Blanking Band

A plastic scale, or computer-generated scale, 1.7 in (43 mm) wide and 21.12 in (0.5 m) long representing a length of 0.1 mi (161 m) on a profilograph trace. The opaque blanking strip, running the length of the scale and located at its midpoint, covers the profile trace. Typically, a bandwidth of 0.0 to 0.2 in (0 to 5 mm) is used.

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