[LAU] ground-loops -- was Re: USB audio interfaces >= 8 channels

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To: Fons Adriaensen <fons@...>, A list for linux audio users <linux-audio-user@...>
Date: Tuesday, May 15, 2012 - 9:43 pm

On 05/15/2012 10:59 PM, Fons Adriaensen wrote:

They were not measure simultaneously. I first measured the voltage and
_then_ the current. In both cases the device was not directly connected:
I measured between USB-plug and socket shield.

I expect that the voltage potential drops to near zero when I measure
the current, but I have no way of verifying this (I don't have a 2nd
multimeter at hand).

> This gets confusing.

Thanks for getting back to me about this nevertheless.

> You have at least four items, laptop, UA-25, screen,

Screen <-VGA-> Laptop (TP X60s) <-USB-> UA-25 <-TRS/jack-> Speaker(s)

All devices are connected to one power-strip (except the UA25 which
takes power from USB). To take one more thing out of the equation, I run
the computer on battery. So it's Screen vs. Speaker.

The screen has a switching power supply, but the speaker has a hardwired
one (230V fixed).

Any suggestions before I add a switch to the ground of the screen?

bzzzzzzt,
robin
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Messages in current thread:
[LAU] USB audio interfaces &gt;= 8 channels, Robin Gareus, (Tue May 15, 10:07 am)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Fons Adriaensen, (Tue May 15, 4:10 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Robin Gareus, (Tue May 15, 6:44 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Fons Adriaensen, (Tue May 15, 8:59 pm)
[LAU] ground-loops -- was Re: USB audio interfaces >= 8 c..., Robin Gareus, (Tue May 15, 9:43 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Paul Davis, (Tue May 15, 10:34 am)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Robin Gareus, (Tue May 15, 10:41 am)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Fons Adriaensen, (Tue May 15, 12:36 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Robin Gareus, (Tue May 15, 1:31 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Clemens Ladisch, (Tue May 15, 6:03 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Robin Gareus, (Tue May 15, 11:24 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Paul Davis, (Tue May 15, 8:16 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Robin Gareus, (Wed May 16, 9:28 am)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Fernando Lopez-Lezcano, (Wed May 16, 11:13 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Paul Davis, (Wed May 16, 2:14 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Fernando Lopez-Lezcano, (Tue May 15, 5:10 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Emanuel Rumpf, (Tue May 15, 8:52 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Fernando Lopez-Lezcano, (Tue May 15, 5:11 pm)
Re: [LAU] USB audio interfaces &gt;= 8 channels, Paul Davis, (Tue May 15, 11:03 am)