How Digital Multimeters Work and Use

Digital multimeter is a multi-purpose measuring instrument with stable performance, flexible use, high reliability, easy maintenance, etc. It is suitable for physics, electricity, electronics and other fields. Today we will mainly introduce the working principle and usage of the digital multimeter, hoping to help everyone.

How a Digital Multimeter Works

The function of the multimeter to measure voltage, current and resistance is realized through the conversion circuit part, and the measurement of current and resistance is based on the measurement of voltage, that is to say, the digital multimeter is expanded on the basis of the digital DC voltmeter. The converter converts the analog voltage that changes continuously with time into a digital quantity, and then the electronic counter counts the digital quantity to obtain the measurement result, and then displays the measurement result by the decoding display circuit. The logic control circuit controls the coordinated work of the circuit, and completes the entire measurement process in sequence under the action of the clock.

How to use a digital multimeter

Digital multimeters are relatively simple measuring instruments. In this article, the author will teach you how to use the digital multimeter correctly. Starting from the digital multimeter's voltage, resistance, current, diode, triode, MOS field effect tube measurement and other measurement methods, it will allow you to better grasp the multimeter measurement method.

Before use, you should carefully read the relevant instruction manual and be familiar with the functions of the power switch, range switch, jack, and special jack.

(1) Put the ON/OFF switch in the ON position, check the 9V battery, if the battery voltage is insufficient, it will be displayed on the display, and the battery needs to be replaced at this time. If the display does not show, follow the steps below.

⑵The symbol next to the test pen socket indicates that the input voltage or current should not exceed the indicated value, which is to protect the internal circuit from damage.

(3) Before the test. The function switch should be set to the range you need.