Overload Detector Adjustment

This adjustment applies to the following models:

The EMI receiver Overload Detector is adjusted by inputting a known signal level and adjusting the Overload DAC until the Overload Indicator is tripped. The DAC value is then stored in memory.

The PXE EMI receiver RF Preselector is comprised of 17 unique signal paths, and 3 additional paths for option WF1. Each path will have its own unique Overload DAC setting. The Overload Detector DAC value will be determined for all the paths. Some of the wider filter segments have multiple DAC values. The Overload DAC is a 10-bit DAC.

This adjustment will use the Schwarzbeck EMI Pulse Generator below 1 GHz. Above 1 GHz, a PSG signal generator with Option UNW will be used to generate pulse modulated signal.

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.

Required Test Equipment

Test Equipment

Recommended Model Number

Alternative Model Number

DC Pulse Generator

Schwarzbeck IGUU 29181

Schwarzbeck IGUU 29161

Microwave Signal Generator #1

PSG Models
(see equipment list)

 

Cable, Type-N

11500C

  

Cable, BNC

8120-1840

  

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

  • For Option C35
  • For 3.5 mm source

1250-1745

  

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

  • For Option 544
  • For 2.4 mm source

11903B

  
  1. The pulse generator has a fixed GPIB address 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.

Overload Detector Band A/B Adjustment Setup, RF Input 1,
Schwarzbeck IGUU 2918

 

Overload Detector Band C/D Adjustment Setup, RF Input 1,
Schwarzbeck IGUU 2918

 

Overload Detector Band A/B Adjustment Setup, RF Input 2,
Schwarzbeck IGUU 2918

Overload Detector Band C/D Adjustment Setup, RF Input 2,
Schwarzbeck IGUU 2918

 

Overload Detector Band A/B Adjustment Setup, RF Input 1,
Schwarzbeck IGUU 2916

Overload Detector Band C/D Adjustment Setup, RF Input 1
Schwarzbeck IGUU 2916

Overload Detector Band A/B Adjustment Setup, RF Input 2
Schwarzbeck IGUU 2916

Overload Detector Band C/D Adjustment Setup, RF Input 2,
Schwarzbeck IGUU 2916

Overload Detector Above 1 GHz