# The Wireless Telegraphy (Control of Interference from Radio-Frequency Heating Apparatus) Regulations 1971, Paragraph 7


(1) The measuring receiver shall be adjusted and operated in accordance with the relevant instruction manual. The field-strength shall be observed over the whole of the work cycle of the radio-frequency heating apparatus and the highest value, subject to the provisions of paragraph 9 of this Part of this Schedule, shall be taken.
(2) The frequency at which a test is being made shall be measured by means of a frequency meter incorporating a crystal controlled frequency standard having an inherent error of measurement not greater than one part in one hundred thousand.
The frequency shall be measured over the load range from the lowest power normally used to maximum power.

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Source: https://www.legislation.gov.uk/uksi/1971/1675/schedule/2/paragraph/7 (the official version)
Page: https://openlegislation.uk/wireless-telegraphy-control-of-interference-from-radio-frequency-heating-apparatus-regulations-1971/schedule-2/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.