Press
FI,
"carrier," and use the knob or keypad to prograrn the frequency
of
the carrier.
Carrier frequency can be prograrnrned between 0.01
Hz
and
40
MHz.
The
carrier will
always be a sine wave.
Press
F2,
"mod
freq,"
and
use
the
knob
or
keypad
to
enter
the
frequency
of
the
modulating signal. Modulation frequency can
be
prograrnrned between 0.01
Hz
and
40
MHz.
NOTE
When the carrier frequency to modulation frequency ratio
exceeds:
65535/2.5
or
26,214:1
the Model 395 gives an error message.
Press
F3,
"mod
signal,"
and
use
the
knob
or
keypad
to
step
through
the
listing
of
modulation waveforms. The list includcs all wnveforms except pulse, pulse-train, signal
plus noise, signal plus comb, comb, analog and digital noise. Note: these waveforms can
be
copied into an Arb waveform using "create from copy."
Press FS, "next," to retum to the
AM
Setup screen. Or, press F4, "exit,"
to
retum to the
Standard
Wavefonn
screen.
To
generate
the
AM
or
SCM
waveform,
select
"am"
from the
Standard
Waveform
screen.
Frequency
Key
-
pressing
the
Frequency
key
while
the
AM
waveform
is
running
displays:
AM FREQUENCY
sample: 32.87
MHz
(carrier: 1.003 MHz)
(mod freq: 1.003 kHz)
This sereen displays the sarnple clockused to construct the
AM
wavefonn.
The
screen
also displays the carrier and modulation frequencies.
By
changing the sarnple frequency
you
can
alter the carrier and modulation frequencies.
The
Model
395 creates the
AM
and
SCM
wavefonns
by
generating
an
integer multiple
of
cycles (i.e. bath the carrier and modulation wavefonns
end
at the zero crossing point).
In
order for the Model 395 to generate these
integer
multiples,
it
sometimes becomes
necessary
to alter
one
of
the
frequencies -
the
software
algorithm
in
the
Model
395
chooses
to
alter the carrier frequency.
ThUS,
the
carrier frequency
may
be
slightly
off
from the prograrnrned carrier frequency. Therefore, change the sample frequency
and
note the change
in
the carrier and modulation frequencies. This is a trial and error method
of
changing the carrier frequency.
4'-64
Front Panel Operation Reference
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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