Based on a white paper by Neil Faulkner and Jeff Gust, Fluke CalibrationFluke 8588A Reference MultimeterAbstractHistorically, analog null meters, also called analog null detectors, have been used to determine zero voltage conditions in metrological applications. When digital multimeters (DMMs) became available with sensitivity comparable to null meters, they were adopted quickly, and analog null meters were set aside. However, depending on the circuit and the DMM, significant measurement errors can...