Input Attenuation Switching Uncertainty Performance Test

This test applies to the following models:

This test evaluates the accuracy of the input step attenuator (electromechanical or electronic). A source is connected to the analyzer through a composite 10-dB-step and 1-dB-step precision attenuator. The external (reference) and internal (DUT) attenuators are stepped in opposite directions to maintain -81 dBm at the input mixer of the DUT. The DUT display is used to indicate the difference between the change in the internal attenuator and the change in the external composite precision attenuator. As the DUT attenuator is changed, the reference level is changed to keep the trace near the same position on the display.

This test requires step attenuator calibration data to obtain valid results. Make sure you enter the calibration data for the step attenuators that you're using. Please refer to the Enter Equipment Calibration Data section in the TME help for details on how to enter this data. You must enter the data for the following columns to obtain valid results: Attn(dB), Uncert(dB) and ReflSize.

 

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Required Test Equipment

Test Equipment

Recommended Model Number

Low Noise Signal Generator

PSG Models
(see equipment list)

1 dB Step Attenuator

8494G Option 001, H50 

10 dB Step Attenuator

8496G Option 001, H50 

Attenuator Driver

11713B

Attenuator Interconnect Kit

11716A 

6 dB Fixed Attenuator

8491A Option 006, H33

10 dB Fixed Attenuator

8491A Option 010, H33 

BNC Cable

8120-1840 

Type-N Cable
(2 required)

11500C

Viking Cable
(for attenuator)

8120-2703

Type-N (f) to 2.4 mm (f) adapter
(for 2.4 mm source)

11903B

Type-N (f) to 3.5 mm (f) adapter
(for 3.5 mm source)

1250-1745

Connection Setups

In the following setups, cables are designated as solid lines and direct connections are designated as dashed lines.

Input Attenuation Switching Uncertainty Test Setup