>
>
>-----Original Message-----
>From: Rich Measures <measures@vc.net>
>To: itr@nanoteq.co.za <itr@nanoteq.co.za>
>Cc: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
>Date: 27 July 1999 16:29
>Subject: Re: [AMPS] equalizing resistors/caps on small HV
>power supply??
>>>Could someone please enlarge on the procedure of matching
>diodes, using
>>>simple multimeters, etc.?
>>
>>You must have a means of measuring avalanche voltage at c.
>2uA. In other
>>words, yu need a high-pot tester. . Diodes are typically
>graded into
>>drawers marked >800v, >900v, >1000v, >1100v, on and on.
>Diodes from the
>>same drawer are used to make a string.
>>- notes: I would discard any diode that has more than
>1300 piv, shows
>>an erratic piv, or exhibits an erratic forward voltage drop
>at full rated current.
>
>
>Why don't you trust 1300V+ piv?
>
They tend to have (doping) problems which are indicated by: above normal
forward v-drop or erratic avalanche voltage. Mo' is not always mo'
betta.
- cheers, Steve
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|