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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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