Modulation
EN
HDG3000B User manual Copyright © Qingdao Hantek Electronics Co., LTD
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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.
⚫ 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 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 AM modulation amplitude is controlled by the ±4V signal level on this
connector. For example, when the modulation depth is 100%, the output amplitude is
maximum when the external modulation signal is +4V, and the output amplitude is the
minimum when the external modulation signal is -4V.
Other Channels
CH1 and CH2 can be used as modulation sources reciprocally. When CH1 is used as
the modulated wave, CH2 can be used as the modulation source. And vice versa. When
selecting another channel as the modulation source, please turn on the output of that
channel.
8.1.5 Modulation Frequency
When internal modulation source is selected, press [Mod] > Frequency softkey to set
the frequency of the modulating waveform.
Use the numeric keypad or direction keys and knob to enter the desired frequency
values.
The modulating waveform frequency range is 2mHz to 1MHz, and the default value is
100Hz.
Note: This menu will be grayed out and disabled when other modulation sources
except the internal modulation source are selected.
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