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Do You Know How to Test a Scale?

Views:151     Author:Site Editor     Publish Time: 2021-01-14      Origin:Site

 

The more complex the program, the higher the accuracy of the scale. How do we judge whether the scale is accurate?

 

 

67-2 weight measuring instrumen


How to Test the Scale?


If we are using a weighing scale that does not require high precision, we can use an object of known weight to test the digital weighing scale. Weights are a typical example. Although the weight is not accurate enough or sufficient, it is sufficient for these purposes.

 

The test environment of the digital scale has additional requirements. The accurate weighing scale must be tested on a flat surface. First we need to set the scale so that it reads zero. For manual scales, we may need to turn wheels or screws to adjust the reading. After the device reads zero, an object with a known weight will be placed on the scale.

 

If the reading is not correct, please adjust the accurate weight scale to obtain the correct weight of the object. Digital scales may have calibration functions that allow adjustment of the reading. If your mechanical weighing scale does not provide any calibration options, you can still use the scale. However, you must compensate for the measured weight by using error factor correction.

 

Besides, it is necessary to repeat the test several times to confirm the accuracy of the scale. Whether the evaluation result of the high-precision scale is the same or almost the same. If the readings differ greatly, the accuracy of the scale is low.

 

When using any electronic weight machine in a production environment, there is usually no need to consider these issues. However, if you have always thought that your scale gives very strange readings, then you will at least want to consider them.

 

 

67-1 personal weighing scale


Testing Precision Equipment


Weight measuring scales used in science, engineering, manufacturing and similar types of operations usually require extremely high precision. For this type of test, we must use certified calibration weights instead of more common objects such as dumbbells.

 

First, we need to clear the weight measuring instrument according to the above process. Then we start measuring the weights to see if they consistently produce the same results, because this will test accuracy.

 

Weighing calibration weights in different combinations can improve the accuracy and correctness of the test. Then we check whether the result represents the correct sum of weighted objects. It should be noted that you are required to perform high-precision scale testing in a temperature-controlled room. For some personal weighing scales, the internal temperature of the device is also important.

 

In addition, weighing equipment may be sensitive to static electricity, radio frequency or electromagnetic interference. The term "drift" describes errors caused by environmental factors such as temperature and static electricity. For equipment used under conditions where these variables cannot be controlled, it is necessary to measure the sensitivity drift of the scale.

 

In some cases, manufacturers provide their equipment with temperature ranges and calibration certificates. Please note that if the equipment comes from a remote place, the calibration certificate may be invalid. Because for equipment that requires high precision, even the difference in geomagnetism and air pressure will cause measurement differences compared to the equipment calibration position.

 

 

The frequency of calibration will depend on the importance of accuracy to operation. Some organizations may recalibrate the weighing system every month. Others test at the beginning of each shift or before each use of the equipment.


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