How to Install Ferrite Noise-Suppression Devices
Contents
1. INSTRUMENTS The Software is the Instrument Pitcrrume Installation Guide How to Install Ferrite Noise Suppression Devices This guide describes how to install a simple snap on noise suppression device called a ferrite onto your interface cables to attain a desired level of electromagnetic compatibility EMC Introduction To ensure that your National Instruments hardware meets all EMC standards applicable to your country you need to install ferrites onto the external cables of some instrumentation systems Ferrites reduce unwanted electromagnetic noise your National Instruments hardware emits or receives Ferrites have little or no effect upon the operation of your National Instruments hardware However failing to use them as directed in this guide could be a violation of national EMC standards and or laws such as those of the Federal Communications Commission USA Department of Communications Industry Canada CENELEC European Union or Voluntary Control Council for Interference Japan Every National Instruments hardware product includes a Declaration of Conformity that lists the equipment or steps required for the product to conform to the EMC standards of the European Union known as the CE mark These requirements usually apply to other national standards as well If you are using more than one piece of National Instruments hardware check the Declaration of Conformity for each piece to determine which cable requires a ferr2. ite What You Need to Get Started J Your National Instruments hardware installed J The cables indicated on the Declaration of Conformity for your National Instruments hardware la The ferrite or ferrites appropriate for your system configuration Product and company names are trademarks or trade names of their respective companies 321221A 01 1996 National Instruments Corporation All rights reserved March 1996 Ferrite Installation Your National Instruments hardware should already be installed and the external cables connected to it according to the instructions in your hardware installation guide getting started manual or user manual Power to the National Instruments hardware should be off while installing ferrites on your external cables To install the ferrite snap it closed as shown in Figure 1 around your interface cable as close as possible to where the interface cable plugs into the hardware Placing the ferrite elsewhere on the cable noticeably impairs its effectiveness a Open Ferrite b Closed Ferrite Figure 1 Snapping the Ferrite Closed Refer to the following figures for examples of how to install ferrites on various types of cables 1 National Instruments Hardware 3 Ribbon Cable 2 Ferrite 4 O Connector Figure 2 Ferrite Installation for an Instrumentation System with a Ribbon Cable 1 Natio
3. nal Instruments Hardware 3 Shielded Round Cable 2 Ferrite 4 I O Connector Figure 3 Ferrite Installation for an Instrumentation System with a Shielded Round Cable You would install the ferrite as shown in Figure 3 onto various types of external cables such as the VXIpc 850 external SCSI and Ethernet cables the serial cable for the AT Serial board or the GPIB ENET 10BaseT cable Figure 4 shows an example of a configuration that requires ferrites on more than one cable connected to a single piece of hardware ETHERNET IEEE 488 Controller GPIB ENET NATIONAL INSTRUMENTS 1 Ethernet Cable 2 Ferrites 3 Coaxial Connectors Figure 4 Ferrites Installed on the GPIB ENET Ethernet Cables
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