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#1
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Vintage DC kilovolt meter - wiring multiplier resistors - kilovoltmeter3views.jpg (0/1)
I have just bought a vintage (1943?) DC 25-kilovolt meter (for a
Steam-Punk style 10kv Jacob's Ladder project). It is built into a box (photograph attached). On the underside of the box someone has written: Meter res = 50 ohm LV res = 4950 Hi res = 99950 Inside the box are two resistors (one loose, one soldered one end to an external terminal but not connected to the meter), values: 1 x 4950 ohms 1 x 95k ohm The meter has three terminals, two main, one smaller in the centre. The box has two connection terminals and a push-switch, which I presume was intended to select the appropriate multiplier resistor. I found an informative piece on rating by Curt Reed at http://www.antiqueradios.com/forums/...ad4ccd433b5184 (posted: Jul Wed 21, 2010 10:16 pm) If anyone knows what the central terminal is for, and can offer any advice on how the meter could be wired for 25kv operation, that would be better than my guesswork. Thank you |
#2
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Vintage DC kilovolt meter - wiring multiplier resistors - kilovoltmeter3views.jpg(0/1)
glutinous wrote:
I have just bought a vintage (1943?) DC 25-kilovolt meter (for a Steam-Punk style 10kv Jacob's Ladder project). It is built into a box (photograph attached). On the underside of the box someone has written: Meter res = 50 ohm LV res = 4950 Hi res = 99950 Inside the box are two resistors (one loose, one soldered one end to an external terminal but not connected to the meter), values: 1 x 4950 ohms 1 x 95k ohm The meter has three terminals, two main, one smaller in the centre. The box has two connection terminals and a push-switch, which I presume was intended to select the appropriate multiplier resistor. I found an informative piece on rating by Curt Reed at http://www.antiqueradios.com/forums/...ad4ccd433b5184 (posted: Jul Wed 21, 2010 10:16 pm) If anyone knows what the central terminal is for, and can offer any advice on how the meter could be wired for 25kv operation, that would be better than my guesswork. Thank you That meter says "Calibrated at 50 ~", which says to me that it's an AC microammeter with a display in volts. Use with care. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net |
#3
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Vintage DC kilovolt meter - wiring multiplier resistors - kilovoltmeter3views.jpg (0/1)
Post it to www.instructables.com when you are done (and if you don't fry
yourself first). There are lots of 'Steam-Punk' projects there. The Jacobs ladder is typically made with an ignition transformer from an oil burning heating system. The secondary on these transformers is center tapped with the tap going to case/earth. The output current is limited by the internal core gap (iirc). Might be a lot safer since the meter will not measure KV directly, that you use a suitable scaling resistor and simply measure the mains (primary) side of the transformer. For added effect, put a filament lamp of 100W or so in series with the primary. Brightness is proportional to the current drawn and gives a further current limit control. This may not give enough power for the arc to travel up the column though. Be safe! "glutinous" wrote in message ... I have just bought a vintage (1943?) DC 25-kilovolt meter (for a Steam-Punk style 10kv Jacob's Ladder project). |
#4
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Vintage DC kilovolt meter - wiring multiplier resistors - kilovoltmeter3views.jpg (0/1)
On Fri, 3 Sep 2010 10:34:19 -0400, "Oppie"
wrote: Post it to www.instructables.com when you are done (and if you don't fry yourself first). There are lots of 'Steam-Punk' projects there. The Jacobs ladder is typically made with an ignition transformer from an oil burning heating system. The secondary on these transformers is center tapped with the tap going to case/earth. The output current is limited by the internal core gap (iirc). Might be a lot safer since the meter will not measure KV directly, that you use a suitable scaling resistor and simply measure the mains (primary) side of the transformer. For added effect, put a filament lamp of 100W or so in series with the primary. Brightness is proportional to the current drawn and gives a further current limit