Interpolated Calculation Modes

Interpolation is used in many calculation modes. When using interpolated data, it is possible that there are no raw samples in the interval (such as with highly-compressed data) so the archiver requires additional samples to perform calculations.

The Minimum, MinimumTime, Maximum, and MaximumTime all use interpolation to arrive at two additional samples per interval. One is interpolated at the interval start time and one is interpolated at the interval end time. The interpolated samples are used in calculations just like raw, collected samples within the interval. In particular, the minimum or maximum calculated value can be a raw or interpolated value.

All described rules for interpolating a value at an interval's end time also apply to the interval's start time. There is no raw maximum or raw minimum sampling mode. To acquire these values, you must retrieve the raw samples using RawByTime or RawByNumber and compute the minimum or maximum yourself.

Similarly, you must also manually calculate a minimum or maximum when using values acquired through lab sampling.