Product Information
- Name : Clamp meter
- SKU : BLT-56
- Category : clamp-meters
A clamp meter, also known as a clamp-on ammeter, is a portable electrical measuring instrument. Its core advantage is that it can directly measure AC current by clamping a single conductor with its open-close jaws, without the need to disconnect the circuit or pierce the wire. Most models integrate multimeter functions, capable of measuring parameters such as voltage, resistance, continuity, frequency, temperature, and DC current. They are available in digital and analog versions, are handheld and portable, and are commonly used by electricians for live inspections and current troubleshooting in circuits.
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**Working Principle**
Based on the principle of electromagnetic induction, the open-close transformer inside the clamp wraps around a single energized conductor. The alternating current in the conductor generates a magnetic field, which is sensed by the transformer and converted into an induced electrical signal. This signal is sent to the main unit for calculation, converting it into a current value. With the test lead jacks, it can expand to measure voltage, resistance, and other conventional multimeter functions. Some true RMS models can accurately measure non-sinusoidal load currents, offering stronger anti-interference data.
**Application Fields**
1. Electrical maintenance: Measure live current in distribution boxes, motors, and socket circuits without powering off or disconnecting wires.
2. Home appliance repair: Detect operating currents of air conditioners, refrigerators, and high-power appliances to diagnose equipment faults.
3. Power distribution inspection: Check temporary power on construction sites, factory busbars, and cable load currents.
4. Electrical construction: Monitor load currents of cable lines and distribution cabinet outputs to prevent overheating and overload.