为保证PLC能在工业环境下可靠工作，在设计和生产过程中采取了一系列硬件和软件的抗干扰措施，主要有以下几个方面：隔离，这是抗干扰的主要措施。PLC的输人、输出接口电路一般采用光电耦合器来传递信号。这种光电隔离措施，使外部电路与内部电路之间避免了电的联系，可有效地抑制外部干扰源对PLC的影响，同时防止外部高电压串人，从而减少故障和误动作。滤波，这是抗干扰的另一个主要措施。在PLC的电源电路和输入/输出电路中设置了多种滤波电路，用以对高频干扰信号进行有效抑制。
Tektronix TDS 754C 500 MHz 2 GS/s Oscilloscope
Tektronix TDS 520A TDS520A scope, NIST-calibrated
additional free NIST recalibration within one year
Tektronix TDS 420A TDS420A scope, NIST-calibrated
additional free NIST recalibration within one year
Tektronix TVS625 VXI Waveform Analyzer *warranty*
TEKTRONIX 7612D PROGRAMMABLE DIGITIZER
Tektronix 2430A Digital Oscilloscope + 2402A Tekmate+++
Tektronix TDS 520B TDS520B digital scope, NISTcertified
additional free NIST recalibration within one year
TEK TDS754C 4CH COLOR DIGITAL OSCILLOSCOPE 2 GS/s DPO
Tektronix TDS3012B scope 100MHz, 1.25 GS/s sample rate
Include a 90 Day warranty
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Tektronix TDS 430A TDS430A scope, NIST-calibrated
additional free NIST recalibration within one year
Tektronix TDS 544A TDS544A oscilloscope, NIST-certified
additional free NIST recalibration within one year
Tektronix VX4101 DMM/Counter VXI Module
