National Instruments PXI-5650, Процедура калибровки

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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.