Re: 60Hz in PC Monitor
Rick, Might the filtering of the 60Hz out of the power supplies be poor and worse as the CRTs warm up? Remember, they're cold when you move them elsewhere for a test. Alternatively, might the 60Hz fluorescent lighting falling on these monitors interact differently with the screen refreshing than on other monitors in such a way as to cause visual effects? Just thoughts. Look for the simple solutions before you blame the Martians. Dick Shultz On 6/1/99 12:09 PM rbus...@es.com rbus...@es.com said I have in my company, several people asking for help with swimming in their monitors. There systems are connected to a half wall (windows on top, power and heat on the bottom). The head is steam radiation via baseboard radiators. These monitors are NOT next to any known magnetic fields. I have verified that if the monitors are physically moved away from the wall/heater the noise diminishes. In the row of multiple cubicles only selective people have the problem (perhaps 3 out of 15 or so). The noise appears to be 60 Hz in nature although no color purity problems were noted. I'm assuming that I am now looking for magnetic fields, possibly from the electrical feed line, or could it be the radiators? Is it possible for these to be nodal or selective along a common wall? Has anyone else had similar problems? Would it make sense to obtain a meter to measure the magnetics? Any suggestions appreciated. Rick Busche Evans Sutherland rbus...@es.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Building Main Transformer causes Video Problems
John, Before he calls out the health squad, your friend might also check to see if a filter in the CRT power supply is failing. It's probably the most likely cause of the distortion and would be most noticable if the CRT is set at a 60Hz refresh rate. Just move the monitor to a different location to rule out external fields and then dig in. Dick Shultz On 3/22/99 6:12 PM Rich Nute ri...@sdd.hp.com said Hi John: He sees the video distorted and was wondering about any health risks. The first thing you should do is ascertain that the distortion is caused by an external source or an internal (to the monitor) source. It is possible that the degauss circuit has failed, in which case you will get a distortion that remains constant with position of the monitor. The cause of the distortion is likely to be the magnetic interference from the transformer. You can test for this by rotating the monitor (in which case the shape and color should change), and by moving the monitor further away from the transformer (in which case the shape and color should change and diminish). Note that a permanent magnet near the screen has a similar effect, but over a limited area. A good web site that cites magnetic exposure standards is: http://www.lessemf.com/standard.html 60-Hertz magnetic exposure limits range from 2.5 mG to 10 G, depending on the standard. There is little agreement as to both the effect on the body and the exposure limit. If you go to the home page, you will find some more (highly pessimistic) info and some good (not necessarily pessimistic) links. There is some data describing possible health risks, but remember that there is little substantial research in the effects of magnetic fields upon the body. Best regards, Rich - Richard Nute Product Safety Engineer Hewlett-Packard Company Product Regulations Group AiO Division Tel : +1 619 655 3329 Effective 6/12/99: +1 858 655 3329 16399 West Bernardo Drive FAX : +1 619 655 4979 Effective 6/12/99: +1 858 655 4979 San Diego, California 92127 e-mail: ri...@sdd.hp.com - - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: AC Adapters
Richard, Look here http://www.panelcomponents.com/guide/guide.htm for information on ac mains plugs/sockets. Dick Shultz On 3/18/99 12:32 PM WOODS, RICHARD wo...@sensormatic.com said To all of you who market equipment worldwide using AC adapters: 1. Is it true that plug adapters similar to those used by tourist are not legal in most countries? 2. How many different adapters are required to be stocked to handle the various requirements for plugs and safety approvals? 3. Would you please identify them by the countries that use them? Or, is there a good on-line source for this information? - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: C-Tick importer variation
Koh, You can continue to import product with the N555 code on it if your importer (N123) has a written agreement with importer N555 to do so. Your importer will need to maintain this letter in his files for ACA audits. I know that this has come up recently and that the ACA has accepted this procedure, in fact they have required it. Check with them. Dick Shultz On 3/2/99 8:36 AM WOODS, RICHARD wo...@sensormatic.com said OEM devices may be imported by more than one company. Each importer is responsible for filing their own application, having their own approval, applying the c-tick mark, and issuing a DoC. One importer cannot use the markings of another importer. Either the OEM or the importer may apply the label. Each importer can use the test data from the OEM. If the model number on the product differs from the one on the test report, the OEM should issue a declaration of identity stating that the two products are identical. -- From: kohscp [SMTP:koh...