Re: Ragowski(sp?) coils

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-uswest-dot-net>" <sccr4us-at-erols-dot-com>

Hi Bert 

Tesla list wrote: 
>
> Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <bert.hickman-at-aquila-dot-net> 
>
> Hi Dave, 
>
> Thanks for providing some more detail - I remember Richard discussing 
> this a while back, but this provides more missing info. Did he build his 
> own integrator with a high slew rate integrator? Calibration for very 
> high currents was done via comparison with calculated peak currents for 
> high-current discharge with known L and C and attenuators on output? I 
> was looking at buying a high current one (100 kA), but the cost was 
> almost $1k for the coil and battery powered integrator module, so I 
> opted to use a Current Viewing Resistor (CVR) instead... 
>  

---------------------SNIP-------------------------------- 
Richard likewise used a CVR.  The distributed R idea was published in an 
article on RC's in Power Conversion & Intelligent Motion (PCIM) Trade 
Magazine about 2-3 years ago.  A flexible RC is made by somebody 
(I believe the firm is in the UK), with integral op amp filtering.  The unit 
was flexible similar to a "clip-on" ammeter, to allow temporary mounting 
around bus bars on VSD's, traction drives, etc. 

Good hearing from you Bert! 
Regards 
Dave Sharpe , TCBOR 
Chesterfield, VA. USA 
>
>   
> Happy New Year to you! 
>
> -- Bert -- 
> -- 
> Bert Hickman 
> Stoneridge Engineering 
> Email:    bert.hickman-at-aquila-dot-net 
> Web Site: <http://www.teslamania-dot-com>http://www.teslamania-dot-com
>   
> <--------SNIP----------------->