APPARATUS AND A METHOD FOR AUTOMATICALLY TESTING A SYSTEM WHICH RECEIVES AN ANALOG INPUT SIGNAL

摘要

A testing system which periodically applies an analog test signal to an input storage capacitor and converts the value of the voltage stored on the capacitor to a digital number which is compared with an original digital test signal. Failure of the capacitor, an analog-to-digital converter or an intervening amplifier is detected by the comparator because the two signals will not agree. An error signal is generated by the comparator in the event of such a failure.