As a measurement principle, clamp meters detect the magnetic field emitted by current flowing in a wire in order to measure the current value. Unlike instruments like multimeters, this design has the advantage of being able to measure current without requiring that the circuit under measurement be cut.
For example, in order to measure a battery used in an automobile or uninterruptible power supply (UPS), or a photovoltaic cell, you'll need a clamp meter that can measure DC current.
Choose an AC load current clamp meter for ordinary measurement applications, or a leakage current clamp meter if you need to measure leakage currents caused by insulation defects or current flowing in a ground wire for electrical equipment.
Clamp meters designed to measure load currents can only be clamped around one wire. Be careful not to clamp the instrument around multiple wires at the same time as doing so will prevent proper measurement. Clamp meters designed to measure leakage currents require a bit more caution. Ground wires should be measured alone.
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Clamp meters are a convenient choice in such situations. This page offers a detailed explanation of how to use a clamp meter as well as related precautions. What is a clamp meter? A clamp meter is a
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