Modulation EN ⚫ Noise and DC could not be used as carrier waveform. 8.3.3 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. 8.3.4 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. ⚫ 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 FM modulation frequency deviation is controlled by the ±4V signal level on the connector. another ch 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. HDG3000B User manual Copyright © Qingdao Hantek Electronics Co., LTD 40