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Performance
Check
Procedure
-
4g4Ll4g4Ap
Servlce
Vol.
1
PRELIMINARY
PREPARATION
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4-4
lnitial
Power-Up
During
initial
power-up
cycle,
the instrument
type,
instrument
operating
system
processor
firmware
ver_
sion,
and
the front
panel
processor
firmware
versions
are
displayed
on
the crt
for
approximately
two seconds.
The
Replacement
Parts
List
in
the
Serviie
manual,
lists
the ROMs
used
for
each version.
The
service
manual
also
lists
the firmware
operating
notes
associated
with
each
firmware
version.
lf
the
microcomputer
detects
a
hardware
failure.
a
failure
report
will come
on
screen
and
remain
for about
2 seconds.
A
status
message
will
then
appear
and
remain
for
the
duration
of
the
failure.
press
<Blue_
SHIFT>
MAX
HOLD
to bring
eror
messages
to
the
screen.
a.
Connect
the
spectrum
analyzer power
cord
to an
appropriate power
source
(refer
to
power
Source and
Power
Requirements
in
Section
g,
Installation).
Set
TIME/DIV
to AUTO
and switch
pOWER
on.
b. When
POWER
is
sivitched
oR,
the
pOWER
indi-
cator
(a green
LED)
should come
on.
c.
The
microprocessor
runs
a
memory
and
UO
t€st.
lf no
processor
system
problems
are
found,
the
power-
up
program
will
complete
in
approximately
10 seconds,
and
the instrument
wilt
be ready
to operite.
After
the
power-up
routine,
the
crt
will
initiatize
as
shown
in Fig-
ure 4-'l
.
d. The
operating
functions and modes should
initial-
ize
to
th€
following
state:
Readout
REF
LEVEL
CENTER FRECIUENCY
MARKER
FREQUENCY
sPAN/DrV
VERT
DISPLAY
RF ATTEN
FREO RANGE
REF
OSC
RESOLUTION
BANDWIDTH
TRIGGERING
AUTO RESOLN
DIGITAL
STORAGE
MIN
NOISE
All
other
pushbuttons
On
ODBM
0.90GHZ
0.00GHz
MAX
10DB/
2ODB
0-1.8a
t-ub
3MHZ
FREE RUN
On
VIEWA&VIEWBon
On
lnactive or off
e.
Set the
MIN
RF ATTEN
dB
controt
to 0
(NORM)
and
th€ PEAK/AVERAGE control
fully
counterclockwise.
set
the
TlMEiDlv control
to
AuTo, REF
LEVEL
to
read
-20DBM,
and adjust
th€
INTENSITY control
for
the
desired
brightness.
Note
that the
RF ATTEN
readout
is
now
0DB.
f.
Apply the
CAL OUT
signal to
the RF INPUT
through
a
50O
cable
and a N-TO-BNC adapter.
g,
A dot
marker
will appear
in the upper
portion
of
the screen in
the
MAX
frequency mode. This
marker
indicates
the
location
on
the display to
which
the spec-
trum analyzer frequency
is
tuned,
With a
frequency
readout
of 0.00GH2,
the marker will be
in
the
upper left
portion
of the
screen.
Rotate
the
CENTER/MARKER
FREQUENCY control
and note that the dot
marker
moves
across the
display. Notice that the
oENTER
FREOUENCY readout
(top
line) remains
at
0.90GH2,
and
that the
MARKER
FREOUENCY
readout
(second
line)
changes
according
to the
position
of
the
marker
(dot).
h.
Harmonics
of
the
100
MHz
calibrator
signal
will
be displayed
as shown
in Figure 4-2.
To
select 100
MHz
center frequency,
press
the
pushbutton
sequence
of <Blue-SHIFT>
FREO'100
MHz.
i.
To
change
the SPAN/DIV
to
100
MHz,
press
the
pushbutton
sequence
of
<Blue-SHIFT>
SPAN/DIV 100
MHz. The
dot
marker is now
horizontally
centered,
and
the 100 MHz
calibrator
signal is at
center screen.
aGHz
btntEnNeL
UNLOCK:
Most lrequency
measurements
will not be
accurate
unlil
after this
readout
has
changed
to
lNT.
rE a.SlC
TI
a
-tt
-n
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Figure
4-1.
Grt
disptay
at initial
power-up.