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Clip on meter use to measure
AC current
DC current
AC voltage
DC voltage
AC current
A clip-on meter, commonly known as a clamp meter, is designed to measure AC current by sensing the magnetic field produced by the alternating current flowing through a conductor. It allows for non-invasive measurement without breaking the circuit.
A clip-on meter, commonly known as a clamp meter, is designed to measure AC current by sensing the magnetic field produced by the alternating current flowing through a conductor. It allows for non-invasive measurement without breaking the circuit.
IsecondaryтАЛ=NIprimaryтАЛтАЛ тАФ where N is the transformer turns ratio
VoutтАЛтИЭdtd╬жтАЛ тАФ Faraday's Law of Induction
The clamp meter operates on the principle of electromagnetic induction, specifically acting like a current transformer. When the jaws are clamped around a conductor, the alternating current creates a changing magnetic flux in the core, inducing a secondary current in the internal coil proportional to the primary current. This induced current is then rectified and processed to display the root-mean-square (RMS) value of the AC current.
Measurement is non-invasive and safe as there is no galvanic contact.
Works specifically on the principle of a current transformer for AC signals.
Requires only one current-carrying conductor inside the jaws; clamping around both phase and neutral will result in a zero reading due to opposing magnetic fields.
No need to disconnect or cut wires to measure current.
Provides high level of safety for the operator.
Standard clamp meters cannot measure DC current without a Hall-effect sensor.
Accuracy can be affected by the proximity of other high-current conductors.
Electrical system troubleshooting
Power distribution maintenance
Measuring motor load currents
Standard clamp meters measure AC current using current transformer (CT) action; to measure DC current, an additional Hall-effect sensor is required.
Option B (DC current) is incorrect for standard clamp meters, though specialized 'AC/DC' models exist using Hall-effect sensors.
Options C and D are incorrect as clamp meters are fundamentally current-sensing devices, not voltage meters.
A is correct тАФ The clip-on meter (clamp meter) uses the principle of electromagnetic induction to measure AC current flowing through a conductor.
Always ensure the clamp jaws are fully closed for an accurate reading; any gap in the core introduces a magnetic reluctance that causes significant measurement errors.