capacitor in frequency meter

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lats

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Hi friends,

The other day i was studying a frequency meter in a magzine. The circuit had a resistor & capacitor at the input of frequency signal (to be measured). Please see the attachment.

Although very small question, (Sorry i'm too poor in analog electronics), can you please tell me why this capacitor has been used. & how to calculate this capacitor value.

I'm trying to design a circuit to measure frequency from 0 - 100 Hz.

Thanks.
 

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