Safety-relevant ultrasonic sensor system with transmitter and for the self test for monitoring of this ultrasound sensor system by means of monitoring of the amplitude component of a reason - or harmonic

摘要

It is an automatic test liquids sensor system (ss) is proposed, the four states, an operating state and can have three test states. Stimulated in the third state, a digital signal generation (dso) directly to the digital input circuit (dsi) with test signals as a result of which the signal chain can be checked. In the second basic cells stimulates the digital signal generation (dso) the analog signal chain (dr, as) and the digital input circuit (dsi) with test signals as a result of this signal chain can be checked. In the third basic cells stimulates the digital signal generation (dso) the analog signal chain (dr, as), the sensor part of the apparatus (tr) (typically a ultrasonic transducer 20) and the digital input circuit (dsi) with test signals as a result of this signal chain tested and to the parameter for maintenance can be monitored. In the operating state stimulates the digital signal generation (dso) the analog signal chain (dr, as), the sensor part of the apparatus (tr) (typically a ultrasonic transducer 20) and the digital input circuit (dsi) with measurement signals in which case the signal chain on parameters for maintenance can be monitored. There is a monitoring of the amplitude value a reason - or harmonic.n="173"