How can I measure the voltage and current with a clamp?
A table is for an electrical line measurement of the running current meter can measure the current in the energized condition. A table is actually a current transformer, the jammed wire is the equivalent of a transformer coil, when a current in a wire, will produce the magnetic flux in the iron core sheet, and then the table is two induces a current in the coil, the coil current is equal to a current multiplied by a coil in the the number of turns (or a wire, so it is a turn) turn number two divided by the coil, according to the relationship, it can be a current in a wire conversion.
Clamp meter with digital display and pointer display, measuring about estimated range of the measured current, pay attention to the selection of range clamp meter, try to choose the appropriate range to reduce the error. In addition to the wire clamp in the middle of the jaw clamp meter, if the measured current is too small, can take the form of a plurality of winding wires, and then measure the value by the number of roots, but also take care not to measure the bare wire, so as to avoid the risk of electric shock. If we can measure the voltage clamp and other functions of the table, when measuring the current to pull out test. Furthermore, in the three-phase load, the line of the jaw clamp measures the current of the wire, and the two measuring current is the third. When measuring the current voltage clamp meter should note 1, the measured line is lower than the rated voltage of the current clamp meter; 2, measurement of high voltage transmission lines, to wear insulated gloves, wear insulated shoes, stood on the insulating pad; 3, to close not charged for jaw closing range; 4, in the measurement of resistance before the tested circuit must be completely discharged, and completely isolated from the power supply circuit; 5, if the test pen or power adapter to replace the damaged power, must have the same model and the same electrical specification test pen and power adapter; 6, the electric energy consumption as the battery indicator instructions, do not use instruments. If you don't use it for long time, remove the battery after storage; 7, not in high temperature, high humidity, flammable and explosive and electromagnetic field to store or use clamp meter; 8, please use a damp cloth or cleaner clamp meter shell, do not use friction or solvent; 9, the instrument when wet please, drying and storage.
Using the method of measuring current clamp meter 1, before measuring clamp meter mechanical zero; 2, select the appropriate clamp meter range: from large to small range or see rating estimation; 3, when using the clamp meter minimum range measurement, the reading is not obvious, can be measured wire around a few turns the number of turns, turns to the jaw central subject is reading indication / full range X = partial x turns; 4, when measured, should make the measured conductor in the central and the jaw, jaw tight closing, in order to reduce the error; 5, after the measurement, to convert the clamp meter switch in the most in the range.
