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Behringer UMC 202HD for measurements
Behringer UMC 202HD for measurements
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Old 6th August 2020, 12:44 PM   #91
ginetto61 is offline ginetto61  Italy
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Behringer UMC 202HD for measurements
Quote:
Originally Posted by Vovk Z View Post
And if you use ARTA (or smth else) - make sure you use ASIO drivers, like at my screen:
Thanks a lot ! do these drivers usually come with the card ? or can they be found somewhere ?
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Old 8th August 2020, 08:46 PM   #92
Vovk Z is offline Vovk Z  Ukraine
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Unfortunately I don't know anything about Behringer soundcards. I'm not even sure if it has ASIO drivers (but it has to has I think). Have you checked thoose ARTA settings? What you have in that list?
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Old 9th August 2020, 08:52 AM   #93
MagicBus is offline MagicBus  Greece
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Yes, UMC 202HD comes with ASIO drivers. Common practice for most sound cards today.
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Old 11th August 2020, 08:36 AM   #94
ginetto61 is offline ginetto61  Italy
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Behringer UMC 202HD for measurements
Quote:
Originally Posted by Vovk Z View Post
Unfortunately I don't know anything about Behringer soundcards. I'm not even sure if it has ASIO drivers (but it has to has I think). Have you checked thoose ARTA settings? What you have in that list?
Hi ! if you mean the drivers i am using windows default drivers ... the soundcard is plug and play
But it looks to me that the preamp is indeed the key in this kind of measurements
Not easy to build one rightly ... the preamp added noise must be clearly minimal

Quote:
Originally Posted by MagicBus View Post
Yes, UMC 202HD comes with ASIO drivers. Common practice for most sound cards today.
i think i will try one very soon. Great card for the asking price indeed. Thanks for the advice.
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Old 11th August 2020, 08:39 AM   #95
pelanj is offline pelanj  Czech Republic
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Behringer UMC 202HD for measurements
One small tip - if your soundcard does not have ASIO drivers, try ASIO4ALL. I do not know how it works, but it worked for my old M-Audio BlackBox in Windows 10 - and it does not even support W10 AFAIK.
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Old 11th August 2020, 08:57 AM   #96
ginetto61 is offline ginetto61  Italy
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Behringer UMC 202HD for measurements
Quote:
Originally Posted by pelanj View Post
One small tip - if your soundcard does not have ASIO drivers, try ASIO4ALL. I do not know how it works, but it worked for my old M-Audio BlackBox in Windows 10 - and it does not even support W10 AFAIK
Hi ! thank you very much indeed. But seriously this card was almost taken from a garbage bin I will get a Behringer and fix my attention of the signal preamplification. I think that in the end is always a matter of keping the S/N ratio as higher as possible ? And a very low noise external preamp should be much better that those usually available inside a cheap sound card ... i guess
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Old 30th September 2020, 12:10 AM   #97
jansen2810 is offline jansen2810
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Something else. Did you all build your own soundcard protection interface mentioned before? Is there a ready made one available somewhere?
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Old 30th September 2020, 02:51 AM   #98
fredbloggstwo is offline fredbloggstwo  United Kingdom
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Hi there,

I have just read your thread here and about the annoying 19KHz problem. Could it be radiation from a CRT monitor nearby?

Regards

Mike
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Old 30th September 2020, 03:31 AM   #99
trobbins is offline trobbins  Australia
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The UMC202HD USB has a 1 megohm unbalanced input, which is similar to the EMU0404 USB I have. The simplest interface I can recommend, to allow direct measurement of highish AC voltage levels (such as from speaker outputs of amplifiers, or from signal levels within an amp where the DC level is not too high) is to use a general purpose 10:1 or 100:1 scope probe. The BNC connector on the scope probe can be coupled to the UMC202HD via a BNC to RCA metal adaptor followed by an RCA to 1/4" jack metal adaptor.

Using the unbalanced input may make the measurement spectrum more prone to hum and USB related parasitic signals, due to a PC and DUT common mains AC powered loop. However, you can personally disregard parasitic signals if you know why they are there, and they didn't interfere with a measurement you are making (eg. THD, IM, harmonic or noise floor assessments), other than aesthetic reporting concerns. Also you can alleviate any such loop parasitics by either using a battery powered laptop, or a battery powered USB isolator.

Using a scope probe can roll off the high frequency response prior to 96kHz, and may require modification of the probe's compensation capacitance if the trimmer is not sufficient to provide basic compensation flatness of a spectrum plot (that result will depend on the probe's trimmer adjustment range, and the interface's inherent input capacitance). If flat line loopback is needed for aesthetic reporting, or to make some measurements easier to immediately interpret, then the use of a calibration file for automated adjustment is certainly easy in REW (which pretty much has to be done for the low frequency end anyway if your interest goes down to 2Hz).

The convenience of a scope probe may not better the use of a custom divider and balanced input interface, but for a lot of benchwork I find it is quite sufficient, and in some equipment where probe loading can alter the measurement then the effectively very high impedance of a scope probe wins hands-down.

Last edited by trobbins; 30th September 2020 at 03:43 AM.
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Old 30th September 2020, 08:53 AM   #100
MagicBus is offline MagicBus  Greece
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Quote:
Originally Posted by jansen2810 View Post
Something else. Did you all build your own soundcard protection interface mentioned before? Is there a ready made one available somewhere?

As stated, I use Pete Millett's PC interface. There are other options too like Jan Didden's Autoranger. It's not difficult to build your own and @trobbins suggestions for a scope probe seems interesting too.


Quote:
Originally Posted by fredbloggstwo View Post
Hi there,

I have just read your thread here and about the annoying 19KHz problem. Could it be radiation from a CRT monitor nearby?

Regards

Mike

One thing for sure is that the high pitched noise is created by the soundcard itself somewhere in the digital section.


I have moved to a new project, a diy soundcard from scratch, complete with input protection. Not top class performance, the target is the low cost commercial soundcards. Just avoiding all these compromises by design.
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