unit. They shall be blasted or ground. In general a surface finish corresponding to reference a minimum from Ra 12.5μm (N10) as per ISO1302 is acceptable. In case a separate transmitter receiver probe is used, the surface finish shouldn’t be greater than Ra≤6.3μm.Р2.7 耦合剂 COUPLANTР甘油、ULTRAGEL高温耦合剂、金属专用浆糊、机油、水或相当的物质可作检查用耦合剂。校正与检验应使用相同的耦合剂。РGlycerin, Ultragel, Metal paste, Oil, Water, or equivalent, shall be used as couplant for these inspection. The same couplant shall be used for calibration and testing.Р2.8 距离和折射角校验 Distance Calibration and Check of Angle of RefractionР2.8.1 应根据ASTM E317校验仪器的垂直、水平和波幅线性。校验周期不超过一年。РEquipment shall be calibrated in accordance with ASTM E317 for screen height, horizontal and amplitude linearity. The calibrations shall be at a frequency not to exceed one year.
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