The current measurement function of a clamp multimeter is based on a current transformer and the internal measuring circuit. The transformer core has a movable part connected to a handle. When in use, push the handle to open the core, place the wire to be measured inside the jaws, and then release the handle to close the core. At this point, the wire passing through the jaws acts as the primary winding, inducing a current in the secondary winding that depends on the current in the wire and the number of turns in the coil. The ammeter is connected across the secondary winding, showing the induced current, which is proportional to the actual current in the wire. The scale is calibrated to reflect the primary current accurately. To use the clamp meter, set the range switch to the appropriate current setting. Hold the meter body, press the switch with your thumb to open the jaws, insert the wire into the center of the core, and release the switch to allow the core to close automatically. Once closed, the current flowing through the wire generates an alternating magnetic field, and the meter displays the current value directly. Before using a digital multimeter, read the instruction manual carefully to understand the power switch, limit switch, input jacks, and various functions. Familiarize yourself with the instrument’s limits, overload indicators, polarity display, low-voltage warnings, and decimal placement rules. Check the test leads for cracks or damaged insulation, and ensure they are properly inserted for safe operation. Always verify that the correct range and input jack are selected before each measurement. During measurement, the display may show fluctuations; wait for stabilization before taking readings. Although modern digital multimeters have built-in protection circuits, avoid mistakes such as measuring voltage with the current range or measuring capacitors with the wrong settings, as these can damage the device. If only the highest digit shows '1' while others are blank, it indicates an overload—adjust to a higher range. Never switch ranges while measuring voltages above 100V or currents above 0.5A, as this can cause arcing and damage the switch contacts. Input jacks often have hazard symbols indicating maximum input limits. Exceeding these values could damage the meter or pose a safety risk. Clamp meters should never be used on high-voltage lines. Ensure the tested voltage does not exceed the specified limit (usually below 500V) to prevent insulation failure and electric shock. Estimate the current before measurement and choose an appropriate range. Avoid using a small range to measure large currents. Always set the range switch to the correct AC current position before measuring. Do not use the voltage or resistance settings to measure current, as this can burn out the meter. Only one wire should be clamped at a time, and it should be placed in the center of the jaws to improve accuracy. Flatten the wire with your hand if possible to prevent it from touching the jaws. After finishing the measurement, turn the range switch to the highest voltage setting and then turn off the power to ensure safe handling for future use.
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