What is the structure of a clamp-on ammeter?
Clamp meter is usually used as an AC ammeter, there is a clamp head on its head, when measuring the current, the clamp meter does not need to be connected with the circuit to be measured, only the power supply wire (only one) through the jaws, you can directly carry out the measurement of current.
It is mainly composed of clamp head, clamp head trigger, hold button, function knob, LCD display, meter pen jack and red and black pens. The clamp head is used to clamp the wire to measure current, and the red and black pens are mainly used to connect the clamp meter to measure resistance and voltage.
Clamp head is mainly used to clamp the measured wire when measuring AC current, using the current transformer principle to sense the wire current.
Clamp head trigger is mainly used to open and close the clamp head, when pressed the clamp head is open, when released the clamp head is closed.
The hold button is mainly used to keep the measured data when detecting electronic circuits, in order to facilitate the reading of recorded data.
Function knob is mainly for the characteristics of the clamp meter multi-purpose, for different testing to set the corresponding range.
The LCD display is mainly used for displaying test data, data unit, selecting range and other information.
Meter pen jack is mainly used for connecting the lead plug of the meter pen and insulation test accessories. The red pen is connected to the VΩ jack, and the black pen is connected to the ground terminal.
Clamp AC ammeter is essentially by a current transformer and a rectifier system instrumentation is composed of the measured current-carrying wire is equivalent to the original winding of the current transformer, in the core of the current transformer is the secondary side of the winding, the secondary side of the winding and the rectifier system instrumentation connected. According to the original current transformer, vice winding between certain changes in proportionality, the rectifier system instrumentation will be able to display the current value of the measured line.
Clamp AC and DC meter is an electromagnetic instrument, placed in the jaws of the measured current-carrying wire as the excitation coil, magnetic flux in the core to form a circuit, electromagnetic measurement mechanism is located in the middle of the core notch, by the action of the magnetic field and the deflection, to obtain readings. Since its deflection is not affected by the measuring current, it can measure AC and DC currents.
