),
15°C to 35°C
Accuracy Error
Maximum (°C),
0°C to 45°C
Accuracy Error
Typical (°C),
0°C to 45°C
J
–210
1.965
0.910
2.167
0.989
0
0.787
0.361
0.816
0.375
1200
0.752
0.371
1.148
0.508
K
–210
2.295
1.061
2.520
1.152
0
0.821
0.376
0.852
0.392
1372
1.029
0.504
1.560
0.688
S
–50
2.467
1.111
2.655
1.223
250
1.835
0.825
1.961
0.904
1768
0.893
0.361
1.519
0.590
R
–50
2.609
1.174
2.810
1.293
250
1.862
0.837
1.992
0.918
1768
0.754
0.305
1.346
0.520
B
250
2.450
1.090
2.707
1.254
700
0.937
0.424
1.136
0.520
1820
0.610
0.300
1.056
0.467
E
–200
1.754
0.811
1.933
0.880
0
0.775
0.355
0.806
0.369
1000
0.657
0.323
0.989
0.437
T
–200
2.005
0.923
2.207
1.005
0
0.836
0.382
0.874
0.400
400
0.544
0.255
0.659
0.297
N
–200
2.255
1.038
2.481
1.134
0
0.908
0.415
0.949
0.437
1300
0.718
0.357
1.157
0.510
Thermocouple measurement accuracy specifications include polynomial linearization, cold-junction
compensation, and system noise. The accuracy specifications assume the device is operated within its enclosure
and with the enclosure in a horizontal, upright orientation. The board should also be warmed up for the
recommended 20 minutes. If the maximum digital output load of 3.2 amps is applied, add an additional 0.30°C
to the typical and maximum accuracy specifications listed above. Errors shown do not include inherent
thermocouple error. Contact your thermocouple supplier for details on the actual thermocouple accuracy error.