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Model 8902A
Performance
Tests
6. Resweep 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 R F Power Measurement:
-23 dB
Sensor Module's Thru-Path
SWR
7. On the Measuring Receiver, press
FREQ.
Key in 1.6 SPCL and 1.0 MHz to set the input
attenuation to 50 dB (range 1) and manual tune the instrument.
NOTE
In the steps that
jollow, ignorc error mtwages in fhc Measwing Receiver's display. Thp
messages indicate that the ins,rurnenr
is
not tirned to the
inpiil
signal. Also ignow
any
spirrioiis
signals on the spwtrirm analyzer display. Thc signals originale with the
Measuring Rmivcr S local oscillator.
8. If necessary, re-establish the reference on the spectrum analyzer (with the sensor module
disconnected
from
the
SWR
bridge). Then with the sensor module connected to
the
SWR
bridge, resweep the signal generator. At all frequencies between 2.5 and 1300 MHz, the signal
should be 17 dB below the reference signal.
Worst Case Return Loss for Tuned RF Level Measurement;
External Sensor Module; Range 1:
-17 dB
9. On the Measuring Receiver, key in
1.2
SPCL to set the input attenuation t o
10 dB (range
2).
Repeat step 8.
Worst Case Return
Loss for
'Tuned R F Level Measurement;
External Sensor Module; Range 2:
-17 dB
10. Set the signal generator level to -27 dBm.
11.
With the sensor module disconnected from the SWR bridge, sweep the signal generator as
before and establish a convenient reference on the spectrum analyzer's display.
12. Reconnect the sensor module
to
the SWR bridge. On the Measuring Receiver, key in 1.7 SPCL
to set the input gain to
24
dB.
Resweep the signal generator. At all fiequencies between 2.5 and
1300
MHz, the signal should be
14 dB below the reference signal.
Worst Case Return Loss for Tuned R F Level Measurement;
13. On the Measuring Receiver, key in 1.8 SPCL to set the input gain to 14 dB. Resweep the signal
generator. At all frequencies between 2.5 and 1300 MHz, the signal should be 17
dB
below the
reference signal.
External Sensor Module: Range 3:
-14 dB
Worst Case Return Loss for Tuned RF Level Measurement;
External Sensor; 14 dB Gain Range:
-17 dB
rcv. I8DEC86
4-33
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