若开关、互连电缆和测试夹具没有合适的屏蔽，所产生的杂散信号（偏移）将威胁到被测信号。

Without proper shielding of the switches, interconnecting cables, and test fixturing, spurious signals (offsets) may be generated that will compromise the signal being measured.

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安装，检查，更换或修理电线，插座，开关箱，管道，馈线，光纤和同轴电缆组件，照明灯具和其他电器元件。

Install, examine, replace or repair electrical wiring, receptacles, switch boxes, conduits, feeders, fibre-optic and coaxial cable assemblies, lighting fixtures and other electrical components.

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在测试样板和7158型开关卡之间应该使用低噪声同轴电缆，以避免噪声电流。

Low noise coax cables should be used between the test coupons and the Model 7158 CARDS to avoid noise currents.

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