Re: Ragowski(sp?) coils

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

Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>

Hi Dave, Bert, All,

Richard also ended up just getting a current monitor (CT) from Pearson.  I am
looking at the #4997.  0.5Hz to 20MHz, 150ARMS, 20000A peak, and 0.01A/V.  It
would be perfect for everything I need in this range!  However the $800 price
tag will take some thought $:-| 

Cheers,

        Terry


At 07:04 PM 1/2/2001 -0500, you wrote: 
>
> 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----------------->
>