any comments of digital oscilloscopes compare to benchtop ones?

jarthel · 4th December 2006, 11:51 PM

as title.

Also how is the quality of the software included? would it work with xp?

I'm looking at the 100Mhz version. something like this:
http://cgi.ebay.com.au/100M-2CH-PC-B...QQcmdZViewItem

I'm also confused that they advertised the scope as 100Mmhz but bandwidth is only 30Mhz. misinformation perhaps?

Thanks for the replies

jcx · 5th December 2006, 02:38 AM

100 Mhz is the sampling rate, with perfect anti-alias filters and reconstruction filters Nyquist theory would say you could measure up to 50Mhz

with practical limitations you wouldn't want to rely of even their 30 MHz spec, 5-10 Mhz would be more fair comparison to a pure analog socpe bandwidth

For the price you should be able to get a analog 50-60 MHz scope used

which is not to say that this product doesn't have a place and can do some tricks that a analog scope couldn't dream of

FastEddy · 5th December 2006, 02:44 AM

The basic limitation on all of these "cheap" USB connected 'scopes is the USB interface. Barely able to pass multichannel 16 bit CD audio, USB is not the engineers' choice. The 30 mbps "real" performance is quite good enough for multiple audio channels, however. There are new USB connected single channel 'scopes to 30 mbps for less than US$150 ... check out EETimes Magazine in the back pages.

4th December 2006, 11:51 PM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	any comments of digital oscilloscopes compare to benchtop ones? as title. Also how is the quality of the software included? would it work with xp? I'm looking at the 100Mhz version. something like this: http://cgi.ebay.com.au/100M-2CH-PC-B...QQcmdZViewItem I'm also confused that they advertised the scope as 100Mmhz but bandwidth is only 30Mhz. misinformation perhaps? Thanks for the replies

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5th December 2006, 02:38 AM	#2
jcx diyAudio Member Join Date: Feb 2003 Location: ..	100 Mhz is the sampling rate, with perfect anti-alias filters and reconstruction filters Nyquist theory would say you could measure up to 50Mhz with practical limitations you wouldn't want to rely of even their 30 MHz spec, 5-10 Mhz would be more fair comparison to a pure analog socpe bandwidth For the price you should be able to get a analog 50-60 MHz scope used which is not to say that this product doesn't have a place and can do some tricks that a analog scope couldn't dream of

5th December 2006, 02:44 AM	#3
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	The basic limitation on all of these "cheap" USB connected 'scopes is the USB interface. Barely able to pass multichannel 16 bit CD audio, USB is not the engineers' choice. The 30 mbps "real" performance is quite good enough for multiple audio channels, however. There are new USB connected single channel 'scopes to 30 mbps for less than US$150 ... check out EETimes Magazine in the back pages.