Internal Source Calibration

(E8257D, E8267D, E8663D Option UNT and E8257N Only)

This adjustment calibrates the Log AM Offset, DC Offset, and DC Gain on the A11 Pulse/Analog Modulation Generator.

During this adjustment, ABUS voltages are measured through the rear panel Sweep Out connector.

Log AM Offset Calibration

The FGEN Offset DAC is set to zero, the LF Output voltage is measured, and the results are stored as Offset_a. The FGEN Offset DAC is set to 3000, the LF Output voltage is measured, and the results are stored as Offset_b. The Sensitivity = (Offset_b - Offset_a)/3000 and the result is stored.

DC Offset Calibration

The FGEN Offset DAC is set to zero, the LF Output voltage is measured, and the results are stored as Offset_a. The FGEN Offset DAC is set to 1000, the LF Output voltage is measured, and the results are stored as Offset_b. The Sensitivity = ((Offset_b - Offset_a)/1000) * Offset_a and the result is rounded and stored.

DC Gain Calibration

The FGEN Offset DAC is set to a default value and the LF Output voltage is measured. The results of dividing two by the measured value (cal factor = two/measured value) is stored.

Test Equipment

Preferred Model

Alternate Model(s)

Digital Voltmeter

3458A Opt 002

 

 

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 Internal Source 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.