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?
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