TB-9212 Calibration Procedure
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© National Instruments
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7
7.
Acquire and average a CJC
temp
x
value.
a.
Create and configure an AI Temp Built-in Sensor task for CJC channel _cjtemp
x
on
the NI 9212 according to Table 2.
b.
Configure the AI Temp Built-in Sensor task for CJC channel _cjtemp
x
according to
Table 3.
c.
Start the task.
d.
Average the readings and record the value as CJC
temp
x
.
e.
Clear the task.
8.
Set the thermocouple calibrator output to CJC
temp0
to obtain the readings for the first four
physical channels, ai0:3. This ensures that during the thermocouple measurements, the
input channel measures very close to 0 V, which eliminates gain errors in the NI 9212.
9.
Acquire and average samples.
a.
Create and configure an AI temperature thermocouple channel for the NI 9212
according to Table 4.
b.
Configure the AI temperature thermocouple channel timing according to Table 5.
c.
Start the task.
Table 2.
NI 9212 CJC Channel Configuration
Physical Channels
Timing Mode
_cjtemp0:1
High Resolution
Table 3.
NI 9212 CJC Channel Timing Configuration
Sample Mode
Samples Per Channel
Rate (S/s)
Timeout (s)
Finite
20
1.8
30
Table 4.
NI 9212 Thermocouple Channel Configuration
CJC
Channel
Physical
Channels
Minimum
Value
Maximum
Value
Unit
Thermocouple
Type
CJC
temp0
ai0:3
0
100
°C
E
CJC
temp1
ai4:7
0
100
°C
E
Table 5.
NI 9212 Thermocouple Channel Timing Configuration
Timing
Mode
Sample
Mode
Samples Per
Channel
Rate (S/s)
Timeout (s)
High Resolution
Finite
20
1.8
30
