RE>>HiPot Testing - Operator SafetyÉ 13/1/98
Eric and EMC-PSTC Zapping operators in Hi-Pot tests. I'll let you know how a previous company of mine ( A large German Electrical manufacturing company) achieved hi-pot safety on a printer production line in Berlin. 1. Product arrives on roller way into the test cell. 2. Operator attaches calibrated power leads. 3. Perspex cell door closes arming 1 cut out switch. 4. Operator uses both hands 4 ft apart on 2 switches to arm and zap the product. 5. Test failure locks the normal flow of the product which then exits to the rear of the test cell into the re-work cycle. This was an absolutely random audit of a huge factory. On requesting the log from the operator of the unit a handwritten book was produced showing limit/fail checks and due dates for next calibration of pass fail samples completed up to 08:00 hours that morning. I was impressed. There was no possibility of zapping an operator with this syste. Jerry Roberton EMEA Homologation -------------------------------------- List-Post: [email protected] Date: 12/1/98 8:27 pm To: Jerry Roberton From: [email protected] Eric, Getting "zapped" during a hipot test would mean test setups improvements and/or additional safety precautions are needed quickly. Having such a problem may have serious consequences if they are not resolved quickly. Since you're not sure of the mechanism as yet and have not provided any real details, I can only hypothecate generally of some some possible scenarios, which are: 1) Insufficient training of test personnel and/or documentation This can produce a host of problems from incorrect test setup to leaning on the EUT during testing. This is one test that only trained personnel be allowed to operate due to the hazardous nature of the test. 2) Defective test equipment and/or EUT 3) Incorrectly connected test setup and/or EUT Either can produce potentially hazardous situations. The operator of this test must be either adequately instructed against or physically prevented from contacting the test setup and EUT during this test. Actually, I believe the only way to get "zapped" during a hipot test is to come into contact with the hipot test voltage (assuming that the operator is getting zapped from the test voltage iteslf). Good luck in finding the corrective measure to this problem and I would behove you to find it quickly. Anyway, this is just my 2 cents worth. Regards, Ron Pickard [email protected] ______________________________ Reply Separator _________________________________ Subject: HiPot Testing - Operator Safety Precautions? Author: <[email protected]> at INTERNET List-Post: [email protected] Date: 1/8/98 10:53 AM We're looking into a problem where, on occasion, our manufacturing operators are getting zapped while operating a production HiPot test station. (Just how this happens is yet to be determined.) I've reviewed literature on HiPot equipment, but nothing I have suggests any operator safety features are available. I can imagine some simple methods to prevent this, but I thought it might be worth soliciting ideas from those that have successfully solved this particular problem, since it may be a more common problem than most of us realize. Regards, Eric Lifsey Compliance Engineer National Instruments ------------------ MIME Information follows ------------------ --simple boundary Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Description: "cc:Mail Note Part" <<<<<< See above "Message Body" >>>>>> --simple boundary-- ------------------ RFC822 Header Follows ------------------ Received: by mac3.net.com with ADMIN;12 Jan 1998 20:25:18 -0800 Received: from ns1.net.com by unet.net.com (SMI-8.6/SMI-SVR4) id UAA00472; Mon, 12 Jan 1998 20:21:23 -0800 Received: from ruebert.ieee.org (ruebert.ieee.org [199.172.136.3]) by ns1.net.com (8.8.6/8.6.9) with ESMTP id UAA24746; Mon, 12 Jan 1998 20:25:52 -0800 (PST) Received: (from daemon@localhost) by ruebert.ieee.org (8.8.8/8.8.8) id TAA00633 for emc-pstc-list; Mon, 12 Jan 1998 19:56:29 -0500 (EST) From: [email protected] Message-Id: <[email protected]> X-Mailer: ccMail Link to SMTP R8.20.00.0 BETA List-Post: [email protected] Date: Thu, 08 Jan 98 15:45:16 -0700 To: <[email protected]> Subject: Re: HiPot Testing - Operator Safety Precautions? MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="simple boundary" Sender: [email protected] Precedence: bulk Reply-To: [email protected] X-Resent-To: Multiple Recipients <[email protected]> X-Listname: emc-pstc X-Info: Help requests to [email protected] X-Info: [Un]Subscribe requests to [email protected] X-Moderator-Address: [email protected]
