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ADDENDUM
691 INSTRUCTION MANUAL
ADDITIONAL TESTING
HOW TO GET AN AMPLIFI
DISPLAY OF MUlTIPATH
USING THE
I MODEL 691 FM MODULATION MONITOR/TEST SET
With the oscilloscope
in
the X-V mode, connect the horizontal input to the
composite output of
the
1.
Attach the
front panel Scope output.
Set the Output
ca
1
input to
691
ect switch
the Channel
B
position and select the AM
gnal-to-Noise position of the Display
ect
switch bank in the lower right-hand corner of
691.
Momentarily move
the Channel B Meter Sel
switch from
the
FCC position to
the AUTO
position
un
1
the
au
display shows
20 dB.
The instant 20 dB is shown, move
the Meter
ect
switch to the
HOLD
position.
The scope should now show
an
ampl
ifi
view
any multipath that is present.
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