At 08:03 AM 3/8/99 PST, Bailin Ma wrote:
>Hi Group,
>
>We have already seen awards for the most misleading ads, worst attire,
>worst films, .....
>Why not awards for worst EMC and PS qualities?
>
>Barry Ma
>Morgan Hill, CA 95037
For power supply disasters, I had a -48vdc telco
product at an unnamed lab being safety tested.
The power input was a terminal block on the back
clearly stating the following over the only two
screws for hookup.
48VDC
+ -
A grounding connection for frame ground was available
but was well away from the terminal block.
I got a call from the test "engineer" of the lab
telling me that he had hooked everything up and
"just wanted to check he'd done everything alright."
Something didn't sound right about his power hookup.
So, I had him describe exactly what he had done.
He had hooked up a "minus 48 volt supply" to the
"minus terminal", a "plus 48 volt supply" to the
"plus terminal", connected return for both power
supplies to the frame ground connection and was
just about to turn on both DC supplies. After
confirming that he could indeed add 48 and 48,
I drove to the lab.
Testing went quickly downhill after that.
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