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中央穴:直径 31.8mm 人工欠陥直径:直径 1.78mm 表面距離: 1.78mm-21.34mm
穴の直径と穴の中央の大きさは外縁から:
| 穴 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 直径/インチ | 1.8インチ (すべての穴) | |||||||||||
| 穴と縁の距離 / インチ | 1.8 | 3.6 | 5.4 | 7.2 | 9 | 10.8 | 12.6 | 14.4 | 16.2 | 18 | 19.8 | 21.6 |