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4.
BASIC OPERATION
IM FG410-01EN
4.7.9 Setting AM (DSB-SC)
The output amplitude varies according to the instantaneous value of the modulation signal.
This is AM without the carrier frequency component. DSB-SC stands for Double Side Band
−
Suppressed Carrier.
For the manipulation methods that are common with the modulation setting screen, refer to
pp. 70 and 72.
a) AM (DSB-SC) example
When the absolute value of the modulation signal amplitude is large, the amplitude of the
output signal is also large. When the value of the modulation signal is negative, the polarity
of the output signal is inverted.
b) Selecting AM (DSB-SC)
When [Mode] (oscillation mode) is set to
[Modulation] (modulation), set [Type]
(modulation type) on the 2nd page of the
setting screen to [AM(SC)] (AM (DSB-
SC)).
c) Waveforms for which AM (DSB-SC) is not possible
AM (DSB-SC) is not possible for DC.
d) Setting items required for AM (DSB-SC)
Set [Amptd] (carrier amplitude) on the 1st page of the setting screen.
Set [Depth] (modulation depth) on the 2nd page of the setting screen.
The output amplitude varies in the range of carrier amplitude setting value (Vp-p)
×
modulation depth (%) / 100.
When the modulation depth is 100%, the maximum output amplitude envelope value is
equal to the carrier amplitude setting value.
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
modulation depth results.
Modulation sync signal
(during internal modulation)
Modulation signal
Output signal
Amplitude setting value (Vp-p)
×
modulation depth (%) / 100
Select [AM(SC)] in
[Type] and then
press the ENTER
key
