Apparatus for picking up and analyzing emitted accoustic and ultrasonic signals by means of {HEAD ~ a piezoelectric pick up element} connected to {TAIL ~ an amplifier} with high input resistance, the output of the amplifier being connected for further evaluation to selective circuits and to an evaluation device 
Apparatus for picking up and analyzing emitted accoustic and ultrasonic signals by means of { HEAD ~ a piezoelectric pick up element } connected to { TAIL ~ an amplifier } with high input resistance , the output of the amplifier being connected for further evaluation to selective circuits and to an evaluation device
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH