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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

YOKOGAWA FG420 User Manual

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