Adjusting Passband Flatness of a Two-Channel PXIe-5423
Follow this procedure to adjust the passband flatness of a two-channel PXIe-5423.
Note
Ensure the power sensor, with the SMA (m)-to-N (f) adapter attached, has
been zeroed within the past hour.
1.
Call niFgen ni5433 Flatness Cal Initialize.
2.
Call niFgen ni5433 Flatness Cal Configure.
3.
Call niFgen ni5433 Flatness Cal Adjust with the following settings:
•
Measured Power (dBm)
: 0 dBm
4.
Connect the power sensor with the SMA (m)-to-N (f) adapter attached to CH 0 of the
PXIe-5423.
5.
Call niFgen ni5433 Flatness Cal Configure to obtain the
Current Configuration
and
Next Configuration
outputs.
6.
Configure the power sensor with the following settings:
•
Auto range
: Enabled
•
Maximum noise ratio
: 0.005 dB
•
Power measurement
: Continuous average
•
Path selection
: Automatic
•
Averaging
: Automatic
•
Aperture
: 20 ms
•
Timeout
: 10 s
•
Frequency
: Frequency returned by the
Current Configuration
output of niFgen
ni5433 Flatness Cal Configure in the previous step
7.
Wait 1 second for settling.
8.
Measure the power of the signal using the power sensor.
9.
Call niFgen ni5433 Flatness Cal Adjust with the following settings:
•
Measured Power (dBm)
: Power of the waveform present on CH 0 of the
PXIe-5423 and measured by the power sensor in the previous step in dBm
10. If the
Next Configuration
output of niFgen ni5433 Flatness Cal Configure obtained in
step 5 returns CH 0, repeat steps 5 through 9. If the
Next Configuration
output of niFgen
ni5433 Flatness Cal Configure obtained in step 5 returns CH 1, continue to step 11.
11. Connect the SMA (m)-to-N (f) adapter and power sensor assembly to CH 1 of the
PXIe-5423.
12. Call niFgen ni5433 Flatness Cal Configure to obtain the
Current Configuration
output.
13. Configure the power sensor with the following settings:
•
Auto range
: Enabled
•
Maximum noise ratio
: 0.005 dB
•
Power measurement
: Continuous average
•
Path selection
: Automatic
•
Averaging
: Automatic
•
Aperture
: 20 ms
PXIe-5423 Calibration Procedure
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© National Instruments Corporation
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