how a dc clamp meter works?

Answer 1

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...

Answer 2

How Clamp Meter Works

Answer 3

It used to measure AC currents work on the principle of electromagnetic induction caused by the alternating current flowing in the conductor which reverses direction causing a dynamically changing magnetic field. However, in DC conductors, the current flows in a fixed polarity. Consequently, the magnetic field around the conductor is fixed and does not change. Hence, a conventional clamp meter will register no reading.

A DC clampmeter works on the principle of the Hall Effect. The Hall Effect, named after Edwin Hall who discovered it 1879, states that when a conductor carrying current is placed in a magnetic field, a potential is induced across the conductor, transverse to an elcarriers, electrons or holes, experience a force known as the Lorentz force and are pushed to the sides of the conductor.
A clampmeter which works on the Hall effect has a sensor known as the Hall element. The Hall element is subjected to the magnetic field caused by the flow of current to be measured. This causes a small voltage across the Hall element. This voltage is amplified and measured.


https://www.electrikals.com/products/rc-meters/clamp-meters?cnid=237&cid=620&page=1&pagesize=20

Answer 4

I didn't know there was a such thing as a DC clamp meter.

An AC clamp meter works by induction. similar to how a transformer works. But since DC doesn't produce continuously varying magnetic lines of force, I don't see how it would work. (Unless, of course, it is Varying or Pulstaing DC. Both of these actually have an AC component to them.)

Answer 5

A DC clampmeter works on the principle of the Hall Effect. The Hall Effect, named after Edwin Hall who discovered it 1879, states that when a conductor carrying current is placed in a magnetic field, a potential is induced across the conductor, transverse to an electric current in the conductor and a magnetic field perpendicular to the current. It is caused as the charge carriers, electrons or holes, experience a force known as the Lorentz force and are pushed to the sides of the conductor.

A clampmeter which works on the Hall effect has a sensor known as the Hall element. The Hall element is subjected to the magnetic field caused by the flow of current to be measured. This causes a small voltage across the Hall element. This voltage is amplified and measured.
https://www.electrikals.com/products/r/meters/a?cid=620&mid=e767e5db503d9cac0150b305ab24439a&cnid=237&page=1&pageSize=15

Answer 6

Is this a meter used to test computer monitors?

If it is, I think the way it works is it tests the clamp circuits that monitors use to produce video signals. There are usually several (RGB monitors require three color signals multiplexed together and a dc clamp circuit to amplify each one).

When one of the clamps is out of whack, you can attach the meter to tell which one is properly amplifying the video signal.