The standard is made of thirteen pairs of wires of different diameter, soldered into hard plastic at a certain distance from each other, corresponding to the diameter of each pair.
Wire pairs are numbered from 1D (a pair of wires with the largest diameter) to 13D. 1D - 3D made of tungsten, the rest - from platinum.
The level of unsharpness is determined by the number of pairs of wires that can be seen. The X-ray of the standard is examined by a magnifying glass with a maximum 4-fold magnification. With increasing blurriness, the wires merge into a single image. The value equal to the 2nd wire diameter of the element that is still distinguishable as double is taken as U - the value of the image blurriness. The number of this element is the number of unsharpness.
|
№ element |
Material |
Blurry |
The diameter of the wires and the distance between them, mm |
| 13D | platinum | 0.10 | 0.050 |
| 12D | platinum | 0.13 | 0.063 |
| 11D | platinum | 0.16 | 0.080 |
| 10D | platinum | 0.20 | 0.100 |
| 9D | platinum | 0.26 | 0.130 |
| 8D | platinum | 0.32 | 0.160 |
| 7D | platinum | 0.40 | 0.200 |
| 6D | platinum | 0.50 | 0.250 |
| 5D | platinum | 0.64 | 0.320 |
| 4D | platinum | 0.80 | 0.400 |
| 3D |
wolfram |
1.00 | 0.500 |
| 2D | wolfram | 1.26 | 0.630 |
| 1D | wolfram | 1.60 | 0.800 |
The standard is engraved with an individual serial number and comes with a quality certificate and instructions in a storage case.
The use of the Duplex IQI EN 462-5 standard has been approved by the European Technical Committee for Standardization CEN / TC 138.
