--- Message Board --
[ Post your Response | --- Message Board -- ]

Re: High Voltage Transformer

Posted by Bert Hickman on 3/26/2007, 11:56 pm, in reply to "Re: High Voltage Transformer"
67.173.43.62

 --Previous Message--: One last question for anyone who might know about these 70kv / 100kv : transformers from x-ray units.. This 70kv unit I have here; does this : thing actually put out 70kv, or is that the rating after the diode : rectifier?? I have no way of directly measuring these insanely high : voltages, but with 60vac measured directly across the primary connections : (using a resistive ballast) I can draw an arc about three inches long. : Theoretically, that would be approximately 35kv (assuming 120vac gives the : full 70kv) - and assuming of course the physical winding ratio is really : 583:1!! Are these things really capable of 70kv (or 100kv)? Does there : exist a xfrmr that really put out 100kv?? I seem to be getting mixed : messages on the internet about this. Thanks again! -Wes. :Hi Wes,Unlike most transformers (that are rated in RMS volts), X-ray transformers are rated for peak volts at a given current load. This is because the peak voltage rating reflects the maximum energy of the x-rays that can be created (which, in turn, determines penetrating power of the resulting x-rays). The peak output voltage is independent of whether the output is rectified or filtered (unless a voltage doubling circuit is used). Rectification (with no capacitive filtering) will improve the duty cycle and thus the total x-ray power available. Adding a filter capacitor will reduce the "spread" between maximum and minimum x-ray energies, but again will not increase peak voltage.The distance an arc will jump is really not a very good measure of voltage, since the distance you can stretch an arc is strongly dependent on the amount of available current. Heck, you can even stretch a high current low voltage welding arc for an inch or two. The distance that a spark will initially jump between identical spheres is a considerably more accurate way to roughly measure peak output voltage. Here's a table that you may find useful:http://home.earthlink.net/~jimlux/hv/spherev.htm Good luck and please remember to PLAY SAFELY - X-ray transformers can be VERY nasty! Bert

 Message Thread High Voltage Transformer - Phil Makotyn 9/26/2003, 4:25 pm Re: High Voltage Transformer - Wes Martin 3/17/2007, 6:09 pm Re: High Voltage Transformer - Bert Hickman 3/17/2007, 6:52 pm Re: High Voltage Transformer - Wes Martin 3/26/2007, 10:43 pm Re: High Voltage Transformer - Bert Hickman 3/26/2007, 11:56 pm Re: High Voltage Transformer - Wes Martin 3/27/2007, 8:20 pm Re: High Voltage Transformer - Wes Martin 3/17/2007, 9:27 pm Re: High Voltage Transformer - Wes Martin 3/17/2007, 9:19 pm Re: High Voltage Transformer - Bert Hickman 9/27/2003, 8:16 am « Back to index

This web site is maintained by Bert Hickman. � 1999-2012, All rights reserved. No portion of this web site may be reproduced without written consent.