B887 "Sarah" Switch Bounce Test System

Nearly all switches will generate some "bounce" when they are operated (switched). Every time they are operated, they will actually open and close their contacts several times before they settling down to their new position. For normal switches, this can last from as little as a fraction of a millisecond (ms), to as long as several milliseconds. Only very high quality switches generate little or no bounce. This switch bounce is not usually a problem if you are merely turning on something simple like a light, but if you are working with more sensitive things like logic devices, all these extra bounces can create havoc. An example of a problem would be that if every time you pressed a button to increment a counter you actually added several counts to the total.

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