Period measurement algorithm
The time between two adjacent crossings of the Mid reference level (one cycle) of the waveform. Period is measured in horizontal units,
typically seconds.
Period = Edge3 - Edge1
Phase measurement algorithm
Phase is the ratio of the Skew between two sources to the Period of the first source. It is the amount of phase shift between edges of
the two waveforms. The phase shift is expressed in degrees of the Source1 waveform cycle, where 360 degrees is one complete cycle
(Period) of Source1. For best results, Source1 and Source2 should be of the same frequency or one waveform should be a harmonic of
the other
.
Phase is determined in the following manner for each cycle of the record:
1. The first two adjacent edges of the configured 'from' edge type are found in Source1.
2. The period of Source1 is calculated (see Period above). If the "from" edge is set to either, the half-period of Source1 is calculated.
3. The first edge in Source2 in the configured 'to' edge direction is found.
4. The Skew from the first Source1 edge to the next Source2 edge is calculated.
(Skew/Period)*360
5. When "from" edge is either, the calculation is (Skew/half-Period)*180.
Positive Duty Cycle measurement algorithm
Positive Duty Cycle is the ratio of the positive pulse width to the signal period, expressed as a percentage.
PositiveWidth is defined in Positive Pulse Width, following.
Positive Pulse Width measurement algorithm
Positive Pulse Width is the time the signal remains above the mid reference level. It is the distance from a rising edge to the next falling
edge.
Rising Slew Rate measurement algorithm
Rising Slew Rate is the rate of change in value as an edge transitions from the low or mid reference level to the mid or high reference
level. The levels are configurable.
In the diagram below, the Rising Slew Rate from mid ref to high ref is calculated using the following equation:
(VREFHI - VREF)/ΔTR
Measurement algorithms
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