Re: [TCML] microwave oven caps

[Scott Bogard <teslas-intern@xxxxxxxxxxx>]

Jim,
     I don't really know how to measure their apparent resistance, and I 
should mention they will be in parallel with a larger 80 nf maxwell.  
I'll find a box to protect myself and hope for the best I guess!

Scott Bogard.

Jim Lux wrote:
> Scott Bogard wrote:
>> Hey all,
>>      How long can I expect microwave oven caps to last in TC 
>> service.  I am planning on using 20 in series for 40 kV 50nf rating 
>> for an experiment (not long runs, unless it works really well and I 
>> get carried away of course, you all know how that is.)  Just curious, 
>> I don't want to waste them all for a few second run.
>
> They're mylar dielectric, typically, and pretty lossy.  Fine in DC 
> filter duty, terrible for RF.  They may not last long at all if you're 
> using them as your primary tank cap.
>
> have you got a way to measure their (apparent) resistance at 100 kHz?
>
> Then you could figure out what the power dissipation will be, and if 
> they're dissipating more than, say, a watt or two, they'll probably 
> overheat in short order.
>
>
>>
>> Scott Bogard.
>> P.S.  I am using them on a 4 MOT stack so about 8 kV RMS.  Fres is 98 
>> ish kHz.
>>
>
>
> Jim
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