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January 1999

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Subject:
From:
Jeff Finger <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 20 Jan 1999 10:18:51 -0800
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The most reliable way is to power up the circuit  and listen and watch the
cap blow a hole in the board and blind the test technician - or not.  But
seriously . . .

Another way is to use automated optical inspection, which is really only
appropriate for SMT parts, because it is harder to see the marks on radial
tantalums.

Another way is to use Genrad's Open's Express probes (or HP's test jet) on
an in-circuit test fixture overclamp.  These probes can actually detect the
polarity of a variety of small electrolytic caps and tantalum caps.  Not all
values and packages of tantalums can be reliably tested.

As far as I know, there is no reliable electrical test method to detect the
polarity of caps in production.

Jeff Finger
Manufacturability Specialist
Aimtronics Corporation


>>> Poh Kong Hui <[log in to unmask]> 01/14 6:40 AM >>>
Hi Technetters,

Is there any reliable way to detect wrong orientation on Tantalum
Capacitor?


Thanks

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