Tektronix CSA8000B - Manual (Page 294)

Appendix B: Automatic Measurements Reference
B- 32 CSA8000B & TDS8000B User Manual
Table B- 5: RZ Measurements - Timing (cont.)
Name Definition
RZ Eye Width The 3 σ guarded delta between the rising and falling edge crossings.
Eye Width = (Tcross2 – 3 * Tcross2 σ) – (Tcross1 + 3 * Tcross1σ)
Where Tcross1 and Tcross2 are the mean of the histogram of the two crossings. 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 automatically set the measurement system to use a waveform database if available.
See Use a Waveform Database on page B--70.
RZ Fall Time RZ Fall Time characterizes the negative slope of the RZ pulse by computing the time interval
between the mean crossings of the high reference level and the low reference level.
RZ Fall Time = TcrossL -- TcrossH
Where:
H TcrossLRZFig_RefLevels>Second is the mean of the histogram of the crossing of the
low reference level
H TcrossH is the mean of the histogram of the crossing of the high reference level. See
RZ Measurement Reference Levels on page B--60.
The adjustable low reference and high reference levels default to 20% and 80% 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 automatically set the measurement system to use a waveform database if available.