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H 52382-900A
Vol.
1
24t
Tracking generator
«
The Integral tracking generator
produces
a
signal
whose frequency
precisely tracks
the
spectrum analyzer
tuning
in all scan
modes.
On full span
the
frequency range
is
therefore
100 Hz to 400 MHz,
accurate
to
within
tl
Hz of the tuned frequency*
25«
The
tracking generator can
be
used
to provide the sweeping signal for
measuring
the
response
of
a
filter or
crystal
etc*
Output level
Is
controllable
from -9*7
to
—20*3 dBm
in 0*1 dB steps and a
''normalize'^
feature
Is
provided
to
compensate
for
frequency response errors introduced
by the test
fixture, connecting leads and the analyzer Itself*
26*
Interaodulation products*
Normally,
in the
^auto"'
mode, the
r*f*
atten-
uator
Is
set to
give optimum dynamic range by maintaining
the
signal level
at
the
input
to the
first
mixer such
that
internally generated Intermodulation
or
distortion
products, produced by the non-linear behaviour
of the
input mixer,
do not
appear greater than the noise level*
When
the r»f*
attenuator
is
con-
trolled manually however overloading can occur and distortion products can
be
produced*
27.
A
simple key
operation (INTMD
IDENT)
identifies these products quickly
and easily
thereby giving Increased confidence
in
measurements.
If
the
amplitude
of
some
of the
displayed
peaks changes when
the
key
Is
operated
these
are the
Intermodulation
or
distortion
products.
If
amplitudes
do not
change there
is no
distortion present*
28,
Overload protection*
The
maximum Input signal
level
which can
be
applied
without fear
of
damage
is
+27 dBm (0*5
W)
but the instrument
Is
protected
against accidental application of overload power up
to
+47 dBm
(50
W)
by
means
of
a
latching relay which operates even
If
the Instrument
is
turned off.
An
indication
that an
overload
has
occurred
is
given
by the
word
''OVERLOAD^'
appearing on
che
screen and, if the
'"OPTIONS"'
board
is
fitted, an audible
sound being emitted from
a
beeper.
Providing
the
overload
is
no longer pre-
sent the latching relay can be reset by pressing a
specific key on the front
panel.
More detail
29,
Complete information
on all the features of the 2382, some of which are
listed below, are
In
Chap*
3,
Front panel control functions.
Max hold
Incremental keys
Trace exchange
Trace arithmetic
The pen plot option
Meter mode
Identify refresh
Secret key
July
85
Chap,
1
Page
7
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