How to select a pointer multimeter?

Last Update Time: 2019-02-12 16:42:48

The pointer multimeter is an instrument for measuring the electrical parameters of a variety of components. The following problems should be grasped when selecting an pointer multimeter.

 

     1. Accuracy selection

The higher the accuracy of the meter, the more accurate the measurement, but the higher the price. Therefore, when selecting multimeter, we should select a multimeter with proper accuracy according to the requirement of measuring precision, so as to ensure that the measurement error is limited to the allowable range.

 

2.The pointer multimeter selected by external factors is small.

When the change of external factors, such as temperature and external magnetic field, exceeds the conditions prescribed by the multimeter, the smaller the change of indicator value is, the better.

 

3. Sensitivity selection

 Sensitivity refers to the degree of display of the instrument to the small variables to be measured or the ability to measure the small variables. The sensitivity of a multimeter is usually expressed in terms of the current (full current) required for the pointer to deflect. The smaller the full current, the greater the pointer deflection angle caused by unit current and the higher the sensitivity. With high sensitivity, it is necessary for various precise measurements. This should be noted in particular when selecting a multimeter.

 

4. Should have good damping property when the instrument is measured

The pointer will not stop at the indicating position because of the influence of inertia during the deflection process, and the swing of the pointer in the indicating position will have an effect on the measurement. This requires that the movable part of the instrument can be quickly stopped in the stable deflection position in the measurement, that is, the shorter the time required for the moving part to stop in the equilibrium position, the better.

 

 5. The overload of the instrument

When the value of current exceeds the rated value of the meter, it shall be called the overload of the instrument. With the exception of some special instruments, the general instrument should be able to withstand short-term overload capacity. This should also be borne in mind when selecting a multimeter.



 This article is from Allicdata Electronics. Reprinted need to indicate the source.