Waveform Measurements
Standard Waveform Denitions
Timing denitions
Once the edges and transition points have been dened, timing
measurements are made. Timing measurements are made on the rst rising
or falling edge on the display.
Rise time
Rise time = time at the upper threshold
0
time at the lower threshold on the
rst rising edge
Fall
time
F
all
time
=
time
at
the
lower
threshold
0
time
at
the
upper
threshold
on
the
rst
falling
edge
P
eriod
If
the
rst
edge
is
rising,
period
=
mid-threshold
crossing
of
second
rising
edge
0
mid-threshold
crossing
of
rst
rising
edge
Else
,
period
=
mid-threshold
crossing
of
second falling
edge
0
mid-threshold
crossing
of
rst
falling
edge
F
or
an
eye
measurement
period,
period
=
time
of
second
eye
crossing
0
time
of
rst
eye crossing
Frequency
Frequency = 1/period
7-17