Modulation EN 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. 8.2.4 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 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. 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. 8.2.5 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 HDG3000B User manual Copyright © Qingdao Hantek Electronics Co., LTD 38