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W135 — Why true RMS?

Measuring current accurately is a difficult job in today’s industrial plants and offices. More and more personal computers, adjustable speed drives and other types of equipment that draw current in short pulses rather than at a steady level come on line every day. Equipment like this can cause the readings of conventional average-responding meters to be at least inaccurate. If you have ever experienced blown fuses without any clear cause, then maybe your meter is to blame.