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Z-plane definition

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in measuring semiconductor leadframes for characteristics such as lead and die pad planarity, the reference Z-plane is defined as the average of the height of the two dambars when measured at their geometric center, given that the dambars do not differ in location by more than 0.003 in. [SEMI G9-89]

See also:

X-ray fluorescence (XRF) definition

Zucker-Hammett hypothesis definition
X-ray photoelectron spectroscopy (XPS) definition
X-X axis definition