Synthesizer Offset Pretune Calibration (Adjustment)

(N5181B / N5182B / N5182N)

The RF ABUS Calibration must be performed prior to this adjustment.

The goal of this calibration is to determine the optimal offset pretune DAC setting for each offset loop frequency. This data is used by firmware to pretune the offset loop system to guarantee that the offset loop locks to the correct frequency. The offset loop is opened and the adjustment is performed using the offset loop under/over indicators to determine the optimal offset loop control DAC setting. The loop is then closed and the integrator voltage is measured to ensure that the loop locked to the correct frequency.

Required Test Equipment

Test Equipment

Recommended Model

Alternate Model(s)

Spectrum Analyzer

PXA N9030B Option Pxx1

 

PXA N9030A Option Pxx1

PSA models Option [1DS or 110]1:
E4440A
E4443A
E4445A
E4446A
E4447A
E4448A

  1. Preamp option (Pxx for PXA, 1DS or 110 for PSA) is recommended but not required.

 

Connections and Setup Procedures
  • All test equipment requires a 30 minute warmup period to ensure accurate performance.
  • In the following setup, cables are designated as solid lines and direct connections are designated as dashed lines.

Initialize Test Equipment

  1. Connect all test equipment as shown.
  2. Preset all test equipment and the signal generator.

 

Setup for Synthesizer Offset Pretune 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. Refer to the troubleshooting section of the 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 necessary, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.