Precautions for Purchasing Digital Multimeters
Digital multimeters are the most basic test instruments for electronics enthusiasts. A good digital multimeter can not only measure various electrical parameters, but also serve as a powerful helper for troubleshooting and repairing electrical appliances. There is a wide variety of digital multimeters available on the market. How can you select one that is cost‑effective and suitable for your needs?
Start with your actual requirements
Digital multimeters have diverse classifications. By structure, they are divided into bench‑top digital multimeters and handheld digital multimeters. Based on whether they are equipped with a microprocessor, they can be classified into conventional A/D conversion types and intelligent digital multimeters. By display resolution, they include 3½‑digit, 4½‑digit digital multimeters, and so on.
The price of a digital multimeter varies with its accuracy, construction, brand and intelligent functions. Prices on the market range from just over ten yuan to tens of thousands of yuan. Therefore, you must clarify your intended use before purchasing: for routine tests with low accuracy requirements, an inexpensive handheld digital multimeter is sufficient. For precision measurement, repair work, or applications requiring high reading stability, a high‑grade handheld or bench‑top digital multimeter is recommended.
Points to note when purchasing
A. Accuracy
Accuracy directly affects the reliability of measurement results. When you get a digital multimeter, first examine its accuracy specifications to verify whether they meet your requirements and evaluate its overall performance. Do not assume that a 4½‑digit multimeter is always more accurate than a 3½‑digit one. A poorly manufactured 4½‑digit model may underperform a well‑made 3½‑digit unit. For example, a DT9103 4½‑digit multimeter from an unknown small manufacturer may show severe digit flickering during measurement and fail to meet its published specifications.
