Tektronix CSA8000B, TDS8000B CSA8000B & TDS8000B User Manual B-9

Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual B-9
Table B- 2: Pulse Measurements - Timing (cont.)
Name Definition
Delay The time interval between the crossings of the two mid-reference levels on the two sources of
the measurement.
Delay = Tcross(source1) –Tcross(source2)
Where Tcross is the first positive or negative crossing time at mid-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 first positive, the first negative, 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) of the 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. Direction 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 the period of the signal. The time intervals are determined at mid-reference level.
If Tcross1 is positive. then:
If Tcross1 is negative, 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)