People's Republic of China Professional standard test block ZB Y232-84 ZB Y231-84 This standard is the standard of ultrasonic inspection probe product performance test method, suitable for the basic frequency of 1 ~ 5MHz straight probe, inclined probe, twin-crystal straight probe and water probe. 1., 1# Standard test block: Figure 3-12 shows the shape and size of the DB-P test block. Figure 3-2 shows the size and shape of the DB-P test block. 3. DB-H1 test blocks 4, DB-H2 test blocks 5, DB-D1a, and b have the same dimensions and shapes as shown in Figure 3-5. 6. DB-D2 test block size and