Agilent Technologies 8935 Series Specifikace stáhnout pdf (Strana 168)

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Chapter 7 167

Periodic Adjustments

Periodic Calibration Menu Descriptions

Figure 7-4 Measurement (A2A33) Assembly Test Points

Audio Frequency Generator Gain

The gain of the following paths is calibrated:

• The internal paths that run from Audio Frequency Generators 1 and

2 (individually) through the Modulation Distribution assembly, to

the monitor select output, then onto Audio Analyzer 1 to the DVM.

• The paths that run from Audio Frequency Generators 1 and 2

(individually) through the Modulation Distribution assembly to the

AUDIO OUT connector, externally to the rear-panel MODULATION

IN connector, then again through the Modulation Distribution

assembly to the monitor select output and to the DVM.

The above-measured levels are used to adjust the output level of the

audio generators so that they produce a calibrated level to the

modulation inputs of the RF generator. These measurements are made

at DC. Both positive and negative levels are measured to produce an

optimum calibration factor.

SGND

+REF -REF

Measurement Board Assembly

a2a33_1.eps

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