在交货前，每一个变频器必须通过严格的质检程序，如高温测试、满载测试等等。
Every converter is put through strict quality controls, such as high temperature tests and full load tests, before delivery.
据说他还对紧绷的弦，管子，贝壳和满载的船的固有振动频率进行了测试。
He is also reported to have experimented with the relationship between consonance and the natural frequencies of vibration of stretched strings, pipes, shells, and filled vessels.
通过实验测试，设计的灯丝电源在兼顾小型化的同时，满载效率达到92%。
Experimental test shows that the full load efficiency of the filament power supply can be up to 92% for the designed and manufactured compact circuit.
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