Edge calculations
Edge1, Edge2, and Edge3 refer to the first, second, and third Mid reference edge times, respectively.
An edge can be detected when the waveform is either rising or falling past Midref. The direction of the edges alternates, that is, if
Edge1 is rising, Edge2 will be falling.
A rising edge has positive polarity. A falling edge has negative polarity.
The instrument calculates these values as follows:
1. Find the first Mid reference edge in the waveform record or the gated region. This is Edge1.
2. Continuing from Edge1, find the next Mid reference edge in the waveform record (or the gated region) of the opposite
direction of Edge1. This is Edge2.
3. Continuing from Edge2, find the next Mid reference edge in the waveform record (or the gated region) of the same direction
as Edge1. This is Edge3.
Cycle-cycle measurements are made on each cycle of the waveform. In the diagram above a cycle starts at Edge1 and ends at
Edge3.
TPOS is the location of the sample just before the trigger point (the time reference zero sample). In other terms, it contains the
domain reference location. This location is where time = 0.
TSOFF is the offset between TPOS and the actual trigger point. In other words, it is the trigger sample offset. Values range
between 0.0 and 1.0 samples. This value is determined by the instrument when it receives a trigger. The actual zero reference
(trigger) location in the measurement record is at (TPOS + TSOFF).
Measurement concepts
MSO54, MSO56, MSO58, MSO58LP, MSO64 Help 431
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