![]() Before using the current probe the core must be degaussed without wires inserted in the core.Gain can be increased with compensation turns ratio at the expense of bandwidth.Side NoteTrue RMS RF power meters work something like above, except instead of magnetic loop matching, they use a thermal resistor and using a bridge to compare RF heat with a DC heater for accurate measurements and obviously much lower bandwidth from thermal time constant, but very accurate. The advantage is that the non-linear properties and hysteresis of both the core and the magnetic sensor have little influence on the measurement results.Beside the described measurement circuit there is also demagnetization circuit. As a result of this the core will never be magnetized. It works only when the dial is set to measure direct currents. The zero button on your meter is designed to remove DC offsets. Wait for the display on the clamp meter to be stable, then press the zero button. ![]() This magnetic field is measured with the sensor and as a result of this, the control circuit runs a current through the compensation winding in a way that the magnetic flux in the core is kept zero. To ensure your DC amps measurement is accurate, make sure the jaws of your meter are closed, and there is no conductor inside or close to it. A hall-sensor, which measures the magnetic flux in the core.The current in the primary wire will magnetize the core. The core is provided with an air gap that holds a sensor, e.g.
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