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4.Advanced User Guidebook
89
over the entire waveform.
Min: The minimum amplitude. The most negative peak voltage measured
over the entire waveform.
Vtop: Voltage of the waveform's flat top, useful for square/pulse waveforms.
Vbase: Voltage of the waveform's flat base, useful for square/pulse
waveforms.
Vamp: Voltage between Vtop and Vbase of a waveform.
OverShoot: Defined as (Vmax-Vtop)/Vamp, useful for square and pulse
waveforms.
PreShoot: Defined as (Vmin-Vbase)/Vamp, useful for square and pulse
waveforms.
Cycle RMS: The true Root Mean Square voltage over the first entire period
of the waveform.
Cursor RMS: The true Root Mean Square voltage over the range of two
cursors.
The automatic measurement of time parameters
The oscilloscopes provide time parameters auto-measurements include
Period, Frequency, Rise Time, Fall Time, +D width, -D width, +Duty, -Duty,
Delay A→B , Delay A→B , Screen Duty , Phase A→B
,
and Phase
A→B .
Figure 4-25 shows a pulse with some of the time measurement points.
Figure 4-25
Rise Time: Time that the leading edge of the first pulse in the waveform
takes to rise from 10% to 90% of its amplitude.
Fall Time: Time that the falling edge of the first pulse in the waveform
takes to fall from 90% to 10% of its amplitude.
+D width: The width of the first positive pulse in 50% amplitude points.
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