En relación al tema del margen de error hice la consulta directamente al fabricante ReliableMeters en la página web: http://www.reliablemeters.com/html/contact.html ---------inicio consulta Comments about InSite Power Recorder. I need to understand the following: Accuracy ± 0.3% rdg, ± 0.2% FS at 0 ­ 100% FS Would you please explain the accuracy assuming the following example: FS = 5 A IL = 2 A (the load) Measured Harmonic h23 = 1% ± 0.2% I understand 1% is 1*2/100 = 0.02 A and accuracy ± 0.2% is: a) 0.2*5/100 = ± 0.01 A then h23 = 0.02±0.01 A b)0.2*0.02/100 ± 0.00004 A then h23 = 0.02±0.00004 A c)0.2*2/100 = ± 0.004 A then h23 = 0.02±0.004 A Is a) or b) or c) or ...? Thanks, Eduardo Lucero ---------final consulta La respuesta recibida fué la siguiente: --------------------------- From: "Wade Thompson" To: Sent: Wednesday, December 05, 2001 8:21 PM > Eduardo, > a) is the closest match. Full scale would be 707vrms for voltage and 20arms > for current. > > Wade Thompson > Technical Support Manager > 400 Blossom Hill Road > Los Gatos, CA 95032 > Tel: 408-358-5100 > Fax: 408-358-4420 --------------------------- Refiriendo esta respuesta al instrumento Reliable PM: Accuracy = ±1% FS (0.5% típico) FS = 5 A IL = 1.674 A (66.947 A primarios) Se midió: h23 = 0.62%(base 1.674 A) ± 0.5%(base 5 A) h25 = 0.46%(base 1.674 A) ± 0.5%(base 5 A) en amperes: h23 = 0.0104 A ± 0.0250 A h25 = 0.0077 A ± 0.0250 A y en % base 1.674: h23=0.62% ±1.49% h25=0.46% ±1.49% Como conclusión, dado este margen de error superior a 1%, no deberíamos considerar límites menores que 1%. Atte., Eduardo Lucero (2) 3353819