Doesn't one also have to consider the reactance
of the cap at a specific frequency and the result
change in possible breakdown E of the cap?
A cap with 50 ohms of reactance and 10 amps
flowing through it at 1 Mhz is going to have 500
volts across it yet the same cap at the same
current level is only going to have 50 volts acrossed
it at 10 Mhz. If the cap is rated at 500 volts it may
fail at 1 Mhz, but work fine at 10 Mhz, all other things
being reasonably equal of course.
Does that sound reasonable?
Mark WB8JKR
On Fri, 24 May 2002 16:11:44 -0500 "Phil Clements" <philk5pc@tyler.net>
writes:
> I have a mica cap. here on my desk that I use for a paper-weight.
> It is made by Captron.....5100 pf @ 3000 peak volts.
> The current ratings marked on it are:
> 9.1 amps @ 3000 khz
> 8.2 amps @ 1000 khz
> 6.2 amps @ 300 khz
> 3 amps @ 100 khz
>
> This brings up a number of questions:
>
> Is the 9.1 amps a maximum at ANY frequency above 3000 khz,
> or does it rise past 9.1 amps at higher frequencies?
>
> If it will handle more current than 9.1 amps at higher frequencies,
> will some point be reached where a maximum never-exceed
> current rating will be reached?
>
> If 9.1 amps @ 3000 khz IS the never-exceed current rating,
> does this hold at higher frequencies, or does the current
> rating start to go back down as you pass 3000 khz going up?
>
> This ought to keep a few minds busy during the long week-end!
>
> Inquiring minds want to know.......
>
> (((73)))
> Phil, K5PC
>
>
>
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> http://lists.contesting.com/mailman/listinfo/amps
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