1/f Corner Calibration

(E8267D Only)

This adjustment improves performance at low symbol rates. 1/f Corner is the symbol rate where the noise floor of the I/Q modulated output signal rises to 3 dB over the noise floor at the reference symbol rate of 1 Msps.

The program applies a test signal and the I/Q multiplexer attenuator is set to 40 dB. Measurements of Carrier Power vs. Adjacent Channel Power are made at 1 Msps and 10 ksps. The data is then used to calculate a corrected power for slower symbol rates.

Test Equipment

Preferred Model

Alternate Model(s)

Spectrum Analyzer

E444xA1

 

External Baseband Signal Generator
Not required for Opt 601 or 602

E4438C Opt 402 and (001, 002, 601, or 602)

E8267D Opt (601 or 602)
E8267C Opt (002 or 602)
E4430B Opt UN8, E4431B Opt UN8,
E4432B Opt UN8, E4433B Opt UN8,
E4434B Opt UN8, E4435B Opt UN8,
E4436B Opt UN8, E4437B Opt UN8

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.

  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 1/f Corner Power Calibration (Options 601,  602 Only)

 

Setup for 1/f Corner Power Calibration (All models without Option 601, 602)

 

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. Please check and ensure that the 856xE/EC series spectrum analyzer's external reference is connected. The spectrum analyzer will lock up and not take a sweep when external reference is selected and there isn't one connected to it.

  3. If this adjustment fails after step 1 and step 2, 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.

  4. If you cannot correct the problem using the troubleshooting procedures in the Service Guide, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.