描述
浮地方式、直接接地方式和电容接地三种方式。对PLC控制系统而言，它属高速低电平控制装置，应采用直接接地方式。由于信号电缆分布电容和输入装置滤波等的影响，装置之间的信号交换频率一般都低于1MHz，所以PLC控制系统接地线采用一点接地和串联一点接地方式。集中布置的PLC系统适于并联一点接地方式，各装置的柜体中心接地点以单独的接地线引向接地极。
TEK Tektronix gigaBERT 1400 generator & receiver
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Tektronix TDS784D Digital Oscilloscope 4 Ch 1 GHz
TEKTRONIX TDS794D/13/1F/2F/HD O’scope, 2 GHz, 4 Ch
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Tektronix: 2510 Wave Analyzer w/25AA2 & 25AA1 Options
TEKTRONIX TDS540C DIGITAL OSCILLOSCOPE
Tektronix TDS784D 4Ch, 1GHz , 4GSa/sec Digital Oscillos
option:5,13, 1F, 2F,2M,HD
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Tektronix 1103 Power Supply + P6703 O/E Converters
Tektronix PQA300 Picture Quality Analysis System
