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aeronautical 28th December 2012 03:28 PM

buying tools
 
I have made it back into DIY audio after about 30 years. In the mode of buying tools. Have most of what I need but am wanting an Oscilloscope. I have plans to build speaker and electronics...no RF though.

Does anyone have any recommnedations at to capability...range, storing, channels, etc.?

Thanks

DUG 28th December 2012 03:57 PM

Stand alone or USB based?

My recommendation is 2 channels minimum and 20MHz will cover audio and also find oscillation issues in discrete amps.

For working class D you might consider a higher bandwidth.

USB scopes can be cheap (as low as $100) and may fit your need.

One other option is to build an adapter board and use a sound card input with some of the audio software that has been mentioned in other threads. This has some advantages of gain and thd testing.

Things to think about.

Mooly 28th December 2012 04:28 PM

I'd go for a good analogue scope, I wouldn't hesitate. The resolution on complex waveforms is "infinite" within its bandwidth, the digital scope (unless you pay megabucks) doesn't come close.

Two shots of what should be identical waveforms, post #24 here
http://www.diyaudio.com/forums/digit...ml#post3290406
It seemed as though the digital scope couldn't resolve what is a complex waveform.

And this is from my analogue scope

http://static.diyaudio.com/forums/ga...Volts_PkPk.jpg

DUG 28th December 2012 04:48 PM

Tektronix 2213 is a good example

2 ch, 2mV/div, 60MHz

There are many others like it.

aeronautical 30th December 2012 01:36 AM

Does anyone have any thoughts about TENMA?

I know Fluke would be nice but I am trying to remind myself this is a hobby...for fun.

DUG 30th December 2012 03:01 AM

I don't have experience with TENMA scopes...just the DMM the boss picked out.

Seems accurate enough but you will have to count to 5 to get a reading.

Kinda slow.

My 2 cents worth.

radiotron 30th December 2012 05:18 AM

If you don't mind looking at used 'scopes, the analogue Hitachis are good - I have a somewhat older V1065 that has a nice crisp CRT and triggers reliably (Mooly - nice pic of CDP RF eye pattern, a good test!), and Iwatsu made many reasonable analogue 'scopes that are often found in cleanouts of defunct TV repair businesses, the CRTs are a bit variable when they get old however - try before you buy unless dirt cheap.

Mooly 30th December 2012 07:09 AM

Quote:

Originally Posted by aeronautical (Post 3303823)
Does anyone have any thoughts about TENMA?

I know Fluke would be nice but I am trying to remind myself this is a hobby...for fun.

Tenma... dare I say cheap and cheerful. I have a Tenma function generator which while excellent for the price had an annoying and extremely hard to find intermitent fault which I eventually traced to a dodgy crimped lead in a multiway plug.

I agree with radiotron, a used scope would be far better. I used to use an Hitachi for work day in day out... it was excellent...a along with an older Trio.

My own is a Hung Chang 5510, 100Mhz, the 100Mhz version of this,
Hung Chang 5506 Oscilloscope 60 MHz 3 Channel | eBay

Enzo 31st December 2012 07:17 PM

I have always used good scopes. Just to see, I bought a $300-400 (I forget exactly) Tenma scope from MCM for the bench, and it has worked just fine and flawlessly for a couple years now.

aeronautical 31st December 2012 07:53 PM

I have a few pieces of TENMA gear. DMMs and temparture meters. Not sure where the name comes from. I think it is the the electronics equivolent for Harbor Freight...which is fine. You just have to be aware of what it is.

I see the brand Tektronix quite a bit. Wondering if it is as good as the price it demands. I have nothing against buying used but I haven't had much luck in that area, so I buy new when I can. Just my experience.


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