If Amplitude Adjustments - Agilent Technologies 8564EC Service Manual

Spectrum analyzers

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Manual Adjustment Procedures

2. IF Amplitude Adjustments

. 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

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

causes the IF gain adjustment to use the

ADJ CURR IF STATE

"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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