描述

1746-N2

七十年代以前，控制系统中采用模拟量对传输及控制信号进行转换、传递，其精度差、受干扰信号影响大，因而整个控制系统的控制效果及系统稳定性都很差。七十年代末，随着大规模集成电路的出现，微处理器技术得到很大发展。微处理器功能强、体积小、可靠性高、通过适当的接口电路用于控制系统，控制效果得到提高；但是尽管如此，还是属于集中式控制系统。随着过程控制技术、自动化仪表技术和计算机网络技术的成熟和发展，控制领域又发生了一次技术变革。这次变革使传统的控制系统（如集散控制系统）无论在结构上还是在性能上都发生了巨大的飞跃，这次变革的基础就是现场总线技术的产生。
现场总线是连接现场智能设备和自动化控制设备的双向串行、数字式、多节点通信网络，它也被称为现场底层设备控制网络（INFRANET）。80年代以来，各种现场总线技术开始出现，人们要求对传统的模拟仪表和控制系统变革的呼声也越来越高，从而使现场总线成为一次世界性的技术变革浪潮。美国仪表协会(ISA)于1984年开始制订现场总线标准，在欧洲有德国的PROFIBUS和法国的FIP等，各种现场总线标准陆续形成。其中主要的有：基金会现场总线FF（Foundation Fieldbus）、控制局域网络CAN（Controller Area Network）、局部操作网络LonWorks（Local Operating Network）、过程现场总线PROFIBUS（Process Field Bus）和HART协议(Highway Addressable Remote Transducer)等。但是，总线标准的制定工作并非一帆风顺，由于行业与地域发展等历史原因，加上各公司和企业集团受自身利益的驱使，致使现场总线的国际化标准工作进展缓慢。但是不论如何，制定单一的开放国际现场总线标准是发展的必然。

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主营DCS系统配件
机器人系统配件
大型伺服系统配件
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* Wild Heerbrugg T16 Theodolite New Style FPOR

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LEICA WILD HEERBRUGG

Wild Heerbrugg T16 Theodolite Made in Switzerland No Re

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WILD HEERBRUGG 1.0X AND WILD MPS12 MICROSCOPE Component

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HP Agilent E8408A VXI Mainframe + E8491B 89695B E1439A

ELGAR AT8000B PROGRAMMABLE DC POWER SYSTEM + SLAVE UNIT

HP Agilent 54845A Infinium Oscilloscope 1.5GHz 8GSa 4CH

R&S SSCU-55 / ROHDE SCHWARZ TS8950 SIGNAL CONDITIONING

TEKTRONIX / SONY MTG100 MPEG-2 TRANSPORT GENERATOR

HP Agilent 8702B Lightwave Component Analyzer 3 GHz

ANRITSU MP1702A ERROR DETECTOR, 10 GHz, 512 KBIT

K&E 71-1111 OPTICAL MICROMETER + 71-1014 JIG TRANSIT

LECROY LC334A DIGITAL OSCILLOSCOPE 500 MHz 2 GS/s 4ch

YOKOGAWA DL1640L DIGITAL OSCILLOSCOPE 200MHz, 200MS/s

MITUTOYO SERIES 137 139 140 TUBULAR MICROMETER 40-120″

HP Agilent 70905A 70902A 70900A & MF SPECTRUM ANALYZER

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WAVETEK 2520A SYNTHESIZED SIGNAL GENERATOR .2 – 2200MHz

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BRUEL & KJAER 2690 NEXUS CONDITIONING AMPLIFIER – 2CH

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BRUNSON 71 JIG 76 Telescopic 75H Optical Transit Square

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HP Agilent 8671B Synthesized CW Signal Generator 18 GHz

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Hughes 8010H Traveling Wave Tube Amplifier 4- 8 GHz TWT

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HP AGILENT 16700A Logic Analysis System *FULLY LOADED*

Hughes 8010H Traveling Wave Tube Amplifier 2- 4 GHz TWT

R&S SMHU 4.32 GHz Synthesized Signal Generator

ETS-Lindgren Holaday HI-4433-STE RF SURVEY METER KIT

MITUTOYO HEIGHTMATIC # 574-210 24″ / 600mm Digital Gage

INTEGRATED CONCEPTS IC-2000 PGA LEAD STRAIGHTENER 2020

LECROY 9430 150 MHz DIGITAL OSCILLOSCOPE 100 Ms/s

AGILENT HP N1025A 1GHz ACTIVE DIFFERENTIAL PROBE 1 GHz

AGILENT / HP E4406A VSA Transmitter Tester 4 GHz + BAF

PHILIPS (FLUKE) PM3585 / 60 LOGIC ANALYZER 64ch 200MHz

ROHDE SMHU 4.32 GHz SYNTHESIZED SIGNAL GENERATOR *R&S*

NOISECOM UFX9737 UFX SERIES 4 CH NOISE GENERATOR

HP 4333A DISTORTION ANALYZER

HP Agilent 4145A Semiconductor Paramter Analyzer DC M02

HP Agilent 75000 Series B E1301A VXI E1345 E1346 66201

HP Agilent 75000 Series B E1301A VXI w/ E1366A & E1326B

MAHR FEDERAL EMD-832-WI DIGITAL ELECTRONIC AMPLIFIER

FLUKE 5101A CALIBRATOR 50 Hz to 50 KHz

KIC SlimKic 2000 Thermal Temperature Profiler Card

KAVO EWL D-88299 MOTOR CONTROL + TYPE 950 SPINDLE PIECE

ANRITSU MG3671B Digital Modulation Signal Generator EXP
Expansion Units MG0301C, MG0303B, and MG0310A included!

