datum plane

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datum plane


datum level


datum line

(Surveying) surveying the horizontal plane from which heights and depths are calculated
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In the real world, we simulate a primary datum plane such as A, the bottom of the PCB under consideration, by placing the PCB's bottom surface on a surface plate.
Parallelism--The condition of a surface, line, or axis which is equidistant at all from a datum plane or axis.