Tektronix CSA8000B - Manual (Page 292)

Appendix B: Automatic Measurements Reference
B- 30 CSA8000B & TDS8000B User Manual
Table B- 5: RZ Measurements - Timing (cont.)
Name Definition
RZ Cross+ The time of a positive crossing, defined as the mean of the histogram of the data sampled at
the mid-reference level.
Cross+ = Tcross
Where Tcross is the mean of the histogram of a positive crossing. 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). By default the algorithm searches forward from the Start Gate
for the first rising edge, but the Direction of traversal can be reversed, so that the search will be
backward from the 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 automatically set the measurement system to use a waveform database if available.
See Use a Waveform Database on page B--70.
RZ Cross- The time of a negative crossing, defined as the mean of the histogram of the data sampled at
the mid-reference level.
Cross-- = Tcross
Where Tcross is the mean of the histogram of a negative crossing.
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). By default, the algorithm searches forward from the Start Gate
for the first falling edge, but the Direction of traversal can be reversed, so that the search will be
backward from the Stop Gate.
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.