The engineering general whystick with clamp current meter to measure the current without universal current meter to measure the current?
Because the universal table need to break the circuit, the two test series into the circuit to measure current. Moreover, the measurement of current is also very small, generally the largest 20A, can not meet the requirements of the project to measure current requirements, does not affect the line, fast, large range of requirements. So only the clamp current meter to measure the current of dozens or even hundreds of Engineering equipment.
Choose the euro watch, depending on the voltage level of the line, can not be less than the line voltage, nor can it be higher than the line voltage. The line below 380 volts can only be measured with a 500 volt trillion ohm meter. If the 2500 volt ohmmeter is used, the line will have an insulation breakdown. Conversely, the data measured on 10000 volt lines using a 500 volt trillion ohm meter are inaccurate.
1, clamp meter principle is through the current transformer primary current will be converted to the current two times larger and smaller, it can produce a variety of reading range, to meet different needs of a current measurement. Moreover, the operation is simple and safe. ,2, the multimeter to measure the current must be Multimeter in series in the circuit, the operation is not convenient, especially running and do not allow power equipment to measure the multimeter; alternating current file maximum range I see but 20A, the measurement range is limited; and the design capacity of the multimeter small, generally do not allow long time will work in the current file access circuit.3, the selection of mega ohm meter is generally determined according to the rated voltage level of the circuit tested. For example, the 380V circuit chooses the 500V ohm meter in accordance with the rated voltage of 0.5kV. 6kV circuits, we usually choose the 2500V trillion ohm table.
