Which device is used with meters to measure high amperage?

Which device is used with meters to measure high amperage?

• A. Inductive Pick-Up
• B. Current Transformer
• C. Shunt
• D. Hall Effect Sensor

Answer: (A)

The main idea is measuring high currents without wiring the meter in series with the load by sensing the magnetic field produced by the current. An inductive pick-up uses a coil around the conductor (often as a clamp) to pick up that magnetic field. The changing current in the conductor induces a voltage in the coil (Faraday’s law), and this signal is scaled so the meter reads proportional to the actual current. This method provides electrical isolation, avoids dissipating power in the meter, and is well suited for high-amperage measurements, especially for AC where the current varies. A current transformer works on the same principle and is also used for high currents, but in the context of meters and typical test setups, the inductive pickup is the specific sensing element described for measuring high amperage. A shunt would drop a voltage by resistor heating and is less practical for very high currents. A Hall effect sensor can measure DC and AC but is usually more expensive or less common in basic high-current meter setups.

The main idea is measuring high currents without wiring the meter in series with the load by sensing the magnetic field produced by the current. An inductive pick-up uses a coil around the conductor (often as a clamp) to pick up that magnetic field. The changing current in the conductor induces a voltage in the coil (Faraday’s law), and this signal is scaled so the meter reads proportional to the actual current. This method provides electrical isolation, avoids dissipating power in the meter, and is well suited for high-amperage measurements, especially for AC where the current varies.

A current transformer works on the same principle and is also used for high currents, but in the context of meters and typical test setups, the inductive pickup is the specific sensing element described for measuring high amperage. A shunt would drop a voltage by resistor heating and is less practical for very high currents. A Hall effect sensor can measure DC and AC but is usually more expensive or less common in basic high-current meter setups.