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 - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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