Internal Pulse Modulation Level Accuracy

(E8257D/E8267D Option UNU, UNW, UNS, or HNS, E8257N Option 340, and E8663D Only)

This test verifies that the pulse level accuracy of the internal pulse modulator meets specifications.

During the test, the peak-to-peak amplitudes of the CW and PULSE ON signals are measured with a high-frequency, digitizing oscilloscope. The signal generator is placed in CW mode at a certain power level and an oscilloscope is used to measure the peak-to-peak excursion. The signal generator is then pulse modulated by its internal pulse generator and the peak-to-peak measurement is repeated with an oscilloscope.

Required Test Equipment

Test Equipment

Recommended Models

Alternate Model(s)

Oscilloscope Mainframe

N1000A

86100D
86100A (with firmware A.03.03 or greater)
86100B/C
54750A (see procedure below)

Oscilloscope Plug-In

N1045B1

N1045A1
N1055A1, 2

86117A
86117B
83484A
54752A
86112A (Only for E8257D/67D Opt 520/521 and E8663D)

20 dB Attenuator

8493C Opt 020

 

10 dB Attenuator

8490D Opt 010

8493C Opt 010 (Only for E8257D/67D Opt 520/521/H26 and E8663D)

  1. Only supported by the N1000A and 86100D oscilloscopes.
  2. Requires 50 GHz option (52F, 52M, 54F, or 54M) for use with DUTs with a maximum frequency of 40 GHz or greater.

Plug-In Module Vertical Calibration (for the 54750A)

  1. Remove any front-panel connections from electrical channels.

  2. Press Utility > Calibrate... > Calibrate plug-in...

  3. Select the plug-in module to be calibrated, then press 1 and 2 or 3 and 4

  4. Press Start cal to start the calibration.

  5. Follow the on-screen instructions.

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 performance test, follow all instructions on the controller display.

Setup for Pulse Modulation Level Accuracy

For legacy test equipment, .

 

Setup for Pulse Modulation Level Accuracy (using plugin trigger)

Setup for Pulse Modulation Level Accuracy (using mainframe trigger)

 

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.