Standards /radio transmitters
Which standards cover the requirements for harmonics- and spurious signals from radio transmitters ? Thanks, Amund
Neutral fusing.
Can anyone clarify the requirements regarding the fusing of both line and neutral supply conductors? It seems that where ( 230V) equipment is powered from a supply where the neutral is connected to earth then a fuse should not be fitted in the neutral. This is the situation in Europe. In the US this equipment may be powered from a 208V supply which does not earth the neutral (often the situation in labs). Should both line and neutral be fused in this case? Appreciate any comments, Philip Tatterton
Australia Accredited Test Lab
Hi! All, Would like to find out whether there's any Australia accredited test lab in South Korea that can conduct testing to AS/NZS3548 or CISPR 22. Reply with name of test lab, address, contact number will be appreciated. Thanks in advance. Regards. Loh Weng Wah Creative Technology Ltd. E-mail : ww...@cthost.ct.creaf.com
Re: How long for continuous?
Rich, You mean after all this time it has never occurred to any of us to raise this question? As a practical application, I would peg the fuse at less than 240 VA, so that it would trip below the 240 VA level. However, your question is how to measure the 'continuous'! For that matter, if the power level is not continuous but intermittent, does this mean that it's O.K. even if the limit is exceeded Tania Grant, Octel Communications Corporation tania.gr...@octel.com __ Reply Separator _ Subject: How long for continuous? Author: Rich Nute ri...@sdd.hp.com at P_Internet_mail List-Post: emc-pstc@listserv.ieee.org Date:11/12/96 4:46 PM Hello from San Diego: With regard to IEC 950: ... 1.2.8.7 HAZARDOUS ENERGY LEVEL: A stored energy level of 20 J or more, or an available continuous power level of 240 VA or more, at a potential of 2 V or more. ... At what point in time after start of the measurement is the available power considered continuous? In the application, a fuse is used to limit the continuous power to less than 240 VA. At 240 VA, the fuse WILL operate -- but it may take up to the maximum fuse operating time. Is this okay? If not, what is the time after which 240 VA is considered to be continuous? Best regards, Rich - Richard Nute Quality Department Hewlett-Packard Company Product Regulations Group San Diego Division (SDD) Tel : 619 655 3329 16399 West Bernardo Drive FAX : 619 655 4979 San Diego, California 92127 e-mail: ri...@sdd.hp.com -
How long for continuous?
Hello from San Diego: With regard to IEC 950: ... 1.2.8.7 HAZARDOUS ENERGY LEVEL: A stored energy level of 20 J or more, or an available continuous power level of 240 VA or more, at a potential of 2 V or more. ... At what point in time after start of the measurement is the available power considered continuous? In the application, a fuse is used to limit the continuous power to less than 240 VA. At 240 VA, the fuse WILL operate -- but it may take up to the maximum fuse operating time. Is this okay? If not, what is the time after which 240 VA is considered to be continuous? Best regards, Rich - Richard Nute Quality Department Hewlett-Packard Company Product Regulations Group San Diego Division (SDD) Tel : 619 655 3329 16399 West Bernardo Drive FAX : 619 655 4979 San Diego, California 92127 e-mail: ri...@sdd.hp.com -
Up-to-date standards
I am having difficulty keeping track of present and future standards, and would like people+s ideas. Some of my questions are: 1. We want to produce a written procedure indicating how we will know that standards we use are up-to-date and that we have all that are required. There are some subscription services which take a list of standards and provide updates as needed. Any other ideas? Anyone know some good web sites? (some have been mentioned, but not having web access at the time I didn+t save them.) Global Engineering has a World-Wide Standards Index, with a program to compare your list of standards and identify updates. ILI has a similar product (whoever they are.) St. Lucie Press, 561-274-9906, has a subscription service for European Directives which sounds pretty good. For US $95.00 per directive (or sometimes group of related directives) they+ll send you the current directive and place you on an order list for revisions. When a revision is made they send it to you and bill you $95.00. 2. The above will work for published standards. Any thoughts on how to identify/get drafts standards? I used to be on several standards writing committees, and word got around. I no longer have that access. 3. With many design engineers, one paper copy of each standard is very restrictive. Multiple copies are expensive. Electronic copies come in a bewildering variety of formats. Any suggestions concerning standards access? I+m primarily interested in: AAMI (medical equipment) CSA EC directives EMC (CISPR, EN, IEC) IEC/EN/ISO MIL UL
ITE standard used in Poland.
