On 10/09/15 11:19, Dimiter_Popoff wrote:> On 10.9.2015 г. 12:23, Tom Gardner wrote: >> On 10/09/15 07:42, Dimiter_Popoff wrote: >>> I suppose I can get used to "us" instead of "uS", but may be an >>> option would be se-6 or sE-6... I still can't quite swallow the >>> thought that S is invalid for seconds. I looked at my very >>> old tek 465B, well, its front panel is also designated with >>> lower case around the timebase knob. >> >> It more often occurred on their on-screen displays, e.g. >> the first one I came across: http://www.jvgavila.com/t7d20_w1.jpg > > I now remember seeing that as well on newer scopes than my 465B > (which works and I am not planning to part with, it was THE scope > back in the day when I wanted to build one I was looking up to :-). > I may well have taken it from there. > > I suppose the capital S is justified though. While invalid in "normal" > text, put into context - as on a scope display - it deals with the > "us" ambiguity which might be annoying at a subconscious level > not only to me. Well I may only be looking for an excuse to not > start changing the S in the spectrometry software on our devices :-).Some Tek scopes had curve-tracers, and one of the principal characteristics of FETs is their conductance - measured in Siemens (S). Hence it might not be unambiguous on a Tek display! Nowadays, "S" often means samples, as in S/s. While the purist in me still prefers "Sa/s", I don't find "S/s" so visually jarring as "uS". So, I hope your spectrometry software never has to display anything w.r.t. samples.
Can you turn off Pipeline in ARM Cortex M3
Started by ●September 8, 2015
Reply by ●September 10, 20152015-09-10
Reply by ●September 10, 20152015-09-10
On 10.9.2015 г. 14:01, Tom Gardner wrote:> On 10/09/15 11:19, Dimiter_Popoff wrote: >> On 10.9.2015 г. 12:23, Tom Gardner wrote: >>> On 10/09/15 07:42, Dimiter_Popoff wrote: >>>> I suppose I can get used to "us" instead of "uS", but may be an >>>> option would be se-6 or sE-6... I still can't quite swallow the >>>> thought that S is invalid for seconds. I looked at my very >>>> old tek 465B, well, its front panel is also designated with >>>> lower case around the timebase knob. >>> >>> It more often occurred on their on-screen displays, e.g. >>> the first one I came across: http://www.jvgavila.com/t7d20_w1.jpg >> >> I now remember seeing that as well on newer scopes than my 465B >> (which works and I am not planning to part with, it was THE scope >> back in the day when I wanted to build one I was looking up to :-). >> I may well have taken it from there. >> >> I suppose the capital S is justified though. While invalid in "normal" >> text, put into context - as on a scope display - it deals with the >> "us" ambiguity which might be annoying at a subconscious level >> not only to me. Well I may only be looking for an excuse to not >> start changing the S in the spectrometry software on our devices :-). > > Some Tek scopes had curve-tracers, and one of the principal > characteristics of FETs is their conductance - measured in > Siemens (S). Hence it might not be unambiguous on a Tek display! > > Nowadays, "S" often means samples, as in S/s. While the purist > in me still prefers "Sa/s", I don't find "S/s" so visually > jarring as "uS". > > So, I hope your spectrometry software never has to display > anything w.r.t. samples.The software does not talk of samples indeed but it does display them in an oscilloscope window (the input signal is continuously digitized at a few megasamples/s). However in all references I have been consistent with the capital s for seconds.... I write MspS IIRC :-). But these are for internal usage, I have deliberately avoided giving figures on that - it is too low level to be of interest to most customers and I have had more than one wannabe cloner (none successful, if they knew what they were trying to do they would never have tried) - why save them some head scratching and scope probing :-). I do have a cpS (or CpS, not sure now) (counts per second) in at least one of the result windows. Dimiter
Reply by ●September 10, 20152015-09-10
On 10/09/15 12:26, Dimiter_Popoff wrote:> I write MspS IIRC :-)And measure power station output in mW and FM band frequency in mHz or Mhz? :) The next misstep would be to measure power in MWh or energy in MW but I'm sure you wouldn't fall into that trap! (Unlike others, typically w.r.t. green energy :( )
Reply by ●September 10, 20152015-09-10
On 10/09/15 12:38, Tom Gardner wrote:> On 10/09/15 12:26, Dimiter_Popoff wrote: >> I write MspS IIRC :-) > > And measure power station output in mW and > FM band frequency in mHz or Mhz? :) > > The next misstep would be to measure power in MWh > or energy in MW but I'm sure you wouldn't fall > into that trap! (Unlike others, typically w.r.t. > green energy :( )When feeling perverse I like to measure velocity in furlongs per fortnight, or time in nano-centuries. (1 nc ~= pi s) Best not to ask about gallons, hundredweights and ton.*s
Reply by ●September 10, 20152015-09-10
Well MW is a megawatt and mW is a milliwatt, that is no problem. MHz for megahertz etc., M fot mega and m for milli is standard I think. Dimiter (posting from a phone on a bus using google groups mobile, let us see what a mess that will produce :). I tried to copy/paste the text I wanted to quote, was hopeless so I gave up on that.)
