Diagnostics Theory

RF_DIAGS

Open Loop ALC Drive

This test opens the ALC loop and checks the voltage that appears on the output of the modulator with the DAC at full scale, measured at the OUT_ALC_DRIVE using the voltmeter referenced to the -6 Vdc measurement.

Output Detector, Detector Caps

The output capacitors are switched in and out and the output level is measured by the voltmeter at the OUT_OUTPUT_LEVEL output.

Output Detector, Low Level

When the carrier level DAC is set to 0, there should be no RF output detected by the voltmeter measuring at the OUT_OUTPUT_LEVEL output.

Output Frequency Range, Loop Closed

The frequency is varied and the detector voltage is measured by the voltmeter at the OUT_OUTPUT_LEVEL output.

Bandwidth Control

The bandwidth control bits are varied and the detected output is measured by the voltmeter at the OUT_OUTPUT_LEVEL output.

Tracking Filter Rejection

The ALC loop is opened and the tracking filters are checked by setting the RF frequency to the center of the two bands while changing the filter DAC to below the RF frequency and measuring the detected level with the voltmeter at the OUT_OUTPUT_LEVEL output.

Pulse Attenuator and Drive

This test checks the A14 Pulse Driver assembly.

Pulse Attenuator and Drive Test

A reference measurement is made and the signal is pulsed using the front panel AUDIO OUT to drive the front panel MODULATION IN PULSE input.

13 MHz Oscillator Lock Detector

The 13 MHz VCO lock detector is measured to check the 13 MHz VCO.

Input Section

This test checks the A23 Input assembly.

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Agilent Technologies 8922 manual Pulse Attenuator and Drive, Input Section
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8922 specifications

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