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 current. Lubang pusat: diameter 31,8mm Cacat buatan diameter: diameter 1,78mm Jarak permukaan: 1,78mm-21,34mm
Diameter lubang dan ukuran pusat lubang dari tepi luar:
| Lubang | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diameter / inci | 1.8 inci (semua lubang) | |||||||||||
| Jarak lubang dan tepi / inci | 1.8 | 3.6 | 5.4 | 7.2 | 9 | 10.8 | 12.6 | 14.4 | 16.2 | 18 | 19.8 | 21.6 |