Dear Ladies and Gentlemen,
in this newsletter issue, we would like to grant a brief insight into the international standard for cable measurement IEC 60811-201* - in particular for the measurement of wall thicknesses.
These wall thicknesses are to be measured at different locations and with different numbers of walls depending on the shape of the given cross section. In our example, we have selected two cases, where the standard leaves plenty of room for misinterpretation and operator errors:
These two cases are described and displayed as the follwing in the standard:
Case 1: Six measurements shall be made radially, each approximately 60°
Source: Based on the representation in the standard IEC 60811-201
Case 2: Six measurements shall be made radially
Source: Based on the representation in the standard IEC 60811-201
In the images above, which are based on the displays in IEC 60811, the following is easily visible:
What influence does this have on conventional measuring methods, e.g. microscope or profile projector?
If the measurements are performed at exactly 60° distances and are only measured towards the centre, as it usually is with conventional methods, the following problems might arise:
To illustrate possible errors and problems resulting from the differences, we have a concrete measuring example:
Value „Minimum Wall“ directed towards the centre (radial) | Value „Minimum Wall“ according to IEC 60811 |
2.579 mm | 2.481 mm |
As you can see above, the values between these two types of minimum wall thickness are quite different. This can lead to quality issues. The measurements with images can be found here.
Our intelligent cable measuring system can help you perform standardized, operator-independent wall thickness measurements according to standards.
Further details about the difference between either strictly measured 60° thicknesses and local minima, as displayed in the standard we will illustrate in our next newsletter issue.
*Should you wish to purchase the standard for further research, here is one supplier.