NI PXIe-5601 Calibration Procedure
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© National Instruments
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9.
Commit the settings to hardware using the niRFSA Initiate VI or the
niRFSA_Initiate
function.
10. Set the RF source to the same frequency you used for the NI 5601 center frequency
according to Table 12.
11. At each NI 5601 center frequency, perform the following steps:
a.
Adjust the RF source power, in dBm, to satisfy the following equation:
Channel A Power
+
RF Input Calibration Factor
= 0 dBm ±0.5 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.
b.
Wait at least 200 ms.
c.
Measure and record the channel B power. This value is the
LO Output Power
. Use the
appropriate RF frequency from Table 12 for the channel B sensor.
12. Compare the
LO Output Power
to the test limit in Table 13.
13. Repeat steps 8 to 12 for all frequencies in Table 12.
Note
NI recommends keeping your RF signal generator enabled when repeating
steps unless making a connection change. Keeping the signal generator enabled
reduces the wear on the RF signal generator relays. After making a connection
change and enabling your generator, wait 5 seconds for the system to settle.
14. Close the NI 5601 session using the niRFSA Close VI or the
niRFSA_close
function.
Instantaneous Bandwidth Verification
1.
Connect the NI 5601 IF OUT connector to the spectrum analyzer input through the
3.5 mm-to-3.5 mm cable.
2.
Connect the RF source to the power splitter input through the 3.5 mm-to-3.5 mm cable.
3.
Connect the power splitter reference output to power sensor A.
4.
Ensure that the 50
Ω
terminator is connected to the NI 5601 LO OUT connector.
Table 13.
LO Output Verification Test Limits
Frequency
As-Found or As-Left Limit
110 MHz to 6.6 GHz
0 dBm ±3.5 dB (nominal)
Note
: LO Input Power = 0 dBm ±0.5 dB.
