描述
1对1结构。1台仪表,1对传输线,单向传输1个信号。这种结构造成接线庞杂、工程周期长、安装费用高、维护困难。
可靠性差。模拟信号传输不仅精确度低,且易受干扰。为此采用各种措施提高抗干扰性和传输精确度,其结果是增加了成本。
ALLEN BRADLEY 592-A2NF SER. A 592A2NF NEW RELAY
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NARDA BROADBAND ISOTROPIC RADIATION MONITOR
GE TRANSFORMER 9T21B1004G02 5.00KVA 1PHASE 60HZ NIB
ALNOR COMPUFLOW MODEL 8575
ALLEN BRADLEY 1775-GA NEW IN BOX 1775GA
WARNER ELECTRIC 5371169029 NEW 5371-169-029
PACIFIC SCIENTIFIC 5345 SERVO CONTROLLER NEW 5345