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.
在系统回路中必须采用屏蔽信号电缆，并可靠接地。
Shielded signal cable must be used in system loop, and must be grounded firmly.
编码器头部的屏蔽和电缆类型决定了信号类型。
Encoder head shielding and cable type is determined by the signal type.
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