Technically, we refer to them as PCB CAD engineers.
I omitted part of that, given the fact that it seemed redundant -
PCB's being the topic of discussion. I now return you back
to your job as Keyboard Engineer.
Stephen
At 11:59 AM 3/7/2002, Robert Wilson wrote:
As a side issue to your comments, I find it interesting that you refer to
a PCB designer as a CAD engineer . Does this mean that 20 years ago he
would have been a Drafting Board engineer ? :)
Kind of sad when the tool one uses is deemed to be more important than the
job one is doing!
Bob Wilson
TIR Systems Ltd.
Vancouver.
-----Original Message-----
From: Stephen Phillips [mailto:step...@cisco.com]
Sent: March 6, 2002 9:49 AM
To: Alex McNeil
Cc: emc-p...@majordomo.ieee.org
Subject: Re: EMC and Safety PCB Reviews
Alex,
Not really a thorough checklist per se, but for Safety -
roughly this:
Throughout this process, I prefer to make notes on
paper doc's, and then sit with the CAD engineer to go
over the review on his computer screen and make any
changes right then.
- Schematic review (identify and mark up areas such as
exceeding SELV and TNV, identify critical nets).
- Provide Creepage & Clearance guidelines to PCB CAD
engineer (who inputs into the CAD system, based on
properties assigned to the nets via the schematic).
- Placement Review (using marked up silk-screen or
assy. dwg based on previously marked up schematics),
and also layer stack-up review at this time.
- Layout review, layer by layer routing, and adjacent layer
to layer.
- Layout review with mechanical dwg superimposed
(since sheet metal could violate C&C to the PCB).
- Thieving review (since thieving could violate C&C).
- Photo Artwork review (especially planes).
- Also make sure the drawings tell the PCB fab. vendor
not to put their logo smack in that nice clearing which
is your C&C!
Obviously I left out a lot of the detail as to what we
design for and what we specifically look for, but these
are the higher granularity steps I routinely take. EMC
would take more or less the same steps, just with
different criteria.
I hope this helps,
Stephen
At 09:46 AM 3/6/2002, you wrote:
Hi Guys,
I am being asked to review PCB's for EMC (and Safety) acceptance. I was
going to try and collate a check list then I thought of this wonderful
forum!!
Does any kind person have such a thing as an EMC PCB Design Check list?
Does any kind person have such a thing as an Safety PCB Design Check list?
Kind Regards
Alex McNeil
Principal Engineer
Tel: +44 (0)131 479 8375
Fax: +44 (0)131 479 8321
email: alex.mcn...@ingenicofortronic.com
