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Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual
B-29
Return-to-Zero (RZ) Measurements - Timing
Table B--5 topic describes each RZ measurement in the timing category. S ee
Table B--4 on page B--15 for amplitude category measurements; see Table B--6
on page B--36 for area category measurements.
Table B- 5: RZ Measurements - Timing
Name Definition
RZ Bit Rate The inverse of the time interval between two consecutive rising or falling edges (i.e. the
reciprocal of the Bi t Time). The crossing times are computed as the mean of the histogram of
the data slice at the mid-reference level. The choice of rising or falling edge is automatic based
on the f irst sl ope encount ered in the measurement region.
Where Tcross3 and Tcross1 are the mean of t he histogram of t he two consecut ive
crossings on the same t ype slope at the 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.
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.
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 Bit R ate =
1
(Tcross3 − Tcross1)
RZ Bit Time The time interval between two consecutive rising or falling edges. The crossing t imes are
computed as the mean of the histogram of the data slice at the mid-reference level. The choice
of rising or falling edge is automatic based on the first slope encountered in the measurement
region.
RZ Bit Time = Tcross3 – Tcross1
Where Tcross3 and Tcross1 are the mean of t he histogram of t he two consecut ive
crossings on the same t ype slope at the mid-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.