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Greenlee DM-300 Manual

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*El factor de cresta es el cociente de un valor máximo en relación con el
valor eficaz; está representado por la letra griega ξ.
Medición de corriente alterna
Las mediciones de corriente alterna generalmente se muestran como valores
eficaces
(RMS o root mean squared)
. Existen dos métodos de medición de
corriente alterna:
calibrados para responder al valor eficaz medio
y
a una
lectura de valores eficaces reales
.
El método calibrado para responder al valor eficaz medio toma el valor medio
de la señal de entrada, la multiplica por 1,11 y muestra el resultado. El
resultado es exacto si la señal de entrada es una onda sinusoidal pura. El
modelo DM-310 de Greenlee es un multímetro que responde al valor medio.
El método de lectura de valores eficaces reales utiliza un circuito interno para
leer el valor eficaz real. Este método es exacto, dentro de las limitaciones de
factor de cresta especificadas, independientemente del tipo de señal de
entrada, ya sea una onda sinusoidal pura, rectangular, en diente de sierra o
señal con armónicas. La capacidad para leer valores
eficaces reales brinda
una mayor versatilidad de medición. Los modelos DM-300, DM-330 y
DM-350 de Greenlee son multímetros de valores eficaces reales.
La tabla de Formas de onda y Factores de cresta muestra algunas de las
señales de CA y valores eficaces reales más comunes.
Formas de onda y Factores de cresta
Forma de onda
Valor eficaz real 100 100 100 100
Valor medio 90 100 87 64
Factor de cresta*
1,414 1 1,73 2
(ξ)
… 114 …


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