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All of these situations, including measurements which are not referenced to ground, either require or are enhanced by a differential measurement technique. There are several ways to allow a single ended scope to make differential measurements. One method which is very common is to float the scope, this is a bad choice and should not be attempted. Other methods are to use two single ended probes and then do the math, isolators can be used, or use true differential probes.
PTM Published on: 2012-04-26