piclist 2001\01\08\125242a >
Thread: PC Digitizing Storage Oscilliscope
www.piclist.com/techref/index.htm?key=digitizing+storage
flavicon
face BY : Dan Michaels email (remove spam text)



Jinx wrote:
>> Does anybody have any recommendations for a PC Digitizing
>> Storage Oscilliscope, or just a regualr DSO.
>
>I've had my eye on the Electronics Australia Oct 1998 DSO. It
>has dual channel 20MSPS @ 8 bits, PC controlled timebase,
>vertical attenuation and vertical waveform position controls. It
>looks as though it could be built quite cheaply. Let me know if
>you want a schematic
>

Thank you for the schematic, sir. I was most interested in the
design of the analog front-end. This is always "the" major
difficulty with this kind of project.

The input amps can only accept Vin to +/-12v in direct mode, and
the protection for overvoltage [470ohm series R + diodes clamping
to +/-12v] is barely marginal. If you OV with 50v, you severely
load down the signal, and can drive large currents into limiter
resistors R20/R27 --> (50-12)/470 = 80mA --> 3W dissipation.
There goes your 1 Mohm input resistance down the hollow pipe.

thanks,
- Dan Michaels
Oricom Technologies
http://www.oricomtech.com
=========================

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


<1.5.4.16.20010108101453.2ee70b88@pop.dnvr.uswest.net>

See also: www.piclist.com/techref/index.htm?key=digitizing+storage
Reply You must be a member of the piclist mailing list (not only a www.piclist.com member) to post to the piclist. This form requires JavaScript and a browser/email client that can handle form mailto: posts.
Subject (change) PC Digitizing Storage Oscilliscope

month overview.

new search...