©
National Instruments Corp.
17
NI 9219E Operating Instructions and Specifications
Thermocouple Mode
In Thermocouple mode, the NI 9219E uses the ±125 mV range
of the ADC to return a voltage reading. Use shielded cables and
twisted pair wiring and ground the shielded cables. Each channel
has a built-in thermistor for cold-junction compensation (CJC)
calculations. For improved CJC sensor accuracy, operate the
NI 9219E in a stable temperature environment and avoid placing
heat sources near the module or its connectors. Visit
ni.com/
info
and enter
cjcdatascaling
for more information about
isothermal errors and scaling CJC data. Refer to the
Specifications
section for more information about accuracy. The NI 9219E does
not support open thermocouple detection.
Figure 12.
Connections in Thermocouple Mode
HI
LO
TC
ADC
NI 9219E
+
–
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