Hantek HDG3000B Series, Руководство пользователя

Страница: 64 / 102

Modulation
EN
HDG3000B User manual Copyright © Qingdao Hantek Electronics Co., LTD
48
8.7.4 Modulation Source
Press [Mod] > SignalSrc to select Internal or External modulation source.
internal Source
When internal modulation source is selected, the modulating waveform is set as a
Square with 50% duty cycle, and the rate at which the output phase "shifts" between
"carrier phase" and "modulation phase" is determined by "PSK Rate".
external source
When external modulation source is selected, the generator receives the external
modulating signal from the [FSK/Trig/Sync/Extmod] connector on the rear panel.
Note: The [FSK/Trig/Sync/Extmod] connector is different when controlling PSK and
AM/FM/PM modulations externally.
8.7.5 PSK Rate
When internal modulation source is selected, press [Mod] > Rate softkey to set the rate
at which the output phase shifts between "carrier phase" and "modulation phase".
⚫
Use the numeric keypad or direction keys and knob to input the desired rate value.
⚫
The rate range is from 2mHz to 1MHz and the default is 100Hz.
Note: This menu will be grayed out and disabled when the external modulation
source is selected.
8.7.6 Modulation Phase
Press [Mod] > Phase softkey to set the modulation phase.
⚫
Use the numeric keypad or direction keys and knob to input the desired phase
value.
⚫
The phase range is from 0º to 360º and the default is 180º.
8.8 BPSK Modulation
Users can configure the instrument to "shift" its output phase between two preset values
using BPSK modulation. The rate at which the output shifts between the two phases
(called the "carrier phase" and the "modulation phase") is determined by the internal
signal level of the instrument.