DC ring standard test block(Type B test block for magnetic flaw detector) For DC and three-phase full wave Type B test block (also known as 12-hole DC test ring) is used to verify the comprehensive properties of magnetic powder when the magnetizing current is direct current or three-phase full wave currentCentrale gat: diameter 31,8 mm Kunstmatige defect diameter: diameter 1,78 mm Oppervlakte afstand: 1,78 mm-21,34 mm
De diameter van het gaatje en de grootte van het middelpunt van het gaatje vanaf de buitenste rand:
| Hool | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diameter per inch | 1.8 inch (alle gaten) | |||||||||||
| Afstand van gat en rand / inch | 1.8 | 3.6 | 5.4 | 7.2 | 9 | 10.8 | 12.6 | 14.4 | 16.2 | 18 | 19.8 | 21.6 |