Measurement-computing CIO-DI48 Manuale Utente Scaricare il pdf (Pagina 22)

interference associated with line voltage (60 Hz) would be filtered out but a signal of

25 Hz would be allowed to pass.

In digital input circuits, low-pass filters are sometimes used to “de-bounce” inputs

from relay or switch contacts.

A simple low-pass filter may be constructed from one resistor (R) and one capacitor

(C). The cut-off frequency is determined by the formula:

Fc = 1

2 *π * R * C

R = 1

2*π* C * Fc

Where π = 3.14...

Fc = frequency in cycles per second

R = resistance in Ohms

C = capacitance in Farads

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Measurement-computing CIO-DI48 Manuale Utente Pagina 22