Linking method: Connect the electric needle instrument of plus or minus pole respectively on the needle handle, and exchange poles every time.
连接方法：将电针仪的正负极分别接在针柄上，每次将正负极交换连接。
Note that two two-pole relays are used to connect each diode to the Model 2400.
注意，使用了两组双刀继电器将每个二极管连接到2400。
Experiment is performed and the result shows that the sharp electrode is the best and power supply should connect the negative pole.
荷电电极接电源不同极性时荷电效果亦不同，接电源负极所能够达到的最大荷质比较大。
A small boy watched a telephone repairman climb up a pole, connect the test set and try the connection with the test board.
1个小男孩看到电话修理工爬到电线杆上，接好实验装配，试图接能测试板卡。
A small boy watched a telephone repairman climb up a pole, connect the test set and try the connection with the test board.
1个小男孩看到电话修理工爬到电线杆上，接好实验装配，试图接能测试板卡。
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