[volt-nuts] Fluke 5200A instability...

[Chuck Harris]

Hi Tom,

That's an idea, but they didn't use any.  They used a lot of tantalums...
a mix of the orange drop style, and the hermetically sealed axial leaded
variety.  Some are operated disgustingly close to the voltage ratings...
and some are used in that suspicious back-to-back way of making an NP
tantalum cap.... but no aluminum electrolytics are used anywhere in the
signal paths... just tantalum, mylar, and silver mica.

But, I will look again...

As always, I found that the half dozen, or so, Mexican made electrolytics
were very bad, so they went away.  They were used in the power supply,
and to slow down some TTL gates that drive relays.

I have to wonder why a company that routinely used high quality Sprague
tantalums, and electrolytics would toss in a few of these Mexican timebombs.

-Chuck Harris

Tom Miller wrote:
> How about any aluminum electrolytics that might be used for coupling capacitors? I
> had a problem with a DC reference that had some aluminum electrolytic caps that were
> leaky and caused feedback problems.
>
> If memory holds, they were in the 10 to 30 uF range.
>
> Just a thought.
>
> Tom