Let the multimeter play a greater role in maintenance
1. Emphasis on functional diversity while ignoring the matching of accessories
Some users pay more attention to the diversity of multimeter functions when purchasing, but they tend to ignore the matching of accessories. Without the necessary accessories, the diversity of functions cannot be realized naturally. For example, some users hope that the purchased multimeter can detect the starting current and detect the temperature under various conditions, but they do not purchase special current clamps and thermometer probes. If you want to give full play to the function of a car multimeter, the matching of some accessories is very critical. Some of these accessories are necessary, and more are matched with the corresponding functions of the car multimeter.
The accessories in the car multimeter usually include the following types: inductive pick-up, battery alligator clip, special test clip for SMD patch components (used to test parameters such as SMD resistance, capacitance, inductance and transistors, which can be operated with one hand, making Measurement is more convenient), current sensors, pressure probes, torque probes and IC probes, etc. These accessories are generally less used in maintenance. For maintenance companies, when purchasing accessories, they should consider several aspects such as the user's technical quality, the maintenance company's financial status, and daily use, so as to make an appropriate choice in order to achieve the maximum utilization of the equipment.
2. Give up good equipment because of simple language barriers
Some users want to buy high-end imported car multimeters, but when they find that the interface language is English, they easily give up products with more complete functions or high-end products. In fact, this is not necessary. The basic functions of various multimeters are similar, and many functions are marked with common symbols, so it is not complicated to use. As long as you go through a simple study, you can quickly master the method of use.
Multimeters are generally not idle, but many functions are not fully utilized in maintenance.
1. "Give up on choking" for some functions
Some maintenance personnel are often afraid to use a multimeter because they are worried about damaging the equipment during the test, the most obvious one is the current test. The current test method is not complicated, such as the starting current, the primary and secondary current of the ignition coil, and the current test of the fuel injector, many fault clues can be found as a basis for diagnosis, but technicians rarely use it in maintenance. It is understood that many repairmen are afraid to use the current test function because they are afraid of "burning the meter" or damaging the components under test due to misoperation of the test. In fact, many multimeters are designed with special circuit devices or mechanical protection devices in order to protect integrated circuits. For example, one more DY2201 multimeter adopts a mechanical protection device for the current measurement jack to prevent misuse. Only when current measurement is selected, the corresponding "mA" or "20A" jack will be opened. Otherwise, it will be blocked by the baffle, which can effectively avoid inserting the wrong test leads. Maintenance personnel can boldly use the current test function, but must operate in accordance with the use process.
2. Insufficient emphasis on errors in testing
Any instrument will have errors in the measurement, but the errors should be minimized in the measurement to avoid operating errors to ensure the accuracy of the measurement results. The large errors that often occur in the use of multimeters are sometimes caused by instruments, and sometimes caused by some human factors. The following two aspects need to attract the attention of maintenance personnel: ①Because the accuracy and resolution of the multimeter are not enough, if the judgment is only based on estimation, it will often lead to human error. ②Due to the different test methods of various multimeters, the multimeters will have their own instrument errors in different signal tests. Therefore, when using multimeters, maintenance personnel should try to use instruments with high precision levels, and at the same time strictly follow the operating procedures. reduce the error.
