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Discussion Groups | MSP430 | Re: OT: USB Oscilloscopes
The purpose of this group is to foster exchange of information on the Texas Instruments MSP430 family of microcontrollers and related tools. Everyone welcome, all levels of familiarity/expertise.
Re: OT: USB Oscilloscopes - swarf_maker - Jul 8 10:40:09 2008
--- In m...@yahoogroups.com, Joerg wrote:
>
> Just keep in mind that on a scope 250MSPS is undersampled for a
signal
> of 100MHz bandwidth unless the scope steps over to equivalent time
> sampling at 100nsec/div or so. A good scope can somewhat reconstruct
> from 4-5 times BW but most need 10 times.
>
> To measure stuff in a MSP430 design this scope should be fine.
>
My thinking was that a 100MHz bandwidth should give me a faithful
representation of logic signals up to about 20 MHz where the fifth
harmonic starts to drop off. As you say, fine for anything around an
MSP430, probably OK even for the new 25 MHz parts.
The box indicates that Hantek have two 200 MHz models with a 50 GHz
equivalent sampling rate, but I have not been able to find anyone
selling these and I expect they would be beyond my budget.
------------------------------------
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>
> Just keep in mind that on a scope 250MSPS is undersampled for a
signal
> of 100MHz bandwidth unless the scope steps over to equivalent time
> sampling at 100nsec/div or so. A good scope can somewhat reconstruct
> from 4-5 times BW but most need 10 times.
>
> To measure stuff in a MSP430 design this scope should be fine.
>
My thinking was that a 100MHz bandwidth should give me a faithful
representation of logic signals up to about 20 MHz where the fifth
harmonic starts to drop off. As you say, fine for anything around an
MSP430, probably OK even for the new 25 MHz parts.
The box indicates that Hantek have two 200 MHz models with a 50 GHz
equivalent sampling rate, but I have not been able to find anyone
selling these and I expect they would be beyond my budget.
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )