Pulse Modulation On/Off Ratio

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

Instrument

Critical Specifications for This Test

Recommended Model

Function Generator

none

33120A, 33250A

Spectrum Analyzer

Marker Accuracy; Log Fidelity

E4440A, E4443A, E4445A, E4446A, E4448A,
8565E, 8565EC

 

Connections and Setup Procedures

All test equipment requires a 30 minute warm-up period to ensure accurate performance.

In the following test setup, direct cable and adapter connections are designated as solid lines. Changeable cable and adapter connections are designated as dashed lines.

When testing Option 1E6, use the ESG PULSE IN connector in place of the EXT 2 INPUT.

 

  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.
     

Option 1E6 Test Setup