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H
52382-900A
Vol.
1
Surveiilance
Signal source purity measurements
•
Commissioning communication systems
•
PCM
and FDM
system measurements
Measurements
on CW,
FM,
and
AM signals including
:
non-linear modulation
hum sidebands
spurious
FM on AM
carrier frequency
modulation frequency
deviation/modulation depth
•
Displaying
the
characteristics
of
active
and
passive networks
-
filters, amplifiers
etc*
3.
The instrument
is a
microprocessor controlled swept tuned analyser
of the
superheterodyne
type*
It
comprises
a
lower
unit (2382) containing
a
fre-
quency synthesizer
and swept receiver, and an
upper unit
(2380)
containing
the
display, digital processing and power supply*
The c*r*t.
has
a
viewing area
of
140
mm
x
1
10
mm.
A
minimum
of
multifunction
front panel controls have
been used
for
simplicity
and
ease
of
operation*
4,
The
display
is
scaled In both frequency and
amplitude
for
absolute
and
relative measurement
-
advanced circuit design, digital error correction
and
automatic
self
calibration give
a
reference level accuracy of
il
dB,
5*
For
optimum control
the
operator may
set the
reference frequency, span,
and
reference level using either
a
keypad or dedicated rotary controls*
Full
GPIB talk
and
listen facilities are also provided*
The display
6*
Two memory
stores designated
A and
B
record the display, and the content
of either or both stores
refreshes the
horizontally scanned
TV type raster.
The graticule, having
10 x 10
major divisions
and five vertical and horizontal
minor sub-divisions,
is
electronically generated
and the A and
B
traces can be
displayed against
this
background*
The two traces
A and B, and the
graticule,
have
separate
brightness controls
to
highlight one trace against
the other or
against
the
graticule lines*
In
addition each trace may
be
Infilled
or
outlined, according
to
user preference,
to
clarify
the
picture when
the signal
is
particularly complex.
All these ensure that
the
display
Is
clear and easy
to
Interpret
and
if
the
''Options^
board
is
fitted
it
can
be
shown
in
colour
on
an RGB video
monitor
by
coupling
this into
a
socket
at the
rear
of the 2380*
7.
The
A
and
B
traces have independently variable reference
levels and
vertical scales*
The levels relating
to
each are displayed
adjacent
to the
major graticule lines;
those for the A trace are on the left hand side
of
the
screen and those for the
B
trace on
the right
hand side.
Main control
settings
are
indicated
as
screen annotations not
only
for ease
of
operation
but
also
to
provide an unambiguous photographic record
if
required.
The
display can
be
protected from
being overwritten by using
the
"SAVE"'
mode.
Additional
information can
be
typed into
a
text area
at the
top
of
the screen
Chap
*
1
Page
4
July
85
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