Si el lector necesita monitorear una tensión y no desea una solución cara o sofisticada. En realidad, hasta encontró un galvanómetro analógico (microamperímetro o miliamperímetro) en su stock de material y desea aprovecharlo, el circuito presentado en la figura consiste en una solución interesante. Este circuito permite que los galvanómetros de 50 uA a 2,5 mA de fondo de escala sean usados como voltímetros proporcionando una lectura de 1 uA por cada 100 mV de entrada. Es claro que si la tensión monitoreada es otra (otra pista) se puede añadir un divisor resistivo en la entrada del circuito. Un punto importante a ser considerado en ese circuito es su elevada impedancia de entrada, lo que le dota de una sensibilidad que puede ser muy importante en la aplicación deseada. La siguiente tabla proporciona los valores de R3 y R4 en función de la corriente de fondo de escala del instrumento utilizado. Observe que la fuente de alimentación del circuito debe ser simétrica.

 


 

 

   El trimpot P1 es un ajuste de nulo que compensa las eventuales hijas del CI, haciendo que el instrumento indique cero en ausencia de tensión de entrada.

 


 

 

 

18.81MBMemory Usage43.29msRequest Duration
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