描述
PLC的输入与输出最好采用分开走线，开关量与模拟量也要分开敷设。模拟量信号的传送应采用屏蔽线，屏蔽层应一端或两端接地，接地电阻
电阻，物质对电流的阻碍作用就叫该物质的电阻。电阻小的物质称为电导体，简称导体。电阻大的物质称为电绝缘体，简称绝缘体。应小于屏蔽层电阻的1／10。
Tektronix TDS2014 Oscilloscope w/4 ea. NEW P2220 Probe
JUST CALIBRATED by TEKTRONIX on Mar-2011, CAL DUE 2012
Tektronix TekScope THS730A 200MHz Oscilloscope THS730
@CALIBRATED@SALE@200 MHz Scope/ DMM 1GS/s@90D Warranty@
Tektronix 2465A DM 350 MHz scope, NIST-certified
additional free NIST recalibration within one year
TEKTRONIX TDS340 DIGITAL OSCILLOSCOPE
Tektronix TDS 340A TDS340A digital scope, NISTcertified
additional free NIST recalibration within one year
TEKTRONIX SD-46 20 GHZ HEAD CSA803C 11801C ELECTRICAL
Tektronix 2465 DMS 300MHz analog oscilloscope
