ALC Mod Bias DAC Sensitivity Calibration

(E8267D Only)

This adjustment calibrates the sensitivity in DAC counts/dB of power change with regard to the ALC.

The calibration is performed in both highband and lowband with a DAC value being stored for each band. The signal generator power is set +5 dB above the attenuator trip point, the ALC loop is then opened up and a power search routine is executed. The signal generators output power is monitored with a power meter while the DAC is changed until a difference of 5 dB has been achieved. The difference between the initial DAC value and the final DAC value divided by the power delta (+5 dB) are stored in the module.

Test Equipment

Preferred Model

Alternate Model(s)

Power Meter

N1914A1

E4419B
E4419A

Power Sensor

N8487A

8487A Opt H842
N8485A3
N8485A CFT3
8485A Opt H842,3
E9300A Opt H253

Function Generator

33250A

33120A Option 001
  1. Power meter N1914A with serial numbers ranging between MY00000000—MY53040007 require Service Note 07 to be applied for measurement repeatability. Please have this service note applied or verify it was applied before using this power meter. The affected service note is: N1914A-07 Service Note
  2. Option H84 provides reflection coefficient data.
  3. Only allowed for the following product configurations:
          E8257D with Option 520.
          E8267D with Option 520.

Connections and Setup Procedures

  • All test equipment requires a 30 minute warmup period to ensure accurate performance.

  • In the following test setup, cables are designated as solid lines and direct connections are designated as dashed lines.

  1. Connect all test equipment as shown.

  2. Connect GPIB cables to all GPIB-controlled test equipment.

  3. While performing this adjustment, follow all instructions on the controller display.

 

Setup for Power Meter Calibration

 

Setup for Mod Bias DAC Sensitivity Calibration

In Case of Difficulty

If this adjustment fails, perform the following steps in order:

  1. Check the equipment setup (see above). If the setup is incorrect, make the necessary corrections and rerun the adjustment.

  2. 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.

  3. If you cannot correct the problem using the troubleshooting procedures in the Service Guide, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.