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84 IM FG410-01EN
4. BASIC OPERATION
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 p.74
and p.76 .
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.
Amplitude setting value (Vp-p) × modulation depth (%) / 100
Modulation sync signal
(during internal modulation)
Output signal
Modulation signal
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) x 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.
Select [AM (SC)] in
[Type] and then
press the ENTER
key