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NI PXI-5663 Calibration Procedure
16. Set the NI 5663 to read the power spectrum using the niRFSA Read Power Spectrum VI or
the
niRFSA_ReadPowerSpectrumF64
function.
17. Get the spectrum information using the niRFSA Get Spectral Info for SMT VI or the
niRFSA_GetSpectralInfoForSMT
function.
18. Perform a peak search using the SMT Spectrum Peak Search VI or the
SmtSpectrumPeakSearch
function. Set the peak threshold to 20 dB below the NI 5663
reference level.
19. Sort the peaks and record the maximum. Save this value as
RFSA Power
.
20. Calculate the
Absolute Accuracy
at each RF frequency using the following formula:
Absolute Accuracy
=
RFSA Power
- (
Channel A Power
+
RF Input Attenuated Calibration Factor
)
RF Input Attenuated Calibration Factor
is the same as that from step 14.
21. Compare the
Absolute Accuracy
to the Verification Test Limits in Table 5.
22. Repeat steps 9 to 21 for all the settings in Tables 3 and 4.
23. Close the NI 5663 session using the niRFSA Close VI or the
niRFSA_close
function.
Reference Levels Greater than or Equal to -30 dBm
1.
Connect the RF source to the power splitter input through the 3.5 mm-to-3.5 mm cable.
2.
Connect the power splitter reference output to power sensor A.
3.
Connect the other power splitter output to the NI 5601 RF IN connector through the 3.5 mm
(m)-to-3.5 mm (m) adapter.
4.
Connect a 50
Ω
terminator to the NI 5601 LO OUT connector. Figure 3 in the preceding
section shows the test limits.
5.
Create a new session for the NI 5663 using the niRFSA Initialize VI or the
niRFSA_init
function.
6.
Perform an internal self-calibration on the NI 5622 using the niRFSA Self Cal VI or the
niRFSA_SelfCal
function.
7.
Lock the NI PXI-5652 to the reference used by the test equipment. Use the niRFSA
Configure Ref Clock VI or the
niRFSA_ConfigureRefClock
function.
8.
Set the NI 5663 to make a spectrum acquisition using the niRFSA Configure Acquisition
Type VI or the
niRFSA_ConfigureAcquisitionType
function.
9.
Set the NI 5663 for a resolution bandwidth according to Table 3 using the niRFSA
Configure Resolution Bandwidth VI or the
niRFSA_ConfigureResolutionBandwidth
function.
10. Set the NI 5663 reference level according to Table 3 using the niRFSA Configure
Reference Level VI or the
niRFSA_ConfigureReferenceLevel
function.
11. Set the NI 5663 center frequency according to Table 4 and span according to Table 3 using
the Center Span instance of the niRFSA Configure Spectrum Frequency VI or the
niRFSA_ConfigureSpectrumFrequencyCenterSpan
function.
12. Commit the settings to hardware using the niRFSA Commit VI or the
niRFSA_Commit
function.