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© National Instruments Corporation 13 SCC-TC Series Thermocouple Input Modules User Guide
where
V
TC
is thermocouple voltage.
V
ESERIES
is E Series DAQ device voltage.
This step provides proper scaling for the thermocouple amplifier in the
SCC-TC0X.
2. Measure the reference-junction (cold-junction) temperature.
a. Read the thermistor voltage [ACH(X+8)].
b. Convert the thermistor voltage to cold-junction temperature using
the formula in the Cold-Junction Sensor Output and Accuracy
section.
3. Calculate the cold-junction compensation voltage by converting the
cold-junction temperature you got in step 2 to a thermocouple voltage.
Use the polynomial expressions applicable to the type of thermocouple
you are using.
4. Apply the cold-junction compensation to the thermocouple reading
by adding the cold-junction compensation voltage you got in step 3
to V
TC
.
5. Calculate the thermocouple temperature by converting the voltage
result you got in step 4 to a temperature. Use the polynomial
expressions applicable to the type of thermocouple you are using.
This calculation gives you a linearized temperature measurement.
Note Polynomials come from NIST Monograph 175.
Specifications
These specifications are typical at 25 °C unless otherwise stated.
Analog Input
Number of input channels...................... 1 DIFF
Input signals...........................................Thermocouples of types B, E, J,
K, N, R, S, and T
Input signal range................................... ±100 mV
Input impedance..................................... 10 MΩ powered on,
10 kΩ powered off or overload
Bandwidth .............................................. 2 Hz