Joule Ringer!

[xee2]

@ Conrad

It might be interesting to redo the plot without the tube in order to find out if the circled spike is from the tube turning on and off.

[hartiberlin]

Hi Conrad,
where did you set the ground line for the shunt voltage ( pink curve ) ?
There where the triangle is at the left side ?

If that is the case we can see, that the input current does not go negative and is always
consuming current from the cap and is not recharging it.

But please let me know, if I am right, that the pink triangle
at the left side shows the ground line (zero inpuut current) for
the pink trace.
Many thanks.

Regards, Stefan.

[hartiberlin]

Hi Conrad,
well, did you already invert Channel 2 (voltage at the shunt)  for this scopeshot ?
Cause of the ground problems you have to take the channel 2 shot inverted
and then need to press the invert button for channel 2 to show it the right way,
so that an upgoing curve will show current going from the capacitor into the circuit
and not the other way around.
Surely we then have to know, where the zero line ( groundline) is located on the scope.

Also what comes next is right what Xee2 asked, where exactly does the lamp
turn on and off...?
Can you measusre this with another dual channel scopeshot please ?

Then you can measure with one channel the input current and with the other
the voltage at the bulb for instance and then we can compare the 2 scope shots
and will know, when the bulb turns on and off.

Many thanks.

[conradelektro]

Comparison with and without lamp

The same scope connection points as before.

Ground line is green, each chanel can have its own ground line on the screen (but the two "grounds" are of course identical).

No invert on my cheap USB scope, I copied the "panel" with all setting possibilities into the picture.

I can not measure HV coil and anything else in the circuit together because the GND of both channels is identical and when I connect the HV coil to GND the circuit stops. So, I can only measure the HV side alone with my 1:100 probe.

Conrad

[xee2]

@ Conrad

My guess as to what is happening for first spike. I do not even have a guess as to what the second spike is.