Here is a brief description of the basic operation of measuring resistance with a multimeter
1,Firstly select the range of multimeter in the area of resistance file, and select the larger range in priority.
2, the multimeter internal or pen line itself has a certain resistance, in order to accurately measure the resistance value of the measured electrical appliances, the first step is to measure its internal resistance, the red and black pens in contact with each other, the value read out from the multimeter is the internal resistance of the multimeter itself, under normal circumstances, the internal resistance of the following 2 ohms.
3,When measuring the measured resistance, disconnect the power supply of the measured line, otherwise it will affect the measurement accuracy, and damage the multimeter in serious cases, for example, to measure the resistance of the electrical appliances or lines on the car, you can disconnect the battery power.
4, will be connected to the multimeter pen and the measured components, and then adjust the gear in the normal range, in the event that you do not know the resistance of the measured appliances, you can measure from a large range of small range, if a large number of the range of the value shown as 0.00, that is, the gear is larger, you can continue to adjust the small, to measure the resistance.
5, finally, the multimeter shows the normal value of the measured component or line with the multimeter itself the sum of the resistance, this time to use this value minus the internal resistance of the multimeter to get the resistance of the measured component, such as the measured resistance value of 2.6 minus 0.4 in this figure, the correct resistance value is 2.2.
Multimeter to measure the resistance of the resistance value of the precautions:
(1) in the use of the multimeter should be carried out before the "mechanical zero", that is, in the absence of measured power, so that the multimeter pointer in the position of zero voltage or zero current.
(2) In the process of using the multimeter, you should not touch the metal part of the pen with your hand, so as to ensure the accuracy of the measurement on the one hand, and ensure personal safety on the other hand.
(3) When measuring a certain amount of electricity, you can't change the gear at the same time of measuring, especially when measuring high voltage or high current. Otherwise, the multimeter will be destroyed. If you need to change gears, you should disconnect the meter pen first and change gears before measuring.
(4) When using the multimeter, it must be placed horizontally to avoid errors. At the same time, it should also be noted to avoid the influence of external magnetic field on the multimeter.
