598 Chapter11
RF Section
A15 RF Assembly
A15 RF Assembly
NOTE The block diagrams for the A14 and A15 assemblies are located in
Chapter 10, "Synthesizer Section."
Confirming a Faulty Third Converter
1. Perform the "IF Input Amplitude Accuracy" performance test in the
HP 8560 E-Series Spectrum Analyzer Calibration Guide if Option
002 is not present. This exercises most of the third converter.
2. If the performance test fails or Option 002 is present, perform the
"External Mixer Amplitude Adjustment" in Chapter 2.
3. If adjustment cannot be made, disconnect W35 (coax 92) from
A15J801.
4. On the HP 8560E/EC, press
PRESET and set the controls to the
following settings:
Center frequency ......................................................300MHz
Span ..................................................................................0Hz
5. Connect a signal generator to A15J801.
6. Set the signal generator to the following settings:
Frequency .......................................................310.7MHzCW
Power ................................................................................. −28dBm
7. If a flat line is displayed within 2 dB of the reference level and the
performance test passed, troubleshoot microcircuits A7, A8, A9, and
A13.
8. If a flat line is displayed within 2 dB of the reference level and the
performance test failed, troubleshoot the A15 RF Assembly.
9. Disconnect the signal generator and reconnect W35 (coax 92) to
A15J801.
Confirming a Third Converter Output
1. Connect the HP 8560E/EC CAL OUTPUT to the INPUT 50 Ω
connector.
2. Set the HP 8560E/EC to the following settings:
Center frequency ......................................................300MHz
Span ..................................................................................0Hz
Input attenuation ...........................................................10dB
3. Press
SGL SWP, CAL, IF ADJ OFF.
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