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Appendix B: Automatic Measurements Reference
B-34
CSA8000B & TDS8000B User Manual
Table B- 5: RZ Measurements - Timing (cont.)
Name Definition
RZ Pulse Symmetry RZ Pulse Symmetry measures to what extent the RZ pulse is symmetrical around the peak at
the mid-reference level. The pulse peak i s t he center of the int erval , sized to Eye Aperture,
which yields the maximum mean vertical val ue. See RZ Eye-Aperture Parameters on page
B--62.
Where:
H Tcross1 and Tcross2RZFig_CrossLevels>Second are the time crossings of the RZ
pulse of the mid-reference level. See RZ Crossings on page B--61.
H Tcross0 is the time coordinate of the pulse peak.
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 gat ing is enabl ed, the measurement region is constrained 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 Pulse Symmetry [%] = 100 ×
Ꮛ
(Tcross0 − Tcross1)
(Tcross2 − Tcross1)
Ꮠ
RZ Rise Time RZ Rise Time characterizes the positive slope of the RZ pulse by computing the time interval
between the mean crossings of the low reference level and the high reference level.
RZ Rise Time = TcrossH -- HcrossL
Where:
H TcrossH is the mean of the histogram of the crossing of the high reference level
H TcrossL is the mean of the histogram of the crossing of the low reference level. See
RZ Measurement Reference Level s 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 automat ically set the measurement system to use a waveform database if available.