HP 54501A Programming Reference Manual page 337

A
falling edge must
cross
the upper threshold in
a
negative direction,
cross
the mid threshold (any number of times), and then
cross
the lower
threshold without crossing the upper threshold.
Note
Most time measurements
are
made based on the
position of
the
first
crossing
of
the
middle
threshold.
AlQOrithrn
Following are the definitions that all measurements
are
based on:
Definitions
delay
There
are three
types
of delay measurement:
•
jitter
•
standard
•
user-defined
Jitter occurs only under the following circumstances:
•
standard/user-defined key
is set
to standard
•
two delay parameters are the
same
•
display mode
is
envelope
if
first
edge on
minimum waveform
is rising
then
delay
=
mid-threshold of first rising
edge
of max waveform minus
mid-threshold of first rising
edge on
min waveform
else
delay
=
mid-threshold of first falling edge on
min waveform
minus mid-threshold of first falling
edge on max
waveform
HP 54501A
Programming
Algorithms
A-3