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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 Modulator<br />

7-20 Adjustments<br />

<strong>HP</strong> <strong>8648</strong>A Only<br />

Description<br />

Required Test<br />

Equipment<br />

Procedure<br />

This is the AM Accuracy adjustment for the <strong>8648</strong>A. This adjustment<br />

performs the two adjustments to the output board that require the<br />

use of the voltmeter. It sets up the multiplexer on the output board to<br />

measure dc voltages while the potentiometers are being adjusted.<br />

Measuring Receiver<br />

Function Generator<br />

w Audio Analyzer<br />

DVM<br />

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

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

DIGITAL MULTIMETER<br />

@jiii&<br />

FUNCTION<br />

GENERATOR<br />

an61 5a2d<br />

output<br />

I<br />

<strong>HP</strong> 6646<br />

UNDER TEST<br />

J31-1 A<br />

Figure 7-20. AM Modulator Test Setup<br />

AUDIO ANALYZER

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