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'[EE]: Portable Scope'
2002\11\07@153454 by Josh Koffman

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Ok, I put this under EE because I wanted the opinions of how it will
perform. I may be in the position shortly to specify a portable
osciloscope for my use. It must be portable, so I am looking at the
units offered by Fluke and Tektronix. I'm not really including the
TDS200 etc. series by Tek. I know these units have LCD screens, so they
won't be the same as a real CRO. I'm looking for a scope to help with my
PIC work. I hope to be moving to the 40MHz 18f chips soon, so that
should give you an idea of the speeds I am working with. What do people
think of the Fluke 123? I know it only has 20MHz bandwidth, but I liked
the extended voltage ratings. Failing that, how about the Scopemeter 192
or 196? A page with a comparison of them all is at:
www.fluke.com/SCOPEMETER/SELECTION_TABLE.ASP?NEWTARGET=FALSE?AGID=6&SID=14
I guess my basic question is, which unit would be the best for digital
troubleshooting, letting me view waveforms and communications and the
like.

Thanks,

Josh
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2002\11\07@163728 by Dipperstein, Michael

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> From: Josh Koffman [.....listsjoshKILLspamspam@spam@3MTMP.COM]
> Sent: Thursday, November 07, 2002 2:01 PM

...

> the extended voltage ratings. Failing that, how about the
> Scopemeter 192
> or 196? A page with a comparison of them all is at:
> www.fluke.com/SCOPEMETER/SELECTION_TABLE.ASP?NEWTARGET=
FALSE?AGID=6&SID=14
> I guess my basic question is, which unit would be the best for digital
> troubleshooting, letting me view waveforms and communications and the
> like.

I've been using a Scopemeter 199 for what must be over two years.  It's a
perfect fit for the work I do, but might be overkill for the work you're trying
to do.

I write software for portable telephone test equipment, and I find that I have
to spend a lot of time simultaneously looking at differential telephone signals
and PIC I/O.  Since both probes and the power source all have isolated grounds,
I can see the events I'm looking for.

Sometimes I have do trials or investigations in the field, and I've also found
that customers become more confident when I pull the meter out to get a look at
line conditions.  That's probably not a good reason to buy the scope, but it's a
plus.

On the downside, The scope probes are designed for outdoor use, and are a bit
bulky.  One of the probe attachments broke under the weight of the probe.  I had
another probe that developed an open in the cable that connects the probe to the
scope.  If you're working indoors, you can always use a standard probe.

Another gripe of mine is the lack of resolution in recorder mode.  A little more
memory probably wouldn't have added that much more cost.

-Mike

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2002\11\07@224547 by Dwayne Reid

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At 04:01 PM 11/7/02 -0600, Josh Koffman wrote:
>Ok, I put this under EE because I wanted the opinions of how it will
>perform. I may be in the position shortly to specify a portable
>osciloscope for my use. It must be portable, so I am looking at the
>units offered by Fluke and Tektronix. I'm not really including the
>TDS200 etc. series by Tek. I know these units have LCD screens, so they
>won't be the same as a real CRO.

I've been using a Tek THS-720P for about 4 years now.  Its a great little
scope for almost anything digital but is not my first choice for analog
work (Tek 465 for that).

Upsides: great trigger capability, isolated input channels, extremely
useful measurements built-in.

Downsides: noisy input stages, short (2500 point) memory.

I evaluated several of the Fluke Scopemeters (95, 97, 99) before purchasing
the Tek - my observations at the time  were that they had absolutely the
worst trigger performance of any scope that I had used up to that period in
time.  I know they have improved since then but I haven't used the newer
ones enough to comment.  But the old Fluke 95 that I occasionally have to
use is horrid.

My take at the time was that Fluke made the best meters in the world, Tek
made the best scopes.  I still hold that opinion.

dwayne

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