HP 8340B Manual page 284

5-14.
UNLEVELED RF OUTPUT ADJUSTMENTS (Cont'd)
60. Access Cal Constant
4 by pressing the following key sequence
on
the DUT:
[SHIFT] [GHz] [4] [Hz]
[SHIFT] [MHz] [1] [2] [Hz]
[SHIFT] [kHz] [2] [2] [Hz].
If the DUT
is
an
HP 8341 B, proceed to step
62.
61.
Using the
DUT's rotary
knob, adjust Cal Constant
4
(range
is
0 to
131) to optimize the power
in
Band
4.
62.
Access Cal Constant
3
by pressing the [^]
step
key. Using the DUT's
rotary knob, adjust Cal
Constant
3
(range
is 0 to 131)
to optimize the power
in
Band 3.
63. Access Cal Constant
2
by pressing the [^]
step
key. Using the
DUT's rotary knob, adjust Cal
Constant
2
(range
is 0
to 131) to optimize
the
power
in Band
2.
64. Access
Cal Constant 77 by pressing [SHIFT] [GHz] [7] [7] [Hz] [SHIFT] [ENTRY OFF]
on the
DUT.
Using the
DUT's rotary knob, adjust Cal
Constant 77
(range
is -25 to
+25)
for
optimum
power
at
the band switch
points.
If this Cal
Constant has no effect, reset
it
to
-25.
65. Press the
[^]
step
key to
access Cal Constant 78.
Using the DUT's rotary
knob,
adjust
Cal
Constant 78
(range is
—25 to +25)
for optimum
power
at the band switch points.
If
this Cal
Constant has no effect, reset
it
to +25.
66. 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
1
dB below the slow sweep
speed trace (register 1)
at
any point
(ignore squegging which
is
most
likely occurring
in
Band 1).
Also,
the minimum power point on the fast sweep speed trace should
be >
1 dB above the
maximum leveled power specifications for each band
(again, ignore
squegging
in
Band
1). If
either
of the above conditions are
not met,
repeat steps 59
through
66.
67.
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 (ignore squegging which
is
most likely occurring
in
Band 1). After pressing
[3]
on the
DUT
you
need to
press [SINGLE] to
initiate the single sweep.
Also, the minimum
power
point on the single
sweep trace
should be
>
1
dB above the maximum
leveled
power
specifications for each band (again, ignore squegging in Band
1). If
either of the
above conditions are not met, repeat steps 59 through 67.
68. Press the following key
sequence
on the DUT:
[RECALL] [2]
[SHIFT] [GHz] [1] [Hz]
[SHIFT] [ENTRY OFF] [5] [0] [0] [Hz]
(Sets Cal
Constant
1
to 500)
Adjust A28R13 (DRP) for optimum
power across
the entire
frequency range.
69. Press the following key
sequence
on the DUT:
[50] [Hz]
(Resets Cal Constant 1
to
50)
[SHIFT] [MHz] [1] [4] [Hz]
[SHIFT] [kHz] [5] [3] [4] [9]
[Hz]
Wait for "CALIBRATION STORED" to
be displayed
in
the
DUT's ENTRY DISPLAY
and then
press
[INSTR PRESET].
HP 8340B/41B
Adjustments 5-85