Pulse Modulation On/Off Ratio

A dc voltage is used to switch the UUT pulse modulation on and off. A spectrum analyzer is used to measure the power of the fundamental (CW) frequency of the UUT with the pulse on and off. The difference in these power levels is the pulse on/off ratio, in dB.

Required Test Equipment

Test Equipment

Critical Specifications for This Test

Recommended Models

Alternate Models

Spectrum Analyzer

Marker Accuracy
Log Fidelity

N9030B Opt 5xx1

N9030A Opt 5xx1

E444xA2 Opt 233

Function Generator

None

33622A

33250A
33120A Opt 001
33611A
33612A
33621A

  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 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 test, follow all instructions on the controller display.

 

In Case of Difficulty

If this performance test 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 performance test.

  2. If this test 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.