# The Measuring Instruments Regulations 2016, Paragraph 1.4.1


Basic rules for testing and the determination of errors
Essential requirements specified in paragraphs 1.1 and 1.2 shall be verified for each relevant influence quantity. Unless otherwise specified in the appropriate instrument-specific Schedule, these essential requirements apply when each influence quantity is applied and its effect evaluated separately, all other influence quantities being kept relatively constant at their reference value.
Metrological tests shall be carried out during or after the application of the influence quantity, whichever condition corresponds to the normal operational status of the instrument when that influence quantity is likely to occur.

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Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/1A/paragraph/1.4.1 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-1A/paragraph-1.4.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.