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Old 20th April 2013, 12:52 PM   #11
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Join Date: May 2011
Location: Virginia
Quote:
Originally Posted by qusp View Post
you dont understand a preamp stage powered by USB, so noise will be a limiting factor and likely will have quite a bit of bleed from the PC its used with? for a higher budget i'm sure it could be made to work, but i'm pretty sure this wont be great. a voltage pretty much limited to testing line level?. that it has a bandwidth of 2MHz does not mean it can be sufficient to show much about 2MHz signals. It will tell very little about common mode noise bandwidth (pretty important in todays world and considerably higher speed) wont say much about a reasonably fast feedback loop or opamp instability, wont touch clock speeds. etc etc.

educational and basic troubleshooting only for limited circuits, I dont think its suitable for a real diagnostic tool.

it could however be used in conjunction with an older fast analogue scope. unless you really need the USB and data logging there are better options for the money on the used market
Instead of bashing this one, perhaps you could show us one that meets your specifications and costs less than $200? (this one costs $189)

I'm sure there are plenty of mega-buck scopes out there that would meet your needs, and you're free to buy one, but I still think this is pretty good for the money.
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Old 20th April 2013, 01:17 PM   #12
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Originally Posted by dirkwright View Post
Instead of bashing this one, perhaps you could show us one that meets your specifications and costs less than $200? (this one costs $189)
Think used.

Here's a 60MHz scope for $300:

Tektronix TDS 210 Scope | eBay

It's digital and can capture and store waveforms. I've got the FFT and GPIB modules that interface with a PC. Not the quietest thing, but plenty good for my needs.

I also have a couple analog scopes, which for general audio work are more useful than a digital scope, and you can get those all day long on ebay for pennies on the dollar:

Tektronix 475 250MHz Dual Trace Digital Oscilloscope 2 CH Scope Tested Working | eBay


Before I'd buy a chinese scope of questionable quality, I'd be all over one of the thousands of used Tek scopes on ebay. Also check HP, who made some fine scopes, but are not quite as well known, and thus deals can be had. HP had some lemons, so do your homework.

Personally I'm looking for a LeCroy WaveRunner...

Sheldon

Last edited by stokessd; 20th April 2013 at 01:20 PM.
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Old 20th April 2013, 01:55 PM   #13
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I have an old HP 1200 scope myself. It's a high sensitivity (down to 0.1mV/div vertical), low bandwidth scope with balanced inputs. I'm not looking for a new one really.

I have toyed with the idea of designing new vertical amplifiers for it though...
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Old 20th April 2013, 01:56 PM   #14
Jaimo is offline Jaimo  Canada
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Quote:
Originally Posted by stokessd View Post
Think used.

Before I'd buy a chinese scope of questionable quality, I'd be all over one of the thousands of used Tek scopes on ebay. Also check HP, who made some fine scopes, but are not quite as well known, and thus deals can be had. HP had some lemons, so do your homework.

Personally I'm looking for a LeCroy WaveRunner...

Sheldon
A secondhand analog scope is a good idea but buyer beware! I have two junked ebay scoped to prove this.There's loads of dubious sellers on EBay - look out for the people who claim that they are unable to verify proper operation and try to buy from sellers who guarantee that the scope is fully operational and tested. Calibration is another questionable area- many so called calibrated scopes are not really calibrated and sellers count on the buyer not being in a position to verify calibration. Also make sure you can obtain service manuals for S/H scopes before buying one. 20 year old scopes don't last forever and you will at some point need to do some repair work.

Also, don't write off all Chinese scopes as being cheap and suspect. Do your research first. Rigol is reputable and has built some budget scopes for Agilent.

Last edited by Jaimo; 20th April 2013 at 02:00 PM.
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Old 22nd April 2013, 05:15 AM   #15
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I have the Rigol it is a nice value for the money but I thought I would replace my analog scope with it but no way. In truth though I have yet to use the more advanced features .To look at analog waveforms I prefer my old scope. I have become spoiled using 2 scopes as I can monitor power supply and output at the same time.
Bill
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Old 18th July 2013, 09:49 PM   #16
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...or a really good dual-trace...

My old solid-state analog drifted all over the place.

I like that some of the new Tektronix digital scopes have truly well-isolated probe inputs, and though I know there's no such thing as idiot-proof, I prefer idiot-resistant to feeling like one after an expensive mistake.
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Old 4th September 2013, 07:46 PM   #17
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Default It's only $189.00

I wasted more on bad eBay buys than $189.00. That's one reason I do not like
to purchase used equipment from eBay. You never know what you are getting or
whether it works or not. Must eBay stores don't have the equipment to repair and
calibrate scopes and other electronic equipment. It takes a lot of money to set up such
a lab.

Maybe some one could talk to the Pico people about a group buy thru them.
I think they are one of the best digital PC scope but they are very expensive.
A large group buy might lower the cost. Any other ideas?
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Old 5th September 2013, 12:50 PM   #18
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Originally Posted by Jaimo View Post
A stand alone scope is my preference- especially since the prices have come down to affordable levels. You may want to consider a Rigol DS1052E for around US325.
Good call, great piece of kit for the money. Hoping to get one of these soon.
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Old 5th September 2013, 02:10 PM   #19
avp1 is offline avp1  United States
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Originally Posted by passive420 View Post
Good call, great piece of kit for the money. Hoping to get one of these soon.
Group buy for Rigol 2072 would be a best option. Their 1000 series is at rock bottom price already.
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Old 5th September 2013, 02:36 PM   #20
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I want at least a few knobs.
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