Teledyne LeCroy WaveStation 3000 Operators Manual - Manual (Page 24)

WaveStation 3000 Function and Arbitrary Waveform Generator
Generating an FSK Modulated Waveform
Frequency Shift Keying modulation is an output frequency that switches from the carrier waveform and hop
preset frequencies at a specific point. The specific frequency point where the output switches is the Key
Frequency. The Key Frequency is determined by the internal frequency generator or the signal voltage level
from the Trig/Gate/Fsk/Burst connector on the Back Panel.
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
carrier 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 FSK softkey.
4. Set the following FSK parameters:
l
Modulation Source - Internal or External. If External is selected, attach the modulation source to
theModulation In connector on the Back Panel.
l
Key Freq - the frequency at which the output frequency shifts between the carrier amplitude and
the hop frequency. The internal source frequency range is 1 mHz to 1 MHz. You do not need to set
Key Freq if using an external modulation source.
l
Hop Freq - the desired hop frequency level (for variation from the set carrier waveform frequency).
5. Press the appropriate channel Output button to begin outputting the waveform.
Generating an ASK Modulated Waveform
Amplitude Shift Keying modulation represents digital data as variations in the amplitude of a carrier wave.
The amplitude of an analog carrier signal varies in accordance with the bit stream (modulating signal),
keeping frequency and phase constant.
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
carrier 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 ASK softkey.
4. Set the following ASK parameters:
l
Modulation Source - Internal or External. If External is selected, attach the modulation source to
the Trig/Gate/FSK/Burst connector on the Back Panel. You do not need to set any other param-
eters.
l
Key Freq - the frequency at which the output amplitude shifts between the carrier amplitude and 0.
The internal source frequency range is 2 MHz to 50 kHz.
5. Press the appropriate channel Output button to begin outputting the waveform.
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