3. Control principles and operations
3.1 Control operations
Measuring instruments must be of acceptable quality and be used correctly and fairly. In practice, this means that inspection must take place at three levels:
at the design stage, with the type examination (formerly known as "model approval");
during the manufacturing process, including initial inspection of the instruments produced;
and finally in service, including installation verification, verification of repaired instruments and periodic verification.
Type examination consists of checking that the instrument type complies with all applicable requirements under normal environmental...
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Control principles and operations
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