NI PXIe-5611 Calibration Procedure
22
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7.
Call the niRFSG 5611 Adjust LO Filter Calibration VI, and pass the
value measured in step 6 to the
Measured LO OUT Power (dBm)
parameter.
8.
Repeat steps 5 through 7 in a loop until the
LO Filter Calibration
Complete
parameter returns a value of TRUE.
9.
Call the niRFSG Close External Calibration VI to close the session and
store the results to the EEPROM on the NI 5611.
Adjusting LO Path Gain
This adjustment yields accurate power levels reaching both the internal
modulators and the LO OUT connector on the NI 5611. Complete the
following steps to calibrate the LO path gain on the NI 5611 using a power
meter.
1.
Connect the NI 5611 LO OUT front panel connector to the power
meter.
2.
Call the niRFSG Initialize External Calibration VI.
3.
Call the niRFSG 5611 Initialize LO Gain Calibration VI.
Note
The
Filter to Calibrate
parameter on the niRFSG Initialize LO Gain Calibration VI
is by default set to
All Filters
. If you set the
Filter to Calibrate
parameter to another filter
setting, you must repeat steps 3 through 7 for each filter.
4.
Call the niRFSG 5611 Configure LO Gain Calibration VI.
5.
Use the power meter to measure the output power at the frequency
specified by the
Frequency to Measure (Hz)
parameter of the
niRFSG 5611 Configure LO Gain Calibration VI.
6.
Call the niRFSG 5611 Adjust LO Gain Calibration VI, and pass the
value measured in step 5 to the
Measured LO OUT Power (dBm)
parameter.
7.
Repeat steps 4 through 6 until the
LO Gain Calibration Complete
parameter returns a value of TRUE.
8.
Call the niRFSG Close External Calibration VI to close the session and
store the results to the EEPROM on the NI 5611.
