How to auto discharge clamp current meter
Clamp ammeters referred to as clamp meter.The work is mainly composed of an electromagnetic current meter and bushing type current mutual inductor. Straight through current transformer core made of movable opening, and a clamp on ammeter, named. The utility model is a portable instrument which can directly measure the alternating current of the circuit without disconnecting the circuit, and is very convenient for use in the electrical overhaul, and is widely used.
The secondary winding clamp current meter straight through current transformer winding in the core and AC current meter is connected to the primary winding, it is measured through the wire transformer center. The knob is actually a range switch, the movable wrench role is part of the core and core transformer, so as to clamp people measured wire.When measuring the current, press the wrench, open the jaws, the measured current carrying wire in a bushing type current transformer, when measured in alternating current through the wire, flux of AC current induces a current in the transformer windings, the current through the coil of the electromagnetic current meter, the pointer has the deflection, the dial scale that the measured current value.Before measuring, check whether the indicator of current meter points to zero, otherwise mechanical zeroing should be carried out. Before measuring, should also check the opening and closing of the jaw, jaw for movable part freely and with close contact on both sides of the jaw. If there is oil and debris on the jaw, application of solvent wash; if there is rust, should gently wipe. Make sure that the jaws are tightly joined in order to reduce leakage flux and improve measurement accuracy.
The clamp type meter works like a transformer.A primary coil is a traverse through a clamp core, equivalent to the primary coil of a transformer with 1 turns, which is a step-up transformer. The two coil and the ammeter used for measurement constitute the two loop. When the wire is AC current through the coil, which is the alternating magnetic field, induction current is generated in the two loop, the size of the current and a current ratio, the equivalent of a number of turns and two coil inverse. The clamp type ammeter is used for measuring high current. If the current is not large enough, the primary wire can increase the number of turns through the clamp table and divide the measured current by the number of turns.
