Rf Path Assembly-Level Troubleshooting - HP 8340B Manual
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- Manual (327 pages) ,
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- Operating manual (14 pages)
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RF
Path
Assembly-Level Troubleshooting
RF path troubleshooting consists of
checking the
power output
of each microcircuit against the
limits
specified on the
RF
path block diagram.
Because the ALC loop
is
open during power measurements,
the instrument
is
in
an unleveled condition.
NOTE:
The acceptable power
limits for
each microcircuit
in
the
RF path are dependent
on
a
spec¬
ified
input level.
The
minimum input levels
are indicated
on the block diagram.
1.
To
initialize
the instrument, press [INSTR
PRESET] [CW] [XX.XX] [GHz].
The actual frequency depends
on
whether
you
wish to check
the low or
high band.
2.
To
put the instrument
in
an
unleveled
condition, press
[XTAL]
leveling.
3.
Check
the
RF
path frequency dependence across
all
bands by controlling the frequency with the
front panel knob. Verify the
full
frequency bands.
MP5
SCREW
(t
PLACES)
MPB
WASHER
(4.
PLACES)
MP4
SCREW
(14
PLACES)
J2
MOD
INPUT
FROM
W24
AND
A62
MOTHERBOARD
J14-
3.7GH2
OUTPUT
TO
W9 AND
A9
LOW
BAND
MODULATOR
J1
MP3
DONUT
RF1
SHIELD
(UNDER
COVER
PLATE)
MP7
NUT
(5
PLACES)
MP8
WASHER
(5
PLACES)
Figure
H-8. A8
3.7 GHz Oscillator
HP 8340B/41B
RF Path
Assembly-Level Troubleshooting
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