ProSoundWeb Community

Please login or register.

Login with username, password and session length
Advanced search  

Pages: [1] 2 3   Go Down

Author Topic: USB Oscilloscope for Audio Work  (Read 1327 times)

Steve-White

  • Hero Member
  • *****
  • Online Online
  • Posts: 513
  • Fort Worth
USB Oscilloscope for Audio Work
« on: April 18, 2021, 12:19:12 am »

I've seen this discussed a few times, probably here on PSW, but can't find what I'm looking for using the search engine.

I'm considering adding a USB scope module to the bench.  Seems like a 4ch setup would be real nice for amp testing.  Run both channels on a dummy load and be able to compare input to output.

As well testing DSC's to ensure they are doing what they are setup to do.

Anybody have any experience with these?  Which brands, etc?

http://www.hantek.com/products/detail/10164

A stand alone could be simpler overall:  https://siglentna.com/product/sds1104x-e-100-mhz/

Thx
« Last Edit: April 18, 2021, 01:04:54 am by Steve-White »
Logged

Chris Grimshaw

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1643
  • Sheffield, UK
    • Grimshaw Audio
Re: USB Oscilloscope for Audio Work
« Reply #1 on: April 18, 2021, 08:17:40 am »

I don't know how useful it'll be, but there's a scope built into REW (NB - I'm using the Pro version, can't remember if it's on the free version) which seems to work fine. You'd be limited by the input of your audio interface in terms of sample rate etc. While my (old, analogue) scope runs at 20MHz, my audio interfaces run at 192kHz. Quite the difference.

Curious to see what you end up with.

Chris
Logged
Sheffield-based sound engineering.
www.grimshawaudio.com

Steve-White

  • Hero Member
  • *****
  • Online Online
  • Posts: 513
  • Fort Worth
Re: USB Oscilloscope for Audio Work
« Reply #2 on: April 18, 2021, 08:44:06 am »

I'll give it a look, seems like I have REW on one of the laptops.
Logged

Riley Casey

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1643
Re: USB Oscilloscope for Audio Work
« Reply #3 on: April 18, 2021, 10:17:11 am »

The Metric Halo Spectra Foo software has an Oscope function.

Frank Koenig

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1144
Re: USB Oscilloscope for Audio Work
« Reply #4 on: April 18, 2021, 11:11:13 am »

In the absence of any specific recommendation (sorry) the first question I think is whether the input characteristics of an audio interface are sufficient or if you need conventional oscilloscope inputs. (I know you know this but I'll spew a few thoughts for my own benefit, if no one else's.) Scope inputs have bandwidth sufficient to show spurious oscillations, RF interference, etc. They typically have 10 M Ohm input resistance with a small shunt capacitance, have built-in ability for AC coupling , low-pass filters, a wide signal amplitude range and compatibility with probes that provide accurate transient representation. They are far more tolerant of out-of-range signals that might toast an audio interface.

An audio interface, on the other hand, will have finer amplitude quantization, which allows distortion and noise measurements, and is perfect for balanced mic and line signals.

For amplifier testing you'll likely need two inputs per amp channel since amp outputs cannot be relied upon to have one side grounded. The app should have the ability to subtract the signals from one another to create a differential input. (There are other ways around this, such as using a transformer, but that introduces its own aberrations.)

I'd take a hard look at the app. The finest piece of hardware won't matter if the app is unusable. Also cross-shop with stand-alone scopes. For a little more money you can get a "real" scope that will never want to update its OS right when you actually need to do something  >:(

Good luck and tell us what you end up with.

--Frank
Logged
"Nature abhors a vacuum tube." -- John Pierce, Bell Labs

Steve-White

  • Hero Member
  • *****
  • Online Online
  • Posts: 513
  • Fort Worth
Re: USB Oscilloscope for Audio Work
« Reply #5 on: April 18, 2021, 02:52:55 pm »

Moving away from a PC based solution to a stand-alone scope.  Looks like something suitable with 4ch capability can be picked up in the $500 range.
Logged

Frank Koenig

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1144
Re: USB Oscilloscope for Audio Work
« Reply #6 on: April 18, 2021, 05:50:06 pm »

Moving away from a PC based solution to a stand-alone scope.  Looks like something suitable with 4ch capability can be picked up in the $500 range.

Look at Rigol. No direct experience but a trusted friend with much industry experience recommended them to me a few years ago. --Frank
Logged
"Nature abhors a vacuum tube." -- John Pierce, Bell Labs

Ike Zimbel

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 656
  • I'm not a newbie, I just play one on the internet!
    • Zimbel Audio Productions
Re: USB Oscilloscope for Audio Work
« Reply #7 on: April 19, 2021, 12:05:06 pm »

Look at Rigol. No direct experience but a trusted friend with much industry experience recommended them to me a few years ago. --Frank
Hmmm. I have Rigol DS1102E on my bench and while it works, I do not love it. I know that's an entry level product, but that might be at least an indication to look above entry level. Another thing to keep in mind is that cheap scopes come with cheap probes, which can be a real liability.
Logged
~Ike Zimbel~
Wireless frequency coordination specialist and educator.
Manufacturer's Representative (Canada)
Radio Active Designs
Pro Audio equipment repair and upgrades.
~416-720-0887~
ca.linkedin.com/pub/ike-zimbel/48/aa1/266

Frank Koenig

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1144
Re: USB Oscilloscope for Audio Work
« Reply #8 on: April 19, 2021, 01:13:52 pm »

Another thing to keep in mind is that cheap scopes come with cheap probes, which can be a real liability.

True. To put things in perspective, one probe for my Tektronix scope costs almost twice as much as much as an entire Rigol DS1102E. And those are not by any means the most expensive probes. We used to joke about the terror of running over a $1000 scope probe with your office chair. It would likely make a little crunching noise. I've come close. --Frank
Logged
"Nature abhors a vacuum tube." -- John Pierce, Bell Labs

Mark Wilkinson

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1053
Re: USB Oscilloscope for Audio Work
« Reply #9 on: April 19, 2021, 02:02:28 pm »


Two $500 or less digital scopes that appear to be consensus favorites on EEVblog and other techy sites, are the Rigol DS1054Z at $350, and a bit more capable  Siglent SDS1104X-E at $500.
I have the Rigol and it is far more capable than I am...  If i were choosing again, i'd get whichever one had the easiest menu navigation & settings methods.
For amp testing I really like an old Fluke 123 battery powered handheld......it's isolated and i can't blow it up haha....and it's a handy little bugger.
Logged

ProSoundWeb Community

Re: USB Oscilloscope for Audio Work
« Reply #9 on: April 19, 2021, 02:02:28 pm »


Pages: [1] 2 3   Go Up
 



Page created in 0.081 seconds with 24 queries.