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5.1 AMModulation
A modulated waveform consists of a carrier waveform and a modulating waveform. In AM, the
carrier amplitude is varied by the voltage level of the modulating waveform.
5.1.1 Select AM Modulation
Press [Mod] >Type > AMsoftkey to enable AM function.
When Mod is enabled, Sweep or Burst will be disabled automatically.
After AM is enabled, the instrument will generate AM waveform with the currently specified
carrier and modulating waveforms. To avoid multiple waveform changes, enable modulation
after configuring the other modulation parameters.
5.1.2 Carrier Waveform Shape
AM carrier shape: Sine (default), Square, Ramp, Pulse, Arbitrary (except DC) or Harmonic
waveform.
Press[Wave] button on the front panel to select the desired carrier waveform shape.
Noise and DC could not be used as carrier waveform.
5.1.3 Carrier Waveform Frequency
For different carrier waveforms, the settable range of carrier frequency is different.Please refer to
"Frequency Characteristics" in "
Specifications".The default value is 1kHz.
Press [Setting]>Frequencysoftkey on the front panel, and then use the numeric keypad or
direction keys and knob to input the desired frequency value.
5.1.4 Modulation Source
Press [Mod]>Signal Sourcesoftkey to select Internal, External or Another Channel as the
modulation source.
Internal Source
When internal modulation source is selected, pressShapesoftkey to select Sine, Square, Ramp,
Noise or Arb as the modulation source. The default is Sine.
Sine
Square: 50% duty cycle
Ramp: 50% symmetry.
Noise
Arb: Sinc, Exp Fall, Haver Sine, Lorentz, Gause, Dual Tone, ECG.
Note: Noise can be used as modulating waveform but cannot be used as carrier waveform.
User Manual 34
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