@cyberway.com.sg] Sent: Tuesday, March 02, 1999 12:08 AM To: emc-p...@ieee.org Subject: C-Tick importer variation Hi, I have a doubts here regarding the Australia EMC framework. Electronic products importing into AS/NZ requires to comply to EMI (emission) requirement and the respsonble party need to declare the DoC. He would need to hold the DoC with supporting documents. Test reports from recognise test house would be preferred. Let narrow down to the following assumption. The electronic product does not have connection to telephone network and no AC power input. The responsible party be an importer. And all products from my company is imported thru them. The test house is either NATA accredited or having MRA with NATA accreditation. The C-Tick mark is having supplier code used on the label. Now the situation is that our importer has registered with ACA(say having N123). We are purchasing/OEM products from supplier A. The supplier A is having their Australian importer (say N555) on the product label. What are my options for importing the product into AS/NZ in respect to which supplier code to use. Questions: 1) Are we allow to use N555? If yes, what documents, proof or/and letters do we need from the supplier? 2) Do our importer needs to declare the DoC? 3) If we are requesting the supplier to change the brandname on the product label, is N555 still applicable? How about change of model # too? 4) If we are to remove N555 on the product and use N123, is re-testing required? 5) If there's product non-conformance found in the market, who will be the responsible one? Who would be audited, and for worst case, who would be fine? Your feedback/advice is much appreciated. Regards Koh - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Optical Attenuators..
George, Try Edmund Scientific in NJ. They have lots of optics. You'll need to look them up on the web. Dick Shultz On 11/18/98 10:33 AM Sparacino,George sparaci...@andovercontrols.com said Greetings All, I'm looking for optical attenuators to use as a load to simulate maximum cable length during a UL864 test.. does anyone know where I can purchase these Thanks, George - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: French Labels
Jim, I have a copy of a glossy example of the label received from the DGPT, now ART, so such an item does exist. It specifies colors and content but no information on minimum size. The challenge will be to find out where you can get one. I got mine through our French consultant. You can look on www.telecom.gouv.fr/english.htm to find a 1996 document about the approval process in France. It contains information about labeling but no label spec. The ART maintains a web page at www.art-telecom.fr. Unfortunately, for me, it's in French so I can't tell you if it has what you want. The ART's main telephone number is +33 1 40 47 70 00. Good luck, Dick Shultz On 7/17/98 11:17 AM gr...@emg.sms.siemens.com gr...@emg.sms.siemens.com said Does anyone have a source where I can get detailed information on the construction of the French Telecom (AGREE)approval label? Thanks, Jim
Re: non CE upgrades in the EU
Richard, Per section 7.2.1.1 of the latest Guidelines on the Application of the EMC Directive you would only have to comply with the EMC directive if you were bringing the equipment up to as-new status. That is, if you made the equipment competitive with new devices used for the same purpose. Otherwise the updated old equipment could have a competitive advantage partly because it would not need to comply. This same section does, however, suggest that you be ready to justify your decision in case you're ever challenged. Dick Shultz Complinace Approvals Manager Brooktrout Technology, Inc. On 3/17/98 9:11 AM Richard Cass richard_c...@iris.scitex.com said: Greetings, We have a situation where we have ITE equipment installed at a commercial sites in the EU that were delivered before January 1, 1996. They do not carry the CE mark. We are now working on some field retrofitable design changes that can be installed in these old machines. The upgrade is done by a service engineer and mostly involves exchanging circuit boards. It will be economically impossible to make this upgrade of an old configuration machine meet standards that would apply to new products shipped to the EU today (e.g. EN50081 class B). My questions boil down to these: 1.) Given that the specific machine was already placed in service in the EU before 1/1/96, does this mean selling a customer this upgrade kit forces us to meet the latest standards and then CE mark the product? 2.) Does the upgrade kit (a bunch of loose boards that do not function outside our machine, other parts, and instructions in box) have to be CE marked? I am pretty certain that the answer to 2 is NO and I am fairly certain (which is less than pretty certain) that the answer to 1 is also NO. Can anyone help me substantiate these answers or correct me if I am wrong? Thanks in advance for the usual insightful responses. Regards, Richard Cass Iris Graphics Bedford,MA USA
