ANSI C63.4A:2017 pdf download.Methods of Measurement of Radio- Noise Emissions from Low-Voltagen Electrical and Electronic Equipment intheRangeof9kHzto40GHz-Amendment 1: Test Site Validation.
NOTE 1—–The editing instructions contained in this amendment define how to merge the material contained therein into the existing base standard to fonn the comprehensive standard.
The editing instructions are shown in bold italic. Four editing instructions are used: change, delete, insert, and replace. cliaisge is used to make corrections in existing text or tables. The editing instruction specifies the location of the change and describes what is being changed by using strikethrough (to remove old material) and underscore (to add new material). Delete removes existing material. Insert adds new material without disturbing the existing material. Insertions may require renumbering. If so, renumbering instructions are given in the editing instruction. Replace is used to make changes in figures or equations by removing the existing figure or equation and replacing it with a new one. Editing instructions, change markings, and this NOTE I will not be carried over into future editions because the changes will be incorporated into the base standard.
NOTE 2—In this document, a table note (a note to a table) is informative, and a table footnote is normative. A table note is set immediately following the table to which it belongs, enclosed within the boxed table, above the bottom border of the table. General notes apply to the entire table and are introduced by ‘NOTE—” set in all, uppercase letters. A table footnote always contains normative information. A table footnote is set outside of the boxed table to which it belongs, immediately below the bottom border. Table footnotes are marked with lowercase letters starting with “a” for each table.
NOTE— This amendment mainly updates the test 3’ahdatwn procedures in Annex D in (63.4-2014 and corrects equations iii several annexes. At the May 2017 meeting of ASC C63”, another addition to the amendment was approved. This addition corrected the value of the separation distance between the receiving antenna and the equipment under test. The latter correction brought it back to what was in previous editions of ANSI C63.4. Hence, this amemidment combines changes in the Annex D test site evaluatiom,, corrections to equations in annexes, and a correctioli to the antenna to equipment under test separation distance value in 4.5 of the maim, body of the standard.
4.5 Antennas
4.5.1 General considerations
Table 1—Radiated emissions antennas for exploratory and/or relative-comparison evaluation purposes (and their frequency ranges of operation)
The aperture dimensions of these horn antennas shall be small enough so that the measurement distance (in m) is equal to or greater than the Rayleigh distance, where B is the largest dimension of the antenna aperture (in m).
Table 2—Antennas (and their frequency ranges of operation) for use in making final compliance measurements on devices
1 The aperture dimensions of these horn antennas shall be small enough so that the measurement distance (in in) is equal to or greater than the Rayleigh distance.ANSI C63.4A pdf download.