control. This may not give enough power for the arc to travel up the column though. Be safe! "glutinous" wrote in message .. . I have just bought a vintage (1943?) DC 25-kilovolt meter (for a Steam-Punk style 10kv Jacob's Ladder project). Thank you for the observations, Oppie. As I just replied to PeterD, the Jacob's Ladder I referred to is built and functions well, using (and I always get a childish pleasure out of saying this) a 10kv FART transformer from a neon rig. It makets a nice spark between two 30-inch copper rods, approx 2.5 inches at the wide end. In fact I already have a (low wattage) vintage industrial filament lamp fitted to the front of the box it's built into, but it's wired in parallel to the primary, and lights up when the low-voltage switching side operates a relay to supply current to the FART (he he he snurk). Anyway, I'm guessing it'd limit the juice so less spark. It's an idea to try the meter on the mains side: it doesn't _really_ have to show a genuine 10kv, it's more for the look of the thing (tho' it would be cool if it did - obviously without the frying bit). BTW, the low-voltage relay side is operated by a small, old-style, bakelite base circuit-breaker type switch (as in "throw the..."). Cheers! |
#5
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Vintage DC kilovolt meter - wiring multiplier resistors - kilovoltmeter3views.jpg (0/1)
On Thu, 02 Sep 2010 19:54:47 -0400, Phil Hobbs
wrote: glutinous wrote: I have just bought a vintage (1943?) DC 25-kilovolt meter (for a Steam-Punk style 10kv Jacob's Ladder project). It is built into a box (photograph attached). On the underside of the box someone has written: Meter res = 50 ohm LV res = 4950 Hi res = 99950 Inside the box are two resistors (one loose, one soldered one end to an external terminal but not connected to the meter), values: 1 x 4950 ohms 1 x 95k ohm The meter has three terminals, two main, one smaller in the centre. The box has two connection terminals and a push-switch, which I presume was intended to select the appropriate multiplier resistor. I found an informative piece on rating by Curt Reed at http://www.antiqueradios.com/forums/...ad4ccd433b5184 (posted: Jul Wed 21, 2010 10:16 pm) If anyone knows what the central terminal is for, and can offer any advice on how the meter could be wired for 25kv operation, that would be better than my guesswork. Thank you That meter says "Calibrated at 50 ~", which says to me that it's an AC microammeter with a display in volts. Okeydokey Phil, thank you. Use with care. That's why I posted here before doing ANYTHING! Cheers Phil Hobbs Cheers back at you. Thanks! |
#6
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Vintage DC kilovolt meter - wiring multiplier resistors - kilovoltmeter3views.jpg (0/1)
"glutinous" wrote in message
... As I just replied to PeterD, the Jacob's Ladder I referred to is built and functions well, using (and I always get a childish pleasure out of saying this) a 10kv FART transformer from a neon rig. It makets a nice spark between two 30-inch copper rods, approx 2.5 inches at the wide end. In fact I already have a (low wattage) vintage industrial filament lamp fitted to the front of the box it's built into, but it's wired in parallel to the primary, and lights up when the low-voltage switching side operates a relay to supply current to the FART (he he he snurk). Anyway, I'm guessing it'd limit the juice so less spark. It's an idea to try the meter on the mains side: it doesn't _really_ have to show a genuine 10kv, it's more for the look of the thing (tho' it would be cool if it did - obviously without the frying bit). BTW, the low-voltage relay side is operated by a small, old-style, bakelite base circuit-breaker type switch (as in "throw the..."). Cheers! Figured that 'FART transformer' had to be a UK reference. Never heard of it in the USA. http://www.signtechnology.co.nz/f.a.r.t.php Doesn't give much information about products. http://www.bigclive.com/jacobs.htm is more informative. In spite of the name, France Transformer is one of the more common sign transformers used in the USA. Sorry, no 'snurk' factor on this manufacturer. http://www.franceformer.com/index.html |
#7
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Vintage DC kilovolt meter - wiring multiplier resistors - kilovoltmeter3views.jpg (0/1)
On Sun, 5 Sep 2010 22:43:52 -0400, "Oppie" wrote:
