Diagnostics Theory

RF_DIAGS

RF Detectors 1

The low and high sensitivity detectors are checked both with and without a signal present.

Step Attenuator

The step attenuator is checked by switching in one pad at a time.

RF Detectors 2

The filter output detector is checked with no signal present.

Filter Output Detector, Signal Present

The filter output detector is checked with a signal present at different frequencies.

Output Filter Rejection

Each filter is checked to see that it rejects frequencies outside its passband.

Output Variable Attenuator

The variable attenuator is checked by programming the DAC to full scale, then reading the voltage on the output detector. Then the DAC is programmed to values which turn on the 5 most significant bits one at a time, starting with the MSB and measuring the detector output each time.

Autorange Attenuator

The autorange attenuator is programmed to each of its possible values and the output detector is measured each time.

Counter With TTL Dividers

The signal from the RF generator is routed to the counter TTL prescalers. The frequency of the signal is set to all values between 10 and 250 MHz in 5 MHz steps.

Counter With ECL Dividers

The signal from the RF generator is routed to the counter ECL prescalers. The frequency of the signal is set to all values between 50 and 1000 MHz in 50 MHz steps.

Temperature Sensor

The temperature sensor produces a DC voltage proportional to the internal temperature.

RF Analyzer Step Loop

This test checks the A17 Step Loop B assembly.

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Agilent Technologies 8922 manual RF Analyzer Step Loop

8922 specifications

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