If Amplitude Adjustments; If Amplitude Adjustment Setup - HP 8562E Service Manual

4. IF Amplitude Adjustments

The IF amplitude adjustments consist of the cal oscillator amplitude adjustment and the
reference 15 dB attenuator adjustment.
A4 log amp/Cal oscillator
A5 IF assembly
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
complete. ADJ CURR IF STATE
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.
2-26 Adjustment Procedures
causes the IF gain adjustment to use the "new" output
TEST CABLE
I
Figure 2-7. IF Amplitude Adjustment Setup
sequence is
S P E C T R U M I
A N A L Y Z E R '
A5 IF BOARD
AMP/
SK16