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[Chemical Knowledge]：The correct method and precautions for measuring electricity

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In electronic circuits, resistance is a very common component, we often need to measure the resistance of the circuit. The correct resistance measurement method can ensure the accuracy of the measurement results, and at the same time can protect the measuring instrument and extend its service life. Here we introduce the need to pay attention to matters when measuring resistance.

choose the right resistance meter is very important. For the measurement of small resistance value, it is necessary to select a resistance meter with small internal resistance; for the measurement of large resistance value, it is necessary to select a resistance meter with large internal resistance. At the same time, it is also necessary to pay attention to the measurement range of the resistance meter and select the appropriate measurement gear to avoid damage to the instrument or failure to obtain accurate measurement values due to the wrong gear selection.

Before measuring the resistance, it is necessary to ensure that the circuit where the resistance is to be measured is in a power-off state. Otherwise, other components in the circuit may affect the resistance measurement result, resulting in inaccurate measurement. In the case of power failure, it is also necessary to confirm that the battery of the resistance meter is sufficient to ensure that the instrument works normally.

When connecting the resistance to be measured and the resistance meter, it is necessary to ensure that the connection is firm and the contact is good. If the connection is poor, contact resistance will occur, which will affect the accuracy of the measurement results. In addition, you also need to pay attention to the way of connection. For the resistance measurement of low power, the resistance meter connected at both ends can be directly measured, while for the measurement of high power resistance, it is necessary to use the series voltage method or the parallel current method.

In addition, for some special types of resistors, such as inductive coupling resistors, nonlinear resistors, etc., special measurement methods and instruments may be required to ensure the accuracy of the measurement results. After the end of the

measurement, it is necessary to turn off the power in time and remove the measuring plug on the resistance meter to avoid the instrument being in the measuring state for a long time and affecting the life and accuracy of the instrument.

the correct resistance measurement method is an important guarantee to ensure the accuracy of the measurement and the protection of the instrument. I hope everyone can pay attention to the above matters when measuring resistance to ensure the accuracy of measurement results and the safe use of the instrument.

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