Precise test analysis of shunts
The shunt is used to measure DC current, and it is made according to the principle that a voltage is generated across the resistor when the DC current passes through a resistor with a small resistance value.
In practical applications, to measure a large current value, there is no large-range ammeter to measure its current, and the shunt can work. Both ends of the shunt generate a millivolt-level DC voltage signal, so that the meter connected in parallel at both ends of the shunt displays the voltage value, the resistance of the shunt is a fixed value, and the actual measured current value is obtained by calculation.
However, in actual production, the resistance value of the shunt is not so accurate, and its resistance value also changes slightly under different temperature conditions. So how to choose the most accurate shunt? It can only be proved by testing whether the shunt purchased is accurate.
