灯具测试链 Test chain: A chain of sufficient length of an uncoated metal, having links in accordance with Figure 29 and made of 63 % Cu/37 % Zn. The chain shall have a resistance value of 2,5 Ω/m ± 20 % when stretched with a load of 200 g/m.
测试链：具有符合图29规定的链环，未涂覆且长度足够的金属链由63%铜37%锌制成。当以200g/m的负载拉伸时，该链的阻值应为2.5Ω/m±20%。
Figure 29 – Test chain
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