Re: [PSES] Power Amp for IEC 61000-4-16

I¹m not familiar with the 61000-4-16 standard and its limit. If the limit is flat and requires 30 Vrms oc output at 150 kHz, that would indeed be a problem if you had to do it with an audio amplifier, but of course that isn¹t necessary. Every lab has a 50 Ohm output amplifier that starts at 10 kH

Re: [PSES] Power Amp for IEC 61000-4-16

1% THD all the way to 150kHz? Just wondering if the older analogue amps could do that, not to mention the (Class D?) amplifiers of today. Why not just put a 50 ohm resistor in series with the amplifier output. Audio amps should have no trouble operating into an open circuit. A 100W/ch amp s

Re: [PSES] Another TMP audit

Monty Python - department of arguments sketch with John Clease (spelling?) Enjoy http://www.youtube.com/watch?v=9F7dL41VaRk Gary -Original Message- From: Brian Oconnell [mailto:oconne...@tamuracorp.com] Sent: Tuesday, January 24, 2012 12:57 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [

Re: [PSES] Power Amp for IEC 61000-4-16

Any decent quality audio power amplifier will have THD below 1% these days. Consider using a step-up transformer such as the Solar Electronics 8810-1. It is designed to impedance match from 1.5 Ohms to 50 Ohms, and can handle 200 Watts. That will more than suffice for your needs. Ken Javor Phon

[PSES] Power Amp for IEC 61000-4-16

A new testing requirement for some of my company's products is IEC 61000-4-16 Conducted Common Mode Disturbances. I need to test from 10 kHz to 150 kHz. I have a good low distortion signal source, but I need a power amplifier to give me the signal at the test level: 30 Vrms open circuit, 50±5 o

Re: [PSES] UL recognized molders

The supposed cost is one or two orders of mag too hi for the mold cost. For much of our stuff, we design the mold and make in North America, then ship to factory - so this could not possibly be the cause of this monstrous number. Non-recognized molder = potential fire bomb. I used to enjoy flame

Re: [PSES] UL recognized molders

I've used us recognized molded vendors multiple time, they were all US and not China or other offshore - but the cost compared to other vendors was minimal. You're right it's a paper chase, the audit is, or at least was, on the molding process not the part being produced. UL comes in ask what yo

Re: [PSES] 120 ohm CAN cable

Would you believe zip cord works pretty well ~ 90-110 ohms. Fred Townsend DC to Light From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of McInturff, Gary Sent: Tuesday, January 24, 2012 10:16 AM To: 'EMC-PSTC@LISTSERV.IEEE.ORG' Subject: 120 ohm CAN cable Can bus requires a 120

Re: [PSES] power plugs

In message , dated Tue, 24 Jan 2012, "ce-test, qualified testing bv - Gert Gremmen" writes: small correction/addition: on the plug the grounding socket is additional to the side-contacts making this plug the default plug for all Europe. I would recommend investing in this plug (CEE 7/7 hybr

Re: [PSES] power plugs

small correction/addition: on the plug the grounding socket is additional to the side-contacts making this plug the default plug for all Europe. I would recommend investing in this plug (CEE 7/7 hybrid) for all <10A Class I apparatus. http://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/CEE_7

Re: [PSES] 120 ohm CAN cable

Of course. What I'm looking at is that Gary needs to convince his customer. Cortland Richmond On 1/24/2012 1444, ce-test, qualified testing bv - Gert Gremmen wrote: The echo problem is only relevant for the highest baudrates, where the length of the cable and the propagation time is in

Re: [PSES] UL recognized molders

Brian - The UL molder's program is a paper chase for traceability. That cost seems unlikely to be directly attributable to charges they pay to UL, unless something has drastically changed under the latest management. The only way this could cost a company $10E6 is very high volume and the time t

[PSES] Another TMP audit

TMP/SMT auditor - and the chamber control code is written in? me - Python TSA - snake? me - the name of the language TSA - named for a snake? me - no, the Monty Python Flying Circus TSA - are you being funny? me - never - This messag

Re: [PSES] UL recognized molders

In message <1b8bc5e0eae14ba09d7b462bbd89e...@tamuracorp.com>, dated Tue, 24 Jan 2012, Brian Oconnell writes: One of the things that UL does ok is the recognized molder program. Removes a huge burden from my shoulders when I buy from a supplier having a QMMY2 file. Have now had two China facto

