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6号机:31—25—7型,制造厂编号第37台,1972年8月安装时经水电局调度试验所测频,其结果如表所示:因第10压力级部份叶片切Ao型频率低于制造厂的建议数值(250周/秒),采用锉去叶顶减薄部份及打减荷孔调频,调正后该级切Ao型频率为250.4～262.4周/秒。频率分散率4.8%。认为用上述打减荷孔方法调频尚简单,且所得的频率在叶根安装质量较好时比较稳定。
6th machine: 31-25-7 type, No. 37 factory number, August 1972 installation by the hydropower dispatch test frequency measurement, the results shown in the table below: Because of the 10th pressure-level part of the blade cut Ao Type frequency is lower than the manufacturer’s recommended value (250 weeks / sec), using the file to reduce the thinning of the roof and knocking the hole FM, after adjusting the grade Ao-type frequency 250.4 ~ 262.4 weeks / sec. Frequency dispersion rate of 4.8%. It is considered that the FM method described above is still simple, and the obtained frequency is relatively stable when the root installation quality is good.