VLT5032PT5C20STR0D0F00A00C0
：（同号）/，
公司销售的进口备件从国外生产厂家直接进货，
实行扁平化的销售模式，给客户节约了时间和成本。
我们的目标就是国内用户采购国外备件遇到困难和疑难时都能找到我们。
我们能够及时地报出优惠的价格和迅捷的交货期；国内用户采购国外备件受到*代理垄断价格时，
我们会给用户提供一个比较的机会，并且为客户提供解决方案。由于我们的订单集中，订货量大，
因此我们能提供颇具竞争力的价格并能够迅速交货，我们*以来致力于解决国内用户采购国外备件中的疑难问题，
并为广大用户提供电气及工控自动化成套设备的购销、现场调试等全面周到的服务。
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*种模拟/数字布局是通过模拟部分连接数字部分的5V和接地端。在这种配置下，LED的大电流、电机的切换和数字控制器的噪声覆盖在敏感的模拟电源和接地路径之上（见图6a）。PCB走线上的噪声路径就是与走线阻抗和电感相互作用的电源和接地电流。这引起电路模拟部分的电源和接地的AC偏移。迅速解决这个题目的方案是把电源和接地走线重新布局，以便模拟和数字走线各自独立，再一起连到一个中心位置。在这个中心位置上，把它们连接起来（见图6b）。这种策略利用了走线阻抗、电感和旁路电容器，在电源和接地走线上建立了RC和LC低通滤波器。这样进一步把设计中的敏感部分与噪声隔开。VLT5032PT5C20STR0D0F00A00C0
需要考虑的主要辐射噪声是LED走线（它携带大电流）、RS-232接口中的电荷泵（它能够吸收一定的电流），以及来自微控制器的I/O（具有快速上升时间）。LED和RS-232的驱动器走线会把噪声电感耦合到紧贴电路板的邻近走线上。这种耦合作用的表现即为电压噪声。来自微控制器的快速上升时间信号电容耦合到高阻抗且敏感的走线上。假如走线过于紧密，这种耦合作用就会表现为电流噪声。
假如在电路布局中考虑了这些因素，从噪声数字部分到敏感的模拟部分的噪声耦合就会减少。这个新布局的模拟电路保持不变，大多数数字电路的布局也同样如此。区别在于现在LED走线是绕过模拟电路而非穿过。RS-232接口的电源和接地也与电路板上敏感的模拟和数字功能分隔开。图6b的电源和接地策略可用于指导布局。
结语
抑制模拟噪声的*步是选择低噪声模拟元件。可以用滤波器消除信号和电源中的噪声。还应该适当使用膺频滤波器。在电源母线中，必要时可使用旁路电容器和电感线圈。同时，要利用接地层。
当添加数字电路时，要为整个电路制定一个接地和电源策略。需要结合穿过各个路径的电流密度来考虑走线的阻抗和电感。合成布局的目标是zui大限度地减少路径噪声，例如走线之间耦合的电容和电感，同时利用走线的电感和阻抗与旁路电容器一道，减少并隔离噪声。
Bussmann CHCC Fuse Holder 600V 30A 1P (Black Face, Indicator Light)
Orix MD825BM-12 Brushless Fan
Sprague EE-1300 Capacitor 50V (Box of 3)
Hottwatt Heater Cartridge 100W 220V
Markem 0230360 Heater Cartridge 240W 230V
Chromalox C303 Heating Element 120W 240V
GE 178-H Heating Element 350W 115V
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Vulcan 938053 Thunderbolt T8 Heater Cartridge 180W 240V
ITT Vulcan 938053 Heater Cartridge 180W 240V 4TB 1HDD
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Area Lighting Research AT-20 Photocontrol Photoelectric Switch
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GMB U-Joint
GE 60 Amp Circuit Breaker 120/240V 2P
GE RT-2937 Circuit Breaker 240V 60A 2P
Square D QOB260 120/240V 60A 2P 10Ka
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Square D QO250 Circuit Breaker 120/240V 50A 2P (Black Lettering,Black Numbering)
Square D QOB250 Circuit Breaker 120/240V 50A 2P (Black Lettering, Black Numbers)
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Idec RY2S Relay 3A 120V with Idec SY2S-05 Relay Socket 7A 300V
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Square D EHB14020 Circuit Breaker 277 VAC 1P 20A
Quam 8C10CO/B25/W 8" Extended Response Loudspeaker
Woodhead 891L Connector Plug 125V 20A
Bernstein GC-PNP AHST Limit Switch
Creform YK200U Bolt-On Fixed Caster with 200 x 42mm Polyurethane Wheel
GE CR123C1.09A Overload Relay Heater Element
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3M 34-8704-5439-3 Cable Cleaning Preparation Kit CC-2
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GE BCLF10 Auxiliary Contact 600V 10A Mod. 1
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McMaster Carr RPK-GR250-20107 Lip Seal
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Balluff C0BEL00VY050M Sensor Cable
