Characteristics, relevant methods of measurement and performance requirements (in some cases) for audio frequency peak programme level meters for use in equipment for broadcasting, sound reinforcement, sound recording and household entertainment.Cross References:BS 415BS 6840:Part 1BS 6840:Part 2BS 6840:Part 3BS 6840:Part 17CCITT Recommendation 661CCITT Recommendation J.15CCITT Recommendation N. 15CCIR Report 292-6