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外部设备是PLC系统不可分割的一部分，它有四大类
1.编程设备：有简易编程器和智能图形编程器，用于编程、对系统作一些设定、监控PLC及PLC所控制的系统的工作状况。编程器是PLC开发应用、监测运行、检查维护不可缺少的器件，但它不直接参与现场控制运行。
2.监控设备：有数据监视器和图形监视器。直接监视数据或通过画面监视数据。
3.存储设备：有存储卡、存储磁带、软磁盘或只读存储器，用于性地存储用户数据，使用户程序不丢失，如EPROM、EEPROM写入器等。
4.输入输出设备：用于接收信号或输出信号，一般有条码读人器，输入模拟量的电位器，打印机等。
TEKTRONIX 118-AS AUDIO DELAY SYNCHRONIZER
Tektronix TDS 210 TDS210 rack mounted scope, NIST-cal'd
additional free NIST recalibration within one year
Tektronix SD 32 50 GHz TDR Sampling Head
Tektronix TDS544A 500Mhz 4Ch 1GS/s Oscilloscope - Parts
TEKTRONIX 7A16A USPP 7A16A
Tektronix P7240 4Ghz Probe in box w/ ACCESSORIES nice
TEKTRONIX TLA 704 LOGIC ANALYZER WITH TLA 7L1
Tektronix P7260 GHz Active Probe TekConnect
TEKTRONIX 2465A or 2467 350MHz OSCILLOSCOPE cal+guarant
TEKTRONIX 2430A 150MHz OSCILLOSCOPE cal'd+FREE SHIPPING
TEKTRONIX 1740 WAVEFORM MONITOR / VECTORSCOPE
174-2117-01 Tektronix 24-Ch Data Probe 50-pin
Tektronix TM503 with DM501A, PS503A and DM502A
Chassis w/ 2 x Digital Multi-meters and a Power Supply
TEKTRONIX 2467 350 MHZ OSCILLOSCOPE w/probes&more stuff
NASA CALIBRATED - COMES WITH CART, PROBES, ETC.
TEKTRONIX SPG-422 Digital Sync w/Test Generator SPG422
TEKTRONIX R7704, 7A18, 7A22, 7B70 RACKMOUNT MAINFRAME
Tektronix 5441 50 MHz Storage Oscilliscope w/Plug-ins
One-day shipping available
Tektronix 1503C Portable MTDR Cable Tester "NICE"
TEKTRONIX TEKCONNECT O/E ADAPTER * CSA7404 * CSA7154
TEKTRONIX 2247A 100MHz OSCILLOSCOPE calibrated + guaran
One-day shipping available
Tektronix 2465A Oscilloscope
Tektronix WFM90 NTSC Waveform/Vectorscope
30-day warranty/14-day right of return
TEKTRONIX P6201 FET ACTIVE PROBE 900MHZ
Tektronix DSA602/4C Signal Analyzer
Tektronix 11802 Digital Sampling Oscilloscope
Tektronix VX4237 multimeter - VXI card
Expedited shipping available
Tektronix P6217 4 GHz Active Probe
Tektronix VS211 PAL Video Synchronizer
30-day warranty/14-day right of return
Tektronix P7240 Active Probe; 4 GHZ BW, 2.0V DYNAMIC R
Tektronix P7260 ACTIVE PROBE; 6.0 GHZ, 5X/25X, 1.5/6V
TEKTRONIX 11A81 3 GHz SINGLE CHANNEL AMPLIFIER PLUG-IN
TEKTRONIX J17 LUMACOLOR PHOTOMETER WITH OPTIONAL J1811
Tektronix 555 Oscilloscope Dual Beam Serial #010281
Tektronix 1780R Video Measurement Set, NTSC
Calibrated, 30-day warranty/14-day right of return
TEKTRONIX A6303 CURRENT PROBE
TEKTRONIX VX4802 DIGITAL I/O MODULE
Tektronix TEK TOP300 Fiber Optic Visual Fault Finder
Tektronix TDS1002 Digital Storage Oscilloscope w/probes
One-day shipping available
Tektronix 1910 NTSC TV Digital Generator
Tektronix THS720 100 MHz Digital Real-Time Oscilloscope
TEKTRONIX TLA7M4-1S 2 GHZ LOGIC ANALYZER TLA704 TLA711
Tektronix AM503B AC/DC Current Probe Amplifier
TEKTRONIX TLA 704 LOGIC ANALYZER 714 CARD LOADED
Tektronix P6150 Passive Probe, DC to 9 GHz, Low Impedan
Tektronix 1721 PAL Vectorscope
Tektronix SD20 Loopthrough Sampling Head
TEKTRONIX VX4610 TEKTRONIX SDH/SONET GENERATOR RECEIVER