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harvardian 15th September 2002 12:21 PM

Oscilloscope - Tek 2465A, HP 54112D Any experience
 
Hi Guys,

The ebay bug has bit and I'm torn between these two scopes:

Tek 2465A - Analog 350MHz, 4 channel - $500

HP 54112D - Digital 100MHz, color, 4 channel - $600


Anyone have an opinion?

Thanks,

Dale

P.S. For my audio diy habbit and the occasional digital microcontroller work.

grataku 15th September 2002 02:19 PM

Dale,
the tektronix is a great scope. I never used the HP.
Beware of some of the digital scope in terms of their ability to effectively look at real time signal. I have had some troubles with tek digital scopes before.
Before you go on ebay you should drive down to "Flea at MIT" in Cambrige MA it's next sunday from 9am to 1 pm, they have tons of instrumentation you can touch, feel, test, take home and you have a month warranty. If you are interested it's on the parking lot between Albany St. and main st.??...it's about about a block north-west of the Whitehead Institute.

harvardian 15th September 2002 03:42 PM

Thanks
 
I've always been meaning to go down there. I am looking for a frequency generator also, so a trip is in order.

Where are you located?

Best Regards,

Dale

grataku 16th September 2002 01:46 PM

Actually I messed up it's always on the 3rd weekend of the month so it was yesterday. The next one is going to be Oct 20 (I checked the flier).

hifiZen 18th September 2002 09:10 AM

I'd go with the Tek, no question. From my experience with the HP digital scopes, I always felt clumsy using them. The look and feel, user interface with the Tek scopes is a lot nicer IMHO. Also, if this is to be your primary hobby scope, you'll get a lot more mileage out of a 350MHz analog scope than a 100MHz digital. Not only will you have better bandwidth, but analog scopes are way better than digital for most waveforms. The only thing you don't get with most analog scopes is the storage feature. But, it's not very useful unless you're doing lots of digital work, in which case you'll find a logic analyzer much more suitable. I personally have a Tek 2445 150MHz 4Ch. sitting on my bench at home, and I love it. When I need "storage" capability, I grab my digital camera and take a picture of the screen! ;)

BTW - there's another thread on here that deals with pretty much exactly this topic...

Sysyphus 22nd September 2002 04:03 AM

having worked at Tek for many years I am biassed but......
for ausio work you cant beat a good analog scope!!!

Just have a quick check before you purchase, some old 2465s has an analog IC problem. I am sure they have all been updated bu now but try it first.

Digital scopes are useful but to use one for realtime audio it would cost far too much.

http://www.tek.com/Measurement/cgi-b...l&FrameSet=mbd

Ren 25th September 2002 11:11 AM

Sysyphus,

Thanks for your post. I'm also looking to buy a used scope for DIY audio projects, and I never thought to look at the Tektronix web site.

Ren

jackinnj 25th September 2002 11:41 AM

The 2465 is one of the best analog scopes around. There was a TDS640 which went pretty inexpensively a few weeks ago, however.<p> here's a guide to transaction prices on EBay.<p>http://www.vaxxine.com/phil/scopes/scope.htm

peranders 25th September 2002 01:31 PM

Have you checked the price of a brand new digital scope from Tek? Here in Sweden you can get those for 900-1000 USD. They are (as I remember) a little bit "plastic" if you know what I mean but the price tag is something.

dice45 25th September 2002 04:38 PM

Dale,
go for the TEK!

me is a big HP fan, i love my HP 1745A, i never found them clumsy and they trigger events that make Tek scopes look like a :car:, just not as fast. :drool:

But: for Audio you need an analogue scope and for digital you need >100MHz bandwidth. A dig.scope is fine to look at signals you know how they look like A->D artifacts, who knows? The analog scope tells you how the signal shape looks.
And it is very interesting to track glitches in a C circuit if you want to hunt the cause why it does not work as expected.
And for that too you need >100MHz BW.
To have a DSO in addition to and analoge scope is fine. To have a DSO instead, might confuse you.

One hint: buy probes having atleast 3x the BW of the scope. And if you work on tube circuits, buy some spares for the case you fry them.


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