Re: [PSES] Product Safety Newsletter, Volume 7, Number 4, July-August, 1994?

Hi Rich, I may have spoken too soon - there's something odd between the No. 3 and 4 issues. Although both issues have the same number of pages (24) they are not exact duplicates of each other. Some pages match while other pages don't match between the issues. This is why I concluded they

Re: [PSES] Product Safety Newsletter, Volume 7, Number 4, July-August, 1994?

Hi Richard, Could the issue you're looking for have a typo for the Number? (i.e., the "No. 3" should really be "No. 4" for July-August issue?) Here's all 1994 issues, and the actual content for each one is different, no duplicates. https://ewh.ieee.org/soc/pses/Downloads/newsletters/94

Re: [PSES] Using 60 Hz isolation transformer at 400 Hz

This is done all the time for testing transformers to the induced voltage test. Safety testing of a transformer requires a verification of a higher voltage operation and the only way to do this without saturating the core is to increase operating frequency. The formulas below show that Voltage an

[PSES] medical immunity reference

Anyone read the new TR60601-4-2:2016? EMC pros wanna provide an over-view statement and/or critical clause notes for us plebeians? Thanks, Brian - This message is from the IEEE Product Safety Engineering Society emc-pstc discussi

Re: [PSES] BLE and air plane travel

The FAA allows Bluetooth throughout the duration of a flight. See the following press release from 2013. http://www.faa.gov/news/press_releases/news_story.cfm?newsid=15254 Individual airlines can place stricter requirements on the operation of wireless devices if they choose, but I doubt many wo

Re: [PSES] Using 60 Hz isolation transformer at 400 Hz

I have used a 60 Hz transformer for MIL-STD-461 CS01/101 which is much higher power than required for this application. I may have not gotten to 50 kHz/150 kHz, but it was just fine at 1 kHz. It's not a problem. Ken Javor Phone: (256) 650-5261 > From: Brian O'Connell > Reply-To: Brian O'Connel

[PSES] Product Safety Newsletter, Volume 7, Number 4, July-August, 1994?

I'm looking for a copy of the Product Safety Newsletter, Volume 7, Number 4, July-August, 1994. The one in the PSES web archive is really Number 3, and the folks who created the archive don't have a copy. If you have a copy of this issue, would you please scan and send to me? Or, you can send t

Re: [PSES] Using 60 Hz isolation transformer at 400 Hz

Think of it in terms of hysteresis loss and eddy current, which are proportional to freq. Eddy current loss would depend on construction (hi-R magnetics and lam thickness). Might want to verify xfmr temp. And it may be noisy. The biggie is to never use a 400Hz xfmr at 60Hz (core sat). If you a

Re: [PSES] Strain Relief Test (SEMI S2)

On 7/8/2016 2:10 PM, Doug Powell wrote: The company and the test lab both had a mis-communication on what was really needed. I've been trying to imagine a permanently attached earbud cable that could withstand that kind of force. Heh! Cortland - ---

Re: [PSES] Strain Relief Test (SEMI S2)

Problem solved.Turns out the lab doing the product assessment had applied the entire SEMI S2 guideline and referenced SEMI S22. This product is a small controller which had already undergone the UL 61010-1 evaluat

Re: [PSES] BLE and air plane travel

BLE = Bluetooth, Low Energy John R. Kretsch, P.E., NCE Interpro Consulting Engineering, LLC jkret...@ip-ce.com On Jul 8, 2016, at 13:28 , John Woodgate wrote: What is BLE? I'm into hearing aids, but I've not met that TLA. With best wishes DESIGN IT IN! OOO – Own Opinions Only www.jmwa.demon

Re: [PSES] BLE and air plane travel

What is BLE? I'm into hearing aids, but I've not met that TLA. With best wishes DESIGN IT IN! OOO – Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England We live in exiting times From: Curtis McNamara [mailto:mcnam...@umn.edu] Sent

Re: [PSES] Strain Relief Test (SEMI S2)

Anchor the box, and do the 35 lb. test. If it passes, you’re done. If it fails, you have the ammo to change to an appliance coupler. It’s a simple and easy test. The pull test proves that the anchor hole and cord diameter are the right dimensions. We already know that the anchor

Re: [PSES] Using 60 Hz isolation transformer at 400 Hz

A 60 Hz transformer works fine at 400 Hz. The other way, not so much. Ken Javor Phone: (256) 650-5261 From: David Gelfand Reply-To: David Gelfand Date: Fri, 8 Jul 2016 16:25:06 + To: Conversation: Using 60 Hz isolation transformer at 400 Hz Subject: [PSES] Using 60 Hz isolation transform

[PSES] Using 60 Hz isolation transformer at 400 Hz

Esteemed colleagues, I have to prepare a debug setup for a DO-160 test, and we need to float the 400 Hz power supply. Can we use an isolation transformer rated at 60Hz, 150 VA? The EUT draws about 10W. Your input is most appreciated. Regards, David -

[PSES] BLE and air plane travel

A friend has hearing aids with BLE. Does he need to turn them off during airplane travel? The FAA has given airlines permission to allow wireless. So does it depend? Or does the power level impact it? How about other countries? Thanks! Curt https://www.faa.gov/ne

Re: [PSES] EU OJ today, 20160708

2016 at 10:55 PM To: Subject: [PSES] EU OJ today, 20160708 To all, FYI for those that are/will be affected. In the EU OJ today (see link below), there were four (4) harmonized standards lists published + 1 corrigendum. http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=OJ:C:2016:249

[PSES] EU OJ today, 20160708

To all, FYI for those that are/will be affected. In the EU OJ today (see link below), there were four (4) harmonized standards lists published + 1 corrigendum. http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=OJ:C:2016:249:TOC This includes new lists for the following directives: * L