Mechanical vibration—Rotor balancing—Part 21:Description and evaluation of balancing machines
GB/T 9239的本部分规定了通过下列试验对平衡旋转零部件用的平衡机性能的评定要求：
<br/> a) 最小可达剩余不平衡量试验，Umar试验；
<br/> b) 不平衡量减少率试验，URR试验；
<br/> c) 单面平衡机偶不平衡干扰试验；
<br/> d) 补偿器试验。
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