(1) Before using the multimeter, “mechanical zero adjustment” should be performed first, that is, when there is no measured power, the pointer of the multimeter should be pointed to the position of zero voltage or zero current. _
(2) In the process of using the multimeter, you cannot touch the metal part of the test pen with your hands. On the one hand, you can ensure the accuracy of the measurement, and on the other hand, you can ensure your personal safety. _
(3) When measuring a certain amount of electricity, you cannot shift gears while measuring, especially when measuring high voltage or large current. Otherwise, the multimeter will be destroyed. If you need to change gears, you should disconnect the meter pen first, and then measure after the gear shift. _
(4) When the multimeter is in use, it must be placed horizontally to avoid errors. At the same time, attention should be paid to avoid the influence of external magnetic fields on the multimeter. To
(5) After the multimeter is used, the transfer switch should be set to the maximum range of AC voltage. If it is not used for a long time, the battery inside the multimeter should also be taken out to prevent the battery from corroding other components in the meter. _
When measuring DC with a digital multimeter
1. Perform mechanical zero adjustment. _
2. Select the appropriate range gear. _
3. When using the multimeter to measure current with the current block, the finished meter should be connected in series in the circuit to be measured, because only the series connection can make the current flowing through the ammeter the same as the current of the branch under test. When measuring, disconnect the branch under test and connect the red and black test leads of the multimeter in series between the two points where the quilt is disconnected. Special attention should be paid to the fact that the current recording can be connected to the circuit under test. This is very dangerous and will easily burn the multimeter. _
4. Pay attention to the polarity of the measured electricity. _
5. Correct use of scale and reading. _
6. When the 2.5A gear with direct current is selected, the red test lead of the multimeter should be inserted into the 2.5A measuring jack, and the range switch can be placed on any range of the direct current gear. _
7. If the measured DC current is greater than 2.5A, the 2.5A block can be expanded to 5A block. The method is very simple. The user can insert a 0.24 ohm resistor between the "2.5A" jack and the black test lead jack, so that the gear becomes a 5A current stop. The 0.24A resistor connected should be a wire wound resistor of 2W or more, if the power is too small, it will burn. _
The above information is organized by Shanghai Automation Instrumentation Co., Ltd. I hope it can be helpful to you. Shanghai Automation Instrumentation Co., Ltd. is a professional company focusing on instrument sales and instrument maintenance in the fields of electronic testing and industrial testing. To provide customers with "rich test product choices, complete system test solutions, professional test software development, comprehensive technical support and after-sales service". At present, the company is mainly engaged in the sales and maintenance of electronic test equipment, and the development of self-developed products. It has become one of the largest comprehensive instrument service providers in the Northwest.