Modulation
EN
HDG3000B User manual Copyright © Qingdao Hantek Electronics Co., LTD
42
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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
.
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Press
[Wave]
button on the front panel to select the desired carrier waveform.
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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] >
Frequency
softkey on the front panel, and then use the numeric
keypad or direction keys and knob to input the desired frequency value.
8.4.4 Modulation Source
Press
[Mod] >
SignalSrc
softkey to select Internal, External or Another Channel as the
modulation source.
internal Source
When internal modulation source is selected, press
Shape
softkey to select Sine,
Square, Ramp, Noise or Arb as the modulation source. The default is Sine.
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Sine
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Square: 50% duty cycle
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Ramp: 50% symmetry.
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Noise
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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
Frequency
and
Shape
menu in 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.
Summary of Contents for HDG3000B Series
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