§ 2.947   Measurement procedure.

   (a) Test data must be measured in accordance with the following
   standards or measurement procedures:

   (1) Those set forth in bulletins or reports prepared by the
   Commission's Office of Engineering and Technology. These will be issued
   as required, and specified in the particular part of the rules where
   applicable.

   (2) Those acceptable to the Commission and published by national
   engineering societies such as the Electronic Industries Association,
   the Institute of Electrical and Electronic Engineers, Inc., and the
   American National Standards Institute.

   (3) Any measurement procedure acceptable to the Commission may be used
   to prepare data demonstrating compliance with the requirements of this
   chapter. Advisory information regarding measurement procedures can be
   found in the Commission's Knowledge Database, which is available at
   www.fcc.gov/labhelp.

   (b) Information submitted pursuant to paragraph (a) of this section
   shall completely identify the specific standard or measurement
   procedure used.

   (c) In the case of equipment requiring measurement procedures not
   specified in the references set forth in paragraphs (a)(1) through (3)
   of this section, the applicant shall submit a detailed description of
   the measurement procedures actually used.

   (d) A listing of the test equipment used shall be submitted.

   (e) If deemed necessary, additional information may be required
   concerning the measurement procedures employed in obtaining the data
   submitted for equipment authorization purposes.

   (f) A composite system is a system that incorporates different devices
   contained either in a single enclosure or in separate enclosures
   connected by wire or cable. If the individual devices in a composite
   system are subject to different technical standards, each such device
   must comply with its specific standards. In no event may the measured
   emissions of the composite system exceed the highest level permitted
   for an individual component. Testing for compliance with the different
   standards shall be performed with all of the devices in the system
   functioning. If the composite system incorporates more than one antenna
   or other radiating source and these radiating sources are designed to
   emit at the same time, measurements of conducted and radiated emissions
   shall be performed with all radiating sources that are to be employed
   emitting.

   (g) For each technical requirement in this chapter, the test report
   shall provide adequate test data to demonstrate compliance for the
   requirement, or in absence of test data, justification acceptable to
   the Commission as to why test data is not required.

   [ 42 FR 44987 , Sept. 8, 1977, as amended at  44 FR 39181 , July 5, 1979;
    51 FR 12616 , Apr. 14, 1986;  80 FR 33442 , June 12, 2015;  82 FR 50828 ,
   Nov. 2, 2017]

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