[Milsurplus] not a capacitor

[bcarling@cfl.rr.com]

Finally.  A well-deserved expose on the RF characteristics if many disc ceramic caps. 

Bry Carling
http://www.af4k.com
http://alltheaboveband.com


----- Reply message -----
From: "elden meyer" <elden_meyer at yahoo.com>
To: "milsurplus at mailman.qth.net" <milsurplus at mailman.qth.net>
Subject: [Milsurplus] not a capacitor
Date: Tue, Apr 30, 2013 1:59 pm


At several of my jobs we have had troubles with performing AC hi-pot
tests on equipment using ceramic disc capacitors as line to ground filters.
They often have a horrible voltage coefficient of capacitance. At power
frequencies the resulting high peak current either trips the current limit
on the tester or sets up resonance effects with power limited (neon sign
type) HV transformers to produce ugly waveforms and destructive voltage
peaks. They pass a DC test with no problems at full rated voltage.
 
They should make nifty harmonic generators at RF.
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