YOKOGAWA FG420, Руководство пользователя

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81 IM FG410-01EN
4.7.6 Setting PM
The output phase varies according to the instantaneous value of the modulation signal.
For the manipulation methods that are common with the modulation setting screen, refer to p.74
and p.76 .
a) PM example
Phase shifting of the output signal grows larger when the modulation signal swings to the positive
side.
Since the phase changes along with time, the instantaneous frequency also changes simultaneously.
Modulation sync signal
(during internal modulation)
Output signal
Modulation signal
b) Selecting PM
When [Mode] (oscillation mode) is set
to [Modulation], set [Type] (modulation
type) on the 2nd page of the setting
screen to [PM] (PM).
c) Waveforms for which FM is not possible
PM is not possible for noise and DC.
d) Setting items required for PM
Set [Deviation] (peak phase deviation) on the 2nd page of the setting screen.
The output phase changes in the range of ± peak phase deviation.
If [Source] (modulation source) is set to [Int] (internal), set [ModFctn] (modulation waveform) and
[ModFreq] (modulation frequency).
If [Source] (modulation source) is set to [Ext] (external), input the modulation signal to the external
modulation/addition input terminal. In the case of ±1 V input, the prescribed peak frequency
deviation results.
Select [PM] in
[Type] and then
press the ENTER
key.
4.7 Modulation Setting and Manipulation