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Figure 2-16.  Temperature Measurement Wiring Diagram

The SCXI-1331 contains a cold-junction temperature sensor (CJS). This 
sensor is a special channel on the SCXI-1127/1128 dedicated to measuring 
the ambient temperature of the terminal block. This channel is always 
scanned as a 2-wire channel. Including a CJS channel in the scan list is 
optional. You can include a CJS channel at any position in the list with any 
number of repetitions.

The SCXI-1331 temperature sensor outputs 0.2–0.024 V from 0–50 °C and 
has an accuracy of ±0.5 °C over the 15–35 °C range and ±0.9 °C over the 
0–15 °C and 35–50 °C ranges.

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National Instruments software can convert a thermistor voltage to the 
thermistor temperature. In LabVIEW, you can use the Convert Thermistor 
Reading virtual instrument (VI) in the Data Acquisition»
Signal Conditioning palette. If you are using Measurement Studio or 

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Includes the combined effects of the temperature sensor accuracy and the temperature difference between the temperature 
sensor and any screw terminal. The temperature sensor accuracy includes tolerances in all component values, the effects 
caused by temperature and loading, and self-heating.

SCXI-1127/1128

R

1

-

Iex

RTD

Thermistor

R

2

V

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Thermocouple