116 Chapter3
Manual Adjustment Procedures
2. IF Amplitude Adjustments
2. IF Amplitude Adjustments
The IF amplitude adjustments consist of the cal oscillator amplitude
adjustment and the reference 15 dB attenuator adjustment.
Assembly Adjusted
A4 log amp/cal oscillator A5 IF assembly
Related Performance Tests
IF Gain Uncertainty Scale Fidelity
Description
This adjustment sets the output amplitude of the A4 log amp/cal
oscillator and the absolute amplitude of the reference 15 dB attenuator.
The output of the A4 log amp/cal oscillator is adjusted so that a
−55 dBm signal applied to the 10.7 MHz IF input on the A5 IF assembly
(A5J3) causes a displayed signal of −60 dBm. The effect of this
adjustment is visible only after the
ADJ CURR IF STATE sequence is
complete.
ADJ CURR IF STATE causes the IF gain adjustment to use the
"new" output amplitude from the A4 log amp/cal oscillator.
This procedure also sets the attenuator of the reference 15 dB
attenuator so that a source amplitude change of 50 dB combined with a
spectrum analyzer reference level change of 50 dB displays an
amplitude difference of 50 dB.
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