Operator's Manual
Generating an FM Modulated Waveform
1.
Generate a carrier wave
of type Sine, Square, Ramp, or Arb(itrary).
2. Before outputting, press the Front Panel
Mod
function button. You should see "Mod" appear next to the car-
rier wave type on the Channel tab, and the modulation parameter menu and value list on the display.
3. Press the
Type
softkey, then press the
FM
softkey.
4. Set the following FM parameters:
l
Modulation
Source
-
Internal
or
External
. If External is selected, attach the modulation source to the
Modulation In
connector on the Back Panel.
l
FM Freq
- modulating waveform frequency. The internal source frequency range is 2 MHz to 20 kHz.
You do not need to set FM Freq if using an external modulation source.
l
FM Dev
- maximum frequency deviation. The frequency deviation value should be ≤ the carrier wave-
form frequency. The sum of the deviation and the carrier waveform frequency should be ≤ the max-
imum frequency of the selected waveform. When using an external source, the deviation is
controlled by the voltage level of the connector attached to
Modulation In
on the Back Panel: +10 V
corresponds to the selected deviation, and -10 V to the negative selected deviation. So, a ±10 V input
results in an output FM deviation equal to the preset FM deviation.
5. Press the appropriate channel
Output
button to begin outputting the waveform.
Generating a PM Modulated Waveform
Modulated waveforms are one part carrier waveform; the other modulated. In Phase Modulation, the phase of
the carrier waveform varies with the instantaneous voltage level of the modulated waveform.
1.
Generate a carrier wave
of type Sine, Square, Ramp, or Arb(itrary).
2. Before outputting, press the Front Panel
Mod
function button. You should see "Mod" appear next to the car-
rier wave type on the Channel tab, and the modulation parameter menu and value list on the display.
3. Press the
Type
softkey, then press the
PM
softkey.
4. Set the following PM parameters:
l
Modulation
Source
-
Internal
or
External
. If External is selected, attach the modulation source to the
Modulation In connector on the Back Panel.
l
PM Freq
- sets the frequency at which the output amplitude shifts between the carrier amplitude and
0. The internal source frequency range is 1 MHz to 50 kHz.You do not need to set PM Freq if using an
external modulation source.
l
Phase Dev
- sets the maximum phase deviation. Values range from 0° to 360°.
5. Press the appropriate channel
Output
button to begin outputting the waveform.
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