Re: [time-nuts] For those that insist on using switching power supplies
> Whether they actually met it, then pulled the interference supression parts > off the board as a "cost reduction" as is common in no-name computer power > supplies, or whether it never met it to begin with, is for you to speculate. I only watched the first part of the video. I'm surprised nobody has mentioned it yet, but there are clearance requirements on the routing of line power signals vs ground. The board looked like standard digital spacing. > Some suppliers will explain to you that "CE" means China I expect there are trademark issues. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] For those that insist on using switching power supplies
Benchtop linear power supplies also share in some deceptive marketing regarding noise. Some have horrible 1/f noise, others are on par to a tl431, which isn't too bad. Some will have spurious tones 10's of dB above the Gaussian noise spectrum. Unfortunately most linear power supplies only spec a total rms noise over 20 Hz - 20 MHz. Whether that's a flat power spectrum or a handful of tones, is a test it and see senario. On Wednesday, 12 October 2016, Pete Lancashire wrote: > Although this link > > http://www.righto.com/2012/10/a-dozen-usb-chargers-in-lab-apple-is.html > > is about the little Line to 5V USB adapters one sees everywhere now days, > it does show how crappy the output looks when one gets a 'bargin' > > -pete > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] For those that insist on using switching power supplies
On Thu, 13 Oct 2016 20:07:41 -0500 David wrote: > That confusion between the European Economic Area CE and the China > Export CE is just shrewd. It's an outright lie https://en.wikipedia.org/wiki/CE_marking#China_Export Attila Kinali -- Malek's Law: Any simple idea will be worded in the most complicated way. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] For those that insist on using switching power supplies
Even if they meet the CE or FCC requirements for unintentional radiators, they can still screw up the short wave bands and more; many are bad enough that I can see the noise they emit on an oscilloscope with a shorted probe. At least in the US, there are a *lot* of cheap products with switching regulators which cause problems including CFL and LED lamps and FCC enforcement is poor. That confusion between the European Economic Area CE and the China Export CE is just shrewd. On Thu, 13 Oct 2016 17:57:02 -0500, you wrote: >Actually, if they have the "CE" stamp on the product, then they have very >specific radio interference limits that they must test and meet. >It must have been tested, certified, and the certification package >available for inspection. > >Whether they actually met it, then pulled the interference supression parts >off the board as a "cost reduction" as is common in no-name computer power >supplies, or whether it never met it to begin with, is for you to >speculate. Some suppliers will explain to you that "CE" means China >Export, not that it meets the consolidated European safety and electrical >rules. > >--- Graham ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] GPIB on an HP5335A with TimeLab
First, let me say that as a novice time-nut using a Prologix GPIB-Ethernet controller and TimeLab for the first time... WOW! THAT IS SO COOL! IT IS AMAZING AND JUST WORKS! NEATO! I really am blown away by this... I have never before been able to do this sort of thing and I am just amazed. As I am no expert and just starting out, I would surely appreciate some "top tips" on what to do and what not to do. Specifically: 1) How to set up the HP5335A counter for a good measurement. I am still slogging through the Operation Manual and it is slow going. I think I understand what some of the knobs, buttons, and switches do, but I would benefit from knowing how to set it up for frequency measurements as well as comparisons between the A and B input. 2) Thanks to Nick Sayer, I've a very good GPS Disciplined OCXO, and want to be sure that I am using it properly when connected to the HP5335A. I had assumed that I would want that as the B input, but now I am thinking I should run it into the back of the counter for the Time Base IN (provided that the signal meets the requirements). Benefits of this approach? 3) A quick lesson in TimeLab so that I can create graphs that make sense and are what the experts here on the list are accustomed to seeing. No reason to spend days at a measurement if the result is undecipherable. Any more places I should spend money to insure quality measurements and optimum fun? I've nearly tapped out the budget for this quarter by getting the GPIB-Ethernet, but it is well worth every penny. I knew such a thing was possible, but had never dreamed that with just two pieces of equipment and some (very nice) free software, I would be up and running in 5 minutes. A huge thank you to the list for existing; I may not follow every discussion that floats by, but with every message brings a new opportunity to learn something. Thanks again, and I surely appreciate the assistance! Cheers! -Randal R. (at CubeCentral) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] For those that insist on using switching power supplies
.but can you listen to the radio in the car ?? Many of these things will kill other applications like broadband over twisted pair and PLT tv extension. Never mind killing you! Alan G3NYK - Original Message - From: "Van Horn, David" To: "Discussion of precise time and frequency measurement" Sent: Thursday, October 13, 2016 2:05 PM Subject: Re: [time-nuts] For those that insist on using switching power supplies To be fair here, phone chargers have almost no requirement to be quiet other than conducted and radiated emissions limits. It's charging a battery. As a designer of some fairly quiet SMPS systems, this feels like "look how bad a family car this tractor is". ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] For those that insist on using switching power supplies
