Reduction or prevention of errors; Testing; Calibration

Introduced: January 2022

Full Title

Measuring instruments characterised by the use of optical techniques > Interferometers > Reduction or prevention of errors; Testing; Calibration

CPC subdivides this area 4x more granularly than IPC with 3 additional codes.

3 codes are CPC-only extensions.

IPC defines codes here since 2022.

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G01B 9/02056 Passive reduction of errors since 2022 +3 CPC IPC+CPC Available in IPC and CPC
G01B 9/02062 +3 CPC CPC only CPC only
G01B 9/0207 +2 CPC CPC only CPC only
G01B 9/02075 +3 CPC CPC only CPC only