Manganese copper is used in many articles. Today I will […]
Manganese copper is used in many articles. Today I will explain to you the principle of manganese copper on the manganese copper shunt.
Manganese copper shunt principle The shunt is made according to the principle of generating a voltage across the resistor when a DC current passes through the resistor. The shunt is widely used to expand the measuring current range of the instrument. There are fixed fixed-value shunts and precision alloy resistors, which can be used for current limiting and current-sampling detection of communication systems, electronic complete machines, and automatically controlled power supply circuits.
Shunts used for DC current measurement are slotted and non-slotted. The shunt has manganese-nickel-copper alloy resistance rods and copper strips, and is plated with a nickel layer. Its rated voltage drop is 60mV, but it can also be used as 75, 100, 120, 150 and 300mV.
Slotted shunts have the following rated currents: 5A, 10A, 15A, 20A and 25A non-slotted shunts have rated currents from 30A to 15KA standard intervals. The shunt is used to measure DC current: the shunt is actually a resistance with a very small resistance value. When a DC current passes, a voltage drop is generated for the DC ammeter to display: the DC ammeter is actually a voltmeter with a full-scale value of 75mV; a DC ammeter It is used in conjunction with the shunt; for example: the shunt resistance of the 100A ammeter is 0.00075 ohms; 100A * 0.00075 = 75mV; the shunt resistance of the 50A ammeter is 0.0015 ohms: 50A * 0.0015 ohms = 75mV.
To measure a large DC current such as tens of amps or even greater, two hundred amps, we do not have such a large range of ammeters to measure the current, what should I do? This requires the use of a shunt. The shunt is a Through the precise resistance of the large current, when the current flows through the shunt, a voltage of one millivolt will appear at both ends of it, so we use a voltmeter to measure this voltage, and then convert this voltage into current The measurement of large current is completed.