Actually, if they have the "CE" stamp on the product, then they have very specific radio interference limits that they must test and meet. It must have been tested, certified, and the certification package available for inspection. Whether they actually met it, then pulled the interference supression parts off the board as a "cost reduction" as is common in no-name computer power supplies, or whether it never met it to begin with, is for you to speculate. Some suppliers will explain to you that "CE" means China Export, not that it meets the consolidated European safety and electrical rules. --- Graham On Thu, Oct 13, 2016 at 5:25 PM, Nick Sayer via time-nuts < time-nuts@febo.com> wrote: > > > On Oct 13, 2016, at 6:05 AM, Van Horn, David backcountryaccess.com> wrote: > > > > To be fair here, phone chargers have almost no requirement to be quiet > other than conducted and radiated emissions limits. > > It’s charging a battery. > > Not quite. They power the device in question *while* they’re charging the > battery. Now, I’ll admit that powering a phone is a much lower bar than > powering, say, an audio amplifier, but I’d also say that some of the > devices on that page were pumping out way more garbage than even any > digital system should have to put up with. > > > > > > As a designer of some fairly quiet SMPS systems, this feels like “look > how bad a family car this tractor is". > > Well, there’s some of that, but the worst offenders were counterfeit > devices that were pumping out unreasonable levels. To your analogy, they > were the outer shell of a family car with a the engine from an Edsel > installed in it without a muffler or any emissions controls fed from an > open bucket of gasoline sitting on the passenger’s seat. > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] For those that insist on using switching power supplies
> On Oct 13, 2016, at 6:05 AM, Van Horn, David > wrote: > > To be fair here, phone chargers have almost no requirement to be quiet other > than conducted and radiated emissions limits. > It’s charging a battery. Not quite. They power the device in question *while* they’re charging the battery. Now, I’ll admit that powering a phone is a much lower bar than powering, say, an audio amplifier, but I’d also say that some of the devices on that page were pumping out way more garbage than even any digital system should have to put up with. > > As a designer of some fairly quiet SMPS systems, this feels like “look how > bad a family car this tractor is". Well, there’s some of that, but the worst offenders were counterfeit devices that were pumping out unreasonable levels. To your analogy, they were the outer shell of a family car with a the engine from an Edsel installed in it without a muffler or any emissions controls fed from an open bucket of gasoline sitting on the passenger’s seat. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] For those that insist on using switching power supplies
To be fair here, phone chargers have almost no requirement to be quiet other than conducted and radiated emissions limits. It's charging a battery. As a designer of some fairly quiet SMPS systems, this feels like "look how bad a family car this tractor is". ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Open call: Leap Second Festival 2016
Hi everyone, Being new to this mailing list but not completely new to the topic I'd like to share with you the information about upcoming leap second festival :) Best, rad0van. == :60 Leap Second Festival CALL for WORKS Leap Second Festival 2016 Open call: Projects and works lasting one second or less. Submission deadline: 24.12.2016 Contact info: leap...@noemata.net The festival takes place New Year's Eve, 31th December 2016 23:59:60 UTC on the extra leap second squeezed in between 2016 and 2017. During this second all the projects and works will be exhibited, performed, and executed. LEAP SECOND FESTIVAL 2016: "JUST A SEC..." - AN UNTIMELY INTERVENTION For the 2016 festival we are looking for works that emphasize a collaborative, experimental, project-based approach that in various ways embed the leap second idea and function as events in themselves. With its awkward and impossible format, the focus of the festival is a questioning of art and its appearance, materiality, objecthood, phenomenology, or their negations or impossibilities, leading to an exploration of media in search of itself as an appearing/disappearing form or questioning/rejecting it. How can an artistic practice catch/reflect/express such a precarious situation, an uncertain non-event, an immaterial/virtual moment, an untimely, unsuitable intervention? And how can it challenge exhibition models and force new ways of disseminating works? We're also looking for projects and works exploring deviation, glitch, and wobble; interventions in and hacking of the machination of time; reality check and celebration of natural cycles alining systemic/conceptual cycles; precarity as an unpredictable and insecure condition of a technology of time and production affecting material/physical and social/psychological welfare; a marginal and intermittent existence, short and discontinuous, autonomous and freely self-inserted/-exploited/-realized/-precarizated; untimely art, out of time, out of order, out of line, a defiant leap. ABOUT The Leap Second Festival is a distributed, decentralized event for art, technology and precarity, coordinated on the net. This is the third festival in the series. The festival is held on leap seconds announced by IERS (International Earth Rotation and Reference Systems Service). The previous festivals in 2015 and 2012 saw more than 100 works worldwide, from split-second videos, audio and musical works, to conceptual- and instructional art, network- and timespecific performances, and sculpture. The festivals have support from the Arts Council Norway. The Leap Second Festival 2012 and 2015 catalogues are available at http://noemata.net/leapsec26/ and http://noemata.net/leapsec/ Deadline submission: 24.12.2016 Leap Second Festival 2016: 31th December 23:59:60 - 1st January 2017 00:00:00 UTC Contact/Submit proposal: leap...@noemata.net ORGANIZERS Ars Publica/noemata - http://www.noemata.net BrowserBased group - http://www.browserbased.org -- Connection closed by remote ghost. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP 59309A Clock runs, sets via GPIB, but no GPIB output?
