Calibrate
.
Notice
that
the
output
power
of
the
tracking
generator
is
not
perfectly
at,
as
previously
shown
in
Figure
3-21.
This
is
due
in
part
to
the
frequency
response
error
,
inherent
in
all
scalar
network
measurement
systems
.
Normalization
is
a
technique
used
to
eliminate
frequency
response
errors
,
thereby
increasing
the
amplitude
accuracy
of
the
measurement.
Before
normalizing,
a
reference
trace
must
be
taken.
F
or
transmission
measurements
,
this
reference
trace
is
referred
to
as
a
\thru,"
because
the
reference
trace
is
measured
with
the
DUT
removed
from
the
system.
F
or
reection
measurements
,
an
open/short
average
is
used.
Because
you
are
making
a
transmission
measurement,
a
thru-reference
trace
must
be
stored.
T
o
store
the
thru
trace:
11.
Remove
the
DUT
,
replacing
it
with
a
barrel
connector
for
optimum
measurement
integrity
.
Connect
the
thru,
as
shown
in
Figure
3-28.
Figure
3-28.
Thru
Connected
for
Calibration
Routine
12.
Store
the
thru
trace
in
trace
B
by
pressing
4
TRACE
5
NNNNNNNNNNNNNNNNNNNNNNN
TRACE
B
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CLR-WRT
B
.
W
ait
for
the
new
speed
to
nish,
then
NNNNNNNNNNNNNNNNNNNN
VIEW
B
.
13.
F
or
future
reference
,
store
the
thru
trace
in
a
trace
register
.
Press
4
SA
VE
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SAVE
TRACE
B
NNNNNNNNNNNNNNNNNNNNNNN
TRACE
n
(where
n
is
the
number
of
the
trace
register
.)
3-26
Operation
HP
85640A
RF
T
racking
Generator
Operation
and
Service
Manual
Summary of Contents for 85640A
Page 2: ...HP 85640A RF Tracking Generator Operation and Service Manual ABCDE Printed in USA ...
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