The Ossie motor

[woopy]

@Jb

to complete the Gyula explanation here a drawing

@ Cp

and a picture of my scope  25 mghz

good luck

laurent

[gyulasun]

Hi Folks,

Here is a digital scope, 25MB bandwidth:
http://cgi.ebay.com/ATTEN-ADS1022-C-25MHz-Digital-Oscilloscope-DSO-ADS1022C_W0QQitemZ250548408860QQcmdZViewItemQQptZBI_Oscilloscopes?hash=item3a55d9521c

Unfortunately, the shipping costs $102 from Hong Kong, maybe the manufacturer has got dealers on the main continents: http://www.atten.com.cn/english/index.html

rgds, Gyula

[captainpecan]

Hi.

This scope should be more than good enough:
http://cgi.ebay.com/Hantek-DSO-2090-PC-USB-Digital-Oscilloscope-100MS_W0QQitemZ280422059620QQcmdZViewItemQQptZBI_Oscilloscopes?hash=item414a750e64

This one has 40MHz bandwidth. And I have read some good reviews online about Hantek DSO-2090.
I think that gotoluc also has it.

I am using much cheaper one with bandwidth only 12Mhz and is still more than enough for basic researching.

Frenky

Thanks for the recommendation. For some reason a while back someone told me not to get a usb scope because they could not due DC.  This one shows "DC accuracy +-3%", I assume this means they told me wrong, and they just did not have as good of quality of one to compare to?  Or does that spec mean something else entirely?  Because I certainly want to be able to measure DC.

[futuristic]

Yeah you can measure DC no doubt about that.

[gyulasun]

Hi CP,

Once the scope is featured for Coupling modes as AC/DC/GND it should mean the DC coupling too. Otherwise it would be a big drawback in marketing for this type.  The +-3% DC accuracy is a usual accuracy for even a similar digital scope like the one I referred to or probably Laurent has.
The only problem I have with USB PC scopes is they need a PC...  they are designed to a PC of course,  maybe a dedicated lap-top could be assigned for it.

rgds, Gyula