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Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual
B-9
Table B- 2: Pulse Measurements - Timing (cont.)
Name Definition
Delay The time interval bet ween the crossings of the two mi d-reference levels on the two sources of
the measurement .
Delay = Tcross(source1) – Tcross(source2)
Where Tcross is t he first posi tive or negati v e crossing time at m id-reference level. See
Pulse Crossings and Mid-reference Level on page B--58.
The mid-reference levels are adjustable and default 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 Gat e (G2) of t he two sources. By default, searching is forward from the
Start Gate for each source, but can be reversed, so that searching is backward from the Stop
Gate. Direct ion can be controlled independently for the two waveform sources. See To Localize
a Measurement on page 3--83.
+Duty Cycle The ratio (expressed as a percentage) of the first positive pulse width within the measurement
region to t he period of the signal. The time intervals are determined at mid-reference level.
If Tcross1 is posi tive. then:
If Tcross1 is negat ive, then:
Tcross1, Tcross2 and Tcross3 are the times of the first three consecutive crossings at the
mid-reference level.
The mid-reference levels are adjustable and default 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 Measurement Reference Parameters and Methods on page B--56 or in the online help.
+ Duty Cycle = 100 ×
(Tcross2 − Tcross1)
(Tcross3 − Tcross1)
+ Duty Cycle = 100 ×
(Tcross3 − Tcross2)
(Tcross3 − Tcross1)