NI 9212 Calibration Procedure
|
© National Instruments
|
13
10. Reinstall the top cover on the NI CAL-9212.
11. Connect the NI CAL-9212 to the NI 9212, as shown in Figure 2.
12. Initialize a calibration session on the NI 9212. The default password is
NI
.
Note
You only need to initialize the calibration session once.
13. Adjust the NI 9212 CJC.
a.
Input the external temperature in degrees Celsius using the set temperature C Series
function.
b.
Call the Get NI 9212 Calibration Adjustment Points function and set the physical
channel according to Table 10 to obtain an array of recommended calibration voltages
for a CJC channel of the NI 9212.
c.
On the Fluke 5522A calibrator, lock the voltage range to 3.3 V to reduce loading error.
d.
On the digital multimeter, set the range to the appropriate range according to a
reference value determined by the array of adjustment points.
e.
Set the calibrator to a reference value determined by the array of adjustment points.
f.
Set the calibrator to Operate mode (OPR).
g.
Wait at least 15 seconds for the NI 9212 to settle before proceeding to the next step.
h.
Take five digital multimeter readings.
i.
Average the digital multimeter readings.
j.
Perform the following calculations to obtain the CJC Cal Value.
k.
Call and configure the Adjust NI 9212 Calibration function according to Table 10.
l.
Set the calibrator to Standby mode (STBY).
m. Repeat steps d through m for each calibration voltage in the array.
14. Remove the NI CAL-9212 from the NI 9212.
15. Loosen the captive screws and remove the top cover from the NI CAL-9212.
16. Disconnect the calibrator and digital multimeter from the NI CAL-9212.
17. Repeat steps 2 through 11, then steps 13 c through 16 for the other CJC channel on the
NI 9212.
18. Close the calibration session.
Table 10.
Voltage Adjustment Configuration
Physical Channel
Reference Value
cDAQ1Mod8/_cjtemp
x
CJC Cal Value
CJC Cal Value
Averaged digital multimeter reading Adjustment coefficient
=
