Performance Tests Model
8901B
NOTE
The
log
display accuracy of the spectrum analyzer
may
be inadequate for
this test. If any data points
in
the following procedure appear to be near
or
out of limits, check the amplitude calibration of the spectrum analyzer
as
described
in
its manual and use the data obtained there to correct the
results
in
this procedure.
If a tracking generator that
is
compatible with the
RF
spectrum analyzer
is
substituted for the signal generator, a swept measurement can be made.
Procedure
1.
Connect the equipment
as
shown in Figure
4-7.
Connect the
6
dB
attenuator directly
to
the RF
input of the SWR bridge.
Do
not connect anything
to
the device-under-test input of the SWR
bridge
at
this time.
2.
Set the signal generator level
to
+3
dBm CW.
3.
Set the spectrum analyzer
to
sweep
0
to
1
GHz.
Set the display for
10
dB
per vertical division.
4.
With the sensor module disconnected from the SWR bridge, tune the
signal
generator from
0.1
to
1300
MHz and note the level
of
the signal. Adjust the spectrum analyzer’s reference level,
as
needed,
to
set the average level of the signal
to
a
convenient graticule reference. Re-sweep the
signal generator and note the reference on the display.
NOTE
If the signal generator
or
spectrum analyzer
is
incapable of complete
coverage of the frequency range, use whatever range
is
available. If
the
spectrum analyzer
has
variable persistence
or
storage capability, use
it
to
store the reference line.
5.
On the Modulation Analyzer, press the blue key then press INSTR PRESET (the AUTOMATIC
OPERATION key)
to
preset the instrument. Press RF POWER. Connect the sensor module
to
the
SWR
bridge. (See Figure
4-7.)
6.
Re-sweep the signal generator and observe the level of the signal on the spectrum analyzer.
At
all
frequencies between
2.5
and
1300
MHz the signal should be
23
dB
below the reference signal.
(Repeat the above steps and adjust the spectrum analyzer sweep,
as
required,
to
gather
data
for
the highest and lowest frequencies.)
Worst Case Return
Loss
for RF Power Measurement:
-23
dB
4-32
Performance Test
9
rev.
IOJUL87
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