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 - Museum Coverage: The Stuttgart Agricultural Museum - by Cindy Ladage. While cold wind was blowing back in Illinois, in Arkansas, daffodils were in bloom, and the Magnolia trees were adorned with fragrant blossoms. Stuttgart, Arkansas was the site of this year's winter Minneapolis Moline Collector's show February 25-27, 1999. The show was held at the Oliver Museum created by Don Oliver, the pioneer of the four wheel drive tractor. Oliver along with Gale Stroh and Kenneth Bull using Minneapolis Moline tractors and parts created what has become known as
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