NI 9227 Calibration Procedure
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© National Instruments
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9
d.
Read samples from the NI 9227. Record this measurement for each channel.
e.
Clear the task.
6.
Calculate the phase for each channel on the NI 9227. 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.
9.
Disable the function generator.
10. Disconnect the function generator from the device.
If the Phase Matching verification procedure determines that the NI 9227 is outside of the limits,
refer to
Worldwide Support and Services
for assistance in returning the device to NI.
Adjustment
The following performance adjustment procedure describe
s
the sequence of operation required
to adjust the NI 9227.
Accuracy
Adjustment
Complete the following procedure to adjust the accuracy performance of the NI 9227.
Note
Completing the Accuracy adjustment procedure adjusts the NI 9227 to meet
both the 5 A
rms
and 10 A
rms
accuracy specifications listed in the
NI 9227 Operating
Instructions and Specifications
.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9227 to the calibrator as shown in Figure 1.
3.
Adjust the NI 9227.
a.
Initialize a calibration session on the NI 9227. The default password is
NI
.
b.
Input the external temperature in degrees Celsius.
c.
Call the NI 9227 get C Series adjustment points function to obtain an array of
recommended calibration currents for the NI 9227.
d.
Set the calibrator to a reference value determined by the array of recommended
calibration currents.
Table 11.
NI 9227 Verification Test Limits for Phase Matching
Generator Frequency (kHz)
Phase Matching Channel-to-Channel Limit
1
±0.100°
20
±2.000°
