YOKOGAWA FG420, Руководство пользователя

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82 IM FG410-01EN
4. BASIC OPERATION
4.7.7 Setting PSK
This is binary phase shift modulation by which the output phase is offset according to the modulation
signal.
For the manipulation methods that are common with the modulation setting screen, refer to p.74
and p.76 .
a) PSK example
Since the phase changes suddenly, the output signal waveform is non-continuous.
Phase
deviation
addition
Phase
deviation zero
Modulation sync signal
(during internal modulation)
Output signal
Modulation signal
(during external modulation,
positive polarity)
Phase
deviation
addition
b) Selecting PSK
When [Mode] (oscillation mode) is set
to [Modulation], set [Type] (modulation
type) on the 2nd page of the setting
screen to [PSK] (PSK).
c) Waveforms for which PSK is not possible
PSK is not possible for noise and DC.
d) Setting items required for PSK
Set [Deviation] (phase deviation) on the 2nd page of the setting screen.
The phase deviation zero state and the specified phase deviation state alternate for the output.
Note that the phase does not vary in the ± phase deviation range.
If [Source] (modulation source) is set to [Int] (internal), set [ModFreq] (modulation frequency).
If [Source] (modulation source) is [Ext] (external), set the trigger polarity and input the modulation
signal (TTL level) to the external trigger input terminal. If the polarity is set to [High] (positive), the
phase deviation is zero during low-level input, and the specified phase deviation is output during
high-level input, and vice versa if the polarity is set to [Low].
Select [PSK] in
[Type] and then
press the ENTER
key