Clamp Meter
how a dc clamp meter works?
In order to use a clamp meter, the probe or clamp is opened to allow insertion of the wiring, and then closed to allow the measurement. Only one conductor is normally passed through the probe, if more than one conductor were to be passed through then the measurement would be a vector sum of the currents flowing in the conductors and could be very misleading depending on the phase relationship of the currents. In particular, if the clamp were to be closed around a mains extension or similar cord, no current will be measured at all as the current flowing in one direction will cancel that flowing in the other direction.
The meters also often contain a mechanical pointer-locking device so that a reading can be taken in locations where the meter pointer can’t be seen, the pointer then locked, and the meter brought out to a more-convenient place for reading.
Newer units often read both AC and DC current.
A Hall effect device is used to detect the DC magnetic field induced into the clamp.
The signal from the Hall effect device is amplified and displayed using a built-in DVM. Typical handheld units can read currents as low as 200mA, and units which can read down to 1mA are available.
hope this helps u…
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