Zajimava zavada osciloskopu Hantek DSO5062B

[Andrej Jancura]

Ja som myslel, ze tie bitcoiny su v reale fiktivne zlate mince... :)))

A.

2013/4/22 Kručinský Ladislav <ladislav.krucinsky na linde-mh.cz>

> Díky za vysvětlení, takže digitalizaci fosforu jsme zvládli, teď třeba
> zlato... ;-)
>
> Zdravím
> Kručinský
>
>
> -----Original Message-----
> From: hw-list-bounces na list.hw.cz [mailto:hw-list-bounces na list.hw.cz] On
> Behalf Of Pavel Troller
> Sent: Monday, April 22, 2013 8:44 AM
> To: HW-news
> Subject: Re: Zajimava zavada osciloskopu Hantek DSO5062B
>
> Zdravím,
>   myslím, že to je z toho popisu jasné.
>   DPO používá 2 procesy - zřejmě čistě hardwarový zápis do paměti
> ("Phosphor
> database") zřejmě pomocí DMA, a zobrazování této informace na běžném
> displeji.
> Každému pixelu displeje odpovídá jedna buňka té phosphor database, což ale
> není prostý bit, ale nějaké obecné číslo. Zápis není jen 0/1, ale sumuje se
> k hodnoté již uložené. V popisu to není, ale zřejmě tam bude třetí proces,
> který bude pravidelně odečítat ze všech buněk konstantní hodnotu, takže
> nepříliš často občerstvované pixely budou slábnout, až zmizí. Tím je
> programově docela pěkně simulovaná dlouhodosvitová obrazovka klasického
> osciloskopu.
>   Zdraví Pavel
>
> > Ak som to spravne pochopil tak je to odlisny sposob spracovania. Nikdy
> > som nad tym nerozmyslal tak som si musel zobrat na pomoc wikipediu :-)
> > Uplne obycajny digitalny osciloskop len sprosto navzorkuje signal a
> > zobrazi ho. Navzorkuje dalsi a zobrazi.
> >
> > U phosphor pisu ze sa pouziva akasi umela zotrvacnost v zobrazovani
> > aby si tam videl aj glitche a ine iregularity signalu. Potialto som to
> > pochopil
> > :-) Okrem toho pisu ze sa pouziva uplne iny sposob spracovania signalu
> > aby bol osciloskop rychlejsi a mal mensi dead time, toto som zatial
> nepochopil.
> > Podla vsetkeho to bola nova technologia zavedena u prvych cislicovych
> > osciloskopoch a dnes sa to pouziva uz na vsetkych slusnych masinach
> > akurat to uz nezdoraznuju.
> >
> >
> > A disadvantage of digital oscilloscopes is the limited refresh rate of
> > the screen. On an analog oscilloscope, the user can get an intuitive
> > sense of the trigger rate simply by looking at the steadiness of the
> > CRT trace. For a digital oscilloscope, the screen looks exactly the
> > same for any signal rate which exceeds the screen's refresh rate.
> > Additionally, it is sometimes hard to spot "glitches" or other rare
> > phenomena on the black-and-white screens of standard digital
> > oscilloscopes; the slight persistence of CRT phosphors on analog
> > oscilloscopes makes glitches visible even if many subsequent triggers
> > overwrite them. Both of these difficulties have been overcome recently
> > by "digital phosphor oscilloscopes," which store data at a very high
> > refresh rate and display it with variable intensity, to simulate the
> trace persistence of a CRT oscilloscope.
> >
> > Digital phosphor oscilloscopes
> > Digital phosphor oscilloscopes (DPOs) were introduced by Tektronix in
> > the late 1990s. DPOs employ a parallel processing architecture rather
> > than the serial processing architecture of other types of digital
> oscilloscopes.
> > This allows DPOs to capture transient events while maintaining a large
> > bandwidth. With the use of parallel processing, the display permits
> > intensity information to be seen in real time.
> > The first stage of the parallel-processing unit is a vertical
> > amplifier, like that of digital storage oscilloscopes. The second
> > stage continues to mimic that of a DSO: the signal is sent to an ADC.
> > After the ADC, however, the processing architecture varies. A DSO
> > captures waveforms in a serial manner. This generates a "holdoff"
> > time, in which the oscilloscope can not record any activity. The speed
> > of the microprocessor thereby limits the rate at which waveforms can
> > be captured. A DPO rasterizes the digital waveform into a digital
> phosphor database, which is continually updated.
> > Then, about every 1/30th of a second, an image of the signal is sent
> > to the display. By directly rasterizing the data and copying it to
> > display memory from the digital phosphor database, the rate
> > determining step is no longer the speed of the microprocessor.
> > The "phosphor" of the DPO is purely electronic. The digital phosphor
> > database is composed of many cells which correspond to single pixels
> > within the display. Each time a cell is touched by the waveform,
> > intensity information accumulates. The DPO can display the information
> > in terms of contrasting colors.[5][6]
> >
> >
> > On Apr/22/2013 8:00, Kručinský Ladislav wrote:
> >> Ahoj, Balu,
> >> zaujal mě ten název: Digital Phosphor Oscilloscope...
> >> To je k čemu dobré to slůvko "Phosphor" ?
> >>
> >> Zdravím
> >> Kručinský
> >>
> >>
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