Note
Tracking
errors
occur
when
the
tracking
generator's
output
frequency
does
not
exactly
match
the
input
frequency
of
the
spectrum
analyzer
.
The
resulting
product
from
the
spectrum
analyzer's
input
mixer
is
not
at
the
center
of
the
IF
bandwidth.
The
degradation
in
tracking
causes
a
decrease
of
the
displayed
amplitude
,
as
shown
in
Figure
3-27.
Because
a
small
error
in
tracking
causes
a
larger
change
in
amplitude
,
tracking
errors
are
most
noticeable
in
narrow
resolution
bandwidths
.
Use
the
TRA
CKING
ADJUST
vernier
knob
on
the
HP
85640A
to
compensate
for
tracking
errors
.
A
djust
the
knob
until
the
displayed
signal
increases
to
its
maximum
amplitude
.
Figure
3-27.
Tracking
Error
HP
85640A
RF
T
racking
Generator
Operation
and
Service
Manual
Operation
3-25
Summary of Contents for 85640A
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