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PICList Thread
'oscilloscopes'
1997\12\13@175308 by johnb

picon face
Tom Rogers wrote:
> Come to think of it, this thread might have been the sleeper of the year in
> terms of actually imparting some of what it takes to the less experienced...
>

At least one contributor stated his intention of building a digital
scope or logic analyser that plugged into a PC printer port. Before
lifting a soldering iron, it is worth downloading the Demo software for
such scopes made available on the Net. Some of it is rather awful. If PC
add-on scopes aren't as popular as they surely should be, it might be
due to the low quality of the current products. Some claim to do so many
things, most of which you've managed without for years. Many are just
hard to understand and operate. And if the real software bombs as often
as the Demos, you wouldn't want to risk your money on it.

Look at:  ...http://www.pico.co.uk ....http://www.tiepie.nl ....linkinstruments.com
and others.

One of them is very impressive, if a bit old-fashioned. The scope
available from:
http://www.maplin.co.uk
looks like a scope, and does what you expect it to do, with familiar
controls. And the price is not unreasonable.

Another is very attractive but over-priced. It's at:
http://gs2020.open.ac.uk/products.htm

The Open University in the UK devises home study courses for all kinds
of things, from the Arts and Humanities to Technology. For the latter,
they make equipment available to students, on loan or at low prices.

The GS2020 scope is a digital sampling scope, 20 MHz, dual-channel. A
modest spec. The scope also contains 3 programmable power supplies for
powering experimental hardware, and a digitally controlled function
generator that produces sine/triangle/square waves up to several MHz.
All this is controlled from the scope front panel. The Windows display
software has a mature and elegant appearance.

Exactly what the student or hobbyist needs, in fact. But it costs over
UKP 600. The same basic scope spec is available elsewhere for half this.
I can't see how the extra hardware can cost this much. I wouldn't pay
this much for 20 MHz sampling rate.

John Blackburn,
South London UK.

1997\12\13@214056 by Andrew Warren

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flavicon
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john blackburn <spam_OUTjohnbTakeThisOuTspamdircon.co.uk> wrote:

> At least one contributor stated his intention of building a digital
> scope or logic analyser that plugged into a PC printer port. Before
> lifting a soldering iron, it is worth downloading the Demo software
> for such scopes made available on the Net. Some of it is rather
> awful. If PC add-on scopes aren't as popular as they surely should
> be, it might be due to the low quality of the current products. Some
> claim to do so many things, most of which you've managed without for
> years. Many are just hard to understand and operate. And if the real
> software bombs as often as the Demos, you wouldn't want to risk your
> money on it.

   On the other hand, some of the software is excellent.  Boulder
   Creek Engineering, for instance, sells a pocket-size logic
   analyzer that plugs into a PC's serial port (and another one
   that plugs into a USB port)... The software (which acts as a
   demo if you don't have their hardware) is available at:

       http://www.bcreek.com

   I have one of their 8020 logic analyzers... The serial interface
   makes it a little slow, but other than that, it's a great little
   product.

   -Andy

=== Andrew Warren - .....fastfwdKILLspamspam@spam@ix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499


'Oscilloscopes'
1999\04\11@180127 by johnb
picon face
Another thing that somebody was asking was: where do you get a
second-hand oscilloscope?

The answer, if you live in UK (South) could be:

Len Cooke Enterprises,
Tel/Fax. 018 556 8221

Mr Cooke is located in East London and is a very nice man. He has a
small warehouse stuffed full of testgear of all kinds. Everything is
tested and in working order.

A used double-beam 20MHz scope can be bought for around UKP 100 or less.
This is a suitable spec for PIC-users. A 100MHz scope, if you need it,
would cost about UKP 250 or more. Scope-probes are not included; you
will need a couple of switchable X1/X10 probes, which you should buy
NEW.

If you feel you need a Handbook, ask Mr Cooke and if it exists he will
send it. But don't expect postal charges to be cheap, if you want it to
ARRIVE in working order.

I collected one from his warehouse. Afterwards, I recommend driving to
Coppermill Lane, park just before the very low bridge, walk under the
bridge to the canal, and go to the Waterside Cafe for a really cheap
lunch; for example, egg sausage and chips and a mug of tea, less than
UKP 2. Then go back to your car to find that your oscilloscope HAS NOT
been stolen. Just like the old days...

John Blackburn,
London UK.

1999\04\13@190239 by johnb

picon face
Someone has written to me pointing out a small error in the phone number
of the man who sells second-hand - I beg your pardon, second-user -
oscilloscopes. He is:

Len Cooke Enterprises,
Tel/Fax 0181 556 8221 from UK
    +44 181 556 8221 Outside UK

My correspondent adds:
Yes he is a very nice man. Not sure about the cafe.

You have to cross the bridge to get to the Waterside Cafe. It's called
"bank switching".

John Blackburn,
South London UK.

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