My suggestion to you is to contact UL and talk with one of their experts
that
performs this kind of tests.

We were in similar situation few months ago and found the (specific) sales
person and
engineer very understanding and helpful.

If you don't have UL in your area, try to talk with the certification body
that
will eventually will test and certify your product. The closer you get to
the person
that will actually test your equipment, the more accurate interpretation you
will have.

Tal

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tony Pan
> Sent: Monday, May 06, 2002 10:16 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: What is Testing Pattern for input
>
>
> Hi,
>
> The software that I write needs to comply with the UL1998 Standard. The
> Standard requires us do a "testing pattern for input" to migitate
> microelectronic input failure. The definition for "testing pattern" as as
> the following:
>
> Testing pattern denotes a fault/error control technique used for periodic
> testing of input units, output units and interfaces of the control. A test
> pattern is introduced to the unit and the results are compared to expected
> values. Mutually independent means for introducing the test pattern and
> evaluating the results are used. The test pattern is constructed so as not
> to influence the correct operation of the control.
>
> After reading this, I still don't understand what it is. Can
> someone explain
> to me this technique (or techniques)?
>
> Thank you!
>
> Tony Pan
>
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>
>

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