In many of these embodiments, {TAIL ~ an impact force measurement} associated with a test of a moveable barrier operator is obtained and {HEAD ~ an impact force signal} representing the impact force measurement is generated 
In many of these embodiments , { TAIL ~ an impact force measurement } associated with a test of a moveable barrier operator is obtained and { HEAD ~ an impact force signal } representing the impact force measurement is generated
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH