Note
If
SA
VE
LOCK
is
on,
pressing
NNNNNNNNNNNNNNNNNNNNNNN
TRACE
n
on
an
HP
8561A/62A
causes
the
message
SAVELOCK
ON
to
appear
in
the
active
function
area.
If
this
happens
,
press
4
SA
VE
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SAVELOCK
OFF
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SAVE
TRACE
B
NNNNNNNNNNNNNNNNNNNNNNN
TRACE
n
.
Normalize
.
11.
Reconnect
the
DUT
.
12.
T
o
normalize
,
activate
the
trace
math
function
A
0
B
+
DL
!
A,
by
pressing
4
TRACE
5
NNNNNNNNNNNNNN
MORE
.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
A 0B+DL ! A
ON
OFF
until
ON
is
selected.
13.
If
necessary
,
make
adjustments
to
the
position
of
the
trace
by
changing
the
position
of
the
display
line
.
A
ccess
the
display
line
by
pressing
4
DISPLA
Y
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DSPL
LIN
ON
OFF
.
The
preset
value
of
the
display
line
is
0
dBm.
Measure
.
14.
Read
the
return
loss
by
activating
the
marker
.
Press
PEAK
SEARCH
4
ON
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MARKER
DELTA
,
then
use
the
analyzer's
adjustment
knob
to
position
the
marker
at
the
frequency
of
interest
(typically
the
point
of
maximum
return
loss).
See
Figure
3-45.
Figure
3-45.
Return
Loss
Reading
Using
the
4
MKR
5
Function
3-40
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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