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Appendix B: Algorithms
Appendices
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.
is defined in Positive Width, following.
If = 0 or undefined then return an error.
=
Positive Overshoot
Amplitude (voltage) measurement.
=
Note that this value should never be negative.
Positive Width
Timing measurement. The distance (time) between (default = 50%)
amplitude points of a positive pulse.
If = ‘+’
then
= –
else
= –
Rise Time
Timing measurement. Time taken for the leading edge of a pulse to rise from
a value (default = 10%) to a value (default = 90%).
Figure A-3 shows a rising edge with the two crossings necessary to calculate
a Rise Time measurement.
1. Searching from to , find the first sample in the measurement
zone less than .
2. From this sample, continue the search to find the first (positive) crossing
of . The time of this crossing is the low rise time or . (Use
linear interpolation if necessary.)