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NOTE:
For
low
leve!
applications,
pull the
AMPL
knob
for -20 dB (10-to-1
reduction)
attenuation of the output
signal.
E. If
required,
pull and ad just the OFFSET knob
for a
DC
offset in
the output
signal
at the
OUTPUT
jack.
F.
Pull the
SWEEP WIDTH knob out to turn on the modulation.
G. Pull the MODULATION CARRIER knob out
for
FM modulation, otherwise leave it
pushed
in for AM
modulation.
H. For external modulation
of
the
carrier,
push the MOD button
in, or
leave it released to use
the internai 400Hz modulation
signal.
I.
Ad
just the MODULATION CARRIER knob
for
the desired modulation leve!.
5.8
Application
Note: Amplifier
Response
Testing
A typical
use
for the Mode! FG3B Sweep/Function Generator is
evaluating
the performance of
audio
power
arnplifiers.
Sweep testing an amplifier permits the user
to see at a glanee
the
overall
quality
of
the unit. Problems
such
as limited bandwidth or instability due to
comp<ment failure
become apparent
by
variations in
the
output leve!.
If the
amplifier
has
tone
con
trois,
sweep
testing will readily
show
their operation. The boost-
and-cut effects of treble and bass con trois
will appear as
peaks
and
dips in the output, respective!
y,
during
the
sweep.
Otherwise set
the tone
con
trois to the flat position during testing to avoid confusion.
17
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