28 | ni.com | NI PXI-5650/5651/5652 Calibration Procedure
14. Repeat steps 11 through 13 until the ALC calibration complete parameter of the
niRFSG 5652 Adjust ALC Calibration VI returns a value of TRUE.
15. Call the niRFSG Close External Calibration VI to close the session. Set the write
calibration to hardware? parameter to TRUE to store the results to the EEPROM on the
PXI-5650/5651/5652.
Adjusting Attenuators
This procedure measures the frequency response of the attenuator circuit. This response is used
to generate accurate power levels at the PXI-5650/5651/5652 RF OUT front panel connector.
Complete the following steps to adjust the PXI-5650/5651/5652 attenuators using a power meter
and spectrum analyzer:
1. Connect the PXI-5650/5651/5652 RF OUT front panel connector to the power meter
thermal sensor.
2. Disconnect the PXI-5650/5651/5652 REF IN/OUT front panel connector from any clock
source, if connected.
3. Connect any available rubidium frequency reference rear panel BNC connector to the
spectrum analyzer REF IN rear panel connector.
4. Connect any available rubidium frequency reference rear panel BNC connector to the
10 MHz REF IN connector on the back of the PXI chassis.
5. Call the niRFSG Initialize External Calibration VI.
6. Call the niRFSG 5652 Initialize Attenuator Calibration VI, and set the measurement
range parameter to Above -40 dBm (Below 10 MHz).
7. Call the niRFSG 5652 Configure Attenuator Calibration VI.
8. Use the power meter to measure the RF OUT power at the frequency specified by the
frequency to measure parameter of the niRFSG 5652 Configure Attenuator
Calibration VI.
9. Call the niRFSG 5652 Adjust Attenuator Calibration VI, and wire the measured value from
step 8 to the measured RF OUT power parameter.
10. Repeat steps 7 through 9 until the attenuator calibration complete parameter of the
niRFSG 5652 Adjust Attenuator Calibration VI returns a value of TRUE.
11. Connect the PXI-5650/5651/5652 RF OUT front panel connector to the power meter
thermal sensor.
12. Call the niRFSG 5652 Initialize Attenuator Calibration VI, and set the measurement
range parameter to Above -40 dBm (Above 10 MHz).
13. Call the niRFSG 5652 Configure Attenuator Calibration VI.
14. Use the power meter to measure the RF OUT power at the frequency specified by the
frequency to measure parameter of the niRFSG 5652 Configure Attenuator
Calibration VI.
15. Call the niRFSG 5652 Adjust Attenuator Calibration VI, and wire the measured value from
step 14 to the measured RF OUT power parameter.
16. Repeat steps 13 through 15 until the attenuator calibration complete parameter of the
niRFSG 5652 Adjust Attenuator Calibration VI returns a value of TRUE.
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