HP 8340B Manual page 280

5-14.
UNLEVELED RF OUTPUT ADJUSTMENTS (Cont'd)
33. Press the following key sequence
on the DUT:
For an HP 8340B
[INSTR PRESET]
[START FREQ] [1] [9] [.] [8] [GHz]
[XTAL]
[SWEEPTIME] [2] [0] [0] [msec]
[SAVE] [1]
[SWEEPTIME] [AUTO]
[SAVE] [2]
[SINGLE]
[SAVE] [3]
[RECALL] [2]
For an HP 8341 B
[INSTR PRESET]
[START
FREQ] [1] [3] [.] [3] [5]
[GHz]
[XTAL]
[SWEEPTIME] [2] [0] [0] [msec]
(500 mS
if
the
DUT
has Option 003)
[SAVE] [1]
[SWEEPTIME] [AUTO]
[SAVE] [2]
[SINGLE]
[SAVE] [3]
[RECALL] [2]
34. Adjust the
scope's
vertical and horizontal sensitivity to view the swept display. The horizontal
gain
should be set so the trace
covers
the full display from left to
right.
35. Access Calibration Constant 75 by pressing the following key sequence on the DUT:
[SHIFT]
[GHz] [7] [5] [Hz]
[SHIFT] [MHz] [1] [2] [Hz]
[SHIFT] [kHz] [2] [2] [Hz]
NOTE
The
range for the delay compensation Cal constants, numbers
2
through
8, is
0
to
131. If
the Cal
Constants do not provide sufficient
range
for the
delay compensation,
Cal Constant 8 should be lowered (Cal Constant
7
for
the
HP 8341B), A28R22 (DYO) and A28R19 (DYS) readjusted, and then
the SYTM DELAY COMPENSATION ADJUSTMENTS BY BAND procedure
should
be repeated.
36. Adjust
A28R22
(DYO) for optimum power
in the first half of the display. Ignore the small
power
dropout at
the
beginning of the
sweep,
this will be eliminated later.
37. Adjust A28R19 (DYS)
for
optimum power
in
the second half of the display. Iterate
between steps
36 and 37
until
optimum
power
is
achieved across the band.
38. Using the DUT's rotary knob, adjust Cal Constant
75 (range is 0
to 500)
to optimize the power
in
the first
division (left hand side) of the display (i.e., eliminate the small
power dropout).
HP 8340B/41B
Adjustments
5-81