Jim Douglas wrote:

Anyone use these? Any recommendations good or bad? I am looking at some that
have Scope, Meter, Spectrum Analysis, etc. Are the "multi-use" type PC
scopes any good? I see some that are down around $200-300? which is in my
price range.

Thanks!


Jim Douglas
www.genesis-software.com
Carrollton, TX USA 75006
Latitude 32.9616
Longitude 96.8916




They are too limited to be worth the money.
Get a used Tek in good working order in that
price range, as another poster mentioned.

Ed

In article GIjId.17102$Qb.16595@edtnps89, says...

Dr. Anton T. Squeegee wrote:

If you want some serious bandwidth, you should have a look at the
Tek 7904 or 7104. The base frames have bandwidths of 500MHz and 1GHz,
respectively, and you should be able to get a good 7904 with plug-ins
for a little over $300.


There's one major advantage to the PC based scopes. It's STORAGE of
waveform. When I was younger we had to put a hood over the front of the
scope and use a Polaroid to get shots of easy to miss signals.

Tektronix DSA602A Digital Signal Analyzer. All kinds of waveform
storage and analysis, and a floppy drive as well. Runs about $400-$500
on the used market, uses 11-series plug-ins, mainframe bandwidth of
1GHz.

A real storage oscilloscope costs a fortune, but if you can get a PC variety
that fills your frequency needs, I'd go for it. Three or four hundred bucks
is a bargain when accompanied by a good warranty..

And how long will it last? If it's made up entirely of custom
parts, and cannot be repaired by the end user (at least at the module
level), then I would hardly think of it as a good investment.

When I buy test equipment, I expect it to be serviceable for a
MINIMUM of ten years. Very few items that I've bought new have measured
up to that requirement.


--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
(Known to some as Bruce Lane, ARS KC7GR,
kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
"If Salvador Dali had owned a computer, would it have been equipped
with surreal ports?"


----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups
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Dr. Anton T. Squeegee wrote:
In article GIjId.17102$Qb.16595@edtnps89, says...


Dr. Anton T. Squeegee wrote:


If you want some serious bandwidth, you should have a look at the
Tek 7904 or 7104. The base frames have bandwidths of 500MHz and 1GHz,
respectively, and you should be able to get a good 7904 with plug-ins
for a little over $300.


There's one major advantage to the PC based scopes. It's STORAGE of
waveform. When I was younger we had to put a hood over the front of the
scope and use a Polaroid to get shots of easy to miss signals.


Tektronix DSA602A Digital Signal Analyzer. All kinds of waveform
storage and analysis, and a floppy drive as well. Runs about $400-$500
on the used market, uses 11-series plug-ins, mainframe bandwidth of
1GHz.


A real storage oscilloscope costs a fortune, but if you can get a PC variety
that fills your frequency needs, I'd go for it. Three or four hundred bucks
is a bargain when accompanied by a good warranty..


And how long will it last? If it's made up entirely of custom
parts, and cannot be repaired by the end user (at least at the module
level), then I would hardly think of it as a good investment.

When I buy test equipment, I expect it to be serviceable for a
MINIMUM of ten years. Very few items that I've bought new have measured
up to that requirement.





You make some valid points, but I still have concerns. Tektronix, among many
others, has been known to use proprietary chips/components in their scopes.
These may be getting hard to get. That would tend to even out the decision
making process, all other things being equal.


Having said that, Tektronix stuff is very nice, quality made merchandise.
I'm admiring a 7B92A dual time base module even as we speak. I just don't
want to wind up like Hamlet...

Alas, poor 7904, I knew it Horatio...






mike

I'd rather have a stand alone scope myself. I don't know how good a
scope you need, but you can find them real cheap if you look around.
IE: hamfests, etc..I have 3 scopes, but the one I use mostly now is a
Kikusui COS 5060. I bought it for $50...It's a 60 mhz scope..It's
no top line scope, but it's quite usable for most of my needs.
I also have an old heathkit scope, which still works, and also an
ancient 60's tube hickock, which was built by tektronics...Has the
plug in tektronics preamps, etc...
But the old tek scope blew a gasket the last time I plugged it in.
I consider it tit's up...The kikusui is pretty modern compared to the
other two... MK

Thanks for all the input, I am going to pass on the PC stuff and shop EBay
and ?? for a good used scope. Any recommendations other than EBay?


"Jim Douglas" wrote in message
...
Anyone use these? Any recommendations good or bad? I am looking at some
that
have Scope, Meter, Spectrum Analysis, etc. Are the "multi-use" type PC
scopes any good? I see some that are down around $200-300? which is in my
price range.

Thanks!


Jim Douglas
www.genesis-software.com
Carrollton, TX USA 75006
Latitude 32.9616
Longitude 96.8916

On Sat, 22 Jan 2005 08:26:08 -0600, "Jim Douglas"
wrote:

Thanks for all the input, I am going to pass on the PC stuff and shop EBay
and ?? for a good used scope. Any recommendations other than EBay?

There are several places around the internet that sell reconditioned
test equipment. You might end up spending a bit more than at ebay but
you (should be) getting something that has been cleaned, op tested, and
has all of its parts. Possibly also a better warranty.

There are a jillion out there, but a couple that I get periodic catalogs
from a
http://www.testequity.com/
http://www.testequipmentconnection.com/


--
Rich Webb Norfolk, VA

In article MPG.1c5c3d153e17de829896ac@localhost,
Dr. Anton T. Squeegee wrote:

In article ,
james.douglas@genesis- software.com says...

