YOKOGAWA FG420 - Page 71

57
IM FG410-01EN
c) Amplituderangedeterminationmethod
Determine the amplitude range by observing how the waveform changes when the amplitude is
changed.
Under the initial settings, the waveform oscillating between the two polarities is set to ±FS, while the
unipolar waveform is set to 0/+FS.
 Examplewhenamplituderangeis±FSforsinewave
When the amplitude is changed, the waveform amplitude changes
in a +/– symmetric manner with the DC offset position as
reference.
Normally, in the case of a waveform that oscillates between the
two polarities with zero as the center, it is convenient to set the
amplitude range to ±FS.
 ExampleofGaussianpulsewithamplituderangeof0/+FS
When the amplitude is changed, only the waveform amplitude
is changed at the peak on the positive side, using the DC offset
position as reference. The amplitude is changed using the bottom
of the waveform as reference. Normally, in the case of a unipolar
waveform, it is convenient to set the amplitude range to 0/+FS or
-
FS/0.
If the amplitude range is set to
-
FS/0, the amplitude changes using
the top of the waveform as reference.
(Gaussian pulse is a waveform that is included in parameter-
variable waveforms.)
d) Limitationthroughamplituderange
• If the amplitude range is
-
FS/0 or 0/+FS, the maximum amplitude is one half of ±FS.
• If the amplitude range is
-
FS/0 or 0/+FS, this is equivalent to only the lower half or the upper
half of the waveform memory being used. Therefore, the amplitude resolution is reduced by 1 bit
compared to ±FS.
• The amplitude setting when the amplitude setting is ±FS is Vp-p, and in the case of
-
FS/0 or
0/+FS, it is Vpk. In either case, the amplitude refers to the peak-to-peak size of the waveform.
Amplitude change
DC offset
DC offset
0
0
Amplitude
change
4.4 Setting Methods for Main Items