The right is the best, this is the first element of choosing a multimeter.
For example, if you only use a multimeter to measure the continuity of the circuit, and you want to bring it with you from time to time, you can choose a portable multimeter without current measurement function. For another example, your work area is very sensitive to power consumption, and you often need to measure uA-level current. Then you need to buy a multimeter with high current measurement accuracy and capable of measuring uA-level current.
At present, almost everyone uses digital multimeters, and analog multimeters are rarely used, so we will focus on the choice of digital multimeters.
1. The basic functions of a multimeter
The basic function of a multimeter is to measure resistance, voltage, and current. These three are also the most commonly used in our daily circuit testing, so now basically every multimeter has three functions. However, there are exceptions. For example, some small, portable multimeters do not have the current measurement function. Its two test leads are fixed and cannot measure current.
With the development of measuring instrument technology, the functions of multimeters are now becoming more and more powerful. For example, many multimeters have diode detection, triode detection, capacitance detection functions, and some have temperature detection functions (special temperature monitoring probes are required) , Even more high-end multimeters can measure waveforms, which is equivalent to a simple oscilloscope.
Faced with many common multimeters with rich functions, when choosing multimeters, they are often confused. Sometimes they are greedy and think that the more functions the better, but we must know that for electronic products, more functions mean The more complex the operation, the easier it is to damage. There is also a very important point. The more powerful the function, the higher the price.
2. Choose a multimeter according to the nature of work
As we said before, we must choose a multimeter according to actual needs. For functions that are rarely used in our work or are used with very low frequency, we can make appropriate choices. For example, for the diode measurement function, in many cases, we can use the resistance file to measure its on-off. Therefore, when the two measuring voltage, resistance, and current functions are exactly the same, one of them has the diode measurement function and the other does not. Then we can choose the one without diode measurement function.
Three, choose a multimeter according to the price
When we buy a multimeter, we generally have to consider the price (except for local tyrants). The more functions, the higher the price, which is inevitable.
In addition, the higher the measurement accuracy, the higher the price.
So we have to choose according to needs. If we have high requirements for measurement accuracy in our work, as we said before to measure uA-level current, then we must choose a multimeter with high measurement accuracy.
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