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Using the Oscilloscope
The Scope Auto Measure Menu
Preshoot and Overshoot . Preshoot and Overshoot measure the
perturbation on a waveform above or below the top and base voltages
(see the "Top and Base Voltages" section earlier in this chapter). These
measurements use all data displayed on the screen; therefore, it is very
important that only the data of interest be displayed. If you want to
measure preshoot and overshoot on one edge of a waveform, then only
display that edge. If you want to measure the maximum preshoot and
overshoot on a waveform, then display several cycles of the waveform.
Preshoot is a perturbation before a rising or a falling edge and is
measured as a percentage of the top-base voltage.
Overshoot is a perturbation after a rising or a falling edge and it is
measured as a percentage of the top-base voltage.
If the measured edge is rising, then
(
Preshoot =
-----------------------------------------------
and,
(
Overshoot=
--------------------------------------------- -
If the measured edge is falling, then
(
V
Preshoot=
--------------------------------------------- -
and,
(
Overshoot=
-----------------------------------------------
194
)
V
–
V
base
minimum
(
)
V
–
V
top
base
)
V
–
V
maximum
top
(
)
V
–
V
top
base
)
–
V
maximum
top
(
)
V
–
V
top
base
)
V
–
V
base
minimum
(
)
V
–
V
top
base
×
100
×
100
×
100
×
100
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Table of Contents
Troubleshooting
