HP 8340B Manual page 287

5-14.
UNLEVELED RF OUTPUT ADJUSTMENTS (Cont'd)
74. Using the [^]
key on both the OUT
and the LO, step through Band 2. observing the
Spectrum
Analyzer display at
each step. There may be
responses
due to mixing products. These will
appear
as
low level signals.
A
squegging response
will
appear
as
a
higher amplitude signal
as
shown
in
Figure
5-44.
If
squegging occurs at
DUT
frequencies below
10 GHz, adjust A24R3 (X2A)
slightly
CCW
to eliminate squegging.
If
squegging occurs at frequencies above
10
GHz,
adjust A24R4
(X2B)
to eliminate the squegging. Note, if
the control
is
adjusted and there
is
no effect on the
response, the response is
probably
a
mixing product.
75. For Band 3, press the Local Oscillator
[START FREQ]
and
enter [1] [2] [.] [9] [GHz]. Press [STOP
FREQ]
and enter
[1] [9]
[.]
[4] [GHz].
Press
[MANUAL]
and enter
[1] [2]
[.]
[9] [GHz].
76. On the
DUT
press
[POWER LEVEL]
and enter
[2] [0] [dBm].
Press
[START FREQ]
and enter
[1] [3]
[-1
[5] [GHz].
Press
[STOP FREQ] and enter [2] [0] [GHz].
Press
[MANUAL]
and enter
[1] [3] I.] [5] [GHz].
77. Using the step keys as
described
in
step 26, step
through
Band
3.
If
squegging occurs below
15
GHz,
adjust
A24R6 (X3A)
slightly CCW
to eliminate the squegging.
If
squegging occurs above 15
GHz, adjust A24R7
(X3B).
Band
4 Adjustments, HP 8340B only
78. For Band
4,
press
the Local Oscillator
[START FREQ]
and enter [1] [9]
[.]
[4] [GHz]. Press
[STOP FREQ]
and enter
[2] [5] [.]
[9]. Press
[MANUAL]
and enter
[1] [9]
[.]
[4] [GHz].
79. On the
DUT press [START FREQ]
and
enter [2] [0]
[GHz].
Press
[STOP FREQ]
and enter
[2] [6]
[•]
[5] [GHz].
Press
[POWER LEVEL]
and enter
[2] [0] [dBm]
Press [MANUAL] and enter
[2][0][GHz].
80. Using the step keys as described
in
step 26, step through Band
4.
If
squegging occurs below
23 GHz,
adjust
A24R9 (X4A) slightly CCW to eliminate the squegging. If squegging occurs
above
23 GHz, adjust A24R10
(X4B).
NOTE
If adjustments of the calibration constants were made
in this procedure,
the data thus stored in the "working memory
area"
should
be copied to
the "protected memory area" by pressing the following key
sequence:
[SHIFT] [1] [4] [Hz] [SHIFT] [kHz] [5] [3] [4] [9]
[Hz]
[INSTR PRESET].
5-88
Adjustments
HP 8340B/41B