Lock Angle

This adjustment is only performed on ESGs without Option UNJ. The adjustment optimizes the time the phase detector samples the reference frequencies of the synthesizer phase-locked loop.

The lock angle adjustment sets the time during the reference cycle when the ultra quiet time phase detector measurement occurs. The phase detector needs to make its measurement at the quietest point in the reference cycle. By adjusting the pot to minimize the level of the Frac-N spur, the timing of the phase detector measurement is optimized.

Required Test Equipment

Test Equipment

Recommended Models

Alternate Models

Spectrum Analyzer

N9030B Opt 5xx1

N9030A Opt 5xx1
E444xA2

  1. Select any option of PXA spectrum analyzer (503, 508, 513, 526, 543, 544, 550) that has a maximum frequency greater than or equal to the maximum frequency of the unit under test.

  2. Select any model of PSA spectrum analyzer (E4440A, E4443A, E4445A, E4446A, E4447A, E4448A) that has a maximum frequency greater than or equal to the maximum frequency of the unit under test.

Connections and Setup Procedures
  • All test equipment requires a 30 minute warmup period to ensure accurate performance.
  • In the following adjustment 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.

 

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.