HP 8340B Manual page 251

5-8.
YO LOOP ADJUSTMENTS (Cont'd)
28. Using the rotary knob on the Spectrum
Analyzer, move
the
marker to
the point where the two
traces
cross. Observe the marker frequency on the Spectrum Analyzer. The marker (crossover
frequency) should be between
30
and
40 kHz.
29.
If
the
crossover
frequency
is
below 30 kHz, the value of A49R18
on the
A49 YO Phase Detector
board should be decreased in value to increase the crossover frequency.
If the
crossover fre¬
quency
is
above 40 kHz, the
value of A49R18 should be increased to lower the crossover
fre¬
quency.
30. Disconnect
all
test equipment from the DUT and reinstall the jumper (W1)
on the
A49 Phase
Detector board.
31. Proceed directly to Adjustment 5-9, FM Accuracy and FM Overmod Adjustment. DO NOT
REASSEMBLE THE YO LOOP.
HP 8340B/41B
Adjustments 5-49