mapj1:
Interesting results of the swap test. So, the spikes are not coming in down the main supply. Pity, as catching them at that point would have been easy.
So either (1) !the problem is conducted but not via the incoming mains or (2)radiated and received.
1) There is a spike generator plugged into ring 2, and that could be one icky lead, one loose terminal in a socket, an arcing switch or something inside a PC or monitor,
2) The spikes are picked up by the leads and wiring layout acting as an unlucky pick-up antenna, and something else, either electrostatic, or switched loads on another circuit some distance away is 'illuminating' this, in just the right way and the right sort of attack waveform to make the large voltages pile up in the wrong places.
I presume there is nothing special about the dirty ring - it is a ring and all 3 cores follow the same route no great loops where N and L diverge or spurs to feed something next door.....
If you wanted this to happen to order it would be really quite hard to arrange. I feel your pain, this sort of thing can be right sod to identify, even more so with limited access.
I do not really have more to suggest I'm afraid, but others may, and in any case keep us posted.
Mike.
I'm thinking it's 2) to be honest. Once these patch leads arrive i'm really hoping it will at least mask the problem.
The ring is so straight forward and the Spark that installed it is a really decent sparks that they use all the time. The only difference is that it looks like the dirty ring is wired in 4.0mm2 as it's stranded and the other ring is solid strand 2.5mm2 which may or may not have had an influence regarding electron flow around the outer surface, more surface area and all that jazz but who knows... not me that's for sure! haha!
I just stuck the scope on a little one man station on the other side of the wall in a different room and on a different phase that's using a laptop plugged in via a HDMI lead to a small monitor and let's just say I wish I hadn't as I really do not understand what I saw there! ? Measuring the outer of the HDMI lead whilst plugged in to the laptop but with the monitor switched off and it was all over the place!! Shame I can't show a video but i'm definitely going to stop looking at the scope now as suggested as it's causing more confusion than anything else!...... I'll keep you posted next week if I make any progress and thanks to all that have tried to understand my ramblings!
mapj1:
Interesting results of the swap test. So, the spikes are not coming in down the main supply. Pity, as catching them at that point would have been easy.
So either (1) !the problem is conducted but not via the incoming mains or (2)radiated and received.
1) There is a spike generator plugged into ring 2, and that could be one icky lead, one loose terminal in a socket, an arcing switch or something inside a PC or monitor,
2) The spikes are picked up by the leads and wiring layout acting as an unlucky pick-up antenna, and something else, either electrostatic, or switched loads on another circuit some distance away is 'illuminating' this, in just the right way and the right sort of attack waveform to make the large voltages pile up in the wrong places.
I presume there is nothing special about the dirty ring - it is a ring and all 3 cores follow the same route no great loops where N and L diverge or spurs to feed something next door.....
If you wanted this to happen to order it would be really quite hard to arrange. I feel your pain, this sort of thing can be right sod to identify, even more so with limited access.
I do not really have more to suggest I'm afraid, but others may, and in any case keep us posted.
Mike.
I'm thinking it's 2) to be honest. Once these patch leads arrive i'm really hoping it will at least mask the problem.
The ring is so straight forward and the Spark that installed it is a really decent sparks that they use all the time. The only difference is that it looks like the dirty ring is wired in 4.0mm2 as it's stranded and the other ring is solid strand 2.5mm2 which may or may not have had an influence regarding electron flow around the outer surface, more surface area and all that jazz but who knows... not me that's for sure! haha!
I just stuck the scope on a little one man station on the other side of the wall in a different room and on a different phase that's using a laptop plugged in via a HDMI lead to a small monitor and let's just say I wish I hadn't as I really do not understand what I saw there! ? Measuring the outer of the HDMI lead whilst plugged in to the laptop but with the monitor switched off and it was all over the place!! Shame I can't show a video but i'm definitely going to stop looking at the scope now as suggested as it's causing more confusion than anything else!...... I'll keep you posted next week if I make any progress and thanks to all that have tried to understand my ramblings!
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