Re: [PSES] LED Spots in EMC Chamber [General Use]

Thanks everyone for the replies. I will pass this information onto the person who raised this query. >From the information I was provided the LED Spots issue a broadband noise seen >as rise in the ambient noise floor over the frequency range 30MHz to 180MHz, >there is some minor noise between

Re: [PSES] Safe powering 12V doorlock

There is no definition of PELV because the definition of 'SELV circuit' does not prohibit a connection to earth, as other definitions of SELV do. Also see Note 2: NOTE 2 This definition of an SELV CIRCUIT differs from the term "SELV system" as used in IEC 61140. John Woodgate OOO-Own

[PSES] calibration of laser power and energy meters

Dear all, Does anyone knows any calibration laboratory that can perform traceable calibration of laser power and energy meters? Preferable in EU. Thank you for your support. Best regards, Bostjan - This message is from the

Re: [PSES] Safe powering 12V doorlock

Hi Piotr, I agree with Rich. According to specification, output also complies with LPS (Limited Power Source) therefore output must be SELV. There is no PELV definition in IEC 60950-1. About table 5B or 5C, which table you will use does not depend on output from your power supply but on

Re: [PSES] Safe powering 12V doorlock

Hi Piotr: The easy way to answer your questions is to request a copy of the TUV report. 1. I suppose that 12 doorlock manufacturer can use only functional isolation betwean 12V and its metal casing as he can assume (I think) that he gets safe voltage. If I'm wrong with it let me know. Yes,

Re: [PSES] Safe powering 12V doorlock

For definitions of ELV, SELV, and PELV, I turn to IEC TC64, Electrical installations and protection against electric shock, and its publication 61140, Protection against electric shock – Common aspects for installation and equipment. TC 64 is “to lay down basic safety requirements for

Re: [PSES] Safe powering 12V doorlock

The definition of PELV that I have is, I think, from IEC 60364, and it says 'not electrically separated from earth', which I interpret as meaning 'connected to earth but not necessarily with a connection that can withstand a large fault current'. You must do as you see fit, but I think that

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

There's also immunity to consider. If you are chucking around 10V/m or more then your lights could end up flickering. Could cause problems with remote monitoring via camera if monitoring brightness of a display for example. Obviously depends partly on cable routing for the lights. When I

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

Larry Stillings gave a link: http://www.panashield.com/emc_hybrid_absorber.asp Ken Javor Phone: (256) 650-5261 > From: "Grasso, Charles" > Reply-To: "Grasso, Charles" > Date: Wed, 22 Nov 2017 21:51:40 + > To:

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

Hey Ken - Cardboard absorber? -Original Message- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Wednesday, November 22, 2017 12:38 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Use of LED Spots in EMC Chambers [General Use] This message originated outside of DISH and

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

Dear member of the Land & Naval Defence Electronics Division, Linear regulators, where the input is the output of a SMPS, are subject to the limitations of the PSRR of the 78xx regulators; typically less than 20dB above 40kHz. Even if no SMPS, then the typical 78/79XX does little for the

Re: [PSES] Safe powering 12V doorlock

John, Reading EN 50491-3 (HBES and BACS safety) it looks that for devices like our controller 60950-1 is right choice. I have newer found the better fitting standrd. Meanwell also selected 60950-1 for their supply. So the only unknown are the standard for doorlock and wires :). If the

Re: [PSES] Safe powering 12V doorlock

Dave, I was thinking if first ask Meanwell or here, and decided to ask here believing I will learn more. Till now from Meanwell reseller in Poland I know that for some supplies they specify that output is SELV, but for this one there is no such information. I plan to ask them following

Re: [PSES] Safe powering 12V doorlock

John, If the output is SELV earthed (in other standards PELV) then (as I read 60950-1) table 5B applies and test 3kV is ok. If you decide to use 5C table then because of earthing you can use one level lower test voltage (as I read Annex G) and you end also with 3kV test. But there is no info

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

The white cardboard absorber does the job in concert with the underlying ferrite tile. I don't know their performance alone, but based on size they don't do much below maybe 400 MHz or thereabouts. Ken Javor Phone: (256) 650-5261 > From: Ralph McDiarmid

