Re: [PSES] Highest clock frequency in a device.

There is a general misconception that only the highest clock rate determines the frequency range of test. The definitions in the standards are not specific to clock frequencies, but rather to the frequencies generated or used. FCC: "Highest frequency generated or used in the device or on which

Re: [PSES] Highest clock frequency in a device.

Highest clock! not data rate. Rodney Davis From: Robert Dunkerley Sent: Friday, January 29, 2016 8:56 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Highest clock frequency in a device. How would you treat a piece of IT

Re: [PSES] Highest clock frequency in a device.

I posed that question to the FCC many years ago and got the answer that the transmitter operating frequency now becomes a frequency of the host device. Therefore a device that operates at, say 50 mHz but has a Wi-Fi transmitter installed shall be tested to the frequency specified in 15.33

Re: [PSES] Highest clock frequency in a device.

How would you treat a piece of IT equipment that had say a 10Gbit/s Ethernet port? Do you just treat this as 10GHz, and use that as the highest clock? Rob. -Original Message- From: Bill Stumpf [mailto:bstu...@dlsemc.com] Sent: 29 January 2016 13:48 To: EMC-PSTC@LISTSERV.IEEE.ORG

Re: [PSES] Highest clock frequency in a device.

On 1/28/2016 2:42 PM, Chuck McDowell wrote: To quote from BS EN 55032:2012 with 2014 update 3.1.19 highest internal frequency Fx highest fundamental frequency generated or used within the EUT or highest frequency at which it operates NOTE This includes frequencies which are solely used

Re: [PSES] Highest clock frequency in a device.

> Hmm. An on-board WiFi device "uses" (non-clock) GHz range frequencies -- internally. That would be an intentional transmitter though and covered by different FCC rule part / EU standards Charlie -Original Message- From: Cortland Richmond [mailto:k...@earthlink.net] Sent: 29 January

[PSES] AU CISPR 22 Class B Interpretation

Group, My customer builds vehicular laptop and tablet docking stations intended for hard mounted use within emergency vehicles such as police and ambulance, as well as work trucks and forklifts. The vehicular power supply narrowly missed CISPR 22 radiated Class B limits. Then their AU

Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation

These vehicles travel between residential and commercial zones on a regular basis, so on that alone I would agree with the class B assessment, but I'm wondering if you don't have lots of other EMC issues to deal with - automotive immunity etc. The only time I've personally seen an exemption

Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation

Correct - CISPR22 not scoped for automotive end-use installation. And there is additional stuff for ambulance (60601-1-2), where there are additional immunity and emissions requirements. Also, class A stuff will probably degrade P25 and TETRA radio systems. Methinks mundane ACMA requirements

Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation

Gary, With regard to auto EMC compliance, that is taken care of already. This hardware is being subjected to AU/NZS CISPR 22 simply to satisfy AU ACMA requirements. I appreciate your comments concerning the residential zone, but I don't agree that simply because a vehicle may travel

Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation

Brian, I disagree that the fact that this device is an automotive device excludes it from the scope of CISPR 22. ITE is defined primarily by the functionality of the device (displays, stores, communicates, etc). ACMA doesn't exclude vehicles from the requlations. If vehicle accessory

Re: [PSES] AU CISPR 22 Class B Interpretation

Looking at the radiated emission requirements on things that are part of the vehicle, they are much more severe than Class B. And the ambulance/emergency vehicle will be using more of the rf spectrum than the typical ground vehicle, and such use is not entertainment or even navigation, but may be

Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation

Wow how we easily get off topic. What about the simple definition Class A Such equipment should not be restricted in its sale but the following warning shall be included in the instructions for use: Even the authorities indicated Class A in an option but SUGGESTED class B. Good luck... not

Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation

Mr. Newton asked for opinions, so for what it's worth, here is mine. I hope you will all excuse my rant. Many will interpret the "exclusions" based on their viewpoint. Not being associated with a manufacturer, my interpretation may be different than others. The FCC excludes devices used

Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation

The FCC also exempts a digital device utilized exclusively in an appliance, e.g., microwave oven, dishwasher, clothes dryer, air conditioner (central or window), from the its Part 15 technical requirements, so being rational doesn't always make sense. Jim Hulbert -Original Message-

Re: [PSES] AU CISPR 22 Class B Interpretation

Ken, Note that the device has tested per EN 50498 for vehicular EMC compatibility by an accredited auto lab and complies with broadband and narrowband emissions requirements within. I believe that standard is taking mobile communications into account. Also, note that the OP states that

Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation

Not to pile on but our EMC lab has performed testing on a lot of equipment used in an Ambulance and it is always Class B. The reason I was told was because ambulances can go into Residential Areas. We have also tested DC Outboard Trolling Motors for boats which are also class B because

Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation

And, for another perspective, UNECE Regulation 10, "Uniform provisions concerning the approval of vehicles with regard to electromagnetic compatibility", restricts 10m radiated emissions to limits which lie between CISPR Class A and Class B. Ralph McDiarmid Compliance Engineering