Agilent Technologies 8922 manual RF Generator Step Loop, Sum Loop, Output Section

Diagnostics Theory

RF_DIAGS

RF Generator Step Loop

This test checks the A26 Step Loop A assembly.

RF Generator Loop 1 MHz Reference Detector

This test checks for the presence of a reference.

RF Generator Loop Lock Detector State

The lock detector is checked at several frequencies.

RF Generator Loop Output Detector

The level detector is checked at several frequencies.

Sum Loop

This test checks the A25 Sum Loop assembly.

RF Generator Sum Loop Lock Detector State

This test checks the lock detector at several frequencies.

RF Generator Sum Loop VCO Tuning Level

This test checks the VCO tune voltage at several frequencies.

Output Section

This test checks the A13 Output assembly.

Power Supplies and Amplifier Bias

The +8 Vdc supply generated by the A13 Output assembly is measured by the voltmeter at the OUT_POS_8V output. The -6 Vdc supply generated by the A13 Output assembly is measured by the voltmeter at the OUT_NEG_6V output. The bias voltage on the output amplifier is measured by the voltmeter at the OUT_AMP_BIAS output.

Carrier Level DAC

The carrier level DAC is checked first by turning on each bit one at a time and then with all the bits on, measuring with the voltmeter at the OUT_LEVEL_REF output. The limits are based on the value of the -6 Vdc measurement.

Filter Tune DAC

The filter tune DAC is checked the same way the carrier level DAC is checked at the OUT_TUNE_FILTER output.

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