HP 8753D Option 011 - Page 254

Service
Modes More
Menu
To
access this
men
u,
press
4
SYSTEM
5
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SERVICE MENU
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SERVICE MODES
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MORE .
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SAMPLER
COR
ON
off
(SM6)
Toggles
the sampler
correction ON,
for normal
operation,
or OFF,
for
diagnosis or
adjustment
purp
oses.
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IF GAIN
AUTO
Normal
op
erating
condition
and
w
orks
in
conjunction
with
IF
GAIN
ON
and
OFF.
The
A10 assem
bly includes
a switc
hable
attenuator
section and
an
amplier
that
amplies
lo
w-lev
el
4
kHz
IF
signals
(for
A
and
B
inputs
only).
This
mo
de
allo
ws the
A10
IF
section
to
automatically determine
if the
attenuator
should b
e
switched
in
or
out.
The
switc
h
o
ccurs
when
the
A
or
B
input
signal
is
appro
ximately
0
30
dBm.
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IF
GAIN
ON
Lo
c
ks
out the
A10 IF
attenuator
sections
for
c
hec
king
the
A10
IF
gain amplier
circuits,
regardless
of
the
amplitude
of
the
A
or
B
IF
signal.
Switc
hes
out
b
oth
the
A
and
B
atten
uation circuits;
they
cannot
b
e
switc
hed
indep
enden
tly.
Be
a
w
are
that
input
signal
lev
els
abo
ve
0 30
dBm
at
the
sampler
input
will
saturate
the
ADC
and
cause
measuremen
t
errors.
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IF
GAIN
OFF
Switc
hes
in
b
oth
of
the
A10
IF
atten
uators
for
c
hec
king
the A10
IF
gain
amplier
circuits.
Small
input
signals
will
app
ear
noisy
,
and
raise the
apparen
t
noise
o
or
of
the
instrumen
t.
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SPUR
TEST
on
OFF
(SM7)
F
or
factory
use
only
.
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STORE
EEPR
on
OFF
Allo
ws
y
ou
to
store
the
correction
constan
ts
that
reside
in
non-v
olatile
memory
(EEPR
OM)
on
to
a
disk.
Correction
constan
ts
impro
v
e
instrumen
tp
erformance b
y
comp
ensating
for
sp
ecic
op
erating
v
ariations
due
to
hardw
are
limitations
(refer
to
the
\Adjustmen
ts"
c
hapter).
Ha
ving
this
information
on
disk
is
useful
as a
backup,
in case
the
constan
ts
are
lost
(due
to
a
CPU
b
oard
failure).
Without
a
disk
bac
kup
the
correction constan
ts can
be
regenerated
man
ually
,
although
the
pro cedures
are more
time
consuming.
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SPUR
AVOID
ON
off
(SM8)
Osets
the frequency
of b
oth the
A3
YIG
oscillator
and
the
A3
cavity oscillator to a
void spurs whic
h cannot otherwise be ltered
out.
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SPUR AVOID OFF
allows examination of these spurs for
service.
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ANALOG BUS on OFF
(ANAB)
Enables and disables the analog bus, describ
ed b elo
w. Use it with
the analog in men
u, describ ed in the follo
wing pages:
DRAFT
3/21/106 15:14
Service Key Menus and Error Messages 10-15
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