I must admit it, what happened goes beyond my logic, so I need help to understand. My two computers and the peripheral devices are powered through an UPS (backup power). I use 3 power strips to power all these guys.
This morning I noticed that the loudspeakers of my PC where down. After a few tests ...conclusion : the transformer is dead (it has no ground pin). So I turned on my two bigger loudspeakers (KRK Rokit 5), ... well I couldn't ... After a few tests ... conclusion : the fuses are blown. I changed both fuses with the spare fuses, the loudspeaker turned on 10 seconds and then ... blown fuses again. I thought that there was a problem with the loudspeakers.
I found new pc loudspeakers. I plugged their transformer in one of the power strips (it has no ground pin). It worked, 3 minutes, but the volume was low and an ugly overdrive occurred in my music. Then the transformer blew up too.
I started thinking that these events were connected (I am a fast thinker) ...
I measured the tension : 237 volts (after UPS and before and in several other plugs in the house ... which is normal in France (where I live) The state electricity company told me that tension ins considered normal up to 250 volts.
All the other devices inducing computer work perfectly. ... but I wonder if it is really reasonable to use them.
Tension between ground pins (UPS, powerstrips after UPS, and house) :
I can't detect any in alternating current. (my voltmeter has a 200v min caliber ...)
In continuous current one power strip has 2 mV with the others (the one with computer n°2 ... this tension disappears if i unplug it)
Anyway I have no explanation (UPS ? power strips ? ) ... and i need to do my work. I know that life would be worse if the Great Plague was back but i will be grateful to any person able to give me a clue.
Thanks, Nicolas, France
This morning I noticed that the loudspeakers of my PC where down. After a few tests ...conclusion : the transformer is dead (it has no ground pin). So I turned on my two bigger loudspeakers (KRK Rokit 5), ... well I couldn't ... After a few tests ... conclusion : the fuses are blown. I changed both fuses with the spare fuses, the loudspeaker turned on 10 seconds and then ... blown fuses again. I thought that there was a problem with the loudspeakers.
I found new pc loudspeakers. I plugged their transformer in one of the power strips (it has no ground pin). It worked, 3 minutes, but the volume was low and an ugly overdrive occurred in my music. Then the transformer blew up too.
I started thinking that these events were connected (I am a fast thinker) ...
I measured the tension : 237 volts (after UPS and before and in several other plugs in the house ... which is normal in France (where I live) The state electricity company told me that tension ins considered normal up to 250 volts.
All the other devices inducing computer work perfectly. ... but I wonder if it is really reasonable to use them.
Tension between ground pins (UPS, powerstrips after UPS, and house) :
I can't detect any in alternating current. (my voltmeter has a 200v min caliber ...)
In continuous current one power strip has 2 mV with the others (the one with computer n°2 ... this tension disappears if i unplug it)
Anyway I have no explanation (UPS ? power strips ? ) ... and i need to do my work. I know that life would be worse if the Great Plague was back but i will be grateful to any person able to give me a clue.
Thanks, Nicolas, France