A clamp meter allows for quick and easy measurement of current while electrical equipment or machinery is in operation, without the need to stop it. This is achieved by clamping (or gripping) the electrical wire.
Unlike a multimeter, a clamp meter can safely measure current without the need to cut the wiring in the circuit.
However, if used incorrectly, inaccurate measurements may be retrieved.
In this article, we explain the correct way to use a clamp meter.
First, rotate the function switch so it is set to the correct range before measuring.
Note that measurement will not be possible if you try to clamp multiple wires or parallel wires such as power cords.
Please measure using a single wire as shown in the diagram below, or use a line separator.
Measuring at the center of the clamp reduces measurement errors.
When there is force applied to the tip of the clamp, accurate measurements cannot be obtained.
Furthermore, clamp meters that can measure direct current (DC) are also available.
When measuring a DC current, perform zero adjustment before taking measurements.
For DC current measurements, align the polarity of the clamp with the direction of the current you want to measure.
If the direction is reversed, the polarity on the display will be indicated as “-“, allowing you to determine the direction of the current.
A clamp meter clamps around the wire and measures the current in the wire by picking up the magnetic field generated around it.
Therefore, if there are other objects nearby that generate a magnetic field, they could interfere with the measurement.
Additionally, changing the orientation of the clamp meter body may cause slight fluctuations in the reading due to the influence of Earth’s magnetic field.