YOKOGAWA FG420, User Manual

Page: 97 / 180

83 IM FG410-01EN
4.7.8 Setting AM
The output amplitude changes according to the instantaneous value of the modulation signal.
For the manipulation methods that are common with the modulation setting screen, refer top.74
and p.76 .
a) AM example
The amplitude of the output signal grows larger when the modulation signal swings to the positive
side.
Modulation sync signal
(during internal modulation)
Output signal
Modulation signal
Amplitude setting value (Vp-p) / 2 x
(1 + modulation depth (%) / 100)
Amplitude setting value (Vp-p) / 2 x
(1 – modulation depth (%) / 100)
b) Selecting AM
When [Mode] (oscillation mode) is set
to [Modulation] (modulation), set [Type]
(modulation type) on the 2nd page of
the setting screen to [AM] (AM).
c) Waveforms for which AM is not possible
AM is not possible for DC.
d) Setting items required for AM
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) / 2 x (1 ±
modulation depth (%) / 100).
When the modulation depth is 0% or the modulation is stopped, the output amplitude is 1/2 of that
during continuous oscillation.
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] in
[Type] and then
press the ENTER
key
4.7 Modulation Setting and Manipulation