​Motor test measurements often require ammeters to be equipped with multiple shunts to solve the problem of ensuring the required measurement accuracy over a larger measurement range.

The shunt used in the power battery PACK is essentially a resistor to detect the current value flowing. Since the current value is not easy to monitor, most of them are converted into voltage at present, that is, when the current passes, the resistor generates a voltage drop, and the voltage value is detected to calculate the passed current value, which is based on U=IR.

The 7550A is an ammeter with a measurement range from 1µA to 250A. The voltage on the shunt is switched to the internal four-and-a-half-digit AC and DC ammeter directly displayed by the five file-bit buttons and on the external output terminal. AC and DC current values with high accuracy and resolution.

In essence, electrical components all have inductive components, but in different scenarios, the main characteristics displayed are different. We only say which is a resistive component and which contains an inductive component, mainly considering two factors.

Simply put, it is to effectively use the range of the voltmeter. For example, a voltmeter with a full scale of 75mv, the object to be measured is a current of about 20A, you choose the shunt resistance R, and R*20A should preferably fall on the middle of the 75mV range, such as 3mΩ to 3.5mΩ for comparison Suitable.

The shunt conductor is a three-dimensional entity. Under the action of high-frequency current, the distribution of the current in the conductor obviously shows a skin effect, and most of the current flows on the surface of the conductor.

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.

What is a shunt resistor? A shunt resistor is a resistor with a small resistance value for measuring DC current. It is made according to the principle of a voltage drop across the resistor when the DC current passes through the resistor, and converts the current signal into a voltage signal for DC current detection.

​Due to its special function of shunt resistors, when used in precision electronic products, such as instruments, meters, and measuring devices, the resistor should be selected with special emphasis on accuracy. If the accuracy is not enough, it may cause the size of the shunt current to pass through a large Difference value projection, which directly leads to larger measurement errors, which would be meaningless measurements. In the same way, for other precision electronic information technology products, because the development of Chinese enterprises has high requirements, it is necessary for us to choose resistors with high precision.