
Service
Modes
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o
access
this
men
u,
press
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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)
T
oggles
the
sampler
correction
ON,
for
normal
op eration,
or
OFF,
for
diagnosis
or
adjustmen
t
purp oses.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF
GAIN
AUTO
Normal
op erating
condition
and
w
orks
in
conjunction
with
IF
GAIN
ON
and
OFF.
The
A10
assem
bly
includes
a
switchable
attenuator
section
and
an
amplier
that
amplies
low-lev
el
4
kHz
IF
signals
(for
A
and
B
inputs
only).
This
mo
de
allo ws
the
A10
IF
section
to
automatically
determine
ifthe
attenuator
should
b e
switched
in
or
out.
The
switch
o ccurs
when
the
A
or
B
input
signal
is
appro
ximately
030
dBm.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF
GAIN
ON
Lo c
ks
out
the
A10
IF
attenuator
sections
for
c
hec
king
the
A10
IF
gain
amplier
circuits,
regardless
of
the
amplitude
of
the
A
or
B
IF
signal.
Switches
out
b oth
the
A
and
B
attenuation
circuits;
they
cannot
b e
switched
indep enden
tly
.
Be
a
w
are
that
input
signal
lev
els
ab o
v
e
030
dBm
at
the
sampler
input
will
saturate
the
ADC
and
cause
measuremen
t
errors.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF
GAIN
OFF
Switches
in
b oth
of
the
A10
IF
attenuators
for
c
hec
king
the
A10
IF
gain
amplier
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
Allows
y
ou
to
store
the
correction
constan
ts
that
reside
in
non-v
olatile
memory
(EEPR
OM)
on
to
a
disk.
Correction
constan
ts
improv
e
instrumen
t
p erformance
b
y
comp ensating
for
sp ecic
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
bac
kup,
in
case
the
constan
ts
are
lost
(due
to
a
CPU
b oard
failure).
Without
a
disk
bac
kup
the
correction
constan
ts
can
b e
regenerated
man
ually
,
although
the
pro cedures
are
more
time
consuming.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SPUR
AVOID
ON
off
(SM8)
Osets
the
frequency
ofb oth
the
A3
YIG
oscillator
and
the
A3
ca
vity
oscillator
to
a
v
oid
spurs
whic
h
cannot
otherwise
b e
ltered
out.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SPUR
AVOID
OFF
allo
ws
examination
ofthese
spurs
f
or
service.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ANALOG
BUS
on
OFF
(ANAB)
Enables
and
disables
the
analog
bus,
describ ed
b elow.
Use
it
with
the
analog
in
men
u,
describ ed
in
the
following
pages:
DRAFT
3/21/106
15:14
Service
Key
Menus
and
Error
Messages
10-15
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com
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