Regulation 4 Requirement

The requirement hereinbefore referred to is that the apparatus shall be so designed, constructed, assembled and installed, and that such precautions shall be taken in relation to it (by means of the fitting of suppressors or otherwise), as to ensure that the field-strength, as measured and computed in accordance with the next following paragraph, of the electro-magnetic energy radiated at any frequency between forty and seventy megacycles per second in any direction from the apparatus when it is used, does not exceed fifty microvolts per metre at any distance of not less than thirty-three feet measured as specified in paragraph 4 of Part 3 of the Schedule hereto.

For the purpose of measuring and computing the field-strength of such electro-magnetic energy, the apparatus shall be tested by means of measuring apparatus of the description and having the physical and electrical characteristics and performance set out in Part 1 of the Schedule hereto, and the test shall be made by the method and under the conditions set out respectively in Parts 2 and 3 of the said Schedule. The field-strength of the electro-magnetic energy radiated as aforesaid from the apparatus shall be computed as provided in paragraph 5 of Part 2 of the said Schedule from the readings afforded by the measuring apparatus while the apparatus being tested is energised.