HP 8753D - Page 96

14.
To
set the
CW frequency
before going
into the
power
sweep
mode
,
press:
4
SEQ
5
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SPECIAL FUNCTIONS
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MARKER !
CW
15.
Press 4
MENU
5
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SWEEP TYPE
MENU
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POWER SWEEP
.
16. Enter
the
start
and
stop
power
levels
for
the
sweep
.
Now
channel
1
is
displaying
a
gain
compression
curve
.
(Do
not pay
attention to
channel 2
at
this
time
.)
17.
T
o
maintain
the
calibration
for
the
CW
frequency
,
press:
4
CAL
5
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INTERPOL
ON
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CORRECTION
ON
18.
Press
4
CHAN
2
5
4
DISPLA
Y
5
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DUAL
CHANNEL
ON
.
19.
If
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N
D2/D1
to
D2
ON
was selected,
press
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MORE
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D2/D1
to
D2
OFF
.
20.
Press 4
MEAS
5
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INPUT PORTS
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B .
Now
channel
2
displays
absolute
output
power
(in
dBm)
as
a
function
of
power
input.
21.
Press
4
SCALE REF
5
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SCALE/DIV
4
10
5
4
x1
5
to
change
the
scale
of
channel
2
to
10
dB
per
division.
22.
Press 4
CHAN
1
5
4
1
5
4
x1
5
to change
the
scale
of
channel
1
to
1
dB
per
division.
Note
A
receiver
calibration
will
improve
the
accuracy
of
this
measurement.
Refer
to
Chapter
5,
\Optimizing
Measurement
Results
."
23.
Press
4
MARKER
F
CTN
5
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MARKER
MODE
MENU
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MARKERS:COUPLED
.
24.
T
o
nd
the
1
dB
compression
point
on
channel
1
,
press:
4
MARKER
F
CTN
5
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MKR
SEARCH
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SEARCH:MAX
4
MARKER
5
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MKR ZERO
4
MARKER
F
CTN
5
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MKR
SEARCH
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SEARCH:TARGET
4
0
1
5
4
2
1
5
Notice
that
the
marker
on
channel
2
tracked
the
marker
on channel
1.
25.
Press
4
CHAN
2
5
4
MARKER
5
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MKR
MODE
MENU
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MARKERS:UNCOUPLED
.
26. T
o
take
the
channel
2
marker
out
of
the
1
mode
so that
it reads
the absolute
output power
of the amplier (in dBm), press:
4
MARKER
5
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NNNNNNNNNNNNNNNNNN
1MODE MENU
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NNNNNNNNNNNNNNNN
1 MODE OFF
Making Measurements 2-47