used as the Alignment Level, that level should be declared and that in both cases programme should peak to a Permitted Maximum Level of −9 dBFS when measured on an IEC 60268-10 quasi-PPM with an integration time of 10 milliseconds. Consumer use IEC 60268-10 is concerned mainly with the highly specified Type I and Type II PPMs used in broadcasting. It does however also contain a brief section on PPMs for 'secondary and consumer' applications. The requirements include a minimum of a 12-segment bargraph type display covering a range of −42 dB to +6 dB relative to nominal maximum level, and the same integration and return times as a Type I PPM. References Audio engineering BBC Research & Development British inventions Audiovisual introductions in 1932 German inventions Broadcast engineering Sound production technology Sound recording ru:Измеритель уровня звука