This adjustment calibrates the ALC modulator's gain, linearity, and bias for frequencies >= 3.2 GHz, but < 50 GHz. The ALC modulator is located on the A30 Modulator Filter.
There are several subroutines in this program. These subroutines are used to adjust the gain, linearity, and bias on all analog and vector instruments. Other than terminating the RF output with a 50 ohm load, no other equipment is required. The internal ABUS is used to measure the A10 ALC integrator output voltage.
Gain is adjusted for a 0 V difference at the ALC loop integrator output when switching between two RF power levels. Linearity is adjusted to minimize the difference in voltages at the ALC output between three power levels (high, medium, and low). Bias is adjusted for a 0 V difference at the ALC loop integrator output with the power level set to 0 dBm.
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 |
|
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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 High Band ALC Modulator Calibration
Setup for High 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.