Author Topic: The arctubes of my SBMV lamps don't glow when i attaches it to my plasma globe  (Read 2664 times)
dor123
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The arctubes of my SBMV lamps don't glow when i attaches it to my plasma globe « on: July 08, 2011, 05:04:53 AM » Author: dor123
This is even when i attach the side of the frame wire of the lamp to the globe.
Only when i attach the base of the lamp, an argon negative glow appears between the first electrode and the third starting electrode.
Why?
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Re: The arctubes of my SBMV lamps don't glow when i attaches it to my plasma globe « Reply #1 on: July 08, 2011, 05:16:25 AM » Author: Ash
No enough potential difference - no discharge

The potential on 2 electrodes probably was too close. You can try it again, but touch one contact n the lamp base with something connected to earth (like yourself), now maybe itll light
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Re: The arctubes of my SBMV lamps don't glow when i attaches it to my plasma globe « Reply #2 on: July 08, 2011, 05:26:01 AM » Author: dor123
The glow discharge also appeared when i toughed the base while i attached the lamp to the plasma ball.
fluorescent lamps glow even when attaching their glass to the plasma globe.
Medved knows better.
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Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

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Re: The arctubes of my SBMV lamps don't glow when i attaches it to my plasma globe « Reply #3 on: July 08, 2011, 07:29:19 AM » Author: Ash
I drawn something for you
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Medved
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Re: The arctubes of my SBMV lamps don't glow when i attaches it to my plasma globe « Reply #4 on: July 10, 2011, 08:47:21 AM » Author: Medved
@Ash: This woul be valid only, if there is no discharge. Once the discharge strike somewhere, you have to treat it's path like a conductor. So e.g. probe-less lamp would glow trough the whole aectube length, the lamp with the starting probe would glow only on the probe...
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Re: The arctubes of my SBMV lamps don't glow when i attaches it to my plasma globe « Reply #5 on: July 10, 2011, 04:20:54 PM » Author: Ash
Assuming very low current, the volt drop on the starting resistor is negligible

In the example above, lets assume that 150 V was enough to strike the arc and then the struck arc clamps it down to 80 V

Those 80 V appear between main electrodes and between one main and starting probe

Electric field = voltage / distance, so the field at the starting probe is strongest, and there the arc will take place
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Re: The arctubes of my SBMV lamps don't glow when i attaches it to my plasma globe « Reply #6 on: July 28, 2011, 07:19:45 AM » Author: Medved
The arc would take place only on the starting probe, but due to the low current, I doubt it would be visible (maybe only in the dark). The voltage would be clamped to only few 10's of V, way not enough to ionise the gas elsewhere...
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