There is very structured testing that occurs during product development to safeguard against exactly what you're talking about. The test consists of bombarding the wiring with a wide spectrum of frequencies and watching the controller outputs with an oscilloscope for any sign of weird behavior. The test is quite severe in that the emitter is literally clamped around the wiring harness so it is a lot stronger of a signal than what would reasonably be experienced during normal machine operation. A second part of the testing is to make sure that the machine itself isn't emitting electro-magnetic interference (EMI) that could cause problems for other devices. This is a lengthy test and usually takes several full days to complete depending on the complexity of the machine's electronic systems. Ideally the testing would happen in a specialized "clean room" that is shielded from external EMI but due to the physical size of some machines it is also done in shop buildings that are free of "electrically noisy" equipment like welders and two-way radio systems. Most companies would regard passing these tests is a prerequisite to serial production of machines with critical electronic controls.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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