Are low/lower cost USB Oscilloscope's any good?
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From: Phil Allison on 14 Dec 2006 21:26 "Joel Kolstad" "Phil Allison" >> ** That is not the same scope and it is priced much higher. > > You're correct, I looked closely and there are some minor differences. > The actual specs appear the same, though -- I'd wager they're made by the > same OEM, and it's the same basic design. ** What a fool like YOU would foolishly wager is of no relevance either. > The price is double, but comparing the price of anything on eBay to the > pricing in a brick and morter store (especially when you have to throw in > a currency conversion!) is irrelevant. ** More asinine bollocks - it a simple fact. Aussie DSE stores are selling the scope I referred to at half the price US eBayers are being asked to pay for the mail order one you found. >> ** What you "really think" is not of much value to anyone. > > You're entitled to your opinion. :-) ** You are just full of narcissistic & irrational opinions. >> Old Teks are basically boat anchors. > > Depends on how old you get... ** Yawn - more silly obfuscation. >>> I wonder how much storage tubes cost to manufacture? The Q1803 would >>> probably have a lot more takers if it could >>> freeze the trace so that it would work for troubleshooting, e.g., >>> non-repetitive serial communications. >> >> ** Not a requirement at all for most scope users. > > That's a very arbitrary statement. ** It is a very simple fact. ( snip more of this asinine geek's opinionated crapology) >> Digital geeks have an extraordinarily narrow idea what "troubleshooting" >> is. > > For many of them, sure.. ** I was talking about YOU - you dumb fuckhead. No wonder your thinking is so narrow - with that extraordinary pointy head of yours. LOL ! ........ Phil
From: Joel Kolstad on 15 Dec 2006 12:55 Hi Phil, "Phil Allison" <philallison(a)tpg.com.au> wrote in message news:4uefduF17j5r4U1(a)mid.individual.net... > Aussie DSE stores are selling the scope I referred to at half the price US > eBayers are being asked to pay for the mail order one you found. Correct; my point was that -- in this particular case -- the price doubling doesn't imply they're not still 99% the same scope. Here in the U.S., PlayStation 3's that retailed for $599 were going for several thousand dollars the week after they first came out. I bet someone down in Oz even paid that much... maybe you? >>>> I wonder how much storage tubes cost to manufacture? The Q1803 would >>>> probably have a lot more takers if it could >>>> freeze the trace so that it would work for troubleshooting, e.g., >>>> non-repetitive serial communications. >>> ** Not a requirement at all for most scope users. >> That's a very arbitrary statement. > ** It is a very simple fact. You're completely out of touch with reality, then. >>> Digital geeks have an extraordinarily narrow idea what "troubleshooting" >>> is. >> For many of them, sure.. > ** I was talking about YOU - you dumb fuckhead. Well, given that I don't do much digital design these days -- other than a bit of glue logic here or there --, your argument doesn't really apply. ---Joel
From: jasen on 16 Dec 2006 20:18 On 2006-12-16, jasen <jasen(a)free.net.nz> wrote: > > not the same scope, it's 3lb heavier, and has buttons where the DSE one has > sliders (and runs on 120V), > > Phil found the exact same scope on farnell's site for three times the price. > they were out of stock, (possibly inventry knows more than sales) > the brand this time is "CALTEK", > > Farnell have another one: brand "DIGIMESS", even more expensive, but the only > images for it are a blurry catalogue photo (pdf page) and the line art in > manual (pdf), it looks like the same scope to me. the published schematic is slightly different though. -- Bye. Jasen
From: vasile on 16 Dec 2006 23:27 Joel Kolstad wrote: > For many of them, sure... but consider that these days the "high-end" digital > guys are doing things like troubleshooting 10Gbps data streams, and this > requires plenty of extraordinarily high-end equipment. There's a good reason > why Tek's "Which oscilloscope is right for you?" page -- > http://www.tek.com/products/oscilloscopes/selection_chart.html -- lists > "high-speed serial" first on their 15GHz real-time scopes "Which oscilloscope is rigth for your pocket" maybe ? :) Here is good one as a price/performance if you like to use your laptop. http://www.dynoninstruments.com/ But i'm searcing for a PCMCIA PC scope, do you know any ? greetings, Vasile
From: David L. Jones on 17 Dec 2006 00:25
news.valornet.com wrote: > Hi, > > I am just trying to mess around with electronics stuff, and I don't know too > much, but I've put a circuit or two together with help from this forum and > others. I've got a fluke DMM and clampmeter, but I'd really like to be able > to scope some stuff sometimes. I just don't know if I could part with the > money for a portable scope like a fluke 123 however just for playing around. > I have some questions and appreciate any suggestions for what might be good: What you want for starters is a proper analog scope. A 20MHz dual trace model is a basic starting point, or even the 10MHz single channel Phil pointed out. You can get cheap 2nd hand scopes on eBay and surplus gear sellers. > 1. Do most scopes have decent voltage input on them? For example, can you > hook most of them up to line power (120vac or 240vac)? I am assuming the > fluke can do this no sweat, but I don't know. DON'T muck around with probing the mains unless you know exactly what you are doing. If you want to do it *safely* you need a proper high voltage differential isolating probe, and these are not cheap. > 2. I also see a bunch of references to X10 probes. Are these used to > reduce the voltage to something a scope can use, for example 240VAC --> > 24VAC ? x10 probes are used for probing higher speed signals. In most normal cases you would use a x10 probe. > 3. Do you have any recommendations for a scope that works on a notebook > that is relatively low cost that has decent features (keep in mind I have no > idea what features you would want in a scope). If you want to capture weaveform (for example, analysing a serial digital signal) then you need either a digital stoage scope (DSO), or a PC based one. In any case, you should get a real analog oscilloscope as well for general purpose use. With DSO's, memory depth and sample rate are the top two requirements. The more the better. > I would even consider some of these scopes that are free based ones that > work with a sound card, but my question is, what type of voltage input can > you get with a microphone jack??? If you really want to work on high voltage gear, you MUST get a proper differential probe. Anything else mixed with lack of experience will either kill you or your equipment. Dave :) |