NF WAVE FACTORY WF1967, Instruction Manual (Operations

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4.7 Setting and Operation of Modulation
WF1967/WF1968
4-70
4.7.11 Setting PWM
The duty of the square wave and the pulse wave is changed depending on instantaneous value of the
modulation signal.
For the modulation setting screen and the common operation method, please refer to P.4-55, P.4-58
a) Example of PWM
When the modulating signal swings to a positive side, the duty of the output signal increases.
b) To select PWM
c) Waveform or mode where PWM is unavailable
PWM can be processed only to the square wave and the pulse wave.
PWM is not available for other waveforms.
Duty sweep cannot be performed with PWM.
d) Setting items necessary for PWM
Set the carrier duty [Duty] on the first page of the setting screen.
Set the peak duty deviation [Deviation] on the second page of the setting page.
The output duty is changed within the range of carrier duty ± peak duty deviation.
When the pulse-wave is used, the pulse width of the carrier is fixed to the duty setting and cannot be
set with time.
When the modulation source [Source] is internal [Int], set the modulation waveform [ModFctn],
modulation frequency [ModFreq], and modulation phase [ModPhs]. Internal [Int] cannot be
selected during sweep oscillation mode.
When the modulation source [Source] is external [Ext], enter the modulating signal to the external
modulation/addition input terminal. It reaches the specified peak duty deviation at ±1V input.
Select [PWM] in the modulation type setting menu
Set the modulation type [ModType] to PWM
[PWM] on the second page of the setting screen
when the oscillation mode [Mode] is set to
modulation [MODU] and on the third page of
the setting screen when the mode is burst
[BURST] or sweep [SWEEP].
Modulation sync signal
(during internal modulation)
Modulation signal
Output signal