Patent ID: 7332829

Claim:
A condition monitor system comprising: a plurality of input terminals for receiving pulses different from one another in time intervals of repetition; a capacitor for changing a capacitor voltage when charged and discharged in response to the pulses applied to the input terminals; a discharging means for discharging the capacitor, the discharging means including a switching device provided in a discharging path to turn on only a predetermined time in response to each of the pulses; a charging means for charging the capacitor after the discharging; and an output means for generating a condition signal which switches a signal level when the capacitor voltage reaches a predetermined level, wherein the discharging means is connected to be responsive to each of the pulses and instantly change the capacitor voltage to a fixed level in each operation, and wherein the charging means is connected to gradually change the capacitor voltage at a rate which allows a continuous change of the capacitor voltage crossing the predetermined level, the rate being set in accordance with a possible maximum time interval among the time intervals of the pulses.