Types and use of clamp-on ammeters
1,AC clamp-on ammeter
AC clamp-on ammeter is composed of a current transformer and a rectifier ammeter. When holding the clamp meter spanner, the core of the current transformer open, use it to cover the measured current wire, and then relax the spanner. This wire as the primary side of the current transformer winding, in the core of the current transformer is the secondary side of the winding, the secondary side of the winding through the rectifier and a magneto-electric system connected to the ammeter. According to the current transformer primary and secondary winding between a certain ratio relationship, the rectifier system instrument can display the current value of the measured line. By switching the conversion switch to change the ratio of the current transformer, you can get an ampere to tens of thousands of amperes of different ranges.
2, AC and DC dual-purpose clamp current
AC and DC dual-use clamp ammeter shown in the figure above, its shape is similar to the AC clamp ammeter, which is composed of electromagnetic system measurement mechanism. When clamped the measured current wire, the iron core in the magnetic field, located in the iron core gap in the measurement mechanism of the moving iron by the magnetic field and deflection drive pointer, its working principle is similar to the electromagnetic system instrumentation, so it can be used to measure the AC current, but also can be used to measure DC current.
3,Multi-clamp ammeter
Multi-purpose clamp ammeter by the clamp transformer and multimeter, when the connection line is pulled out of the transformer, the jaws do not work, can be used as a multimeter.
Clamp ammeter use
1, select the appropriate range block, not with a small range block to measure the large current, if the measured current is small, the current-carrying wire can be wound around a few more times into the jaws of the measurement, the reading should be divided by the number of coils is the actual current value. Measurement is complete, the switch should be placed in the maximum range block position (or closed position), so that the next safe use.
2, do not switch the range gear in the process of measurement, so as not to bend the needle; if you need to change the gear, you should first withdraw the measured wire from the jaws and then change the gear.
3, pay attention to the circuit voltage should be lower than the rated value of the clamp-on ammeter, do not use low voltage clamp-on ammeter to measure the current of high-voltage circuits, otherwise it is easy to cause accidents or electric shock hazards.
4, Thunderstorms, outdoor should be prohibited to use the clamp-on ammeter for measurement.
