The shunt measuring - what it is and where it is used

Perhaps you have heard this phrase as "a measuring shunt." And you know what that is? If not, or you just want to refresh their knowledge, in this article I will just talk about the measurement shunt, how they work and on what principle work. So, let's begin.

What is the shunt

First, let's find out the definition of what a shunt. So, if we turn to Wikipedia, there you can find the following definition: shunt - a device through which an electrical current can flow in the bypass of a section of the circuit. And in most cases consists of a resistor with low resistance coil or conductor.

And at its core shunt is nothing else than a simple converter current to a voltage. In most cases, the shunts used in DC circuits. Now let's see how it all works.

How does the shunt

Let's look at the simplest shunt, which in the diagrams referred to as a resistor.

And we assume that our network under consideration flows a constant current from point A to point B. And, having met in its path shunts current passes virtually unimpeded further because of the very low resistance of the shunt.

Now, let us remember what quantities is characterized by an electric current, and brush up on the Ohm's law:

Thus, the resistance of our with you shunt is constant and the voltage drop across it, we can always be measured using a conventional voltmeter.

And by converting Ohm's law, we see that the voltage is equal to:

And this implies a rather interesting conclusion: the constant resistance value of the voltage drop will depend entirely on the magnitude of the flowing current.

Where they are and what measurement shunts are made

So, to the principle of a shunt like everything is clear, and now let's see where it is used.

The main direction of the use of shunts - this instrumentation in DC. And they are made of manganin. Moreover, if the product is designed for measuring current up to 30 amperes, it is incorporated directly into the housing of the measuring instrument.

If you want to measure large current, it is usually in such cases, a shunt outdoor performance.

Shunts outdoor performance made already calibrated, that is originally designed for a specific voltage and current. Thus calibrated shunt usually calculated to the following voltage: 10U, 15U, 30 mU, 50 mU, 60 mU, 75 mU, 100 mU, 150 mU, 300 mV.

Shunts are also produced, calculated for a few limits.

During operation, the measuring shunts in AC networks, an additional interference from changes frequency due to the fact that the resistance of the shunt and the measuring mechanism have different values ​​at the same frequency.

Therefore shunts is such a thing as the accuracy class, and they are: 0.02; 0,05; 0,1; 0.2 and 0.5. These values ​​indicate the tolerance of resistance shunt percentage.

Where to buy this product

Shunts are also popular with amateur radio and sometimes quite sharply raises the question of where to buy the same product. Personally I did not find in the city for sale grafts, so they ordered the online store here this link.

conclusion

That's all I wanted to tell you about this interesting product as a shunt. If the article was useful to you, or are interested in, you will appreciate it Like. Thank you for your attention!