7 Oct
2010
7 Oct
'10
8:27 p.m.
On 10/07/2010 03:37 PM, William Donzelli wrote:
Could you confirm that the failures were due to not
being able to
reform, rather than another failure mode?
We didn't attempt any failure
analysis. Our reformation procedure
involved computing a current limit at voltage steps of 0.5V each. If at
any given step, the leakage current of the capacitor didn't drop below a
reasonable level after an extended period (perhaps 12 hours), we
considered the capacitor to need replacement.
IIRC, most of the ones that failed never dropped to a reasonable leakage
current even at a fairly low voltage.
Eric