Overload Detector Adjustment

This adjustment applies to the following models:

N9038A MXE
N9038B MXE

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 EMI receiver RF Preselector is comprised of 23 unique signal paths. Each path will have its own unique Overload DAC setting. The Overload Detector DAC value will be determined for 16 paths. Some of the wider filter segments have multiple DAC values. Some paths will have the DAC defaulted to 255 (the maximum value). The Overload DAC is an 8-bit DAC.

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
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

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 Adjustment

This adjustment applies to the following models:

Troubleshooting

Required Test Equipment

Connection Setups

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 1Schwarzbeck IGUU 2916

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

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

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