Q-P Detector Variation with Pulse Repetition Freq Performance Test

This test will measure the Quasi-Peak detector’s response to varying PRFs. The Quasi-Peak Detector has a specific rise and fall response defined in CISPR 16-1-1 (Section 5.2.2). The Quasi-Peak Detector is intended to emulate the response of a mechanical meter’s response to an impulsive signal.

In this test, DC Pulse is applied to the EMI receiver. The DUT is tuned to a frequency within the band of interest. The DUT is placed in zero span, and the sweep time is set to capture at least 1 pulse during a sweep. The pulse generator is set to the reference PRF and the reference amplitude is then measured. Next, the PRF is varied and subsequent amplitude measurements are performed. The amplitudes are normalized to the reference amplitude and compared to the CISPR specification.

Troubleshooting

You may get a GPIB connection error when using the IGUU 2918.

There is a known issue with certain versions of the Keysight IO Library not recognizing the Schwarzbeck IGUU 2918 pulse generator and therefore causing a GPIB connection failure. There are two work-around methods to correct this error. Refer to the Connecting GPIB Instruments section of Getting Started for more information.

Click here for troubleshooting.

Required Test Equipment

Test Equipment

Recommended Model Number

Alternative Model Number

CISPR Pulse Generator1

Schwarzbeck IGUU 2918

Schwarzbeck IGUU 2916

Cable, Type-N

11500C

 

Adapter, Type-N (f) to 3.5 mm (f)

  • For Option C35

1250-1745

 

Adapter, Type-N (f) to 2.4 mm (f)

  • For Option 544

11903B

 

  1. Both models of the Schwarzbeck pulse generator have fixed GPIB addresses which may require changing the GPIB address of conflicting equipment. Refer to the Connecting GPIB Test Instruments section of Getting Started.

Connection Setups

Click on the links below for images depending on the pulse generator model being used.