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NI 9212 Calibration Procedure
Verification
The following performance verification procedures describe the sequence of operation and test
points required to verify the NI 9212. The verification procedures assume that adequate
traceable uncertainties are available for the calibration references.
Voltage Verification
Complete the following procedure to determine the As-Found status of the NI 9212.
1.
Loosen the captive screws and remove the top cover from the NI CAL-9212.
2.
Connect the calibrator to the NI CAL-9212, as shown in Figure 3.
Figure 3.
Voltage Channel Verification Connections
3.
Reinstall the top cover on the NI CAL-9212.
4.
Connect the NI CAL-9212 to the NI 9212, as shown in Figure 2.
5.
On the Fluke 5522A calibrator, lock the voltage range to 3.3 V to reduce loading error.
a.
Set the output voltage to 2.0 V.
b.
Press the
3.3 V auto
button to lock the 3.3 V range.
6.
Set the calibrator output to a Test Point value indicated in Table 4.
7.
Set the calibrator to Operate mode (OPR).
8.
Acquire and average samples.
a.
Create and configure an AI voltage channel on the NI 9212 according to Table 2.
Table 2.
NI 9212 Voltage Channel Configuration
Physical Channels
Input Range (mV)
Scaled
Units
Terminal
Configuration
Min
Max
cDAQ1Mod8/ai0:7
-78.125
78.125
Volts
Differential
C
a
li
b
r
a
tor
NI CAL-9212
TC –
LO
GROUND LUG
TC +
HI