Reply by ●September 10, 20152015-09-10
Tom Gardner <spamjunk@blueyonder.co.uk> writes:> On 10/09/15 08:51, John Devereux wrote: >> Tom Gardner <spamjunk@blueyonder.co.uk> writes: >>> One of my projects, when I get A Round Tuit, is to make a 2GS/s >>> 4GHz scope. The trick is to find a way to do it with only trivial >>> analogue front end components. Hence no amplifiers, no ADCs, just >>> a 50ohm input with very simple analogue components. Yes, there >>> will be limitations, but that's half the fun :) >> >> Hmm, there was the "slideback sampler" that John Larkin and Mike Monet >> used to fight about, a decade or two ago in sci.electronics.design. > > As far as I can tell from mostly dead links, similar > but not quite the same.Hey I archived one of them <http://ee.devereux.me.uk/20150910130650.pdf>> Given that it is solely a hobby project, I would expect > my performance to be worse. For example, if someone mentions > jitter then I will shut my eyes, put my hands over my ears > and sing "la la la".-- John Devereux
Reply by ●September 10, 20152015-09-10
On 10/09/15 13:07, dp wrote:> Well MW is a megawatt and mW is a milliwatt, that is no > problem. MHz for megahertz etc., M fot mega and m for > milli is standard I think.Just so. Hence mW for a power station output indicates a certain, um, lack of ambition.
Reply by ●September 10, 20152015-09-10
On 10/09/15 13:10, John Devereux wrote:> Tom Gardner <spamjunk@blueyonder.co.uk> writes: > >> On 10/09/15 08:51, John Devereux wrote: >>> Tom Gardner <spamjunk@blueyonder.co.uk> writes: >>>> One of my projects, when I get A Round Tuit, is to make a 2GS/s >>>> 4GHz scope. The trick is to find a way to do it with only trivial >>>> analogue front end components. Hence no amplifiers, no ADCs, just >>>> a 50ohm input with very simple analogue components. Yes, there >>>> will be limitations, but that's half the fun :) >>> >>> Hmm, there was the "slideback sampler" that John Larkin and Mike Monet >>> used to fight about, a decade or two ago in sci.electronics.design. >> >> As far as I can tell from mostly dead links, similar >> but not quite the same. > > Hey I archived one of them > > <http://ee.devereux.me.uk/20150910130650.pdf>Ah, thanks. No, that isn't exactly the technique I'm planning on using, and I haven't assessed the relative advantages and disadvantages.
Reply by ●September 10, 20152015-09-10
On 9/10/2015 3:10 AM, Jan-54 wrote:> On Wed, 09 Sep 2015 17:32:50 -0500 > Tim Wescott <seemywebsite@myfooter.really> wrote: > >> On Wed, 09 Sep 2015 22:32:38 +0100, Tom Gardner wrote: >> >>>> Let's try "μ" which is simply a "special character" >> >> It worked for me. >> >> I'll stick with 'us'. >> >> You could use 'mms'. >> > > Or going deviant bigtime, follow the Pharmaceutical industry and > use 'MC' ?What is the "C"? Oh, "MC" means micro! Yeah, I hear they kill people with that labeling issue. -- Rick
Reply by ●September 10, 20152015-09-10
On 9/10/2015 4:53 AM, David Brown wrote:> On 10/09/15 09:16, rickman wrote: >> On 9/10/2015 3:05 AM, David Brown wrote: >>> On 09/09/15 23:30, Tom Gardner wrote: >>>> On 09/09/15 21:56, Dimiter_Popoff wrote: >>>>> [uS is what I would >>>>> have written, how am I supposed to do that now? "us" is more ambiguous? >>>>> Tom?] >>>> >>>> :( >>>> >>>> Prepend a number :) >>>> >>>> More seriously I have seen a "micro" character in some usenet posts. >>>> I wonder how it got there, and whether other people's clients rendered >>>> it correctly. >>>> >>>> Let's try "μ" which is simply a "special character" inserted into >>>> an OpenOffice document then copied/pasted into this message, which >>>> I'm composing in SeaMonkey. Since it can also be copied/pasted >>>> into a linux/bash command line in the xfce terminal emulator, there's >>>> cause for hope. >>>> >>>> If it works I don't know whether I'll use it every time and become >>>> a major nitpicker with those that don't! >>> >>> µs works fine for me. As long as readers have a reasonably modern >>> newsreader, there should be no problem with the letter "mu" for micro - >>> it is a standard character in the standard fonts on most systems. If >>> someone has customised their desktop or newsreader to use a weird font >>> with a more limited character range, then it might show up oddly. If >>> there are any fans of command-line newsreaders, they should also see it >>> if they have a utf-8 locale on their systems. >>> >>> As for typing it, that depends on your system and your keyboard. >>> Windows is (as always) more limited. It should be easy for most >>> non-English keyboard layouts, which separate the "Alt" and the "Alt Gr" >>> keys - on my Norwegian keyboard layout, it's just AltGr-m. But if that >>> doesn't work, character map is probably the least inconvenient method >>> unless you can remember the Alt + numeric keyboard sequence. >>> >>> For Linux, you have other options. Again, depending on the keyboard >>> layout, AltGr-m is likely to work - certainly on my Norwegian layout I >>> can get a wide range of characters with combinations of AltGr, shift, >>> and different keys. Then there is also the "compose" key - typically, >>> this is not assigned by default, but you can set it up if you want it (I >>> use the "scroll lock" key as compose). Then µ is compose + m + u. >> >> Along with the often used >> >> ° - Alt-0176 > > Shift-AltGr-0 or Compose+o+o gives me ° > >> ± - Alt-0177 > > AltGr-+ or Compose+++- gives me ± > > Both of these work in Linux, but not Windows. > >> >> mu is >> µ - Alt-0181 >> >> The zero is very important. Without it you get other chars.What is AltGr? -- Rick
