Performance indicators of a multimeter
1. Response speed
The response speed is related to the AD conversion chip used internally in the multimeter. Most ordinary digital multimeters use dual integral form AD conversion chips. Although their accuracy can reach 4 and a half bits, the response speed is not ideal due to the integration process. When testing resistors, everyone feels that some multimeters display values very quickly, while others take a long time to come out. In addition, when testing the voltage, if there is any fluctuation in the voltage, a multimeter with a fast response speed can reflect it.
2. Measurement accuracy
We often hear of a 3 and a half (3 1/2) or 4 and a half (4 1/2) multimeter, which refers to the accuracy of the multimeter "1/2 bit" is a bit that can only display 1 or not
For example, "three and a half digits" (also known as "three and a half digits") can display 000-1999.
"3/4 digits" are digits that can display 1, 2, and 3, but other digits cannot be displayed.
Example: "Four and three quarters" can display 0000-39999.
When choosing a multimeter, accuracy can be chosen according to actual needs, with high accuracy and high price.
3. Function
The multimeter has a relatively complete range of functions. In addition to being able to test a wide range of voltage, current, and resistance values, it can also automatically switch ranges, test pulse frequency, capacitance capacity, monitor the maximum and minimum values of voltage and current, temperature, etc.
4. Security protection and firmness
The multimeter has excellent protection measures, including overcurrent, overvoltage, and warning functions for incorrect probe insertion (such as inserting the probe into the current test hole when testing voltage). A good multimeter has a sturdy casing and a good feel, especially when shifting gears, it feels very smooth. After using it for several years, there will be no poor gear contact. A good multimeter probe is also sturdy and durable, and will not easily break or have poor contact with the socket.
