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Model 8902A
Operation
COMMENTS
Input/Output Status
Accurate level measurements can be made only on cw signals. The MODULATION OUTPUT/AUDIO
INPUT is blanked during tuned
RF level measurements.
Measurement Limits
Relative measurements cannot be made on
RF
signals with absolute levels outside the range 0 to -127
dBm.
Valid Measurements Can Only Be Made on Tuned Signals
The Measuring Receiver must be tuned to the input frequency before valid tuned
F W
level measurements
can be made. The instrument
can
be manually
tuned
to the frequency of interest either before or after
the
TUNED RF
LEVEL Key is pressed. (Refer to RF Requency T h i n g on page
3-141.)
If the tuned frequency moves more than f 5 kHz from the frequency at which the power sensor reference
was taken, the instrument must be retuned.
Using Ratio with Tuned RF Level Measurements
For most measurement modes, when the Ratio feature is used, a known reference is first established
either by keying in the desired reference or by using the displayed measurement as the reference.
hrthermore, the established reference can always be recalled (using PREVIOUS RATIO or Special
Function
11.2).
In the Attenuator Measurement mode the initial
SET
REF reference cannot be recalled.
Also, when using the Ratio feature with T b e d
RF
Level, the input RF range recalibration data is
ignored.
CAUTION
Do not use 31.1
SPCL
when making any uncalibrated, or relative signal
level measurement in lbned RF Level mode without a power sensor.
The
Sensor Module must be used when making n n e d RF Level range-to-range
calibrations with the AVG Detector.
rev.25JUL87
3-117
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