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应用文章
Stray voltage, sometimes referred to as ghost voltage, is a voltage that appears in an electrical conductor such as a wire, even though the wire is disconnected from an electrical circuit. Electricians and technicians frequently encounter stray voltages in electrical systems when measuring the AC voltage in electrical circuits that have been disconnected. Measuring the circuit us[1]ing a high-impedance handheld digital multimeter can make it difficult to differentiate stray voltages from legitimate readings. In this situation, identifying and resolving the source of the stray voltage can cost time, effort, and money. This application note presents an alternative tool for identifying the presence of stray voltages: the Keysight Technologies, Inc. U1272A handheld digital multimeter (HH DMM.) This paper also explains how the U1272A’s ZLow feature makes it easy for technicians and electricians of every skill level to identify the presence of stray voltage in all types of electrical installations. To illustrate the differences in voltage measurement tools, this application note uses an actual situation in which stray voltage was identified.
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