RE: Direct Contact Discharge into Vents to EN61000-4-2
Hi Bill, The procedure for testing to the E.S.D. Standard (EN61000-4-2:1995) is to start with contact discharge towards reachable metal surfaces. Contact discharge is the prefered method. Air discharges shall be used where contact discharges canot be applied. You only use the air discharge gun on plastic material. Generally there is no discharge on plastic thus the reason for a higher level for air discharge. Hope this helps, for it just my opinion -Original Message- From: Jacowleff, Bill [mailto:bjacowl...@vdo.com] Sent: Friday, September 24, 1999 4:03 PM To: Emc-Pstc (E-mail) Subject: Direct Contact Discharge into Vents to EN61000-4-2 -Original Message- From: Jacowleff, Bill Sent: Friday, September 24, 1999 3:53 PM To: EMC POST GROUP (E-mail) Subject: Direct Contact Discharge into Vents to EN61000-4-2 Greetings to all: I am testing a product that has small plastic modular housing with vents to EN61000-4-2. At 8 kV Air discharge I have discharge to the open vents which is fine, the PCB is protected on the perimeter and tolerates this well. However my question is with the Direct Contact Discharge to these vented areas. I am under the impression of where I have an air discharge I am to follow-up that area with a Direct Contact Discharge. In this particular case the vents are large enough to allow the tapered Direct Contact Discharge Tip to fit deep enough in the vents, passing the perimeterprotection on the PCB and come in direct contact with one component on the PCB. So my question is How far should the Direct Contact Discharge Tip be inserted into a vent? As far as it will reach? Or shouldthe Direct Contact Discharge Tip be limited to touching the outside wall of the module near the vent? Thanks for your reponse in advance. Best Regards, Bill Jacowleff VDO Control Systems Airpax Instruments 150 Knotter Drive Cheshire, CT 06410 Phone: 203 271-6394 FAX:203 271-6200 bjacowl...@vdo.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: Bonding Meter
That pretty much takes a four point measurement. However, if you're after only reading about the right value, or side by side comparisons of the esr of a cap, try Dick Smith's esr meter. Less than $60 in kit form from Australia. Is easy to put together and extremely functional for measuring the esr of caps (while still in the circuit) and for measuring all kinds of other low impedance stuff, like connectors. I think the model number is the K-7204, or such. - Robert - -Original Message- From: Derek Walton l...@rols1.net To: IEEE EMC Discussion Group emc-p...@majordomo.ieee.org List-Post: emc-pstc@listserv.ieee.org Date: Friday, September 24, 1999 11:35 AM Subject: Bonding Meter Hi folks, can anyone recommend a meter for making resistance measurements as low as 1 milliohm? Thanks, Derek. - 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).
Direct Contact Discharge into Vents to EN61000-4-2
-Original Message- From: Jacowleff, Bill Sent: Friday, September 24, 1999 3:53 PM To: EMC POST GROUP (E-mail) Subject: Direct Contact Discharge into Vents to EN61000-4-2 Greetings to all: I am testing a product that has small plastic modular housing with vents to EN61000-4-2. At 8 kV Air discharge I have discharge to the open vents which is fine, the PCB is protected on the perimeter and tolerates this well. However my question is with the Direct Contact Discharge to these vented areas. I am under the impression of where I have an air discharge I am to follow-up that area with a Direct Contact Discharge. In this particular case the vents are large enough to allow the tapered Direct Contact Discharge Tip to fit deep enough in the vents, passing the perimeterprotection on the PCB and come in direct contact with one component on the PCB. So my question is How far should the Direct Contact Discharge Tip be inserted into a vent? As far as it will reach? Or shouldthe Direct Contact Discharge Tip be limited to touching the outside wall of the module near the vent? Thanks for your reponse in advance. Best Regards, Bill Jacowleff VDO Control Systems Airpax Instruments 150 Knotter Drive Cheshire, CT 06410 Phone: 203 271-6394 FAX:203 271-6200 bjacowl...@vdo.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).
High-power amplifier
I am looking for an amplifier with the following specifications: Frequency Range: 1 Hz - 200 kHz Output Power: 500 Watts into 0.5 ohms Can anyone suggest a possible source. Regards, Ravinder Email: ajm...@us.ibm.com *** Always do right. This will gratify some people and astonish the rest. Mark Twain - 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).
UL and CE Mark Acceptance
Hello All, What countries will accept UL Mark without additional testing or marking? Does anyone know of a list of countries other than the EU members that accept the CE Marking without additional testing or marking? Best Regards, Pryor McGinnis c...@prodigy.net - 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: Bonding Meter
Derek: It is going to take an instrument with 4-lead Kelvin probes. I would recommend that you get in touch with Keithly Instruments @ 440-248-0400. I suggest that you be seated when they quote price! Regards, Val L. Erwin EMC Consultant Summit Associates, Inc. - 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).
RESUMES JOB LISTINGS
Group, As a free service, we are now posting resumes and job openings in our EMC SUPPLIERS DIRECTORY: http://www.tempest-inc.com/suppliers.htm If you are looking for EMC people or looking for a job, email your resume or job announcement to us and we will post it at no charge. We already have some good ones, so take a look! regards, Lou Gnecco - 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).
