HP 8901B Operation And Calibration Manual page 373

Performance Tests Model
8901B
NOTE
The log display accuracy of the spectrum analyzer may be inadequate for
this test. I f 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. I f 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