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Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual
B-31
Table B- 5: RZ Measurements - Timing (cont.)
Name Definition
RZ Delay The time interval between the crossings of the mid-reference levels on the two sources of the
measurement. The crossing times are computed as the mean of the histogram of the data slice
at the mid-reference level.
RZ Delay = Tcross(source1) – Tcross(source2)
Where Tcross is t he mean of the histogram of a positive or negative crossing at
mid-reference level. See RZ Crossings on page B--61.
The mid-reference level is adjustable and defaults to 50% of the RZ maximum pulse amplitude.
See Mid-reference level on page B--69.
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, for each source, the algorithm searches forward from
the Start Gate for the first rising or falling edge as defined by Slope, but the Direction of
traversal c an be reversed, so that t he search will be backward f rom t he Stop Gate. See To
Localize a Measurement on page 3--83.
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.
RZ +Duty Cycle The ratio of the RZ pulse width to the RZ bit t ime.
If the first crossing is positive, then:
If the first crossing is negative, then:
Where Tcross1, Tcross2 and Tcross3 are the mean of the histogram of the first three
consecutive crossings at the mi d-reference level.
The mid-reference level is adjustable and defaults to 50% of the RZ maximum pulse amplitude.
If enabled, measurement gates constrain the measurement region to the area between the Start
Gate (G1) and Stop Gate (G2).
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.
Duty Cycle =
(Tcross2 − Tcross1)
(Tcross3 − Tcross1)
Duty Cycle =
(Tcross3 − Tcross2)
(Tcross3 − Tcross1)