La Sonda de Prueba del Osciloscopio
La Sonda de Prueba del Osciloscopio
About the Book
La sonda del osciloscopio, es un buen punto de partida para visualizar el abstracto mundo de los electrones en su curso por la materia física.
La punta de prueba pasiva -o sonda- es el elemento sensor del osciloscopio. La capacitancia de los cables de interconexión, es el efecto más importante a considerar en su diseño y fabricación; ya que ésta puede reducir la impedancia efectiva a valores mínimos, permitiendo de esta manera cargar la medición y como consecuencia distorsionar la señal medida. Con frecuencia, para compensar la capacitancia de derivación adicionada por los cables, se emplea una punta de prueba de compensación pasiva en el extremo del cable de la sonda. Básicamente, esto consiste de un condensador coaxial variable (Cp), en paralelo con una resistencia fija (Rp). Este arreglo inevitablemente provoca una disminución en la amplitud de la señal. Los valores de la resistencia se seleccionan para que resulte un valor conveniente de atenuación. Suele utilizarse un factor 10X, de manera que el efecto sea el mismo al que se consigue cuando se conmuta el atenuador de entrada del osciloscopio a la siguiente posición más alta.
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