"glutinous" wrote in message .. . As I just replied to PeterD, the Jacob's Ladder I referred to is built and functions well, using (and I always get a childish pleasure out of saying this) a 10kv FART transformer from a neon rig. It makets a nice spark between two 30-inch copper rods, approx 2.5 inches at the wide end. In fact I already have a (low wattage) vintage industrial filament lamp fitted to the front of the box it's built into, but it's wired in parallel to the primary, and lights up when the low-voltage switching side operates a relay to supply current to the FART (he he he snurk). Anyway, I'm guessing it'd limit the juice so less spark. It's an idea to try the meter on the mains side: it doesn't _really_ have to show a genuine 10kv, it's more for the look of the thing (tho' it would be cool if it did - obviously without the frying bit). BTW, the low-voltage relay side is operated by a small, old-style, bakelite base circuit-breaker type switch (as in "throw the..."). Cheers! Figured that 'FART transformer' had to be a UK reference. Never heard of it in the USA. http://www.signtechnology.co.nz/f.a.r.t.php Doesn't give much information about products. http://www.bigclive.com/jacobs.htm is more informative. In spite of the name, France Transformer is one of the more common sign transformers used in the USA. Sorry, no 'snurk' factor on this manufacturer. http://www.franceformer.com/index.html Thanks for the reply. FART GmbH is a German company, as far as I know (tho' that's Fabbrica Apparecchiature Radioelettriche Treviso). It's not all Benny Hill over here you know... :-) Website (under 'renovation'): http://www.fart-neon.de/ Some info on the transformer: http://www.signbuyer.co.uk/neon-fart...mer-2286-p.asp |
#8
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Vintage DC kilovolt meter - wiring multiplier resistors -kilovoltmeter3views.jpg (0/1)
glutinous wrote: On Sun, 5 Sep 2010 22:43:52 -0400, "Oppie" wrote: "glutinous" wrote in message .. . As I just replied to PeterD, the Jacob's Ladder I referred to is built and functions well, using (and I always get a childish pleasure out of saying this) a 10kv FART transformer from a neon rig. It makets a nice spark between two 30-inch copper rods, approx 2.5 inches at the wide end. In fact I already have a (low wattage) vintage industrial filament lamp fitted to the front of the box it's built into, but it's wired in parallel to the primary, and lights up when the low-voltage switching side operates a relay to supply current to the FART (he he he snurk). Anyway, I'm guessing it'd limit the juice so less spark. It's an idea to try the meter on the mains side: it doesn't _really_ have to show a genuine 10kv, it's more for the look of the thing (tho' it would be cool if it did - obviously without the frying bit). BTW, the low-voltage relay side is operated by a small, old-style, bakelite base circuit-breaker type switch (as in "throw the..."). Cheers! Figured that 'FART transformer' had to be a UK reference. Never heard of it in the USA. http://www.signtechnology.co.nz/f.a.r.t.php Doesn't give much information about products. http://www.bigclive.com/jacobs.htm is more informative. In spite of the name, France Transformer is one of the more common sign transformers used in the USA. Sorry, no 'snurk' factor on this manufacturer. http://www.franceformer.com/index.html Thanks for the reply. FART GmbH is a German company, as far as I know (tho' that's Fabbrica Apparecchiature Radioelettriche Treviso). It's not all Benny Hill over here you know... :-) Glow in the dark FARTs? Dimbulb will be so jealous! -- Politicians should only get paid if the budget is balanced, and there is enough left over to pay them. |
#9
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Vintage DC kilovolt meter - wiring multiplier resistors - kilovoltmeter3views.jpg (0/1)
On Sun, 12 Sep 2010 01:24:22 +0100, glutinous
wrote: [snip] FART GmbH is a German company, as far as I know (tho' that's Fabbrica Apparecchiature Radioelettriche Treviso). It's not all Benny Hill over here you know... :-) [snip] I don't know... I certainly saw a lot of ausfahrt- and einfahrt-ing when I was in Germany... as well as some other fahrt-ing that I don't know what it meant ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Democrats are best served up prepared as a hash Otherwise the dogs will refuse to eat them |
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