Hi Sandy: You ask: Does anyone know the ITE test standard requirements for Poland? Poland uses IEC 950. (And accepts CB Reports.) Polish certification of ITE is required. I believe the only country in the world that does not use an IEC 950 clone is Mexico. Mexico uses a UL 478 clone. Since IEC 950 largely includes UL 478 requirements, compliance with IEC 950 largely implies compliance with UL 478. Best regards, Rich - Richard Nute Quality Department Hewlett-Packard Company Product Regulations Group San Diego Division (SDD) Tel : 619 655 3329 16399 West Bernardo Drive FAX : 619 655 4979 San Diego, California 92127 e-mail: ri...@sdd.hp.com -
Re: standard requirements
Sandy, Recent TREG and emc-p...@ieee.org mail shows the following: Author: par...@bangate.compaq.com at P_Internet_mail Date:7/25/96 7:57 PM Priority: Normal BCC: Tania Grant at P_BSD TO: r...@ncgwpc.syntellect.com at P_Internet_Mail CC: emc-p...@ieee.org at P_Internet_Mail CC: t...@world.std.com at P_Internet_Mail Subject: re: Poland and Hungary, Regulatory Requirements --- Message Contents --- Hello Ron, Please let me answer at least some of your questions concerning Safety, EMC and PTT regulatory requirements in Poland and Hungary. 1. POLAND a) Polish Safety Standard: PN-93/T-42107 [IEC 950 (1991) + Amds. with minor deviations]. An outside CB Test Report will be accepted, but samples are required. Contact: Laboratorium Elektrotechniczne PCBC Mr. Wiktor Greviennikow ul. Klobucka 23A 02-699 Warszawa, Poland Phone: +48 22 47 99 16 Fax: +48 22 47 12 22 b) Polish EMC/RFI Standard: PN 89/E-06251. EMC/RFI test reports are only accepted from a PCBC accredited EMC lab. Contact: Laboratorium Badawcze ELTEST ul. Ratuszowa 11, Room No. 136 Warszawa, Poland Phone: +48 22 19 39 66 (Mr. Marek Jewtuch) or Phone: +48 22 18 99 92 (Mr. Edward Rudalski) c) Polish PTT approval: Contact: Institute of Telecommunications Mr. Tomasz Niewodniczanski ul. Kopernika 11 51-622 Wroclaw, Poland Phone: +48 71 72 88 12 Fax: +48 71 72 88 78 Author: Ray Russell ray_russ...@leco.com at P_Internet_mail Date:10/9/96 8:08 AM Priority: Normal BCC: Tania Grant at P_BSD TO: emc-p...@ieee.org at P_Internet_Mail TO: Brent Taira 72642.3...@compuserve.com at P_Internet_Mail Subject: Re: Poland Certification Message Contents- Dear Brent, As a former Compliance Engineer for a PC manufacturer, we found that Poland would accept EMI and a CB test report from NEMKO. If interested, you might contact: Morten Smith Phone 47 22 96 03 30 FAX 47 22 69 86 36. I hope this helps, Ray Russell I hope this helps you, Sandy. Please note that the ul. abreviation in the addresses does not stand for downsized UL but for 'ulitza', meaning 'street'. Tania Grant, Octel Communications Corporation tania.gr...@octel.com __ Reply Separator _ Subject: standard requirements Author: Sandy Florence-ESF003 sandy_florence-esf...@email.mot.com at P_Internet_mail List-Post: emc-pstc@listserv.ieee.org Date:11/12/96 10:27 AM Does anyone know the ITE test standard requirements for Poland ? Thanks. Sandy
