-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Mauricio Jancic
Sent: Tuesday, September 16, 2003 3:58 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Using CMX868...


Can you please explain to me what is the difference between a "wet" and
a "dry" interface?

Thanks

Mauricio

Dry is no DC current, voice (AC) only; wet is DC current and voice (AC).

The terms are often found in discussing relay and switch contacts; some
contact designs require a small DC current (called a "wetting" current) to
break down any oxide that might have formed on the surface of the contacts
and thereby caused a high resistance connection. Running a relay or switch
with only a small signal current (microamperes only) is known as a "dry"
contact.


Jack

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