Turn your Rigol DS1052E Oscilloscope into a 100MHz DS1102E
in [Design]
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From: Jan Panteltje on 9 Apr 2010 05:50 Chicken anonymous alias the Phantom cried: >And, of course, those are not the ONLY advantages. >time far before the trigger event is a very great advantage. That is actually just the same as storage. you do not even need a trigger, just log everything for a day. No need even for a scope, just store it in some memory, All you need is a counter, some ADC, and FLASH or whatever :-) Because now you are talking about times > milliseconds. For anything shorter, as Tim pointed out, use a reel of coax :-) But get of the heroine habit first to be able to pay for it :-)
From: The Phantom on 9 Apr 2010 06:21 On Fri, 09 Apr 2010 09:50:37 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote: >Chicken anonymous alias the Phantom cried: > >>And, of course, those are not the ONLY advantages. >>time far before the trigger event is a very great advantage. > >That is actually just the same as storage. >you do not even need a trigger, just log everything for a day. >No need even for a scope, just store it in some memory, >All you need is a counter, some ADC, and FLASH or whatever :-) >Because now you are talking about times > milliseconds. >For anything shorter, as Tim pointed out, use a reel of coax :-) >But get of the heroine habit first to be able to pay for it :-) You're scrambling to recover now. What model analog scope which you used when you were growing up was capable of storing many megabytes of data sampled at even as low as 4 gigasamples/second?
From: The Phantom on 9 Apr 2010 06:34 On Thu, 8 Apr 2010 22:26:29 -0500, "Tim Williams" <tmoranwms(a)charter.net> wrote: >"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message >news:ks6tr5h4k5jv51n0lp1is4hrs537v1rmse(a)4ax.com... >> Delay lines can't store milliseconds of pre-trigger data. The best >> they do is let you see a few ns of pre-trigger waveform. > >John John John, > >That's what entire spools of foamed teflon coax are for! ;-) So, let's see. A moderate priced DSO, the Agilent 6000 series, can store 8 million points of data with a sample rate of 2 gigasamples/second. If the propagation speed through the cable is the speed of light (1 foot/ns), we would need 4,000,000 feet of coax to do the job. With a more realistic propagation velocity, this is something like 500 miles of coax. How many analog storage scopes used this technique? > >Man, I can just imagine how many hours of cocaine you could buy for the >price of a few microseconds of that sort of stuff. Seems kind of >disappointing. > >Tim
From: Tim Williams on 9 Apr 2010 06:45 "The Phantom" <phantom(a)aol.com> wrote in message news:ta0ur5lc088fr5e488p2j04hm174o3dj96(a)4ax.com... >>> Delay lines can't store milliseconds of pre-trigger data. The best >>> they do is let you see a few ns of pre-trigger waveform. > > With a more realistic propagation > velocity, this is something like 500 miles of coax. How many analog > storage > scopes used this technique? Dunno, probably none. But notice my post concerned pre-trigger data (quote retained above), which can be obtained for a short period (100s ns?) without *too* much cable. Trying to bring that into the storage domain would be difficult at least. Even for hardline, HF loss on long lengths gets considerable, which suggests zobel filters to correct it, weakening the signal and probably adding lots of even harder to compensate group delay. And this says nothing of trying to regenerate the signal without distortion for more than a few cycles through the line, something which can only be done consistently with an ADC-buffer-DAC. It is for this absurdity that I inserted a "wink" smiley, which should be clearly visible. Anyways, analog storage scopes used fancy CRTs, which allows a spacial representation, much easier to maintain an image despite distortion. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: Jan Panteltje on 9 Apr 2010 07:58
On a sunny day (9 Apr 2010 05:21:01 -0500) it happened The Phantom <phantom(a)aol.com> wrote in <umvtr5psfat5q86olg7eo0jibvgb1ar251(a)4ax.com>: >On Fri, 09 Apr 2010 09:50:37 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> >wrote: > >>Chicken anonymous alias the Phantom cried: >> >>>And, of course, those are not the ONLY advantages. >>>time far before the trigger event is a very great advantage. >> >>That is actually just the same as storage. >>you do not even need a trigger, just log everything for a day. >>No need even for a scope, just store it in some memory, >>All you need is a counter, some ADC, and FLASH or whatever :-) >>Because now you are talking about times > milliseconds. >>For anything shorter, as Tim pointed out, use a reel of coax :-) >>But get of the heroine habit first to be able to pay for it :-) > >You're scrambling to recover now. What model analog scope which you used when >you were growing up was capable of storing many megabytes of data sampled at >even as low as 4 gigasamples/second? In the early days there were no scopes. We counted the samples by hand, and carved the values in rock. Much longer preserved and better data integrity than FLASH. hehe You are changing subject, read what I wrote, and if you cannot live with that,m you are free to opt out, |