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PICList Thread
'[OT] HP or other Scope Recommendation'
1999\04\25@182411 by David Olson

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OK, getting ready to spring for a scope but, there's a lot out there (DMM's
real hard to see waveforms). I'd like to be able to scope my PIC projects,
so I don't think I need to get too elaborate. If you've got some data on HP
equipment, that would be great - my wife works there and she can get
refurbished equipment at a reasonable cost. If not HP, what should I be
looking for...

-DO

1999\04\25@190839 by Wagner Lipnharski

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David Olson wrote:
>
> OK, getting ready to spring for a scope but, there's a lot out there (DMM's
> real hard to see waveforms). I'd like to be able to scope my PIC projects,
> so I don't think I need to get too elaborate. If you've got some data on HP
> equipment, that would be great - my wife works there and she can get
> refurbished equipment at a reasonable cost. If not HP, what should I be
> looking for...

For microprocessors and digital actual speeds, a 100MHz scope (10ns
resolution) is almost not enough, then the solution here is just browse
pricing for a minimum of 100MHz, two channels, external sync
triggering.  Screen digital information about panel setup even being
nice is not totally necessary.

Don't forget that you have the Tektronix scope choices in the used
market, a 2235 model (100MHz) can be found for less than $400.  Send me
an email if you want me to sniff around.

--------------------------------------------------------
Wagner Lipnharski - UST Research Inc. - Orlando, Florida
Forum and microcontroller web site:  http://www.ustr.net
Microcontrollers Survey:  http://www.ustr.net/tellme.htm

1999\04\25@200050 by Bob Drzyzgula

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My personal preference is for Tek scopes, and I know this
preferance to be shared among several acquaintenances
of mine. But then, I haven't had much experience with HP
scopes, so it probably isn't fair to conclude that much
from this. I will say that we have one HP scope in my
office, one of their mixed signal line (combination logic
analyser and DSO) and, when sat next to a similarly-priced
Tek scope, one of the most obvious differences is in
screen size -- it is pretty rough watching 10 channels
of logic and a waveform on that tiny screen; I kind of
concluded that they expected the predominant use to be
with an HP-IB station.  In addition to the larger screen
to start with, the Tek TDS620 that I have at work has
a VGA output on the back so that you can have it output
direct to a nice, big computer monitor. I also found the
Tek setup to be more intuitive, but again, I've almost
always used Tek so that this isn't a fair comparison. The
Tek TDS2xx series of scopes have some remarkable pricing,
although you do have to deal with an LCD display that
will be less responsive than a phosphor screen. Still,
they are small and lightweight, and you can get a brand
new 60MHz digital scope for in the range of $1,000. (You
didn't say what your price range was...)

There are a number of good used test equipment sellers
out there. One that I can recommend without hesitation is
Test Equity ( http://www.testequity.com ). I have bought
a few used devices from them and all I can say is that the
stuff they sent was generally better than what I expected.
I bought a used Tek TDS340 from them and was surprised
that it came with a fresh NIST-traceable calibration even
though they hadn't even claimed that it would. Generally
it will take them longer to ship used equipment than new
because they don't calibrate it until just before they
ship it. Most of the new test equipment I've bought at
my office has come from them as well.

Other reputable used sources include Tucker Electronics
( http://www.tucker.com ) and ValueTronics
( http://www.valuetronics.com/ ). Browsing around some
of these sites will probably give you a good idea of how
the pricing your wife can get compares with real-world
market value.

--Bob

On Sun, Apr 25, 1999 at 06:22:38PM -0400, David Olson wrote:
> OK, getting ready to spring for a scope but, there's a lot out there (DMM's
> real hard to see waveforms). I'd like to be able to scope my PIC projects,
> so I don't think I need to get too elaborate. If you've got some data on HP
> equipment, that would be great - my wife works there and she can get
> refurbished equipment at a reasonable cost. If not HP, what should I be
> looking for...
>
> -DO

--
============================================================
Bob Drzyzgula                             It's not a problem
spam_OUTbobTakeThisOuTspamdrzyzgula.org                until something bad happens
============================================================

1999\04\25@201912 by Jim Paul

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David,

I too have been looking for a scope for the same purpose.  Do you think she
would get me one too?
I would appreciate it very much if she could.    What I have in mind is
something like the Fluke Scopemeter.  I believe HP makes one like this too.
Let me know what you think.


Thanks and Regards,


Jim
{Original Message removed}

1999\04\25@215455 by Eric Oliver

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Has anyone had any experience with BitScope ?  This is a PC based Scope
that I believe goes to 100mhz.  It's been awhile since I checked their
site. They are working on a Win95 interface and the price is right. It's
open source technology, I believe it uses a PIC too.

I need a scope and am on a hobbyist budget so it looked like a good
alternative. My only reservation is whether it would work well enough
(having zero experience in this area). I would be interested in hearing
what the PICLIST has to say about it.

You can check it out at http://www.bitscope.com


Eric

{Original Message removed}

1999\04\25@220227 by Sean Breheny

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Hi Eric,

One thing you need to watch out for is what is the single-shot sampling
rate? One of the great strengths of DSOs is that they can capture fast
events which happen infrequently. I think that BitScope (and many low-end
DSOs) can only handle 20MHz or so single-shot events and only acheive their
stated bandwidth when the input is completely periodic. It is
true,however,that analog scopes pretty much act this way,too,since they
need a periodic signal to make the phosphor glow brightly enough to see
very well.

Sean

At 07:51 PM 4/25/99 -0500, you wrote:
{Quote hidden}

| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
\--------------=----------------
Save lives, please look at http://www.all.org
Personal page: http://www.people.cornell.edu/pages/shb7
.....shb7KILLspamspam@spam@cornell.edu ICQ #: 3329174

1999\04\25@221441 by Alan Vogel

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This may sound simplistic, but (in a nutshell) I preferTektronix for time
domain test instruments and HP for frequency domain test instruments.

