Joe,
More data will be required before the group would be able to help with a
diagnosis. You say
that each instrument is on it's own line. Are you referring to an ac power
line? Also:
Is each instrument provided with it's own isolated ground receptacle?
Are they networked? If so, is the connection copper or optical?
Are the instruments microprocessor based?
Is there a central device (PC) controlling them?
Are all devices exhibiting these symptoms, or just a few?
Do they shut down while doing something, or when sitting idle?
I would suggest keeping a log of events, with each machine assigned a
number, in order to
create a matrix showing which machine shut down, when it shut down, what
else was
happening, etc. I understand the need to maintain confidentiality of
proprietary information,
but it should be possible to provide some generic data.
Scott Lacey
-----Original Message-----
From: [email protected] [SMTP:[email protected]]
Sent: Tuesday, September 07, 1999 5:04 PM
To: [email protected]
Cc: [email protected]
Subject: Immunity Problems ??
EMC Professionals,
We have 42 of the same instruments installed in one laboratory.
They are each
installed on their own dedicated line. On a regular basis, an
instrument will
shut down during a run. The instrument that shuts down is different
each time.
These instruments are laboratory equipment that meet Class A
radiated limits of
EN 55011
and meet the immunity requirements of EN 50082-1.
Any ideas as to the potential cause of the problem and possible ways
to resolve
the problem would be greatly appreciated.
Regards
Joe Martin
EMC/Product Safety Engineer
P.E. Biosystems
[email protected]
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