Teledyne LeCroy WaveStation 3000 Operators Manual - Manual (Page 23)

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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