YOKOGAWA FG420, User Manual

Page: 90 / 180

76 IM FG410-01EN
4. BASIC OPERATION
4.7.3 Common modulation settings and manipulations
This subsection describes the settings and manipulations that are common to all types of modulation.
a) To set the oscillation mode to modulation → Oscillation mode setting
On the Oscillator setting screen,
set [Mode] (oscillation mode) to
[Modulation]. This changes the mode
to the modulated oscillation mode.
In the modulated oscillation mode, the
setting screen consists of two pages,
which can be toggled with the
NEXT
NEXT key.
b) To select the modulation type → Modulation type setting
The following eight modulation types can be selected in [Type] (modulation type) on the 2nd page of
the setting screen.
FM[FM]

p.79
FSK[FSK]

p.80
PM[PM]

p.81
PSK[PSK]

p.82
AM[AM]

p.83
AM(DSB-SC)[AM(SC)]

p.84
DC offset modulation [OFSM]

p.85
PWM[PWM]

p.86
c) To set the carrier condition
Set the various parameters of the carrier signal on the 1st page of the setting screen.
d) To set the modulation width
The modulation width setting is done on the 2nd page of the setting screen. The item name that is
displayed is either [Deviation], [Depth], or [HopFreq], depending on the modulation type.
For details, refer to the description of each modulation type.
e) To perform modulation with the internal signal source
Set [Source] (modulation source) on the 2nd page of the setting screen to [Int] (internal).
[ModFctn] (internal modulation waveform) and [ModFreq] (internal modulation frequency) must also
be set.
[ModFctn] (internal modulation waveform) can be selected from the following seven choices.
• Sine [Sine]
• Square (50% duty) [Square]
• Triangle (50% symmetry) [Triangle]
• Rising ramp [UpRamp]
• Falling ramp [DnRamp]
• Noise [Noise]
• Arbitrary [ARB]
Select [Modulation]
in [Mode] and then
press the ENTER
key.
Modulation type