Timebase Calibration

(Non Option UNR or UNX Only; Not run for Reference Board #E8251-60348)

This adjustment calibrates the absolute instrument frequency by adjusting the reference oscillator's frequency.

During this adjustment, the instrument is set to a given frequency and two DACs are adjusted until the output frequency equals the set frequency.

Allow the DUT to warm up for a minimum of 60 minutes. The instrument is set for an output frequency of 10 MHz. The fine tune DAC (Fine_dac) is set to mid-range and the coarse tune DAC (Coarse_dac) is adjusted so that the RF output frequency is as close to 10 MHz as possible. Finally, the fine tune DAC is adjusted so that the output frequency is 10 MHz. The internal reference oscillator can be adjusted to the resolution of the frequency counter being used.

Test Equipment

Preferred Model

Alternate Model(s)

Frequency Counter

53230A Opt 010 and (106 or 115)

53132A Opt 010 and (050 or 124)

 

Connections and Setup Procedures

  • With the exception of the 53132A Option 050 or 124, or the 53230A Option 106 or 115 frequency counter, all test equipment requires a 30 minute warmup period to ensure accurate performance.

  • The frequency counter must be plugged into the AC power line for at least 24 hours before testing begins.

  • 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 Timebase 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.