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good theory of operation

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what is useful about this theory of operation:
first, it has the block diagram
second, it has succinct explanations of what voltages / signals to expect
third, it is simple enough to grasp quickly
more indepth explanations could be saved for a later block diagram.
taken from thermal arc 201ts welder.

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i owned a ds1054z and it took me years to learn:
i owned a ds1054z and it took me years to learn that:
the scope is slow when using the knobs, however
it is really powerful (although i have not tested personally)
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as another option the analog discovery might do some of the above as well.
no idea which is better / easier. would have to use both and do a review.
with the usb type logic analyzer scopes you have something you can
stick with a beagleboard on a customers site and do some potentially
easy but still powerful logging. basically you get the software and the
dacs of the usb boxes with the linux of the sbc.

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