Appendix C: Algorithms
Appendices
AĆ34
If the target waveform leads the reference waveform, phase is positive; if it
lags, negative.
Phase is not available in the Snapshot display.
Positive Duty Cycle
Timing measurement. The ratio of the positive pulse width to the signal peri-
od, expressed as a percentage.
PositiveWidth
is defined in Positive Width, following.
If
Period
= 0 or undefined then return an error.
PositiveDutyCycle
=
PositiveWidth
Period
100%
Positive Overshoot
Amplitude (voltage) measurement.
PositiveOvershoot
=
Max * High
Amplitude
100%
Note that this value should never be negative.
Positive Width
Timing measurement. The distance (time) between
MidRef
(default = 50%)
amplitude points of a positive pulse.
If
MCross1Polarity
= ‘+’
then
PositiveWidth
=
(MCross2
–
MCross1)
else
PositiveWidth
=
(MCross3
–
MCross2)
Rise Time
Timing measurement. Time taken for the leading edge of a pulse to rise from
a
LowRef
value (default = 10%) to a
HighRef
value (default = 90%).
Figure A-3 shows a rising edge with the two crossings necessary to calculate
a Rise Time measurement.
1.
Searching from
Start
to
End
, find the first sample in the measurement
zone less than
LowRef
.
2.
From this sample, continue the search to find the first (positive) crossing
of
LowRef
. The time of this crossing is the low rise time or
TLR
. (Use
linear interpolation if necessary.)
Содержание TDS 620
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