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Modulation
⚫
After PM is enabled, the instrument will generate PM waveform with the currently
specified carrier and modulating waveforms. To avoid multiple waveform changes,
enable modulation after configuring the other modulation parameters.
8.4.2
Carrier Waveform Shape
PM 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.
⚫
Noise and DC could not be used as carrier waveform.
8.4.3
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] >
keypad or direction keys and knob to input the desired frequency value.
8.4.4
Modulation Source
Press [Mod] >
modulation source.
internal Source
When internal modulation source is selected, press
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.
external Source
When external modulation source is selected, the
modulation menu is grayed out and disabled. The instrument receives the external
modulation signal from the [FSK/Trig/Sync/Extmod] connector on the rear panel. At
this point, the PM modulation phase deviation is controlled by the ±4V signal level on
the connector.
HDG3000B User manual
42
Frequency
softkey on the front panel, and then use the numeric
SignalSrc
softkey to select Internal, External or Another Channel as the
Shape
softkey to select Sine,
Frequency
and
Shape
menu in the
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