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6.
Calculate the phase for each channel on the NI 9225. NI recommends using the Extract
Single Tone Information VI to calculate phase.
7.
Compare the channel-to-channel phase difference to the limits in Table 11.
8.
Repeat steps 2 through 7 for each test point in Table 11.
Table 11. NI 9225 Verification Test Limits for Phase Matching
Generator Frequency (kHz)
1
20
9.
Disable the function generator.
10. Disconnect the function generator from the device.
If the Phase Matching verification procedure determines that the NI 9225 is outside of the limits,
refer to
Where to Go for Support
Adjustment
The following performance adjustment procedure describes the sequence of operation required
to adjust the NI 9225.
Accuracy Adjustment
Complete the following procedure to adjust the accuracy performance of the NI 9225.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9225 to the calibrator as shown in Figure 1.
3.
Adjust the NI 9225.
a.
Initialize a calibration session on the NI 9225. The default password is
b.
Input the external temperature in degrees Celsius.
c.
Call the NI 9225 get C Series adjustment points function to obtain an array of
recommended calibration voltages for the NI 9225.
d.
Set the calibrator to a reference value determined by the array of recommended
calibration voltages.
e.
Set the calibrator to Operate mode (OPR).
f.
Call and configure the NI 9225 adjustment function according to Table 12.
Physical Channel
cDAQMod8/aix
g.
Set the calibrator to Standby mode (STBY).
Phase Matching Channel-to-Channel Limit
for assistance in returning the device to NI.
Table 12. Adjustment Configuration
The actual value of the voltage output of the calibrator
NI 9225 Calibration Procedure | © National Instruments | 9
±0.035°
±0.700°
Reference Value
.
NI
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