W dniu piątek, 29 marca 2019 08:46:37 UTC+1 użytkownik charles napisał: > > On 2019-03-28 10:09 p.m., johnk wrote: > > the FTC in the States started cracking down and said that any power > claims had to be based on teh RMS output (.707 of the peak) using a sine > wave with Specified distortion. AND that the unit had to be conditioned > at almost maximum power (75% if I recall, or Perhaps 90%)for several > minutes before taking the measurement. SOME units sudenly could not > show ANY power as the pre-conditioning was enough to cause them to shut > down or Melt down. > That would be 0,707 (1/sqrt(2)) voltage output on a resistive load. RMS power of a sine wave is 0,5 times peak power. I like to know maximum constant RMS output, because it tells me a lot about the amplifier and its capability. The peak power or "music power usually" lacks a definition (I can easily imagine a design that would allow for short pulse of higher power, but power supply/amplifier would fry up if it was to deliver this peak power for longer time). I like that FTC definition requiring amplifier to work with high output power before taking a measurement, which is watts RMS.
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