7-10
Adjustments
Manual Adjustments
AM Level and Distortion (8648A Only)
Not used for serial prefixes ≥ 3847A/3847U.
Description
This adjustment adjusts AM level accuracy and distortion on the output module. It also
zeros the general loss and attenuation arrays. It uses the DVM to measure the dc voltages
that are being adjusted on the output module.
Required Test Equipment
• Function Generator
•DVM
• J31 Test Point Extender (refer to the “Test Point Extender” section at the front of this
chapter)
Procedure
Figure 7-6. AM Level and Distortion Test Setup 1
Figure 7-7. AM Level and Distortion Test Setup 2
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