Appendix B: Automatic Measurements Supported
B-6
CSA7000B Series & TDS7000B Series Instruments User Manual
High. The value used as the 100% level in amplitude measurements, such as Peak
and +Overshoot. High is also used to help derive the HighRef, MidRef,
MidRef2, and LowRef values.
Low. The value used as the 0% level in amplitude measurements, such as Peak
and --Overshoot. Low is also used to help derive the HighRef, MidRef, MidRef2,
and LowRef values.
HighRef. The waveform high reference level, used in such measurements as fall
time and rise time. Typically set to 90%. You can choose how this level is set;
see Reference Levels Method on page 3--143.
MidRef. The waveform middle reference level used in such measurements as
Period and Duty Cycle. Typically set to 50%. You can choose how this level is
set; see Reference Levels Method on page 3--143.
LowRef. The waveform low reference level. Used in fall and rise time calcula-
tions. Typically set to 10%. You can choose how this level is set; see Reference
Levels Method on page 3 --143.
Mid2Ref. The middle reference level for a second waveform (or the second
middle reference of the same waveform). Used in two-waveform time measure-
ments, such as the Delay and Phase measurements. You can choose how this
levelisset;seeReference Levels Method on page 3--143.
Levels Used in Taking Eye Measurements
All eye-diagram measurements are based on the power level, the voltage level, or
the time locations of edges within each acquisition.
Figure B--2 shows an eye-diagram and the areas from which values are taken that
are used to calculate measurements.
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