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4hv.org :: Forums :: Electromagnetic Radiation
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Grenadier's big thread of Röntgen related shenanigans

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Adam Munich
Thu Apr 21 2011, 09:26PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Hmm, I'll probably do that then, although the distance between the 2 terminals is about the same as the distance on the flyback's container and nothing seems to have gone wrong there, even tough it's been powered up multiple times.

I suppose nothing can go wrong by putting plastic there though, now to find a shard of plastic...
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James
Thu Apr 21 2011, 09:40PM
James Registered Member #3610 Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
Grenadier wrote ...


As for the expansion thing, I just cut off a finger and stuck it in the hole. It works and it doesn't leak, even without glue.


That sounds a little extreme :)
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magnet18
Fri Apr 22 2011, 02:07AM
magnet18 Registered Member #3766 Joined: Sun Mar 20 2011, 05:39AM
Location: 1307912312 3766 FT117575 Indiana State
Posts: 624
I had surface tracking occur on a flyback before from pin to pin... that flyback is no more.
Theres not much you can do about it once it starts, so make sure it doesn't.
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Adam Munich
Fri Apr 22 2011, 05:52AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I am now in possession of the most awesome kilovoltmeter ever. Link2

Wait for it... Boom! Link2
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magnet18
Fri Apr 22 2011, 10:25AM
magnet18 Registered Member #3766 Joined: Sun Mar 20 2011, 05:39AM
Location: 1307912312 3766 FT117575 Indiana State
Posts: 624
Grenadier wrote ...

I am now in possession of the most awesome kilovoltmeter ever. Link2

Wait for it... Boom! Link2

I want one...
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Xray
Fri Apr 22 2011, 02:47PM
Xray Registered Member #3429 Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
Grenadier wrote ...

I am now in possession of the most awesome kilovoltmeter ever. Link2

Wait for it... Boom! Link2

That meter by itself can't measure hv, right? I suspect that it is only part of a complete meter assembly that includes a hv resistor dividor.
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Adam Munich
Fri Apr 22 2011, 03:19PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Yes the divider is inside the tubehead, it's a 1.8G resistor string. (4x 450M resistors)
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James
Fri Apr 22 2011, 05:06PM
James Registered Member #3610 Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
magnet18 wrote ...

I had surface tracking occur on a flyback before from pin to pin... that flyback is no more.
Theres not much you can do about it once it starts, so make sure it doesn't.


If you catch it quick enough and cut the power, you can usually scrape off the carbon and apply some silicone to keep it from arcing.
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magnet18
Fri Apr 22 2011, 08:16PM
magnet18 Registered Member #3766 Joined: Sun Mar 20 2011, 05:39AM
Location: 1307912312 3766 FT117575 Indiana State
Posts: 624
James wrote ...

magnet18 wrote ...

I had surface tracking occur on a flyback before from pin to pin... that flyback is no more.
Theres not much you can do about it once it starts, so make sure it doesn't.


If you catch it quick enough and cut the power, you can usually scrape off the carbon and apply some silicone to keep it from arcing.

My bad, meant to say once it's established.
on a similar note... superglue is conductive... and it burns bright yellow.

[EDIT]
@ grenadier, where does the backlight (I'm assuming LED's) get it's power?
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Adam Munich
Fri May 27 2011, 03:11AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Alright then here is what I have.

A working multiplexed nixie display, a new box with a CNC'd cover, and most of the circuitry, aside from the battery section done.

Now I have come to a crossroad, should I glue a second box to it like I did before, or should I keep the actual x-ray head seperate and connect it via a cable? I could fasion a cable using octal base tube sockets and some hose. Keeping the head seperate means that positioning it will be easier, however that also means that some potentially high voltage wires will need to go back to the meters.

If the meters are working OK the wires will be at low voltages, <10V, however if a meter goes open circuit then those wires are no longer pulled down to ground and will get quite hot. Example, the mA meter is in series with the tube and ground. If it goes open circuit then one side is +HV and the other is ground. Maybe some MOVs could protect things...

1306465847 2893 FT90619 Dsc02014
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