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可以通过以下几方面的比较，挑选到适合的产品。
这一点尤为重要。在自动控制系统设计之初，就应该对控制点数（数字量及模拟量）有一个准确的统计，这往往是选择PLC的首要条件，一般选择比控制点数多10%~30%的PLC。这有几方面的考虑：
1、可以弥补设计过程中遗漏的点；
2、能够保证在运行过程中个别点有故障时，可以有替代点；
3、将来增加点数的需要。
工作环境是PLC工作的硬性指标。自控系统将人们从繁忙的工作和恶劣的环境中解脱出来，就要求自控系统能够适应复杂的环境，诸如温度、湿度、噪音、信号屏蔽、工作电压等，各款PLC不尽相同。一定要选择适应实际工作环境的产品。
Tektronix PG 506 Calibration Generator
Tektronix VX4234 4.5 digit Multi Meter
Tektronix VX4355 Relay Sitching Module
Tektronix VX4385 Matrix Switch Module
Tektronix P6249 4 GHz Active Probe
Expedited shipping available
Tektronix / TEK DAS 9100 Digital Analysis System +
Tektronix TDS 220 Two Ch Digital Real Time Oscilloscope
Expedited shipping available
Tektronix P6702 500MHz, 1300nm O/E Converter
Expedited shipping available
Tektronix, TDS 420 Four Channel Digitizing Oscilloscope
Tek 178 tektronix ic test fixture 577 Curve Tracer Plug
Qty2-Tektronix P6020 Current Probe + Termination TESTED
tektronix p 6015a nib with option 1 r
TEKTRONIX 1740A / 760A Combo TEK
Tektronix 2220 60 MHz Digital Storage Oscilloscope
Expedited shipping available
TEKTRONIX 7904A OSCILLOSCOPE MAINFRAME+AMP+TIME BASE
4 Slot Module with (x1) 7A19 + (x1) 7A26 + (x2) 7B80
Tektronix VX4790A Arbitrary Waveform Generator Arb VXI
Expedited shipping available
Tektronix WFM 90 Handheld Waveform Monitor + ACCESSORIE
Tektronix 1503B Metallic TDR Cable Tester
Expedited shipping available
Tektronix OF152 1300nm Multimode TDR reflectometer
Tektronix 11401 500MHz Oscilloscope w/11A33,11A34,11A71
Includes (2) Tek P6139A 10X Probes
One-day shipping available
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Tektronix 1765 & WFM 601 Vector Waveform Monitors
One-day shipping available
BNC Light Pulse Generator 6030 Ortec LeCroy Tektronix
TEKTRONIX 2465B 400MHZ OSCILLOSCOPE OPTION 22
Tektronix P6247 1GHz Differential Probe Test
Tektronix AM 503B current probe amplifier
Tektronix Sony AFG310 arbitrary function generator
Tektronix Sony AFG310 arbitrary function generator
Pallet Lot of Tektronix Curve Tracers 575 576 577
Tektronix 2215 Oscilloscope - LOT OF 10 - Parts/Repair
Tektronix 1750A NTSC Waveform Monitor
Tektronics TDS 220 Digital Real-Time Oscilloscope
Tektronix TLA704 Logic Analyzer with TLA7L3 LA Module
Tektronix TDS210 60MHz Digital Oscilloscope
Tektronix TSG-95 NTSC SIGNAL GENERATOR WITH CHARGER
Includes Fresh Calibration and Warranty
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Tektronix 2232 dig. storage scope, NISTcertified, man'l
additional free NIST recalibration within one year
TEK 577 Curve Tracer
Tektronix TekScope THS720STD 100MHz Oscilloscope THS720
@CALIBRATED@SALE@100 MHz/ DIMM/ 500 MS/s@90DayWarranty@
TEKTRONIX TM502A AM503B CURRENT AMPLIFIER
TEKTRONIX A6303 OSCILLOSCOPE CURRENT PROBE 15MHZ 500A
TEKTRONIX AM5030 PROGRAMMABLE AMPLIFIER AM 5030 OPT 96