Minus Coplanarity, the Distance Between the Lowest Fiber and the “Best-Fit Plane” Through the Array of Fibers

Published: February 7, 2019

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Minus Coplanarity is simply the distance between the lowest fiber and the “best-fit plane” through the array of fibers (also called the “fiber line”). It is a measure of fiber height variation within an array of fibers. A lower number is better, with a value of “0” indicating the theoretical ideal – all fibers are EXACTLY the same height.

The best-fit plane is a line through the array of fiber protrusions calculated by using the mathematical “least square method.”. Think of it as a straight line through the array which is the best representation of all heights. The least square method is high-school math and not extremely complicated, but it is exactly the same formula used in Excel graphs when you add a linear trendline through data points.

READ THE BLOG: MT Ferrule Geometry Specifications: Minus-Side Coplanarity in IEC 61755-3-31:2015

Additional resources from the FOC team include:

Category Resource:
- FOC Fiber & Cable Page
View the Glossary, Acronyms, Military Specifications for Connectors
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