[time-nuts] Bad capacitors (was Volt-nuts cooperation?)

Francesco Ledda frledda at verizon.net
Sun Jun 21 12:58:07 EDT 2009


I believe you.  You know that its is better to be lucky than smart ;)

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
Behalf Of Mark Sims
Sent: Sunday, June 21, 2009 11:22 AM
To: time-nuts at febo.com
Subject: [time-nuts] Bad capacitors (was Volt-nuts cooperation?)



The problems I saw were mostly hard failures in the caps (opens/shorts/etc).
These were in both power caps and signal caps.

One lot that I saw was a group of 12 Mettler scales.  6 were used daily and
6 were never used backup units.  When the company shut down the operations
that used the scales,  they were sold.  All the used units worked fine.  The
backup units all had capacitor problems.

I also bought a lot of new-in-box Tektronix TM500 modules.  Most wound up
having flakey capacitors.  BTW,  EVERY (new or used)  Tek  PG505 pulse
generator you will come across will have bad power supply filter caps...
unless they were replaced.


----------------------------------------


Does this happen even if the electrolytics are reformed before use?
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