Performance indicators for multimeters
1. Response speed
Response speed is related to the AD conversion chip inside the multimeter. Most of the common digital multimeter adopts double integral form of AD conversion chip, although its accuracy can reach 4 ½, but because there is an integral process, so the response speed is very unsatisfactory. When testing resistance, we feel that some multimeters display values particularly fast, while some values have to wait a long time to come out. In addition, when testing voltage, if the voltage fluctuation, the fast response speed of the multimeter will be able to reflect.
2. Measurement accuracy
We often hear 3 1/2 (3 1/2) or 4 1/2 (4 1/2) of the multimeter, said the accuracy of the multimeter." 1/2 digit" is the digit that can only display 1 or not.
Example: "Three and two-half digits" (also called "three and a half digits") can display 000~1999.
The "3/4 digit" is a digit that can display the numbers 1, 2 and 3, but not other numbers.
Example: "Four and three-quarter digits" can display 0000~39999.
When choosing a multimeter, you can select the precision according to the actual needs, high precision, the price is also expensive.
3. Function
Multimeter function is more complete, in addition to testing a wide range of voltage, current, resistance value, but also can automatically convert the range, test the pulse frequency, capacitance, monitoring the maximum and minimum values of voltage and current, temperature, etc..
4. Safety protection and firmness
Multimeter has very good protection measures, with over-current, over-voltage, the pen inserted into the wrong reminder function (such as testing voltage, the pen will be inserted into the current test holes) and so on. Good multimeter casing firm, feel better, especially in the gear change, feel especially smooth, used for several years, there will be no poor contact with the gear. Good multimeter pen is also durable, will not be easily broken, and jack contact problems.
In summary, if the economy allows, have a piece of outstanding performance of the multimeter, like marrying a beautiful and virtuous wife, a lifetime of inexhaustible.
