Function of clamp Ammeter- Clamp Ammeter reading
Function of clamp Ammeter
Clamp Ammeter is composed of current transformer and Ammeter. The iron core of the current transformer can be opened when the wrench is tightened; The wire through which the measured current passes can pass through the tested circuit wire of the iron core, which becomes the primary coil of the current transformer, and the current is induced in the secondary coil through the current.
Usually, when measuring the current with an ordinary Ammeter, the Ammeter can be connected for measurement only after the circuit is cut off and shut down, which is very troublesome, and sometimes it is not allowed to do so for a normal running motor. At this time, it is much more convenient to use the clamp Ammeter, which can measure the current without cutting off the circuit.
The clamp meter can be changed to different ranges by shifting the gears of the switch. However, it is not allowed to operate with power when shifting gears. The accuracy of clamp shaped watches is generally not high, usually ranging from 2.5 to 5 levels. For ease of use, there are also conversion switches with different ranges in the meter for measuring different levels of current and voltage.
The clamp meter was originally used to measure AC current., But now multimeter has some functions, such as measuring AC/DC voltage, current, capacitance, diodes, transistors, resistors, temperature, frequency, and so on.
Clamp Ammeter can measure photovoltaic DC current and inverter output AC current. Special attention should be paid to: some clamp Ammeter have no DC function, and the jaw should be closed tightly and can not change the range with electricity.
Clamp Ammeter reading
1. Select the gear and range. Turn the meter switch to the DC current "mA" position and select the correct range based on the measured current. To avoid excessive current exceeding the range without knowing the magnitude of the current, it is recommended to first place it in the highest DC current range for testing. If the range is too large, reduce the range again until it is suitable.
2. String in circuit. When measuring current with a multimeter, the probe must be connected in series with the current, with the red probe connected to the high potential end of the circuit and the black probe connected to the low potential end of the current.
3. Reading method:
(1) Correctly select scale marks for reading.
(2) Converted current value: current value=the number of degrees indicated by the pointer × Range size/maximum value of the selected scale.
