RE: Performance Criterion

Ralph, You'll never make it on a standards committee. You don't use enough words to say what you mean. ;-) Ghery Pettit From: Ralph McDiarmid [mailto:ralph.mcdiar...@xantrex.com] Sent: Monday, April 28, 2003 2:23 PM To: emc-p...@majordomo.ieee.org Subject: RE: Performance Criterion I mai

Re: Check list for PCB Layout

> > Hi everybody, > > I would like to create a check list in order to help designers and PCB > routers of my company to improve their design / EMI and SI. Use this commented pcb checklist from Xilinx as a good starting point -

RE: Thermocouple glue

I agree with you. If an agency disallows a particular test set-up or procedure, they should be able to articulate that concern in writing and justify it as well. I know that may sound somewhat idealistic. Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc. www.xantrex.co

RE: Thermocouple glue

I don't agree with the general approach and opinions on traditional yeah vs. nayjust because they ( Safety Agency) doesn't understand, if the Mfr'r uses it in the right context, and it does not promote a safety deviaition than it should be accepted... a concrete reasoning for NOT accepting it

RE: Thermocouple glue

If it can be shown that the thermocouple remains attached and in good contact with the surface to be measured, I don't know why the agencies would not accept the use of thermal grease. There concern might be the affect the thermal compound has on the adhesive of the tape. Sometimes, they oppose

RE: Thermocouple glue

Ron- If you were using thermal grease long in the past, it may have been a silicone-based grease. The stuff is notorious for migrating easily, getting into switch contacts and other places causing malfunctions. Don Borowski Schweitzer Engineering Labs Pullman, WA "Ron Pickard" @majordo

RE: Check list for PCB Layout

I don't know if this is a too far-reachinig answer to the inquiry, but for someone who is interested in more than quick summary of the technical aspects, I would recommend to start with Clayton R. Paul: Introduction to Electromagnetic Compatibility, John Wiley & Sons. BTW, I agree taht H. Joh

RE: Thermocouple glue

Why? From: Brian O'Connell [mailto:boconn...@t-yuden.com] Sent: Monday, April 28, 2003 12:55 PM To: emc-p...@majordomo.ieee.org Subject: RE: Thermocouple glue My use of thermal grease was discontinued several years ago by request of various agency engineers reviewing test data/technique. And m

Re: Check list for PCB Layout

I'm curious about "Genius Institute" as well. I belong to Mensa, but I've never heard of a Genius Institute. John Howard EMC Consultant james.free...@infineon.com wrote: >Is this for real? is there actually in institute for geniuses? This would explain why we are all really in the dark. No geni

RE: Thermocouple glue

My use of thermal grease was discontinued several years ago by request of various agency engineers reviewing test data/technique. And more recently, during my ISO 17025 audit, the NCB auditor explicitly directed me to never use thermal grease for thermocouple application. And auditors from other NR

Re: Thermocouple glue

To all, I'm surprised that no one hasn't mentioned this yet. In the past for this application, the securement that I was introduced to was fiberglass tape and that white thermal grease. The tape exhibited high thermal stability and was used to secure the thermocouples, but left adhesive residue

RE: Performance Criterion

Ghery, I was hoping my response would get a discussion going and am pleased that you responded. Please be aware, however that the basic message I wanted to get across is that while there are clear passes (#1) and clear failures (#9); there are also gray areas. In these gray areas, whether the EUT

RE: Performance Criterion

Nonsense! Both the basic standard and the CISPR standard have words to the effect that performance degradation is defined by the manufacturer. John P. Wagner Regulatory Compliance & Mandatory Standards AVAYA Regulatory Compliance Laboratory 1300 W. 120th Ave, Room B3-D16 Westminster, CO 80234-

RE: Check list for PCB Layout

Krzesaj, another source of information is the IEEE EMC Society. The Society has symposiums around the world that you can attend and hear experts first hand. If you are not able to attend, you can get a CDROM with the presentations on them. See the details about past CDROMs at: http://www.ewh.ieee

Re: Surface Temperature Limits

Hi Brian: > In EN61010-1 section 10 and EN60950 safety standards, there are surface > temperature limits specification for Normal Condition based on an Ambient > Temperature of 40ºC. Our company makes analytical instrumentation and a new No, this is not true for IEC 60950. The tempera

Re: Performance Criterion

I read in !emc-pstc that Ralph McDiarmid wrote (in <67C475A5ECE7D4118AEC0002B325CAB602D2F9E0@BCMAIL1>) about 'Performance Criterion' on Fri, 25 Apr 2003: >They might just as well say, "It is the manufacturer's responsibility for >defining an acceptable level of performance and functionality for

RE: Thermocouple glue

> From: pauljsmi...@cs.com > Sent: Friday, April 25, 2003 8:53 AM > > In a message dated 4/23/03 5:37:13 PM Eastern > Daylight Time, peter.tar...@sanmina-sci.com writes: > > > Bill - > > > If you're referring to what I think you are, it's > > "fuller's > > earth and waterglass," which is a clay-li

Re: DERIVATION OF CREEPAGE AND CLEARANCES

Hi Gordon: > Does anyone know from where the values for creepage and clearances given in > EN61010-1 ("safety requirements for electrical equipment for measurement, > control and laboratory use - part 1 general requirements") are derived i.e. > are there other standards "below" 61010

PCB EMI books

to all: Here is a list of books that I find very useful for PCB/EMC/SIG INTEG work. Listed in order of usefulness to me: High-Speed Digital System Design, Stephen H. Hall High-Speed Digital Design: A Handbook of Black Magic, Howard W. Johnson EMC and the Printed Circuit Board, Mark I. Montrose