HP 8340b User Manual

SHIFT
M4
(HP-IB:
SHM4)
SHIFT
M4
activates
32
service
diagnostic
routines
that
test
some
of the DACs
and much
of the
control
circuits on
the
A27
level
control,
A28 SYTM
driver,
A57
marker
bandcross,
and
ASS
sweep
generator
assemblies.
This
diagnostic
also
allows the results
of the
self
test,
run
at
power on
and
after
instru¬
ment
preset,
to
be displayed
in
the
front
panel
ENTRY DISPLAY.
The
DAC
tests
are
not
exhaustive
(a
small
error
does
not
generate
a
failure
indication),
but
if
a
test
fails,
the
indication
should direct
you
to
a
specific
device
or
circuit
path.
While
the
tests
are
running,
the
DIAGNOSTIC
TEST
IN
PROGRESS
appears
in
the
front panel
ENTRY
DISPLAY.
When
the
tests
finish,
TEST:?
FULL
DIAGNOSTIC
and then
PASS
or
FAIL
appear.
Pass
indicates
that
all
tests
related
to
this
diagnostic
passed.
Fail
indicates
that
one
or
more
tests
failed.
See
the
controller section
functional
group
for
details
on
the
SHIFT M4
diagnostics.
SHIFT
M5 (HP-IB: SHM5)
SHIFT M5
turns
off
any
of
the
above
diagnostic
routines,
and
restores
the
displays
to their
previous
condition.
SHIFT
RF
(HP-IB:
SHRF)
SHIFT
RF
disables the
ALC
(automatic
leveling
control)
to
allow direct
control
of the
linear
modulator
circuit.
When
SHIFT
RF
is
engaged,
there
is
no
limit
on
the
minimum
pulse
repetition
frequency
1.
Press
[SHIFT]
[RF]
POWER
SEARCH:X.XXdB
appears
in
the
entry
display
(X.XX
is
the
last-entered
value).
2.
Place
the
instrument
in
CW,
or
in
pulse modulation
mode
with
pulses
wider
than
2
(AS.
3.
Using
the
step
keys,
the
data
entry
keyboard,
or
the
front panel
knob,
set
the
desired
power
level.
The
POWER
dBm
display
shows
the
actual
power
when
the
instrument
is in
the
CW
or
pulse
modulation
mode.
SHIFT
RF
can
also
be
used
as
a
diagnostic function
of
the
ALC
circuits.
SHIFT
METER
(HP-IB:
SHA3)
This
function
bypasses
the
ALC
to allow direct
control
of
the
linear
modulator
circuit.
In
this
mode,
there
is
no
limit
on
the
minimum
pulse
repetition
frequency.
1.
Press
[SHIFT]
[METER].
ATN:
X-xx
dB,
MOD;
x.x
dB
appears
in
the
ENTRY DISPLAY
(x is
the
last-entered
value).
2.
Place the
instrument
in
CW,
or
in
pulse
modulation
mode
with
pulses wider
than
2
ps.
HP 8340B/41B
Assembly-Level
Service
Front
Panel
Diagnostics
A-29

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English