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GENERAL
INFORMATION
Product
Description
The 494A
and
the
494Ap
(programmabte)
instru_
ments
are
high performance,
compict,
portable
spec-
trum
analyzers.
Microcomputer
control
of
most
func-
tions simplifies
and
enhances
operation.
The
analyzers
feature:
.
single
and
delta
marker
modes
o
synthesizer
freguency
accuracy
o
precision
signal
counting
r
precise
amplitude
measurement
o
digitat
storage
disptay
o
internal
memory
for
front-panel
settings
and
displays
o
help
and
diagnostic
crt
messages
.
keypad
entry
and
menu
selections
r
ability
to
ptot
the
disptay.
readout,
and graticule
o
ability
to
hold
g
personalized
macros
in
memory
o
10
Hz
to
3
MHz
resolution
o
multiband
sweep
capability
,
The
frequency
range
is
10kHz
to
21
GHz with
the
internal
mixer,
extending
up
to
925
GHz
with
ext€rnal
waveguide
mixers.
Resolution
bandwidth
is 10
Hz
to
3
MHz.
Digital
storage provides
flicker-free
displays
plus
functions
to
compare
and
subtract
displays,
anO
save
maximum
values.
In
addition,
up
to nine
separate
displays
with
their
readouts
can
be
stored
in
battery-
powered
non-volatile
memory,
then later
recalled
for
additional
analysis
and
comparison.
Up
to
ten
different
front-panel
control
setups
can
also
be
stored
for future
recall.
The
signal
counting
f€ature
allows
the spectrum
analyzer-to
selectively
count
a
particular
signal out
of
several
that may
be
present
at
its
input.
Select center
frequency
either
by
the front-panel
tuning knob
or
by
the Data
Entry
keypad.
When
using
the
keypad,
it
is
not
necessary
to
alter
the
Span/Dii
setting
regardless
of
the frequency
selected.
oiher
parameters,
such
as
vertical
display
and reference
level,
are
also
keypad
selectable.
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Sedon
1
-
4g4[l494Ap
Servlce,
Vol.
1
Marker
functions provide
direct
readout
of
fre-
quency
and
amplitude
at
any
point
along
any
displayed
trace.
Relative
(delta)
frequency
and
amplitude
informa-
tion-
betwe€n
any
two
points
along
any
displayed
trace
is
also
available.
The
tuning knob
moves
ihe-markers,
and
it can
also
move
the
display
with
a
stationary
fre-
quency
marker.
lt is
possible
to fix
the
marker
to a
position
on
the display
and
use
th€
knob
to move
both
the
spectrum
and
the
marker at
the
same
time.
Refer
to
using
the Markers
Feature
in
section
6
of
the
opera_
tors
Manual.
The
programmable
(p)
version
of
the instrument
adds
remote
control
capabilities
to the
manual
instru_
ment
features.
The
front-panel
controls
(except
those
intended
exclusively
for
local
use, such
ai lrufLruSlW1
can
be
remotely
operated
through
the
GplB
port.
Thia
allows
the spectrum
analyzer
to b€
used
with a
variety
of
systems
and
controllers.
Refer
to the
programmers
Manual
for additional
information.
The
programmable
instrument
also
adds
the
macroinstructions
(macros)
feature.
The,nstrument
memory
has
8K
bytes
set aside
for
the
construction
of
made-to-order
macros.
The
macro
menu
can
hold
the
titles
of eight
macros
for
easy access.
Specific
macro
information
is located
in
the
programmers
Manuat.
Conformance
to fndustry
Standards
This
spectrum
analyzer
complies
with
the following
Industry
Safety
Standards
and
Regulatory
Require-
ments:
Safety
csA
-
Electrlcal
Bulletin
FM
-
Electricat
Utitization
Standard
Ctass 3g20
ANSI
C39.5
-
Safety Requirements
for
Etectrical
and
Electronic
Measuring
and
Controlling Instru-
mentation.
IEC
348
(2nd
edlton)
-
Safety
Requirements
for
Electronic
Measuring
Apparatus,
Regulatory
VDE
0871
Class
B Regutations
for RFI
Suppression of
High
Frequency
Apparatus and
Installations.
Product
Service
To
assure adequate product
service and
mainte-
nance
for our instruments,
Tektronix
has established
Field
Offices and
Service
Centers at strategic
points
1-1