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.

Required Test Equipment

Instrument

Critical Specifications for This Test

Recommended Model1

Spectrum Analyzer

Marker Accuracy; Log Fidelity

E444xA2 Opt 1DS, 1233

Function Generator

None

33250A
  1. Refer to the main equipment list for alternate models.
  2. Depending on your frequency range needs, choose either an E4440A, E4443A, E4445A, E4446A, or E4448A. (E4447A is for Power Level Accuracy adjustment only.)
  3. Options 1DS and 123 are for ESGs > 3 GHz.

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.
  • Connect all test equipment as shown.
  • Connect GPIB cables to all GPIB-controlled test equipment.
  • While performing this test, follow all instructions on the controller display.
  • When testing Option 1E6, use the ESG PULSE IN connector in place of the EXT 2 INPUT.

 

Option 1E6 Test Setup