I am out of town but will be back over the week end. All uploads will be sorted by then. Didier KO4BB On October 11, 2016 1:54:06 PM EDT, Francesco Messineo wrote: >1818-2295A dump has been uploaded to ko4bb site, probably there's need >to be moved in the right place before it's available. > >On Mon, Oct 10, 2016 at 9:32 AM, Francesco Messineo > wrote: >> Hi Dave, >> right, once I find the dumps, I'll upload them. >> thanks >> Frank IZ8DWF >> >> On Mon, Oct 10, 2016 at 9:24 AM, Artek Manuals > wrote: >>> Frank >>> >>> One of the best places to store ROM dumps for easy access by everyon >is >>> KO4BB.com >>> >>> Dave >>> NR1DX >>> dit dit >>> >>> On 10/10/2016 3:20 AM, Francesco Messineo wrote: I have a dump of the 1818-2295A somewhere, it should be archived in one of my backups. I also made a replacement with a board having 2 >x 28C64 SO-28 eeproms and it worked in my 59309A as far as I could >test it. However these eeproms present many glitches on the outputs >during address toggling, so it's way better to use a suitable CPLD after recovering the equations (I'm a bit stuck on this project due to >lack of time...). If someone needs the dump, just let me know and I'll dig it out. HTH Frank IZ8DWF >>> >>> >>> >>> -- >>> Dave >>> manu...@artekmanuals.com >>> www.ArtekManuals.com >>> ___ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >___ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. -- Sent from my Moto-X wireless tracker while I do other things. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Prologix USB-GPIB Controller
I buy a lot of stuff from eBay and Amazon, including batteries on occasion. Invariably, there has been a pretty good correlation between price and quality, but considerably more so with batteries. It really sucks paying $100 or more for a quality OEM laptop battery, but the alternative is to throw away $40 and getting junk that at best will not be very useful and at worse will burn your house. Batteries are a tough business, ask Samsung... Didier KO4BB On October 10, 2016 1:13:45 PM EDT, "Dr. David Kirkby (Kirkby Microwave Ltd)" wrote: >On 10 October 2016 at 09:35, Charles Steinmetz >wrote: > >> Poul-Henning wrote: >> >> And for voltage references, "pre-owned" is likely to mean "better". >>> >> >> Perhaps, but third-world recyclers are not known for gentle treatment >> during the parts removal process. > > >I had some cheap ($10) GPS receiver boards shipped to me in a plastic >kitchen bag from yikunhk on eBay. 4 boards in the same bag, all >scratching >each other. The bag was not anti-static. > >There are all number of possible explanations of why boards can be made >so >cheaply, when the ICs appear to cost more than the boards. > >* The chips are counterfeit >* The chips are similar to what they are supposed to be, but have been >relabeled. >* They are made at the same factory as the real devices, on what I've >heard >described as the "ghost shift", where they are not officially made, but >are >the same devices. >* They are recycled. >* They are stolen. > >It is anyone's guess once you start buying semiconductor devices from >eBay. >Maybe you are lucky, maybe you are not. > >You dramatically increase the probability a part is good if sourced >from a >reputable source (e.g. RS or Farnell in the UK). That is not to say >that >the parts are not counterfeits, as even the best suppliers can get >caught, >but they are more likely to be ok. > >I recently bought a supposedly original Samsung battery for my Samsung >Galazy S3 phone from a local shop. The phone had all sorts of issues >with >this battery, so I concluded it was a poor counterfeit. I thought I'd >be >safe buying directory from Amazon (not a 3rd party), but on reading >reviews >on Amazon, I was not convinced those were genuine Samsung batteries >either, >so I did not buy from Amazon. > >Eventually I bought a battery from the Samsung website. The phone now >works >ok. I don't know if Samsung actually make the batteries themselves, >but I >think I have a better chance of buying from the Samsung website than >from >anywhere else. > >I've had "Duracell" batteries leak. At one time I used to blame >Duracell, >but now it has cross my mind whether they might have been bought on >eBay >and were counterfeits. I can't recall where they were purchased, but >now I >will only purchase batteries from sources I consider reputable. > >Dave. >___ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. -- Sent from my Moto-X wireless tracker while I do other things. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
