Dick et al, EN 61326-1, like it's kin that came before, all have test definitions for I/O and power ports. You simply have a connector that implements both I/O and power, so you consider both test requirements, and you might have to seperate the lines to run the tests.
Your jack may be RJ-11 style, but it isn't telecom just because it *looks* like a telephone plug/jack. RS-232 isn't a telecom port either. So telecom isn't the right word to apply. You have a hybrid power and serial I/O port on your T&M product, that's all. The jack is probably a cheap but poor choice in that the misplugging a true telecom device, or telecom network, could occur. Unless the jack is keyed. We have a device that uses the RJ-45 jack that is common to Ethernet, but we switched to the keyed version to prevent the obvious misplugging into Ethernet devices or networks. You may want to run your own safety fault tests to see what happens if the power is shorted or crossed to the I/O lines. Serial lines themselves seldom cause emission problems, but they can carry common mode noise from the system onto the unshielded cable, or have immunity problems. It's hard to say what would happen without knowing more. Best Regards, Eric Lifsey Compliance Manager National Instruments Please respond to Dick Grobner <[email protected]> To: "IEEE EMC-PSTC E-Mail Forum (E-mail)" <[email protected]> cc: (bcc: Eric Lifsey/AUS/NIC) Subject: Telecom Ports Good Day Forum Members I have a very similar question that Barry Ma presented on 7-13. It regarded a Ethernet port on test equipment. His question was as follows: 1. A phone line port has to comply with related regulations in Telecom world. In my recollection, PC industry just added an Immunity requirement to the phone line port. (It is included in EN55024?) But Ethernet can be converted to phone line through an adapter. Is there a similar immunity requirement for the Ethernet port in test equipment? If not, should it be added to EN61326? My dilemma is that my company "inherited" a piece of equipment via an earlier acquisition. On this piece of equipment they incorporated an RJ-11 telecom jack. Over this jack they are running power (+12V & pwr gnd) from a remote battery pack and RS-232 (Tx & Rx)comm which terminates to a PC. Can anyone provide me with some insight with regards to EMI/RFI requirements and device safety (I have somewhat of a handle on the safety side - but welcome other opinions!). None of these four lines have any type of safety (over current/voltage) protection nor any EMI filtering, etc. If you can provide some insight or reference to required standards I would appreciate it!!!! Thank You (in advance) Dick Grobner Compliance Engineering Medical Graphics Corporation 350 Oak Grove Parkway St Paul, MN 55127 651-766-3395 651-484-8941 (fax) [email protected] ------------------------------------------- ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
