As far as the world of Chinese made DSOs I've heard pretty good things about what Hantek's has to offer. Their DSO5000B series[2] (and similar) scopes are, like the Rigol that became so popular when their 70 MHz model was found to be easily software upgradable to 200 MHz[1], are nearly as easy to upgrade from 60 MHz of bandwidth to 100 MHz and even 200 MHz[3]. Unfortunately, the newer scopes are a bit more work as companies have learned from their mistakes and now ship the lower end models with handicapped frontends. Fortunately, it only requires a very tiny handful of slightly higher precision resistors to get the frequency response up to that of the higher end models[4]. Compared to the DS2072 from Rigol you get a deeper memory (1M vs 256k, if memory serves), 2 GS vs 1 GS, and from what I've heard, a nicer display. The way I understand it both Rigol and Hantek in this range are simply rebadged Tekway devices.
That being said, as others have already mentioned, $350 for a Tek 2252 isn't a bad deal. I'd be willing to bet that an old Tek like that will still be alive and testing long after a Tekway/Hantek/Rigol that was unboxed today. If I had the space I'd take a 2235, 2465, 2252, 2265, or any other analog monster from then. Though, to honest the Tek 468/475/485 beasts have a special place in my heart. Even my girlfriend would likely leave me if I brought one home I'd take a working 7000 series modular *badboy *in a second; I'd get rid of my television, watch it's beautiful green traces, and heat my front room with it if I had to (yeah, I need help). [1] http://freneticrapport.blogspot.com/2013/07/raspberry-pi-rigol-ds2072-200mhz.html [2] http://www.hantek.com/en/ProductDetail_3.html [3] http://www.eevblog.com/forum/testgear/hantek-tekway-dso-hack-get-200mhz-bw-for-free/ [4] http://www.eevblog.com/forum/testgear/hantek-tekway-dso-hack-get-200mhz-bw-for-free/msg212054/#msg212054 On Fri, Aug 1, 2014 at 7:53 AM, Dawes, Andrew M. <[email protected]> wrote: > We’ve built our own based on AD chips like the AD5932 and relatives. > These are a few dollars per chip and the $$ tracks top frequency (more or > less). Some have 1.5 GHz outputs for ~$100. > > > http://www.analog.com/en/rfif-components/direct-digital-synthesis-dds/ad5932/products/product.html > > These cheaper boxes are likely packaged AD chips, i.e. they added power > supply, BNC output, LCD panel etc. In other words, even if the thing really > breaks and stops working, you could drop in another $5 chip and use the > front end hardware for your own device. > > -Andy > > > -- > Andrew M.C. Dawes > Associate Professor of Physics > Pacific University > amcdawes.com > > On August 1, 2014 at 5:24:44 AM, Paul Stoffregen ([email protected]) wrote: > > > Also I noticed that the Rigol model he mentioned comes with an optional > function generator for $250 more [Model DS1074Z-S] which might save money > over buying one separately. > > > Something to consider with built-in extras is the shared user interface. > On a scope, you'll access this stuff using the menus, which are already > packed with tons of scope features. Budget scopes have lots of crafty ways > to share knobs, like only 1 set of vertical controls among all channels & > math. It usually works pretty well, with only minor inconvenience for > saving a lot of $$$, but those menus do tend to get pretty crowded. > > With a dedicated function gen, you get a big knob to vary the amplitude > and/or frequency, buttons to change waveform and settings, and usually a > display that shows what it's doing. The controls are optimized for the > function generator features, which makes using it quite a bit easier and > more natural than a function generator shoehorned into the scope's menu > system. > > If it were under $100, of course the decision would be easy. There are > many dedicated DDS function generators in the $250 to $350 range, and a lot > of used gear well under $250. If you only need basic signals at modest > frequency and you don't need the frequency stability of DDS, there are a > lot of old/used but good quality analog function generators under $70. > > There's also some really cheap DDS stuff out there now, which might > actually work? If anyone actually takes a chance buying these, or already > has one, I'd be really curious to play with it sometime at a Monday meetup. > > > http://www.ebay.com/itm/10MHz-DDS-Function-Signal-Generator-Carrier-Debugging-Source-Frequency-Counter-/281310662043?pt=LH_DefaultDomain_0&hash=item417f6c0d9b > > > http://www.ebay.com/itm/2MHz-Dual-Channel-DDS-Function-Signal-Generator-Sine-Square-Wave-Sweep-Counter-/111407197529?pt=LH_DefaultDomain_0&hash=item19f062ed59 > > > http://www.ebay.com/itm/2MHz-DDS-Function-Signal-Generator-Frequency-Counter-Square-Wave-Sweep-BNC-TTL-/281295638078?pt=LH_DefaultDomain_0&hash=item417e86ce3e# > _______________________________________________ > dorkbotpdx-blabber mailing list > [email protected] > http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber > > > _______________________________________________ > dorkbotpdx-blabber mailing list > [email protected] > http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber >
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