[PCB_FORUM] Re: Schematic drafting practices

Just out of curiosity, what about field service guys who may not have ready 
access to online (on-disc) .pdf files?  Having all information available in the 
schematic as either a table or explicit pinouts seems critical for field 
service activities.

(Grated, my viewpoint is from that of a medical capital equipment manufacturer 
with a field service force, not a manufacturer of consumer goods that are 
throwaways and never "fixed" in the normal sense.)

/s/jar (Alan Ritter, alan.ritter@xxxxxxxxxx)
        http://www.mtritter.org
 

Just a few comments from my side of the world. I have to use my own
schematics in the lab as I am the EE who is forced to use his own work
(schematics, layouts, silkscreen!!, documentation).  I *never* use the
power/ground table nor do I use the individual pinned out symbols -- in the
case where the symbol is huge (FPGA, processor).  I use PDF!  I hotlink
everything in the lab to PDF now and have monitors around where online data
(local, www) is at your fingertips.  When using OrCAD, the P/G for large
symbols is placed as its own part with individual pins.  In Concept, the
hidden P/G through size is used with and without the table. Tables are no
longer generated as we find they are a waste of time. For small analog
parts, the VCC/GND pins are individually instantiated.

Over the last 25 yrs I have seen schematics change from draftsman-drawn
blueprints to modern CAD schematics.  I know what *hands-on* guys are using
in the lab.  I've managed labs. I've debugged.  I've layed out.  I've built
symbols.  Power and Ground needs to be your company philosophy -- but don't
force something on someone until YOU'VE used your own documentation RULES
and learned the pros and cons of the rules.

BD





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