Patent ID: 6148055
Filing Date: 2000-11-14
Classification: G01D,G01P,G01R

Abstract:
A counting apparatus comprising:pulse counting means for counting the number pulses of a pulse signal being counted that is input thereto, and for generating an output when said number pulses of the pulse signal being counted reaches a predetermined value;signal switching means for switching between said pulse signal being counted and a high frequency pulse signal of a higher frequency than said pulse signal being counted;control means for controlling said signal switching means so that the pulse signal input to said pulse counting means is switched to said high frequency pulse signal when said output generated from said pulse counting means is input to said control means; andfrequency discriminating means which is input with a dividing signal generated from said pulse counting means each time the number of said high frequency pulse signal input to said pulse counting means reaches said predetermined value, and which generates an output indicating that a counting operation of said pulse counting means is acceptable only when said dividing signal is a predetermined frequency.