4 Accuracy Requirements for Clamp Ammeters
(1) For the digital clamp ammeter, although the battery power has been checked before use, you should always pay attention to the battery power during the measurement process. If the battery voltage is found to be insufficient (such as a low voltage prompt symbol), The measurement must be continued after the battery is replaced; if there is electromagnetic interference at the measurement site, it will inevitably interfere with the normal progress of the measurement, so try to eliminate the interference. Whether the measurement data can be read correctly is also directly related to the accuracy of the measurement.
(2) For the meter head of the pointer clamp meter, firstly, check the selected gear, and secondly, check which scale is used. When observing the scale value pointed by the hands of the watch, the eyes should face the hands and the scale directly to avoid strabismus and reduce parallax. Although the display of the digital meter is relatively intuitive, the effective viewing angle of the LCD screen is very limited. It is easy to read the wrong number when the eyes are too skewed. You should also pay attention to the decimal point and its position, which must not be ignored. .
(3) Abnormal or drastic changes in the temperature of the measurement site will affect the accuracy of the measurement. Because changes in temperature will increase the error of the meter, thereby reducing its accuracy. The main reason why the clamp ammeter is affected by temperature is that the temperature change changes the results of the material properties of the key structural parts of the meter. For example, after the ambient temperature changes, the elasticity of the hairspring that produces the reaction torque of the meter often changes, so that the value of the meter changes accordingly, and the magnetism of the first magnetic field that forms the magnetic field changes, so that the magnitude of the acting torque of the meter changes. . In addition, due to changes in ambient temperature, the resistance of the circuit that constitutes the instrument, as well as the parameters of various electronic components and semiconductor devices will change, and the final result will affect the accuracy of the measurement.
(4) During the measurement process, two or more wires cannot be clamped at the same time. When measuring a current less than 5A, in order to obtain a more accurate reading, if conditions permit, the wire can be wound several times and put into the jaw for measurement, but the actual current value should be the reading divided by the number of coils put into the jaw .
