Shunt

Shunt
Shunt is based on DC current through the resistor voltage generated at both ends of the principle of resistance is made.
Shunt is widely used to expand the scope of measuring current meter, there is a fixed valuation and precision alloy shunt resistors, can be used in communications systems, electronic machine, automatic control circuit for limiting power supply, etc., are current sampling test.
For DC current measurement shunt has a slot-type and non-slot type. Shunt resistors are manganese nickel-copper alloy rods and copper belt, and is plated with nickel. Rated voltage drop is 60mV, but it can also be used as 75,100,120,150, and 300 mV.
Slot-type shunt current ratings are the following: 5 A, 10 A, 15 A, 20 A and 25 A
The non-slot-type shunt rated currents from 30 A to 15 kA are the standard separation.
Shunt used to measure the DC current;
Shunt resistor actually is a very small resistance, when there are direct current flows out of date, resulting in pressure drop for the DC ammeter display;
DC ammeter voltmeter is actually, full scale value 75mV;
DC ammeter and shunt, the ancillary use;
For example: 100A ammeter shunt matching of 0.00075 Europe;
Namely, 100A * 0.00075 Europe = 75mV;
50A ammeter shunt supporting Europe as 0.0015;
50A * 0.0015 Europe = 75mV.
To measure a large DC current, such as the tens of amps, even greater, hundreds of amps, we do not then the process a large number of ammeter for current measurement, how should I do? This can be done using the shunt. Shunts is a can be high-current precision resistor, when the current flows through the shunt when it appears the two ends of a mV-level voltage, so we use the millivolt voltage meter to measure the voltage, then this voltage is converted into electricity. on the completed a high-current measurements.
Ammeter There are many different specifications, but the actual header is a standard millivolt voltage meter. Example, is a full-scale voltage of 75mv table. So with this piece of voltmeter measurements such as 20A current, you need to give it with a 20A current flow when the voltage drop generated 75mv shunt resistor, also known as 75mv shunt.
Shunt is a significant current through the resistance of commonly used 15A or 20A and 35A of the need to shunt ammeter. Shunt impedance = header logo full-scale voltage / current full scale header. For example 20A of the ammeter shunt device resistance = 75mv * 10-3/20A = 0.00375

This is a common electrical circuit products, lightning protection measures are triage.