The window timer is started as soon as the pulse is launched, and enables the control electronics to receive {TAIL ~ a signal} from {HEAD ~ the sensors} when the preset time has expired 
The window timer is started as soon as the pulse is launched , and enables the control electronics to receive { TAIL ~ a signal } from { HEAD ~ the sensors } when the preset time has expired
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH