Waveform Generator 16
Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide 213
To set up Frequency Modulation (FM)
In the Waveform Generator Modulation Menu (under [Wave Gen] > Settings >
Modulation):
1 Press the Ty pe softkey and turn the Entry knob to select Frequency
Modulation (FM).
2 Press the Waveform softkey and turn the Entry knob to select the shape
of the modulating signal:
• Sine
• Square
• Ramp
• Sine Cardinal
• Exponential Rise
• Exponential Fall
When the Ramp shape is selected, a Symmetry softkey appears so that
you can specify the amount of time per cycle that the ramp waveform is
rising.
3 Press the FM Freq softkey and turn the Entry knob to specify the
frequency of the modulating signal.
4 Press the FM Dev softkey and turn the Entry knob to specify the
frequency deviation from the original carrier signal frequency.
When the modulating signal is at its maximum amplitude, the output
frequency is the carrier signal frequency plus the deviation amount, and
when the modulating signal is at its minimum amplitude, the output
frequency is the carrier signal frequency minus the deviation amount.
The frequency deviation cannot be greater than the original carrier
signal frequency.
Also, the sum of the original carrier signal frequency and the frequency
deviation must be less than or equal to the maximum frequency for the
selected waveform generator function plus 100 kHz.
The following screen shows an FM modulation of a 100 kHz sine wave
carrier signal.
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