Special Application of Clamp Ammeter
(1) When conducting measurements, pinch the wrench tightly with your hand to open it. The position of the measured current carrying wire should be placed in the middle of the clamp to prevent measurement errors. Then, release the wrench to close the iron core, and the meter head will have an indication.
(2) When measuring, it is necessary to first estimate the magnitude of the measured current or voltage, select an appropriate range or choose a larger range for measurement, and then reduce the range based on the magnitude of the measured current and voltage, so that the reading exceeds 1/2 of the scale, in order to obtain a more accurate reading.
(3) To ensure accurate readings, the two faces of the jaws should be well connected. If there is any noise, the jaws can be reopened and closed again. If the sound still exists, check if there is dirt on the joint surface. If there is dirt, it can be wiped clean with gasoline.
(4) When measuring the current of low-voltage fusible fuses or low-voltage busbars, adjacent phases should be isolated with insulation plates before measurement to prevent potential short circuits between phases when the jaws are opened.
(5) Some models of clamp type ammeters come with AC voltage scales, which should be measured separately when measuring current and voltage, and cannot be measured simultaneously.
(6) It cannot be used for high-voltage live measurement.
(7) After the measurement is completed, it is necessary to place the adjustment switch in the maximum current range position to avoid damage to the instrument due to unselected range in the next use.
(8) In order to obtain accurate readings when measuring currents below 5A, if conditions permit, the wire can be wound several more times and placed in the clamp for measurement. However, the actual current value should be the reading divided by the number of wires placed in the clamp.