HP Agilent 87406B Coaxial Matrix Switch DC – 20 GHz T24

MAURY MICROWAVE 7500 PRECISION CALIBRATION KIT X7500E
WR90 WAVEGUIDE 8.2 – 12.4 GHz (for ANRITSU / AGILENT)

ANRITSU / WILTRON MP1604A 50MHZ – 3GHZ PULSE GENERATOR

ANRITSU MN3650C DIGITAL MODULATOR 800MHz – 2.7 GHz

TEKTRONIX 7854 OSCILLOSCOPE w/ Opt 2D + AMP + TIME BASE

AEROFLEX / IFR / MARCONI 2024 SIGNAL GENERATOR *REPAIR*

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SYSTRON DONNER MODEL 110D PULSE GENERATOR 5 HZ – 50 MHZ

KAVO EWL D-7970 MOTOR CONTROL + TYPE 950 SPINDLE PIECE

MAURY MICROWAVE 7500 PRECISION CALIBRATION KIT X7500E
WR90 WAVEGUIDE 8.2 – 12.4 GHz (for ANRITSU / AGILENT)

R&S PSL 3 INDUSTRIAL CONTROLLER / ROHDE SCHWARZ TS8950

BIRD 8890-315 Coaxial Termination Resistor + Blower

FLUKE 192 SCOPEMETER 60 MHz 500 MS/s Oscilloscope 192A

AXCELIS / FUSION UV PROBE & METER MODEL # M150 / 200

ILX Lightwave Model LDT-5910B Temperature Controller

ROHDE & SCHWARZ NRVD DUAL POWER METER w/ OPT 01

TEKTRONIX 7854 OSCILLOSCOPE w/ Opt 2D + AMP + TIME BASE
4 Slot Module w/ Dual Trace 7A24 + 7A26 + 7B80 + 7B92A

TEKTRONIX DSA601A SIGNAL ANALYZER / OSCILLOSCOPE + AMPS

VAISALA HMI41 Indicator & HMP46 High Temperature Probe

Motorola PAA810-45-25L Amplifier, 800 MHz – 1 GHz, 10 W

LOT of MKS BARATRON 627A, MILLIPORE, and MYKROLIS Equip

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BRUNSON ALIGNMENT TELESCOPE COLLIMATOR

WAVETEK 30MS/s UNIVERSAL WAVEFORM GENERATOR MODEL # 39

OPHIR NOVA HANDHELD POWER METER SENSOR DISPLAY 1Z01500

AGILENT / HP 83000 VLSI PCB E2770-66501 B3420 E2770CB

AGILENT / HP 83000 VLSI PCB E2770-66501 B-3420 E2770CB

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AGILENT / HP 83000 VLSI E2755-66540P A-3343 66551 66541

AGILENT HP E4406A VSA Series Transmitter Tester 8ZE BAH

HP AGILENT 11583C COAXIAL ATTENUATOR SET 3 6 10 & 20 dB

Wild Heerbrugg T2000 LEICA Theomat Theodolite Surveyor

LAMBDA LLS-9120 DC POWER SUPPLY LLS9120 0 – 120V / 7A

Eaton 15100B 500-1000MHz 40W RF Amplifier
Tested & Fully Operational w/ 7 Day Warranty!!

ROCKWELL CM200 MODULATOR MODEL CS03-D100-001

MITUTOYO Series 515 515-310 Height Master Gage 12.5″

AGILENT HP 85024A High Frequency Probe 300 KHz – 3 GHz

HP Agilent 8647A Signal Generator 250KHz – 1GHz Opt 1E5

CLAVIS ICH-6105 HAND HELD BELT TENSION METER

SORENSEN DCR60-45B DC POWER SUPPLY 0-60V DC, 45A, 2700W

CLAVIS ICH-6105 HAND HELD BELT TENSION METER

ALCATEL ACT 200T ACT200T TURBO PUMP CONTROLLER

TEKTRONIX 7904A OSCILLOSCOPE MAINFRAME+AMP+TIME BASE
4 Slot Module with (x1) 7A19 + (x1) 7A26 + (x2) 7B80

W&T PENWALT ABSOLUTE PRESSURE GAUGE 61B-1A-0100 100psia
Wallace & Tiernan Differential Pressure Indicator 1000

LECROY 9420 350 MHz OSCILLOSCOPE – 2CH – 100MS/s

1746-N2

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