The clamp-type ammeter is easy to carry, and can directly measure the working current of the electrical equipment in operation without disconnecting the power supply and disconnecting the wire, so as to facilitate timely understanding of the working condition of the equipment, and therefore is widely used in repairing electrical appliances (such as air conditioners, etc.), but in use The following points should be emphasized:
1. First estimate the magnitude of the measured load current before measuring, and select the appropriate range gear accordingly. If it is impossible to estimate, in order to prevent damage to the clamp ammeter, the maximum range should be selected to start the measurement and gradually change to the appropriate range. The jaws of the clamp ammeter should be opened when changing the range.
2. In order to avoid or reduce the error, the wire to be tested should be placed in the center of the clamp mouth as much as possible.
3. When measuring, the clamp of the clamp ammeter should be tightly connected. If there is noise during the measurement, the jaw can be re-opened and closed to make the jaws joint; or carefully check and remove the debris and dirt. Make measurements.
4. When measuring small current, in order to make the reading more accurate, the measured current-carrying wire can be measured by taking several turns of the current-carrying wire and then put it into the jaw for measurement, but the reading value of the instrument at this time is not the current of the measured current-carrying wire. The value is the product of the actual current value of the measured wire and the number of turns. Therefore, the actual value of the measured wire should be divided by the number of turns placed in the jaw.
5. At the end of the measurement, the range gear switch should be placed in the highest gear position to prevent the instrument from being damaged due to inadvertent measurement without selecting the appropriate range for the next use.
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