Illustration of how to use a clamp-on ammeter
1, first of all, correctly select the voltage level of the clamp-type ammeter, check whether its appearance is good insulation, whether there is no damage, whether the pointer is swinging flexibly, whether there is no corrosion of the jaws. Estimate the rated current according to the motor power to select the range of the meter.
2, in the use of clamp ammeter should be carefully read before the manual, to find out whether the AC or DC dual-use clamp meter.
3, due to the clamp ammeter itself is less accurate, in the measurement of small currents, the following method can be used: the first will be measured circuit of the wire around a few turns, and then put into the jaws of the clamp meter for measurement. At this point the current value indicated by the clamp meter is not the actual value of the measurement, the actual current should be the clamp meter reading divided by the number of turns of the wire winding.
4, the clamp meter jaws in the measurement of the closure should be tight, after the closure, such as murmurs, you can open the jaws to re-full a time, if the murmurs can not be eliminated, you should check the magnetic circuit of the joint surface is clean, there is dust and dirt should be wiped clean.
5, the clamp meter can only measure the current of a phase of the conductor each time, the measured wire should be placed in the centre of the clamp window, can not be multi-phase wire are clamped into the window measurement.
6, the measured circuit voltage can not exceed the value indicated on the clamp meter, otherwise it is easy to cause grounding accidents,
or cause the danger of electric shock.
7, measure the operating current of the running cage-type asynchronous motor. According to the size of the current, it can check and judge whether the working condition of the motor is normal or not, so as to ensure the safe operation of the motor and prolong its service life.
8,Measurement, you can measure each phase once, you can also measure the three-phase once, at this time the table figure should be zero, (because the three-phase current phase and zero), when there are two phase wires in the jaws, the table displays the value of the third-phase current value, through the measurement of the current of each phase can determine whether the motor overload phenomenon (measured current exceeds the value of the rated current), the motor internal or (other forms of energy into electrical energy device) power supply voltage problem, whether there is a problem with the power supply, or (other forms of energy into electrical energy device). (called power supply) power supply voltage is a problem, that is, three-phase current imbalance is more than 10% of the limit.
9, clamp meter measurement should be estimated before the size of the measured current, and then decide which range. If you can not estimate, you can first use the maximum range file and then change the appropriate smaller, in order to read accurately. Can not use a small current file to measure large currents. To prevent damage to the instrument.
