National Instruments NI PXIe-5601, Calibration Procedure, Page: 23 / 45

NI PXIe-5601 Calibration Procedure | © National Instruments | 23
8. Set the NI 5601 reference level according to Table 14 using the niRFSA Configure
Reference Level VI or the
niRFSA_ConfigureReferenceLevel
function.
9. Set the NI 5601 center frequency to the RF Input Frequency shown in Table 15 and set the
span according to Table 14 using the Center Span instance of the niRFSA Configure
Spectrum Frequency VI or the
niRFSA_ConfigureSpectrumFrequencyCenterSpan
function.
10. Commit the settings to hardware using the niRFSA Initiate VI or the
niRFSA_Initiate
function.
11. Set the RF source to the RF Input Frequency shown in Table 15.
12. Adjust the RF source power, in dBm, to satisfy the following equation:
Channel A Power + RF Input Calibration Factor = Reference Level ±1 dB
When making the adjustment, use the appropriate RF frequency for the channel A sensor.
Calculation of the
RF Input Calibration Factor may require linear interpolation.
13. Set the spectrum analyzer using the following settings:
• Reference level: 10 dBm
• Frequency span: 1 kHz
• Resolution bandwidth: 1 kHz
• Video bandwidth: 200 Hz
• Number of averages: 10
14. Set the spectrum analyzer center frequency to the IF Output Frequency listed in Table 15.
15. Record the spectrum analyzer peak marker power as Spectrum Analyzer Power at IF Center
Frequency . You do not need to correct this reading for the IF Calibration Factor .
Table 14. NI 5601 Settings (All Frequencies)
NI 5601 Parameter Value
Reference Level 0 dBm
Span 5 MHz
Table 15. Frequencies
RF Input
Frequency
(MHz)
IF Output
Frequency
(MHz)
NI 5601 Center Frequency
Start
(MHz)
Stop
(MHz)
Number of
Points
50 187.5 45 55 21
200 53 190 210 41
1,000 187.5 975 1,025 101