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PICList Thread
'[OT]: CRO'
2001\02\28@191123 by Tony Nixon

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Hi all,

Has anyone used the handheld storage CRO from Fluke, or the semi(?)
portable one from Tectronix?

If so, any good or bad points.

Any better ones around for a similar price?

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Tony

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2001\02\28@213306 by Bob Ammerman

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I used a Fluke version a couple of years ago while on-site at a customer. It
got the job done, but at least that one is not a replacement for a 'real'
scope.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

{Original Message removed}

2001\02\28@230614 by Bob Blick

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>Has anyone used the handheld storage CRO from Fluke, or the semi(?)
>portable one from Tectronix?

I have Fluke multimeters and Tektronix scopes. I've tried it the other way
around, and wouldn't recommended it.

The THS720 is a Tek handheld scope I have owned for about 4 or 5 years. It
is very portable. I've taped it to my thigh while riding a recumbent
electric-assist trike.

It has two scope inputs and one meter input. You can use them
simultaneously. They are all electrically isolated from one another, also
isolated from the AC adapter input and the RS232 port. NO COMMON GROUNDS,
it's fantastic. You can attach one probe's ground to the hot side of the AC
line, the other probe's ground to the neutral, while taking a resistance
measurement of your tongue and logging to your PC(software available on my
website).

Battery life and charging is the biggest complaint I have. They've fixed
that in the current "A" series. Mine you charge 20 hours and get 2 hours of
run time. I built a quick charger(schematic and code available on request,
uses a 16C71).

It has not broken, screen is good, works just like the day I got it. It is
"water resistant" too.

Cheers,

Bob Blick

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'[OT]: CRO'
2001\03\01@004834 by Dan Goddard
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I used a handheld scope from Fluke before (3 years ago?), it had nice
features like using the DMM function and still being able to see the
waveform. The only bad point that I remember is that it seemed the A/B
scope channels must have been multiplexed into the DAC because it showed a
slight timing delay between the channels which in fact did not exhist. It's
apparent when you have both channels hooked to the same clock line, but how
often does that happen? It can really mess with your head when
troubleshooting. I don't  remember the model number, but it was a $3k+
model and since it's the only one I ever used, I guess it could have been a
"Fluke" (pun intended) :P

At 11:11 AM 3/1/01 +1100, you wrote:
{Quote hidden}

-------------------------------------------
Danny Goddard
Design Engineer
ARMA Design
Tel:(858) 549-2531
Fax:(858) 549-2594
Email: dan_goddardspamKILLspamarmanet.com
Web: http://www.armanet.com



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2001\03\01@042912 by Alan B. Pearce

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>Has anyone used the handheld storage CRO from Fluke, or the semi(?)
>portable one from Tectronix?

One of my colleagues has a TEK TDS220 which I have had a little play with. It is
a real nice device, highly portable, but I do not think it is battery operated.
It is a true dual channel 100MHz unit. There is also a 4 channel unit (TDS224).
I am in the throws of getting a TDS3034 which is a little larger, but still very
portable. the 3000 series come as 100, 300 or 500MHz and 2 or 4 channel.

I do not know just how portable (as in battery operated) you require, but the
TDS220 series is real nice.

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2001\03\01@095611 by severson

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I have a TDS220 and it is a very nice digital scope for a lower price than
most digital scopes. It is line-powered, not battery powered.

-Robert Severson
http://www.usbmicro.com
http://usbsimm.home.att.net
http://www.jged.com
http://www.annatechnology.com

> One of my colleagues has a TEK TDS220 which I have had a
> little play with. It is
> a real nice device, highly portable, but I do not think it is
> battery operated.

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2001\03\01@120449 by M. D. Miller

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> One of my colleagues has a TEK TDS220 which I have had a little play with.
It is
> a real nice device, highly portable, but I do not think it is battery
operated.

Yes ... I have one, and they are very nice, but not battery powered.

-- Mitch

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2001\03\01@120852 by Dipperstein, Michael

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I currently use a Fluke 199 Scopemeter.  I think they've been out for two years
now.  I wouldn't recommend it for precision work, but it's perfect for my job.
I develop software for telephone test equipment.  And I do most of my work at my
cubicle desk.  The Scopemeter sits between my ICE2000 and my line simulation
equipment.

I often have to look at differential signals across tip and ring of a telephone
line and verify that I have 3.3V logic on a PIC the responding to those signals.
The scope has two ground isolated channels, and a ground isolated power supply.
Which is just what the doctor ordered.

Periodically, I have to go out into the field, and the Scopemeter has been a
lifesaver on a few occasions.  It's allowed me to determine if the strange
behavior that we were seeing was because of a bad phone line, or due to a bad
test set.  Just for the record, it's always been a bad phone line.

-Mike

{Original Message removed}

2001\03\02@185559 by Dwayne Reid

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At 11:11 AM 3/1/01 +1100, Tony Nixon wrote:
>Hi all,
>
>Has anyone used the handheld storage CRO from Fluke, or the semi(?)
>portable one from Tectronix?

I have used both and currently own the Tek THS720P.

I did not like any of the Fluke scopes that I tried - the 95, 99, 123.  On
the 9x series scopes, the trigger was almost useless and they aliased
horribly on slow signals (under sampled).

A few months ago, a buddy asked me what I thought of the 199 which he had
been demoing for the previous couple of weeks.  He brought it over and I
was able to show him that most of the problems that I saw on the early
models were still there.  I then loaned him my Tek.

Bottom line - he bought 3 - THS730A for his company.

Don't get me wrong - I don't think that the THS7xx is perfect.  In fact, I
don't use it much for analog stuff at all - I use my Tek 465.  The handheld
720 is just too slow and noisy - I never can tell if the noise I am seeing
on the signal is really there or not.  But it is now the first instrument I
reach for if I am troubleshooting digital stuff or power electronics (both
analog and digital).  I now consider the isolated grounds essential if I am
working with industrial voltages.

If you are looking to purchase one of these beasties, get the suppliers to
send out demo units for a couple of weeks.  You should be able to decide
which one works best for your purposes.

dwayne



Dwayne Reid   <KILLspamdwaynerKILLspamspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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