HP 8340B Manual page 283

5-14.
UNLEVELED RF OUTPUT ADJUSTMENTS (Cont'd)
Band
1
Delay Compensation
55. Press the following key
sequence
on the DUT:
[CONT] (If not already
in continuous
sweep
mode)
[SHIFT] [METER] [-] [5] [0] [dBm]
[START FREQ] [2] [.] [3] [GHz]
[STOP PREQ] [7] [.] [0]
[GHz]
[SWEEPTIME] [2] [0] [0] [msec] (500 mS
if
the DUT
is
an
HP
8341 B Option 003)
[SAVE] [1]
[SWEEPTIME] [AUTO]
[SAVE] [2]
[SINGLE]
[SAVE] [3]
[RECALL] [2]
Adjust the
scope's vertical position
and/or sensitivity to view the
swept display. The SHIFT
METER
mode is
being implemented to allow the Band 1 delay compensation to be adjusted
without any squegging2 present.
56.
Access Cal Constant 5 by pressing
[SHIFT] [GHz] [5] [Hz] [SHIFT] [ENTRY OFF]
on the DUT.
Using the DUT's rotary knob, adjust Cal Constant
5
(range
is 0
to 131) to
optimize the power
across the entire
Band.
57. Press
[RECALL]
on the
DUT
and iterate between registers
1
and
2 by pressing
[1]
and then [2].
Verify that the fast sweep speed trace (register 2)
is
no
more than
2 dB below the slow sweep
speed trace (register 1) at any
point.
If
this condition
is
not met,
repeat steps 56 and 57.
58. Iterate between registers
1
and
3
and verify that the single sweep trace (register 3)
is
no more than
2
db below the slow sweep trace at any point. After pressing [3] on
the
DUT
you need
to
press
[SINGLE]
to initiate the single
sweep.
If
this condition is
not met, repeat
steps 56 through 58.
Multiband Delay Compensation Adjustments
59. Press the following key sequence on the DUT:
[INSTR PRESET]
[START FREQ] [2] [.] [3] [GHz]
[XTAL]
[SWEEPTIME] [1] [sec]
[SAVE] [1]
[SWEEPTIME] [AUTO]
[SAVE] [2]
[SINGLE]
[SAVE] [3]
[RECALL] [2]
Adjust the scope's vertical position and/or sensitivity to view the swept display.
2
Squegging
in
Band 1
(23
to
70
GHz)
is seen as large power drop outs and spurious
signals
on the RF output Band
1
squegging is
a (unction
of
input power
into the
SYTM
and cannot be adjusted out Band
1
squegging will only occur
if
maximum available power is
requested from the
OUT (i
e
,
maximum unleveled power) Since this
is
the
case, Band 1
squegging
will normally not
occur when the DUT
is
set to maximum
specified power and below
5-84 Adjustments
HP 8340B/41B