Briefly describe the basic operation of measuring resistance with a multimeter
The basic operation of the multimeter resistance measurement.
1, first connected to the pen, the choice of multimeter can be a pointer can also be a number of bai show, the red pen inserted into the VΩ file, the black pen inserted in the COM terminal, to ensure that the multimeter is normal.
2, rotate the multimeter gear, measuring resistance should be used resistance gear, if you are not sure how much resistance value, you should first range switch, placed in the maximum value, and then by a large number of range to the small range gear to switch, so that the meter pointer indicates that more than 1/2 of the full scale can be. After selecting the appropriate magnification file, the two pens touch so that the pointer in the zero position, such as the pointer deviates from the zero position, you should adjust the "zero" knob, so that the pointer to zero to ensure that the measurement results are accurate.
3、Connect the two sections of the resistor, the pen is connected casually, there is no positive and negative points, make sure the contact is good.
4, read out the data displayed on the multimeter, if the multimeter does not appear, there may be bad resistors, of course, there is a possibility that the range is not enough, replace the range.
5, increase the range, if there has been no data, it can only mean that the resistor is bad. If there is data output data, pay attention to add the unit of the gear.
The basic principle of the multimeter:
Is the use of a sensitive magneto-electric DC ammeter (microampere meter) as a meter head. When a tiny current passes through the head, a current is indicated. But the head can not pass large currents, so the head must be connected in parallel and series with some resistors for shunt or voltage reduction, so as to measure the current, voltage and resistance in the circuit.
Notes on the use of multimeter:
1, in the use of the multimeter before, should first be "mechanical zero", that is, in the absence of measured electricity, so that the multimeter pointer in the position of zero voltage or zero current.
2、During 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 the 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, you should pay more attention to it. Otherwise, the multimeter will be destroyed. If you need to change gears, you should first disconnect the pen, change gears and then go back to the measurement.
4, multimeter in use, must be placed horizontally, so as not to cause errors. At the same time, it should also be noted to avoid the influence of external magnetic field on the multimeter.
5, the multimeter is used, should be placed in the maximum switch AC voltage gear. If it is not used for a long time, the battery inside the multimeter should be taken out to avoid battery corrosion of other devices inside the meter.
Concerns
1, if the use of 2113 electronic multimeter, to 5261 first gear 4102 bit adjusted to ohms.
2, before use to ensure that the 1653 pointer at 0 Ω, the version of the red pen and the right to the front of the black pen together, which will cause a short-circuit, if the pointer is not yet 0 Ω can be rotated to adjust the zero knob Q, so that the pointer points to zero ohms.
3, the red pen inserted into the "VΩ" hole, the black pen inserted into the "COM" hole, and then according to the circuit resistance to be measured to select the resistance gear.
4, the estimated circuit resistance value, the first multimeter adjusted to the resistance of the largest gear, if the measurement of the digital display is small, and not precise enough, we must adjust the gear.
5, the best reading is only two decimal points, adjusted to this gear read out the data is the most accurate.
