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5.Advanced User Guidebook
The automatic measurement of voltage parameters
The SDS series oscilloscopes provide automatic voltage measurements including
Vpp, Vmax, Vmin, Vavg, Vamp, Vrms, Vtop, Vbase, Overshoot and Preshoot,
Cycle rms, Cursor rms. Figure 5-53 below shows a pulse with some of the voltage
measurement points.
Figure 5-68
Vpp: Peak-to-Peak Voltage.
Vmax: The maximum amplitude. The most positive peak voltage measured over
the entire waveform.
Vmin: The minimum amplitude. The most negative peak voltage measured over
the entire waveform.
Vamp: Voltage between Vtop and Vbase of a 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.
Overshoot: Defined as (Vmax-Vtop)/Vamp, useful for square and pulse
waveforms.
Preshoot: Defined as (Vmin-Vbase)/Vamp, useful for square and pulse
waveforms.
Average: The arithmetic mean over the entire waveform.
Vrms: The true Root Mean Square voltage over the entire waveform.
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 rang of two cursors
The automatic measurement of time parameters
The SDS series oscilloscopes provide time parameters auto-measurements
include Frequency, Period, Rise Time, Fall Time, +Width, -Width, Delay 1→2 ,
Delay 1→2 , +Duty and –Duty, Duty cycle.
72
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