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4.
BASIC OPERATION
IM FG410-01EN
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
pp. 70 and 72.
a) PSK example
Since the phase changes suddenly, the output signal waveform is non-continuous.
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].
Modulation sync signal
(during internal modulation)
Phase
deviation
addition
Phase
deviation
addition
Phase
deviation zero
Modulation signal
(during external modulation,
positive polarity)
Output signal
Select [PSK] in
[Type] and then
press the ENTER
key
