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© National Instruments Corporation 15 SCC-TC Series Thermocouple Input Modules User Guide
Cold-Junction Sensor
Cold-junction sensor accuracy............... ±0.4 °C max from 15 to 35 °C,
±0.75 °C max from 0 to 15 °C
and 35 to 55 °C
Output..................................................... 1.91 V (0 °C) to 0.58 V (55 °C)
Note The accuracy specification includes the combined effects of the temperature sensor
accuracy and the temperature difference between the temperature sensor and any
thermocouple connector. The temperature sensor accuracy includes component tolerances,
temperature drifts, and self-heating effects. It does not include measurement device errors.
Open Thermocouple Detection
Pull-up resistor....................................... 10 MΩ
Bias resistor............................................ 10 MΩ
Maximum field wire gauge.................... 16 AWG
Power Requirement
Analog power......................................... 60 mW max
+15 V .............................................. 2 mA max
–15 V............................................... 2 mA max
Digital power (+5 V).............................. 0.0 mW
K –200 to –100
–100 to 600
600 to 1,200
2.5
1.25
2
1.25
0.67
0.45
N –200 to –100
–100 to 1,300
2.5
2
2
0.7
R –50 to 0
0 to 100
100 to1,600
3
2
1.75
1.24
0.82
0.4
S –50 to 0
0 to 1,400
1,400 to 1,600
3
2
2.5
1.3
1
1
T –200 to –100
–100 to 400
2.5
1
2
0.9
Thermocouple
Type
Temperature
Range (°C)
Maximum
Inaccuracy (±°C)
Typical
Inaccuracy (±°C)