4.7 Modulation Setting and Manipulation
81
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
pp. 70 and 72.
a) DC offset modulation example
DC offset of the output signal grows larger when the modulation signal swings to the
positive side.
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.
Modulation sync signal
(during internal modulation)
Modulation signal
Output signal
DC offset setting
± peak DC offset deviation
0V
Select [OFSM] in
[Type] and then
press the ENTER
key
