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I
Model 8902A
RF
Level
FUNCTIONS
Special Function
35
( R F Level)
DESCRIPTION
Operation
T h e R F Level function enables the Measuring Receiver to meastire and display the peak, R F power.
R F level measurements are initiated with Special Function
35 o r
with the R F POWER key when
there is n o sensor at the Measuring Receiver's SENSOR input.
R F level measurements are not calibrated, so they are not as accurate as measurements made with
a n external power sensor as with R F Power measurements. (Refer to
RF
Power on page
3-75.)
PROCEDURE
To make a broadband R F power measurement with an R F cable connected from the signal source
to
R F INPUT (rather than a power sensor connection), select R F POWER.
To make the measurement with the power sensor connected, key in 35.0 SPCL.
HP-IB PROGRAM CODES
LIN
=
L N
LOG
=
LG
R F POWER
=
M4
SPCL
=
SP
MEASUREMENT TECHNIQUE
T h e broadband
RF
power at R F INPUT is detected by an R F peak detector. The output of the
detector is measured and displayed.
When RF Level is selected,
the
Measuring Receiver
sets
its R F input attenuation to 50 dB
to
minimize
SWR. Any manual setting of R F input attenuation/gain (Special Function 1) is overridden.
3-89
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