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NI PXI-5663 Calibration Procedure
12. Commit the settings to hardware using the niRFSA Commit VI or the
niRFSA_Commit
function.
13. Set the RF signal generator to the center frequency in Table 14.
14. Adjust the RF signal generator power to satisfy the following equation:
Channel A Power
+
RF Input Calibration Factor
=
Reference Level
±1 dB
Reference Level
is the value from Table 13. Use the appropriate RF calibration factor for
the channel A sensor. Calculation of the
RF Input Calibration Factor
may require
interpolation.
15. Set the NI 5663 to read the power spectrum using the niRFSA Read Power Spectrum
(Cluster) VI or the
niRFSA_ReadPowerSpectrumF64
function.
16. Get the spectrum information using the niRFSA Get Spectral Info for SMT VI or the
niRFSA_GetSpectralInfoForSMT
function.
17. Capture the peaks using the SMT Spectrum Peak Search VI
or the
SmtSpectrumPeakSearch
function with the following parameter settings:
•
single/multiple (
called
searchCriteria
in the function)
to
Multiple Peaks
•
threshold
to
-150 dBm
18. Sort the spurs using the search span shown in Table 15. The values found are the
Spurious
Sideband Levels
for this span.
19. Calculate the
Spurious Level
using the following formula:
Spurious Level
=
Carrier Level
-
Spurious Sideband Level
Spurious Level
has units of dBc.
Carrier Level
and
Spurious Sideband Level
have units of
dBm.
20. Compare the
Spurious Level
to the test limits in Table 16. Ignore spurs within 1 kHz of the
carrier.
21. Repeat steps 9 to 20 for all settings in Tables 14 and 15.
22. Close the NI 5663 session using the niRFSA Close VI or the
niRFSA_close
function.
If the results are within the selected test limit, the device has passed this portion of the
verification.
Table 16.
Sideband Spurs Verification Test Limits
NI 5663 Tuned Frequency
Test Limit
>1 kHz to
≤
100 kHz
Offset
>100 kHz Offset
10 MHz to <50 MHz
<-60 dBc
<-60 dBc
50 MHz to <3.3 GHz
<-60 dBc
<-60 dBc
3.3 GHz to 6.6 GHz
Not tested
Not tested