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