Tektronix TDS 500C, TDS 600B, TDS 700C Period Phase

Appendix B: Algorithms
B–12 TDS 500C, TDS 600B, & TDS 700C User Manual
Timing measurement. Time taken for one complete signal cycle. The reciprocal
of frequency. Measured in seconds.
 =  – 
Timing measurement. The amount of phase shift, expressed in degrees of the
target waveform cycle, between the  crossings of two different wave-
forms. Waveforms measured should be of the same frequency or one waveform
should be a harmonic of the other.
Phase is a dual waveform measurement; that is, it is measured from a target
waveform to a reference waveform. To get a specific phase measurement, you
must specify the target and reference sources.
Phase is determined in the following manner:
1. The first  and third )in the
source (target) waveform are found.
2. The period of the target waveform is calculated (see Period above).
3. The first  in the reference waveform crossing
in the same direction (polarity) as that found for the target
waveform is found.
4. The phase is determined by the following:
 =  *
 
If the target waveform leads the reference waveform, phase is positive; if it lags,
negative.
Phase is not available in the Snapshot display.
Period
Phase