HP 8340B Manual page 310
Synthesized sweepers
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- Manual (530 pages) ,
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5-16.
LEVELED RF OUTPUT ADJUSTMENTS (Cont'd)
40. Set the spectrum analyzer for PULL SPAN of 0-2.5 GHz. Set RES BW for 300 kHz. Set VIDEO BW
for 100 kHz. Set
START FREQ
to
590 MHz. Set STOP FREQ
to 800 MHz. Set REFERENCE LEVEL
to
-10
dBm. Set ATTEN to
0
dB. Press
HOLD
to retain
these settings. The 600 MHz IF
signal
should be near the
left side
of
the
spectrum analyzer CRT.
41. Using the
[^]
key on both the DUT and the
LO,
step through Band
2
observing the spectrum
analyzer
display
at each step. There may be signals due to mixing products, and/or squegging.
Mixing
products
will
appear as
low level signals. Squegging signals will
appear as
a
higher
ampli¬
tude signal as shown
in
Figure 5-60.
If
squegging occurs, adjust A24R5 (X2C) slightly CCW to
eliminate the squegging. Note,
if
the
control
is
adjusted and
there
Is
no effect on the signal, the
signal
is
probably
a
mixing product.
NOTE
Test for squegging
at power levels from maximum leveled power to —20
dBm
in 5
dB increments.
SYNTHESIZED
SWEEPER
OUT
(LOCAL
OSCILLATOR)
^
ADAPTER
APC-3.5(f»
to N(m)
(83418
ONLY)
^-c=^
10dB
ATTENUATOR
MIXER
RF
OUTPUT
SPECTRUM ANALYZER
^•'cnn&^
ADAPTER
APC-3.5(t)
to APC-3
5(f)
(8340B
ONLY)
Figure
5-59.
Leveled Squegging Test Setup
42. On
the
DUT, press [SHIFT] [PWR SWP]
and enter the maximum
ALC power
level
that
will
be
a
5
dB increment below max leveled power
(i.e.,
15,10,
5).
Repeat step
41 at this
power
level. Enter
the next
5
dB increment and repeat step
41 until
the test for squegging has been performed from
maximum
leveled
power to —20 dBm.
43. For Band 3, press the LO
[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].
Adjustments
HP 8340B/41B
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