There are couplers available from a number of manufacturers; however, none work at data rates much above 100kHz. For that reason, the current draft of 61000-4-5 revision 2 (not yet circulated) inlcudes the following -- keep in mind, it is an EARLY draft, but it will appear in a CD by the end of this year but with some clarification added regarding systems where disabling a port shuts down a system:
Because of physical constraints, most coupling/decoupling networks are limited to handling data rates of up to about 100kHz. In cases where no adequate coupling/decoupling network is commercially available, surges shall be applied to the high-speed communication data port directly. First the port is determined to be functional, data lines are then removed, and the surge applied. After the surge, the data port must be re-tested to insure functionality. The EUT should be functional during the surge test with the port disconnected. The coupling method shall be selected as a function of the circuits and operational conditions. This has to be specified in the product specification. High speed communication lines such as ISDN or xDSL require low impedance in the decoupling network path in order to operate and an example of a suitable coupling/decoupling network is given in figure 13. This will only work for the 1.2/50us combination wave since the inductors will likely saturate with the longer 10/700us telecom waveform. The coupling/decoupling network referred to in a figure 3 is from an ETSI standard, but keep in mind, it will only work with very well balanced lines and with the 1.2/50us wave -- most telecom requirements for IEC specify using a 10/700us waveform. Best Regards, Michael Hopkins Manager, EMC Technologies Thermo Electron Control Technology Division EMC & ESD Simulation Solutions One Lowell Research Center Lowell, MA 01852 Tel: +1 978 275 0800 ext. 334 Fax: +1 978 275 0850 [email protected] One Thermo, committed to integrity, intensity, innovation & involvement From: Konrad Stefanski [mailto:[email protected]] Sent: Friday, September 19, 2003 3:20 AM To: [email protected] Subject: SURGE testing, disturb. meas. Hello list. What is the simplest way to couple Surge pulses (EN 61000-4-5) with telecomunication lines? I haven't got proffesional coupling network. And the second question, what is the simplest way to measure voltage of disturbances from telecomunication lines without proffesional ISN? Thank You for answers. Konrad Stefanski PCBC SA Warsaw [email protected]
