Sometimes you hear the expression "test loop" (in the context of a test software environment). An interesting history of the origin of this expression. Wikipedia on this subject is silent.

  • most likely this expression from your local environment. I would not be surprised if people who are connected with electronics invented it. - KoVadim
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    @KoVadim, no, in its environment I heard this more than once and in completely different companies / locations. So it's definitely not a “local environment” - xhr
  • @alexanderbarakin quite a lot of people use this term and no one can clearly explain where it came from. However, this "stable expression" must have an interesting story - xhr
  • Slang from electronics, since the lamp times. Look in Google for "heterodyne loop", "loop with feedback", "electronic loop". - KAGG Design
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    @KAGGDesign and what is the connection with the "test circuit"? the general word “contour” is not everything, we need an explanation of why the “heterodyne contour” and the “test contour” are interconnected (if so). I didn’t see the intersection yet ... - xhr

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