Low Power Attenuator Accuracy Calibration

(E8257D/E8267D/E8663D with Option 1E1 and E8257N Only)

The Low Power Attenuator Calibration calibrates the accuracy of the power flatness when internal attenuation >= 30 dBm is being applied by the DUT. A spectrum analyzer is used for this calibration (versus a power meter/power sensor solution) to provide greater accuracy. Due to the limitations of the Performance Spectrum Analyzer (maximum frequency of 50 GHz), this calibration is limited to 50 GHz for E8257D Option 567 units. Option 567 units require a separate calibration (V-Band Low Power Attenuator Accuracy) which uses a V-Band Power sensor in order to complete this measurement.

Test Equipment	Preferred Model	Alternate Model(s)
Spectrum Analyzer	E444xA¹

1.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. An E4448A is required for units with Option 567. The E4448A frequency range is adequate for all PSG-D frequency configurations.

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.

Connect all test equipment as shown.
Connect GPIB cables to all GPIB-controlled test equipment.
While performing this adjustment, follow all instructions on the controller display.

Setup for Low Power Attenuator Accuracy Calibration

In Case of Difficulty

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

Check the equipment setup (see above). If the setup is incorrect, make the necessary corrections and rerun the adjustment.
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.
If you cannot correct the problem using the troubleshooting procedures in the Service Guide, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.