NI 9229/9239 Calibration Procedure
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© National Instruments
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9
6.
Compare the channel-to-channel phase difference to the limits in Table 12.
7.
Repeat steps 2 through 6 for each test point in Table 12.
If the Phase Matching verification procedure determines that the NI 9229/9239 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 describes the sequence of operation required
to adjust the NI 9229/9239.
Accuracy Adjustment
Complete the following procedure to adjust the accuracy performance of the NI 9229/9239.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9229/9239 to the calibrator as shown in Figure 1.
Note
If the calibrator outputs are truly floating, the negative output must be
connected to a quiet earth ground as well as AI- to give the entire system a ground
reference.
3.
Adjust the NI 9229/9239.
a.
Initialize a calibration session on the NI 9229/9239. The default password is
NI
.
b.
Input the external temperature in degrees Celsius.
c.
Call the NI 9229/9239 get C Series adjustment points function to obtain an array of
recommended calibration voltages for the NI 9229/9239.
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 9229/9239 adjustment function according to Table 13.
Table 12.
NI 9229/9239 Verification Test Limits for Phase Matching
Module
Generator Frequency
(kHz)
Phase Matching Channel-to-Channel Limit
NI 9229
1
±0.045°
20
±0.900°
NI 9239
1
±0.075°
20
±1.500°
