Principle of operation of multimeter resistance
1, gear switch: move to the ohm gear needs gear (or from large to small experiments).
2, pointer zero: two pens shorted, adjust the zero knob, so that the pointer points to zero position.
3, even reception resistance measurement: dial resistance scale reading, multiplied by the gear switch times, the product is the resistance value. Pointer in the middle of the more accurate, you can shift test.
4, two hands do not touch the resistance, reduce the measurement error. After the measurement of the multimeter gear to the highest AC voltage, or disconnect gear.
Expanded information:
Multimeter is divided into the traditional multimeter and digital multimeter, the traditional multimeter is the pointer electromagnetic deflection type, each time before using the need for mechanical zeroing, the use of more cumbersome and the number of readings has a subjective and inaccurate, and now has been rarely used; and the digital multimeter can be directly displayed digitally, without observing the scale reading, the results of a more accurate, and is now more widely used.
Multimeter measurement of resistance resistance value of the notes:
(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.
