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