HP 8340B Manual page 306

5-16.
LEVELED
RF OUTPUT ADJUSTMENTS (Cont'd)
A.
TYPICAL DET WAVEFORM B TYPICAL MOD LVL WAVEFORM
>ADJUST FO
THIS POINT
C.
TYPICAL MOD LVL MINUS DET WAVEFORM
Figure 5-56. Typtcal
MOD L VL
and
DET
Waveforms
for ALC
Loop Gain Adjustment
NOTE
In
steps 25 through
29, the oscilloscope display will be adjusted for the
most horizontal line. This
adjustment is
only concerned with the trace up
to
where
it
deviates from
a
flat line (see Figure 5-56,
Waveform
C).
This
point
on
the display will change position with frequency.
25. On the oscilloscope, invert CHAN
B
and select
DISPLAY
A+B
mode. Using the
DUT's step
keys,
step the
CW frequency
through Band
0
from 10
MHz to
2.21
GHz and adjust
A26R43 (HET)
for the
most horizontal line across Band 0.
26. On the DUT, press
[CW] [2]
[.]
[3] [GHz].
Using the DUT's step keys, step the CW
frequency
through Band 1
from 2.3 to
6.9
GHz
and adjust
A26R45
(X1) for the most horizontal
line across
Band1.
Adjustments HP 8340B/41B