Algorithms
Hysteresis
- The hysteresis band is 10% of the waveform amplitude.
It is used in.
MCrossl, MCross'2,
and
M G
t o s s
3
calculation.
For example, once a crossing has been measured in negative direc
tion, the waveform data must fall below 10% of the amplitude from
the
MidRef
point before the measurement system is armed and ready
for a positive crossing. Similarly, after a positive Midhe/crossing,
waveform data must go above 10% of the amplitude before a nega
tive crossing can be measured. Hysteresis is useful when you are
measuring noisy signals, because it allows the digitizing oscillo
scope to ignore minor fluctuations in the signal.
MCross Calculations
MCrossl, MCross2, and MCross3
- refer to the first, second, and
third
MidRef
cross times, respectively. See figure D-l.
The polarity of the crossings does not matter for these variables, but
the crossings alternate in polarity; that is,
MCrossl
could be a posi
tive or negative crossing, but if
MCrossl
is a positive crossing,
MCross2
will be a negative crossing.
The oscilloscope calculates these values as follows:
1. Find the first
MidRefCrossing
in the waveform, record or the
gated region. This is
MCrossl
.
2. Continuing from
MCrossl.,
find the next
MidRefCrossing
in the
waveform record (or the gated region) of the opposite polarity of
MCrossl.
This is
MCross2.
3. Continuing from
MCross2
, find the next
MidRefCrossing
in the
waveform record (or the gated region of the same polarity as
MCrossl
. This is
MCross3.
MCrossl Polarity
- is the polarity of the first crossing (no default). It
can be rising or falling.
StartCycle
- is the starting time for cycle measurements. It is a
number with values between 0 and
(RecordLength -
1), inclusive,
StartCycle
=
MCrossl
EndCycle
- is the ending time for cycle measurements. It is a number
with values between 0 and
(RecordLength -
1), inclusive.
EndCycle = MCross 3
D - 2
Appendix D: Algorithms
Summary of Contents for 2216
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