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

We purchased these for a 10 m chamber. They are floods, not spots, but I thought it worthwhile to forward. They have an option for suspended mount, but we chose to mount them flush to the ceiling. The emissions are so low that we can not detect any change to the ambient (commercial freq range,

Re: [PSES] Safe powering 12V doorlock

But does 60950-1 apply when the application is a door lock?  In any case, I am not suggesting that any particular power supply is unreliable, but you never know what happens in installations and 'power cross' is not an unknown hazard. John Woodgate OOO-Own Opinions Only J M Woodgate and

Re: [PSES] Safe powering 12V doorlock

In order for a power supply to meet SELV requirements it must pass all of the tests in the EN60950-1 standard for SELV which means component failure testing among other things, not simply isolation testing. Meanwell power supplies that I have researched have been SELV. Meanwell has been very

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

Series-pass regulator with a simple bridge rectifier is not zero emission, but negligible compared to a well-filtered switch-mode PSU. Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric From: John Woodgate [mailto:j...@woodjohn.uk] Sent: Wednesday, November 22,

Re: [PSES] Safe powering 12V doorlock

We need to be very careful here. There is not a single definition of 'SELV'. Some definitions allow the LV circuit to be earthed, some do not, and refer to 'Protected Extra-Low Voltage (PELV)' for SELV which is earthed. Non-earthed SELV is OK for some purposes, but  I don't like it for

[PSES] Safe powering 12V doorlock

Dear safety experts, Help me to make me sure that it is save to use the following power supply: http://www.meanwell.com/webapp/product/search.aspx?prod=DRC-40 to power 12V doorlock with not earthed 12V supply. I think that from practical point of view it is save but how it looks formally.

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

That's a great solution Ken. BTW, do those white cardboard pyramids absorb much RF? Our old 3m chamber uses the blue foam pyramids only and four 60W ceiling lights; fairly dark inside on a good day. And, the pyramids are held to ceiling and walls with Velcro which doesn't really hold very

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

One really excellent installation relied on the fact that the chamber was ferrite tile-lined with an overlay of the white cardboard pyramids. Thus didn't need nearly as much light as ferrite tiles alone or blue cones. LEDs were outside the chamber, placed in the end of a plastic light pipe, which

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

78 series regulators (except 78Sx which are switchers) do produce a little noise but I expect you have them well shielded. There are, of course, 'quieter' regulators. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK On 2017-11-22 14:49,

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

We use LED spots in our anechoic chambers. They are running now for several years.  However we replaced the switcher with a linear PSU. We installed a transformer, bridge rectifier and constant current source using an LM7805 in each one. Works a treat and they are zero emission. We have had to

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

We just had our metal halide light fixtures replaced with LED fixtures in our large 10 meter Semi Anechoic Chamber and they are GREAT!!! I have requested the Make and Model Number information from our Maintenance Department which I'll pass on when I get it. This is a holiday weekend for us so

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

Could there also be various high frequency sources within the lamps themselves which would are not filtered by the filters external to the chamber (and the lamps may not have properly shielded bodies and/or lenses)? John E Allen W.London, UK From: John Woodgate [mailto:j...@woodjohn.uk]

[PSES] personel lifting equipment

Hi I have trouble finding requirements for a baby cradle rocker. The rocker is at the same time the cradle fixing. The rocker have 2 hooks one for hanging it from eg. a hook in sealing and the other hook is used to hang the cradle on. (The cradle is made mostly of fabric and is CE marked).

Re: [PSES] Use of LED Spots in EMC Chambers [General Use]

It's hardly surprising, is it? These lamps are not designed for the very special EMC environment of test chambers.  Lamps using a DC supply are indicated, but the DC supply itself must be specially filtered and installed outside the chamber. John Woodgate OOO-Own Opinions Only J M Woodgate

[PSES] Use of LED Spots in EMC Chambers [General Use]

Hi all. Has anyone had experience with using LED Spot lamps in EMC Chambers? What types/manufacturers would be recommended? Would appreciate help in trying to solve someone's problems with noise during radiated emissions. Test Facility has just had all their chambers converted to LED Spots and