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5.Advanced User Guidebook
51
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 (Max-Vtop)/Vamp, useful for square and pulse
waveforms.
Preshoot: Defined as (Min-Vbase)/Vamp, useful for square and pulse waveforms.
Mean: The arithmetic mean over the entire waveform.
RMS: The true Root Mean Square voltage over the entire waveform.
The automatic measurement of time parameters
The TDS series oscilloscopes provide time parameters auto-measurements
include Frequency, Period, Rise Time, Fall Time, +Width, -Width, +Duty, -Duty,
Delay , Delay , Delay , Delay .
Figure 5-9 shows a pulse with some of the time measurement points.
Rise Time
Fall Time
+Width
-Width
Figure 5-9
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.
+Width: The width of the first positive pulse in 50% amplitude points.
-Width: The width of the first negative pulse in the 50% amplitude points.
Delay
and
Delay
: The delay between the two channels at the
rising edge.
Delay
and
Delay
: The delay between the two channels at the
falling edge.
+Duty: +Duty Cycle, defined as +Width/Period.
-Duty:-Duty Cycle, defined as -Width/Period.
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