Correct Reading Method for Analog Multimeter
There are many types of pointer multimeters, and it is necessary to prepare for measurement before use, such as checking the working status of each button on the multimeter before measuring; During the use of a multimeter, there may be a problem called reading error. When all previous operations are normal, it is not worth the loss due to reading errors. Below are detailed reading methods:
The reading method of a pointer multimeter is as follows (assuming the pointer stays at the position shown in the figure below)
1. Resistance reading
Read from the resistance scale line. The pointer is between 15 and 20. In this large grid, there are 5 small grids that are evenly distributed, each with a value of 1. Therefore, the pointer indicates "17". Multiply 17 by the resistance level multiple to obtain the measured value. If the knob is in the "R * 100" position, the resistance value represented by this value is 17 * 100 Ω=1700 Ω=1.7K Ω.
2. Voltage reading
The AC and DC voltage scale lines are evenly distributed, with a total of 5 large grids. Each large grid is further divided into 2 small grids, and each small grid is further divided into 5 small grids. The voltage value represented by each grid varies depending on the gear position.
When the function knob is in the "500" position, each large grid represents 100. Each smallest grid represents 10, and the position where the pointer stops in the figure is between 240 and 250, approximately 248V, which can be read as 248V.
If the function knob is in the "10V" position, each large grid represents 2. Each smallest cell represents 0.2, and the position where the pointer stops in the figure is between 4.8 and 5, approximately around 4.9, which can be read as 4.9V.
Hint
The purpose of using a multimeter for measurement is to check if the circuit is functioning properly. The read data should be compared with the normal data in the circuit to determine whether the circuit is normal, and used as the starting point for judging and finding faulty components.
Note:
When measuring with a pointer multimeter, after the pointer stabilizes, observe and remember the position where the pointer stops, and then leave the measuring point with the probe. This is done to prevent the circuit from being affected by the sliding of the probe when observing the pointer.
