Tektronix TDS 684A, TDS 744A, TDS 784A Negative Width, Peak to Peak Period Phase

Appendix B: Algorithms
TDS 684A, TDS 744A, & TDS 784A User Manual B–9
Note that this value should never be negative (unless High or Low are set
out-of-range).
Timing measurement. The distance (time) between  (default = 50%)
amplitude points of a negative pulse.
If  = ‘–’
then
 =  – 
else
 =  – 
Amplitude measurement. The absolute difference between the maximum and
minimum amplitude.
 =  – 
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:
Negative Width
Peak to Peak
Period
Phase