Tektronix 500C Manual do Utilizador descarregar pdf (Página 302)

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

1 2 ... 297 298 299 300 301 302 303 304 305 306 307 ... 351 352

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Tektronix 500C Manual do Utilizador Página 302