# The Wireless Telegraphy (Control of Interference from Radio-Frequency Heating Apparatus) Regulations 1971, Paragraph 10


The field-strength expressed in decibels above 1 microvolt per metre will be given by the sum of: (a) the reading(s) of the attenuator(s), (b) the field-strength calibration constant (if any) appropriate to the frequency at which the measurement is being made, and (c) the reading of the indicating meter of the valve-voltmeter, if calibrated in decibels. If the result obtained is x decibels, the field strength expressed in microvolts per metre is given by the antilog to the base 10 of x/20

---
Source: https://www.legislation.gov.uk/uksi/1971/1675/schedule/2/paragraph/10 (the official version)
Page: https://openlegislation.uk/wireless-telegraphy-control-of-interference-from-radio-frequency-heating-apparatus-regulations-1971/schedule-2/paragraph-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.