On Saturday, January 22, 2011 10:39:48 pm Edward Bernard did opine:
> I'm currently working on a stand-alone stepper controller based on an
> Arduino. As I get further into this I'm feeling the need for an
> oscilloscope so I can actually see if my code is giving me the results
> I want. Not having one at my disposal I got to thinking that I could
> use Halscope somehow. Is this possible? Any ideas of how to accomplish
> it?
>
> Greg
>
>
Someone may call me out, but I believe halscope doesn't have any inputs
from the outside world.
I would tend to go shopping for a decent, at least dual trace, 100mhz scope
and some decent 10x probes, (check MPJones for decent, reasonably priced
probes) mainly because the chopper waveforms present in a modern drive need
at least that amount of bandwidth in order to be able to reproduce what is
going on, allowing one to study dead times and such. These circuits often
have sub 10 nanosecond rise and fall times & that means 100 mhz. Or more.
I currently have had a Hitachi 1065 for about 15 years now, and its held up
well, paid about $1200 for it used way back when. Some computerized
measurement modes are available with this one but not the full monty, just
what you commonly need. Worth every penny, its bandwidth rolls off above
100 mhz slow enough that I can use it for troubleshooting in a 180mhz
circuit as long as I recognized when I have put the amplifiers into a slew
rate limited state. For a newbie at using a scope, that may not be so
obvious, but I have had a scope probe in one hand for 60 years. Heck, I
can't do much more than check a flashlight battery without reaching for the
scope probe to really see whats going on.
There are whole catalogs of slower scopes whose prices look attractive, but
a bandwidth of only 20 mhz will lie like a rug about these circuits because
they are so slow. Hitachi, except for the v-1085, which has triggering
problems, makes a good, long lasting scope at a great price considering the
specs you get for your dollar.
Steer clear of older tektronix scopes (2235/545's etc) as their custom made
input attenuators go out of calibration in ways the scope probes capacitor
adjustments cannot cope with. And they are not repairable as those parts
aren't available after 5 years, about the same time it needs fresh ones.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Only fools are quoted.
-- Anonymous
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