The Lowband ALC Modulator Calibration adjusts 2 DACs so the ALC off level accuracy is satisfactory. In general the BIAS DAC (LB OFFSET) compensates for the frequency response of the RF path, while the GAIN DAC (LB BIAS) sets the slope of the modulator.
Test Equipment |
Preferred Model |
Alternate Model(s) |
Function Generator |
33250A |
33120A Opt 001 |
50 Ohm Terminator |
Depending on the DUT RF Output Connector, choose: 85138B (2.4mm)
|
20 dB attenuator |
|
|
Connect all test equipment as shown.
Connect GPIB cables to all GPIB-controlled test equipment.
While performing this adjustment, follow all instructions on the controller display.
Setup for Low Band ALC Modulator Calibration
Setup for Low Band ALC Modulator Calibration (E8267D with Option H16, 016, HBQ, or HBR)
If this adjustment fails, perform the following steps in order:
Check the equipment setup (see above). If the setup is incorrect, make the necessary corrections and rerun the adjustment.
If this adjustment fails with the equipment set up properly, refer to the troubleshooting section of the signal generator's service guide. If you do not have a printed copy of the service guide (Option OBW), one is available either on the CD-ROM that came with your signal generator shipment or on the Keysight Website.
If you cannot correct the problem using the troubleshooting procedures in the Service Guide, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.