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Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual
B-11
Table B- 2: Pulse Measurements - Timing (cont.)
Name Definition
Period The time interval between t wo consecutive crossings on the same slope of the signal at the
mid-reference level.
Period = Tcross3 – Tcross1
Where Tcross3 and Tcross1 are the t imes of the f irst t wo consecut ive crossings on the
same slope at the mid-reference level.
The mid-reference level is adjustable and defaults to 50% of the pulse amplitude.
If enabled, measurement gates constrain the measurement region to the area between the Start
Gate (G1) and Stop Gate (G2). See To Localize a Measurement on page 3--83.
See Measurement Reference Parameters and Methods on page B--56 or in the online help and
also see Reference Levels Method on page 3--79.
Phase
Where:
H Tcross1 of source1 is the time of the first crossing of either polarity on source 1.
H Tcross3 of source1 is the time of the next crossing on source 1of the same polarity as
Tcross1.
H Tcross1 of source2 is the time of the first crossing of either polarity on source 2 after
Tcross1 of source1
H All Tcrossings are at the mi d-reference levels, which are adj ustable and def ault to 50%
of the pulse ampl itude.
If measurem ent gates are enabled, the measurement region is constrained between the Start
Gate (G1) and Stop Gat e (G2) of t he sources.
Phase =
Tcross1 of source2 − Tcross1 of source1
Tcross3 of source1 − Tcross1 of source1
⋅ 360
Pk-Pk Jitter The delta between t he minimum and maximum of time crossings of data sampled at the at the
mid-reference level.
Pk-Pk Jitter = Tcrosspp
Where Tcrosspp is the diff erence between the maxi mum crossing t ime and the minimum
crossing time for a hi stogram of t he Tcross val ues. Tcross is t he horizont al coordinate of
the first positive or negative crossing.
The mid-reference level is adjustable and defaults to 50% of the pulse amplitude.
The slope can be selected to be the fi rst posi tive, the fi rst negat ive, or the first crossing (positive
or negative) in the region.
If enabled, measurement gates constrain the measurement region to the area between the Start
Gate (G1) and Stop Gate (G2). By default, the algorithm searches forward from the Start Gate
for the f irst speci fied edge, but the Direction of traversal can be reversed, so that the search will
be backward from the Stop Gate.
This measurement requires the use of a waveform database. When this measurement is turned
on, it will automat ically set the measurement system to use a waveform database if available.
See Use a Waveform Database on page B--70.