How to use digital voltmeter and its applicable areas

With the continuous development of science and technology, digital display voltmeters have gradually entered our field of vision and are gradually known by more and more people. It is generally used for on-site monitoring of power grids and automatic control systems, which is very common in today's society. So what are its characteristics? The following Group Innovation Technology will learn more about the tips for choosing a digital display voltmeter and its applicable areas.

We often encounter customers who say to us: "Just choose a commonly used measuring range" or "Just use the conventional measuring range." These words often make business personnel quite embarrassed. The reasons for the embarrassment are mainly based on the following points:

1. Commonly used measuring ranges may not be suitable for you. For example: if you want to measure 10A current, and the current we sell may be 5A, if the salesperson directly gives you a 5A ammeter, the result will be that the meter is burned out.

2. Conventional measuring range is a very vague term. The conventional measuring range in each industry is different. Business personnel may not necessarily know what the conventional measuring range is in your industry.

If you want to close the deal without burning the meter, the salesperson may choose a relatively large range for you so that you can use it normally without burning the meter. Since there is such a good thing, and it is simple and convenient to handle, why don't the business people do this? Why do they have to ask you for a measurement range?

Let’s take a look at what happens when we use a “large range” meter to measure the “small range” value? Let's take measuring 10A current as an example. If you don't tell the salesperson how much current you want to measure, the salesperson may give you an ammeter with a range of 100A or more just to be on the safe side. What will happen if you take 100A and measure 10A? Before that, you have to understand one thing. Digital display instruments generally have an "accuracy", and this accuracy is related to the measuring range.

If the accuracy of the ammeter is 0.3%, then the ammeter with a 100A range can be accurate to 100×0.3%=0.3A. In the same way, an ammeter with a 10A range can be accurate to 10×0.3%=0.03A. Do you understand these two data? If you are still not clear, take a look at the following real story:

We once encountered a customer using a 1A ammeter to measure microamps. 1A=1000μA, 1×0.3%=0.003A=3μA. A 1A ammeter with a 0.3% accuracy is only accurate to 3μA. It cannot measure a current of 1μA at all. The measurement is also inaccurate. In fact, in real life, no one uses a floor scale (a scale used to measure the load of a car) to weigh. For this reason, it is impossible to measure it. Even if there is data to show it, it is inaccurate. This is the consequence of measuring the "small range" with a "large range" meter. The greater the range difference, the lower the measurement accuracy will be.

Therefore, when you choose three-phase digital voltmeters, digital voltmeters and other digital instruments, you must pay attention to the choice of "range". Choosing the conventional range is not your choice.

1. Function

The three-phase digital display voltmeter is integrated to measure the current, voltage, active power, reactive power, frequency, power factor, active energy, reactive energy, voltage harmonics, current harmonics, zero sequence current, It is a digital power instrument with multiple rate measurement and various multi-functional interfaces such as RS485 communication, 4-20mA analog output, switching input and output. It is currently widely used in power automation, intelligent buildings, factory automation, environmental protection and energy saving, industry control and other fields.

2. Usage occasions:

1. Building energy consumption management system.

2. Power transmission and transformation automation monitoring system.

3. Internal assessment management system for industrial enterprises.

4. Community high and low voltage distribution cabinets.

5. MNS, GCK, GGD and other low-voltage distribution cabinets.

6. Power monitoring of computer room and UPS precision power cabinet.