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From: Boris Mohar
Subject: Re: Strange failure mode in switchmode power supplies: Followup
References: <email@example.com> <firstname.lastname@example.org> <email@example.com>
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Date: Mon, 23 Sep 2002 09:46:48 -0400
NNTP-Posting-Date: Mon, 23 Sep 2002 09:47:29 EDT
Organization: Bell Sympatico
On Mon, 23 Sep 2002 04:50:13 -0000, firstname.lastname@example.org (Peter
>Boris Mohar writes:
>>>Sorry to keep harping on about this bit, but wouldn't the ferroresonant
>>>transformer clean up anything like this? That is, it'd isolate the equipment
>>>from any line conditions of the kind being discussed, ruling out a lot of the
>>>potential problem areas. I realise it's not a silver bullet, but I got it in
>>>the hope that I could at least count out the majority of possible problem
>>Did you try without the ferroresonant transformer?
>Yup, tried it with and without to see whether there was any change (nope,
>none) - this is why I was assuming it wouldn't be any of the more obvious
>causes, because the performance was identical with and without the ferro
>between the affected gear and the power source.
>>I had some nasty interactions between the UPS unit (APC make) and the
>>ferroresonant transformer. It would refuse to start up every time.
>Oh good, I'm about to test an APC UPS :-). Actually I had no problems with
>some sacrificial PCs and an older (IPT) UPS.
My APC was Back-UPS 250.
Could there be a leaky microwave oven nearby? Is there industrial area
nearby that might be using microwaves for materials processing?
Take a AC voltmeter and connect one end to water pipe ground and other
end to AC ground. Ther should be no significant differential. Connect
the same voltmeter between different outlet grounds. Ther should be no
Viatrack Printed Circuit Designs
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