GTEM Cells for Pre-Compliance
My company manufacturers small (physically) products. I am investigating the use of a GTEM cell for pre-compliance radiated emissions/immunity testing to EN 55022, FCC Part 15, ICES-03, AS/NZS 3548 etc . . . I would like to hear from this group what your views are concerning this. The key word here is 'pre-compliance'. Has anyone had any experience using GTEM cells and how have your results correlated with final compliance scans at an OATS? John A. Juhasz Product Qualification Compliance Engr. Fiber Options, Inc. 80 Orville Dr. Suite 102 Bohemia, NY 11716 USA Tel: 516-370-1324 Fax: 516-567-8322
LCD Displays
I have a product that has an LCD display with an Inverter that operates at 100Khz 2KV and I believe is capable of supplying 6.5mA The question is does it require a fire enclosure? If it does what are the requirements for the flamability of the screen and any plastic protective covers fitted to it. The screen is quite large, about the size of a laptop PC screen. Perhaps some laptop PC manufacturers might have some ideas? are there any other things I must consider when using such a device apart from, obviously, insulation of the HT. Regards, Duncan. - 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: Modulations during Radiated Immunity Tests
Krzysztof The medical device standards EN 60601-1-2, and the US FDA regulations require the use of a modulation frequency that is representative of the function being measured. (i.e. respiration, heart rate, brain waves, etc.) This makes for an interesting test as the frequencies involved are usually a range that has to be swept for each Carrier frequency step. John Mowbray EMC Engineer NCR Canada -Original Message- From: krzys...@polbox.com [SMTP:krzys...@polbox.com] Sent: Friday, September 24, 1999 6:22 AM To: emc-p...@majordomo.ieee.org Subject: Modulations during Radiated Immunity Tests Importance: High Dear Group, My matter concerns different kinds of modulation used during radiated immunity tests. For instance: IEC 1000-4-3: 1995 describes 80%-depth Amplitude Modulation with a 1kHz sinwave, ENV 50204: 1995 describes keyed carrier modulation (on-off, duty cycle 50%). My question is: do you know any standards (international, national, technical documentations, etc.) which describes different kind of modulations than these above (for instance AM with squarewave or Frequency Modulation or other ways of carrier keying) during tests. Would you please give me the number and title of the standards, frequency range, test levels and, of course, parameters of modulation. The second question: do you know any product, product family and other standards which call AM80%1kHz modulation and keyed carrier - cycle duty 50%. Thank you, Krzysztof Sieczkarek Laboratorium Technik Automatycznej Identyfikacji Instytutu Logistyki i Magazynowania Poznan, Poland fax +48 61 8526376 http://www.ilim.poznan.pl/la/index_E.html - 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).
Bonding Meter
Hi folks, can anyone recommend a meter for making resistance measurements as low as 1 milliohm? Thanks, Derek. - 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: Modulations during Radiated Immunity Tests
Krzysztof, For question 2: EN50082-1:1998 Electromagnetic compatibility - Generic immunity st7andard Part 1. Residential, commercial and light industry and EN50082-2:1995 Electromagnetic compatibility - Generic immunity standard Part 2. Industrial environment Call for both AM80% modulation (over 80-1000MHz) and keyed carrier 50% duty cycle (at 900MHz +/- 5MHz) for the radiated RF immunity tests. Regards, Jeff Bailey EMC Technologist SST - A Division of Woodhead Canada Ltd. Phone: (519) 725 5136 ext. 363 Fax: (519) 725 1515 Email: jbai...@sstech.on.ca Web: www.sstech.on.ca All comments here are my own and do not necessarily express the views of SST. -Original Message- From: krzys...@polbox.com [mailto:krzys...@polbox.com] Sent: Friday, September 24, 1999 6:22 AM To: emc-p...@majordomo.ieee.org Subject: Modulations during Radiated Immunity Tests Importance: High Dear Group, My matter concerns different kinds of modulation used during radiated immunity tests. For instance: IEC 1000-4-3: 1995 describes 80%-depth Amplitude Modulation with a 1kHz sinwave, ENV 50204: 1995 describes keyed carrier modulation (on-off, duty cycle 50%). My question is: do you know any standards (international, national, technical documentations, etc.) which describes different kind of modulations than these above (for instance AM with squarewave or Frequency Modulation or other ways of carrier keying) during tests. Would you please give me the number and title of the standards, frequency range, test levels and, of course, parameters of modulation. The second question: do you know any product, product family and other standards which call AM80%1kHz modulation and keyed carrier - cycle duty 50%. Thank you, Krzysztof Sieczkarek Laboratorium Technik Automatycznej Identyfikacji Instytutu Logistyki i Magazynowania Poznan, Poland fax +48 61 8526376 http://www.ilim.poznan.pl/la/index_E.html - 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).
Modulations during Radiated Immunity Tests
Dear Group, My matter concerns different kinds of modulation used during radiated immunity tests. For instance: IEC 1000-4-3: 1995 describes 80%-depth Amplitude Modulation with a 1kHz sinwave, ENV 50204: 1995 describes keyed carrier modulation (on-off, duty cycle 50%). My question is: do you know any standards (international, national, technical documentations, etc.) which describes different kind of modulations than these above (for instance AM with squarewave or Frequency Modulation or other ways of carrier keying) during tests. Would you please give me the number and title of the standards, frequency range, test levels and, of course, parameters of modulation. The second question: do you know any product, product family and other standards which call AM80%1kHz modulation and keyed carrier - cycle duty 50%. Thank you, Krzysztof Sieczkarek Laboratorium Technik Automatycznej Identyfikacji Instytutu Logistyki i Magazynowania Poznan, Poland fax +48 61 8526376 http://www.ilim.poznan.pl/la/index_E.html - 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).
