YOKOGAWA FG420, Руководство пользователя

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85 IM FG410-01EN
4.7.10 Setting DC offset modulation
DC offset 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) DC offset modulation example
DC offset of the output signal grows larger when the modulation signal swings to the positive side.
DC offset setting ± peak DC offset deviation
0V
Modulation sync signal
(during internal modulation)
Output signal
Modulation signal
b) Selecting DC offset modulation
When [Mode] (oscillation mode) is set
to [Modulation] (modulation), set [Type]
(modulation type) on the 2nd page
of the setting screen to [OFSM] (DC
offset modulation).
c) Waveforms for which DC offset modulation is not possible
None. DC offset modulation is possible for all waveforms.
d) Setting items required for DC offset modulation
Set [Offset] (carrier DC offset) on the 1st page of the setting screen.
Set [Deviation] (peak DC offset deviation) on the 2nd page of the setting screen.
The output DC offset varies in the range of carrier DC offset setting ± peak DC offset 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 DC offset
deviation results.
Select [OFSM] in
[Type] and then
press the ENTER
key.
4.7 Modulation Setting and Manipulation