Alan

1999\04\25@230443 by Sean Breheny

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I have never owned an HP scope, but I want to put a good word in for used
Tek scopes. I have a Tek 7704A, a 250MHz lab-type (read BIG) scope from
around 1980 which I got for about $350. It works very well,and often amazes
me with what it will display. I do have to give one word of caution, and
that is that you have to make sure that you are dealing with someone with a
good reputation. I had to end up sending my first one back because it
developed a problem after about 5 days. Then a tantalum cap went in the
replacement. I was able to fix that,though,and didn't need to send it back.

Sean

At 07:14 PM 4/25/99 -0700, you wrote:
>This may sound simplistic, but (in a nutshell) I preferTektronix for time
>domain test instruments and HP for frequency domain test instruments.
>
>Alan
>
|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
\--------------=----------------
Save lives, please look at http://www.all.org
Personal page: http://www.people.cornell.edu/pages/shb7
shb7spamKILLspamcornell.edu ICQ #: 3329174

1999\04\25@234650 by Dave VanHorn

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> I have never owned an HP scope, but I want to put a good word in for used
> Tek scopes. I have a Tek 7704A, a 250MHz lab-type (read BIG) scope from
> around 1980 which I got for about $350. It works very well,and often
amazes
> me with what it will display. I do have to give one word of caution, and
> that is that you have to make sure that you are dealing with someone with
a
> good reputation. I had to end up sending my first one back because it
> developed a problem after about 5 days. Then a tantalum cap went in the
> replacement. I was able to fix that,though,and didn't need to send it
back.


The Tek 7000 line is excellent.
It's older, but it has an excellent assortment of plug-ins.
I use mine with their 7L5 and 7L12 spectrum analyzers.

My other scopes are Tek too..

TDS420, with huge digital memory, lets me email waveforms, and the VGA out
couples to a monitor, or my overhead projector panel.

I also have a cute battery powered handheld 2 channel storage scope, Tek
214.
Not a lot of bandwidth, but very handy in the field.

I ALMOST went for an HP logic dart, but only having three channels was just
too limiting.  I got a Tek 318 instead.

1999\04\26@001547 by Wagner Lipnharski

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> The Tek 7000 line is excellent.
> It's older, but it has an excellent assortment of plug-ins.
> I use mine with their 7L5 and 7L12 spectrum analyzers.
>
> My other scopes are Tek too..

as somebody said before, all my scope knowledge is from Tek, (IBM uses
Tek scopes), while Fluke and HP meters, so as the electron beam I am
also strongly polarized by Tek scopes. :)
Wagner

1999\04\26@012651 by Gerhard Fiedler

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At 20:00 04/25/99 -0400, Bob Drzyzgula wrote:
>Tek TDS2xx series of scopes have some remarkable pricing,
>although you do have to deal with an LCD display that
>will be less responsive than a phosphor screen. Still,
>they are small and lightweight, and you can get a brand
>new 60MHz digital scope for in the range of $1,000.

i got one of these, and i like it pretty much. if i had double the amount
to spend, i would get one of the portable teks which have two potentially
separated inputs, but for the time being this fits the bill... :)  and i
don't have any problems with the lcd screen -- the display has enough
options to make it possible to see everything i want to see. (well,
sometimes it's not what i =want= to see, but i see it anyway :)

ge

1999\04\26@032344 by William Chops Westfield

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I bought a Tek TDS210 (sort of high-end hobbyist line, I guess.)  It's
significantly smaller and lighter than normal scopes (LCD screen, 5 inches
deep), so It takes up a lot less space (zero, when you're not using it, since
it will fit in storage places when a "real" scope wouldn't.

Can't say that I've used it enough to get a good idea of likes and dislikes
at this point.  It's only a 60MHz scope (although there's a 100MHz variant.)

BillW

1999\04\26@051336 by Jochen Feldhaar

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Hello all,

unfortunately TEK have given up all their CRT scope models, almost the same
as HP. If you want a good analog or analog/digital scope, go for a HAMEG
1505 or 1507. Or if you want digital alone, try the new 1008, coming
soon(maybe called 2008 then).
I know, I helped build some of these scopes at Hameg...

Jochen Feldhaar DH6FAZ
.....jfKILLspamspam.....detektor.de

1999\04\26@075904 by Pavel Korensky

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Hello,

At 18:22 25.4.1999 -0400, you wrote:
>OK, getting ready to spring for a scope but, there's a lot out there (DMM's
>real hard to see waveforms). I'd like to be able to scope my PIC projects,
>so I don't think I need to get too elaborate. If you've got some data on HP
>equipment, that would be great - my wife works there and she can get
>refurbished equipment at a reasonable cost. If not HP, what should I be
>looking for...
>
>-DO
>

I do not know, if you are trying to DSO or normal scope. But, more than one
year ago, I also asked similar question here in this forum. I needed to
replace my old Tek (with analog storage screen).
I compared several DSOs (HP, Fluke, Tektronix) and finally, I bought the HP
54645A dual channel 100 Mhz DSO with so called MegaZoom memory, with
measurement module option. I must say that I am totally happy with this
model. Price was not so bad and the big memory (MegaZoom) is unbelievably
usefull for debugging serial buses etc. Also the possibility to measure
various voltage and timing parameters (including FFT) is very usefull.
Price was around 4.000 USD, new unit. Recently, I saw somewhere on the web
this unit as a second hand instrument for approx. 1000 USD.

Best regards

PavelK
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