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HP 8648 A/B/C/D - Changpuak.ch

HP 8648 A/B/C/D - Changpuak.ch

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AM Level and<br />

Distortion<br />

<strong>HP</strong> <strong>8648</strong>8 Only (Not used for serial prefixes 2 3847A/3847U)<br />

AM Level and Distortion<br />

Description This adjustment adjusts AM level accuracy and distortion on the<br />

output module. It also zeros the general loss and attenuation arrays.<br />

It uses the DVM to measure the dc voltages that are being adjusted on<br />

the output module.<br />

Required Test Function Generator<br />

Equipment w DVM<br />

H 531 Test Point Extender (refer to the “Test Point Extender” section<br />

at the front of this <strong>ch</strong>apter)<br />

Procedure BNC TEE<br />

FUNCTION<br />

GENERATOR<br />

FUNCTION<br />

GENERATOR<br />

J31-1 Chassis GND<br />

<strong>HP</strong> 0646 UNDER TEST<br />

DIGITAL MULTlMETER<br />

Figure 7-6. AM Level and Distortion Test Setup 1<br />

BNC TEE<br />

<strong>HP</strong> 6648 UNDER TEST<br />

;I<br />

DIGITAL MULTlMETER<br />

Figure 7-7. AM Level and Distortion Test Setup 2<br />

Adjustments 7-9<br />

an61 7a2d<br />

an61 Ba2d

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