Sparky Dave:
Sparky Dave:
Kelly Marie Angel:
Out of interest I connected my scope to the 7.2v winding of a heater transformer and then plugged in a table lamp borrowed from the house switching the lamp on and off with its own switch made a few flicks on the mains waveform they were too fast to see properly. However turning the socket switch on and off as slowly as I could produced similar traces to the OPS ie noticeable fuzz on the positive and negative crests of the mains wave assuming im understanding it correctly I was producing spikes of 5 to 10 volts over the peak mains volts all this from a humble light bulb the RFI was clearly audible on my radio in the same room tuned to 648 kilocycles although I'm sure the noise would of been all over the placeThat's interesting! I'm guessing you'll see all kinds of weird and wonderful anomalies through the scope. It's the significantly higher amplitudes of the distortions that interested me between the "dirty" ring and the better one but like I say, I think i've gone as far as my understanding will take me regarding scope readings but just purely out of interest and because sharing is caring i'll stick some pics on of that little setup I mentioned on Friday and show you the scope readings.
This is just a little one man station on a separate circuit (L3) next door. It's a 1M HDMI lead (3 ohms outer to outer) that goes from a Laptop and plugs in to a pre-wired station that has HDMI leads from a socket to a Monitor (not measured) The monitor is a 12V monitor fed via a power supply from a 4 way extension lead ( yes i'm going to try and disconnect this power supply tomorrow and see if it has been causing all this fuss all along!)
The readings shown are with the lap top plugged in to the HDMI socket (Green line measuring where the outer of the HDMI is showing whilst plugged in to the socket) and then another reading is with the Laptop HDMI lead unplugged and the green line probe straight on to the HDMI socket feeding the TV. Both instances, the TV is on standby.
Sparky Dave:
Sparky Dave:
Kelly Marie Angel:
Out of interest I connected my scope to the 7.2v winding of a heater transformer and then plugged in a table lamp borrowed from the house switching the lamp on and off with its own switch made a few flicks on the mains waveform they were too fast to see properly. However turning the socket switch on and off as slowly as I could produced similar traces to the OPS ie noticeable fuzz on the positive and negative crests of the mains wave assuming im understanding it correctly I was producing spikes of 5 to 10 volts over the peak mains volts all this from a humble light bulb the RFI was clearly audible on my radio in the same room tuned to 648 kilocycles although I'm sure the noise would of been all over the placeThat's interesting! I'm guessing you'll see all kinds of weird and wonderful anomalies through the scope. It's the significantly higher amplitudes of the distortions that interested me between the "dirty" ring and the better one but like I say, I think i've gone as far as my understanding will take me regarding scope readings but just purely out of interest and because sharing is caring i'll stick some pics on of that little setup I mentioned on Friday and show you the scope readings.
This is just a little one man station on a separate circuit (L3) next door. It's a 1M HDMI lead (3 ohms outer to outer) that goes from a Laptop and plugs in to a pre-wired station that has HDMI leads from a socket to a Monitor (not measured) The monitor is a 12V monitor fed via a power supply from a 4 way extension lead ( yes i'm going to try and disconnect this power supply tomorrow and see if it has been causing all this fuss all along!)
The readings shown are with the lap top plugged in to the HDMI socket (Green line measuring where the outer of the HDMI is showing whilst plugged in to the socket) and then another reading is with the Laptop HDMI lead unplugged and the green line probe straight on to the HDMI socket feeding the TV. Both instances, the TV is on standby.
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