Re: [PSES] power plugs

In message , dated Wed, 25 Jan 2012, Scott Xe writes: In Europe, Euro plug is widely used and accepted although each country may have their own plug. As in EN standard, the product must be fitted with the plug in the country where the product is sold. Is Euro plug legally correct in those

Re: [PSES] 120 ohm CAN cable

The echo problem is only relevant for the highest baudrates, where the length of the cable and the propagation time is in the same order of magnitude as a baud time. If you run a CAN at 250 kHz it will run on any cable. Notice that the susceptibility for high frequencies may suffer ! Gert

Re: [PSES] 120 ohm CAN cable

Gary, Any reflections that unacceptably degrade the CAN signal must be avoided, which is the reason for terminations. Network cables usually run 105 Ohms or so and reflections from cable-to-load will at 120 Ohms be relatively low-level. You can probably DEMONSTRATE there's no need for better

[PSES] UL recognized molders

One of the things that UL does ok is the recognized molder program. Removes a huge burden from my shoulders when I buy from a supplier having a QMMY2 file. Have now had two China factories claim UL costs are at $10E6 USD per annum, so are dropping factory recognition. 1. Is this cost reality or hy

Re: [PSES] 120 ohm CAN cable

Thanks, that is exactly what I keep trying to tell them, unsuccessfully for the moment, and wanted to check my facts. Gary From: Rob Kado [mailto:rk...@chrysler.com] Sent: Tuesday, January 24, 2012 10:42 AM To: McInturff, Gary; 'EMC-PSTC@LISTSERV.IEEE.ORG' Subject: RE: 120 ohm CAN cable The cabl

Re: [PSES] 120 ohm CAN cable

The cable itself does not need to be 120 Ohms; it is the resistor across CAN High to Low at the end. Rob Kado Manager & Sr Technical Specialist Electromagnetic Compatibility Chrysler 800 Chrysler Drive CIMS 481-47-20 Auburn Hills, MI 48326 Desk: (248) 576-6915 Mobile: (248) 467-0639 Fax:

Re: [PSES] 120 ohm CAN cable

In message , dated Tue, 24 Jan 2012, "McInturff, Gary" writes: Can bus requires a 120 termination, and I have a client that is trying to do it with the bare cable, and I don't know that such cable exists unless custom built. I'm aware of impedance controlled coax but this is just your stan

Re: [PSES] power plugs

Hello Scott, The Europlug is commonly accepted across Europe with the exception of the countries that use the BS 1363 plug. You will find that a Europlug complying with EN 50075 and IEC 60884-1 can get approvals from all of the major European approvers. Here is one example

[PSES] 120 ohm CAN cable

Can bus requires a 120 termination, and I have a client that is trying to do it with the bare cable, and I don't know that such cable exists unless custom built. I'm aware of impedance controlled coax but this is just your standard hookup cable in an appropriate jacket. We terminate the line at

Re: [PSES] power plugs

Hello Brian, You can ship Class I devices with a fuse only on one side and with a non-polarized plug as long as the plug is a grounding plug. Mr. Woodgate is correct in his analysis. I have had VDE specifically require the marking of IEC 60950-1 section 2.7.6 for this situation. That clause is

Re: [PSES] power plugs

In Europe, Euro plug is widely used and accepted although each country may have their own plug. As in EN standard, the product must be fitted with the plug in the country where the product is sold. Is Euro plug legally correct in those countries? I have learnt that it is allowed as the populatio

Re: [PSES] power plugs

In message <8c72bcefe2534b959ba5f70e54e25...@tamuracorp.com>, dated Tue, 24 Jan 2012, Brian Oconnell writes: Thought about this plug, but CEE77 fits German CEE74, so could be polarity reversal? Some of my custom products only have line fused (customer's requirements), so cannot allow my facto

Re: [PSES] power plugs

Hello Ted, Thought about this plug, but CEE77 fits German CEE74, so could be polarity reversal? Some of my custom products only have line fused (customer's requirements), so cannot allow my factory to ship affected Class I stuff with this cord. So when will EU/EFTA code get these plugs and socke