Top-posting corrected. Please don't top-post! See this link for
the reason why: http://www.html-faq.com/etiquette/?toppost

"Jim Douglas" wrote in message
...
Anyone use these? Any recommendations good or bad? I am looking
at some
that
have Scope, Meter, Spectrum Analysis, etc. Are the "multi-use"
type PC scopes any good? I see some that are down around
$200-300? which is in my price range.

Thanks!


Jim Douglas www.genesis-software.com Carrollton, TX USA 75006
Latitude 32.9616 Longitude 96.8916

Thanks for all the input, I am going to pass on the PC stuff and
shop EBay and ?? for a good used scope. Any recommendations other
than EBay?

Sure. Check http://www.arrl.org/hamfests.html for hamfests in your
area. They happen all over the country (heck, all over the world) at
various times during the year, and the swap meet portion of any
hamfest bears (usually) a 95% or higher focus on electronics in terms
of test gear, radios, computers, etc.

If you've never been to such an event in your life, I would
(SHAMELESS PLUG ALERT) take a look at an article I wrote on my own
page at this link:
http://www.bluefeathertech.com/technoid/Scrounger.html

This is a guide to scrounging at both surplus places and swap meets.
I hope you find it helpful.

Happy hunting.

It is very rare for a cross posted article to RRS to be useful. Most are
Trolls. I enjoyed your web page on scrounging. I'm taken aback on the
prices that you posted about equipment however quoted below.

Dr. Anton T. Squeegee wrote:

If you want some serious bandwidth, you should have a look at the
Tek 7904 or 7104. The base frames have bandwidths of 500MHz and 1GHz,
respectively, and you should be able to get a good 7904 with plug-ins
for a little over $300.

A TDS7104 sold new in the $30K to $40K range depending on options. I
have priced this scope at used equipment resellers in the $8 to $10K
range. The equipment is sold in calibration and working with a short
warranty like 30 days for verification that the equipment is in proper
working condition from resellers.

At prices under $1K even with no guarantees I expect this equipment is
hot at those prices. All equipment from the major makers have serial
numbers throughout the equipment and in the firmware. If you ever send
this equipment in for repair you might be in for an unpleasant surprise.

In the last few years there is a new class of scope called real time.
The reason I'm responding to this thread is that you just happened to
mention a real time scope the TDS7104. Tek calls real time scopes DPO or
Digital Phosphor scopes. Most digital scope are repetitive sampling
making them a poor choice for low frequency events like an intermittent
pulse and these are useless for high speed single shot events. The DPO's
resemble an analog scope with memory. There are the best suited digital
type for single shot or low frequently occurring events. The DPO's are
designed for a very high re-acquisition rate compared to digital
sampling types, which is why they are better suited for the low
frequency events as they are more likely to be actually sampling the
input during an event rather than being in another part of the
processing cycle. DPO's have a rapid processing cycle and also have most
of that cycle being actual sample time so they are able to catch that
infrequent pulse. The repetitive sample high speed scopes generally have
cycle times of 200KHz or slower and most of that cycle time is signal
processing and display. Repetitive sampling scopes are good at any type
of recurring signal like clocks. They are poor choice at looking at data
streams with long patterns. The only way you can look at long patterns
is at the bit level or eye mode.

--
Telamon
Ventura, California

"Telamon" wrote in message
...
In article MPG.1c5c3d153e17de829896ac@localhost,
Dr. Anton T. Squeegee wrote:

SNIP

This is a guide to scrounging at both surplus places and swap meets.
I hope you find it helpful.

Happy hunting.

It is very rare for a cross posted article to RRS to be useful. Most are
Trolls. I enjoyed your web page on scrounging. I'm taken aback on the
prices that you posted about equipment however quoted below.

Dr. Anton T. Squeegee wrote:

If you want some serious bandwidth, you should have a look at the
Tek 7904 or 7104. The base frames have bandwidths of 500MHz and 1GHz,
respectively, and you should be able to get a good 7904 with plug-ins
for a little over $300.

A TDS7104 sold new in the $30K to $40K range depending on options. I
have priced this scope at used equipment resellers in the $8 to $10K
range. The equipment is sold in calibration and working with a short
warranty like 30 days for verification that the equipment is in proper
working condition from resellers.

At prices under $1K even with no guarantees I expect this equipment is
hot at those prices. All equipment from the major makers have serial
numbers throughout the equipment and in the firmware. If you ever send
this equipment in for repair you might be in for an unpleasant surprise.

In the last few years there is a new class of scope called real time.
The reason I'm responding to this thread is that you just happened to
mention a real time scope the TDS7104.


No, he didn't. He was describing the Tek 7000 series mainframes and
plug-ins, NOT any of the TDS series scopes. There are many years, and a
world of difference, between the two.

Ed
wb6wsn

Jim Douglas wrote:

Thanks for all the input, I am going to pass on the PC stuff and shop EBay
and ?? for a good used scope. Any recommendations other than EBay?

Do a Google search for 'used lab equipment'.

http://www.saelig.com/PR_Stingray.htm

Jim Douglas wrote:
Anyone use these? Any recommendations good or bad? I am looking at some that
have Scope, Meter, Spectrum Analysis, etc. Are the "multi-use" type PC
scopes any good? I see some that are down around $200-300? which is in my
price range.

Thanks!


Jim Douglas
www.genesis-software.com
Carrollton, TX USA 75006
Latitude 32.9616
Longitude 96.8916