HP 8753D - Page 130

3. T
o activate
the frequency
oset mode
, press:
4
SYSTEM
5
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INSTRUMENT
MODE
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FREQ
OFFS
MENU
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FREQ
OFFS
ON
Since
the
LO
(oset)
frequency
is
still
set
to
the
default
value
of
0Hz,
the analyzer
will
operate
normally
.
4.
Measure
the
output
power
in
the
R-channel
by
pressing:
4
MEAS
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INPUT
PORTS
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R
Observe
the
13
to
16
dB
oset
in measured
power.
The actual
input power
level
to
the
R-channel
input
must
be
0
dBm
or
less
,
0 10
dBm typical,
to
avoid
receiver
saturation
eects
.
The
minimum
signal
level
must
be
greater
than
0
35
dBm
to
provide
sucient signal
for
operation
of
the
phaselock
loop
.
5.
You
cannot trust
R channel
power
settings
without
knowing
about
the
oset
involved.
P
erform a
receiver calibration
to remove
any power
osets
by
pressing:
4
CAL
5
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RECEIVER
CAL
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TAKE
RCVR
CAL SWEEP
Once
completed,
the
R-channel
should
display
0
dBm.
Changing
power
ranges
will
require
a
recalibration
of
the
R-channel.
Making Mixer Measurements 3-5