[time-nuts] Bad capacitors (was Volt-nuts cooperation?)
dave.mallery at gmail.com
Sun Jun 21 18:12:35 EDT 2009
many thanks for the heads-up on the pg505 caps!
they are supposed to be 350 ufd at 75 vdc. they are anything but.
(goes back to mixing/matching caps...)
On Sun, Jun 21, 2009 at 10:21 AM, Mark Sims <holrum at hotmail.com> wrote:
> 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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Dave Mallery, K5EN (ubuntu linux 9.04)
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