analog/digital signals 2

[notredave]

If I'm posting in the wrong forum, please let me know the correct forum to post in.
I'm confused with signals in general. What can tell me if a signal is to be analog in or analog out/digital in or digital out? If anybody knows of an "Instrumentation for dummies", let me know.

Thank you

 

[mikek10]

Digital is on or off only

Analogue has infinite variation

Input is something coming in

Output is going out

 

[danw2]

The Measurement & Control Instrumentation Engineering forum

http://www.eng-tips.com/threadminder.cfm?pid=698

also addresses instrumentation.

There are probably 20 - 30 overviews or text books on instrumentation in print.

ISA is instrumentation's trade organization at, they publish and sell books on instrumentation.

http://www.isa.org/Template.cfm?Section=Books3&Template=/customsource/isa/StoreIntro/books.cfm

George Platt's Process Control: A Primer for the Nonspecialist and the Newcomer is what the title suggests. The 1998 edition is current. Half.com has one for $0.75 plus shipping.

Dan