PSN-L Email List Message
Subject: RE: spike problem
From: "Timothy Carpenter" geodynamics@.......
Date: Mon, 5 Jun 2006 16:43:46 -0400
J=F3n,
Probably not. If the cable was bad then it is unlikely that you'd get =
such a
close match for the three channels.
Have you attached the cable shield to the acquisition board's ground? It
must be grounded at the board (not on a water pipe).
I'm presuming that you have a six-conductor cable with a foil shield and =
a
shield ground wire. That would look like this:
/--\shield shield /--\
Geophone 1 + ---/----\------- ---/----\------- Board Ch1 +
Geophone 1 - ---|-----|------ ---|-----|------ Board Ch1 -
| | | |
Geophone 2 + ---|-----|------- ---|-----|------- Board Ch2 +
Geophone 2 - ---|-----|------- ---|-----|------- Board Ch2 -
| | | |
Geophone 3 + ---|-----|------ ---|-----|------ Board Ch3 +
Geophone 3 - ---\----/------- ---\----/------- Board Ch3 -=20
unconnected---\--/ \--/---Shield wire--- Board =
Ground
shield wire
-Tim-
Timothy Carpenter
5043 Whitlow Court
Commerce Township, Michigan 48382
geodynamics@....... (secondary)
-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Monday, June 05, 2006 4:17 PM
To: psn-l@..............
Subject: Re: spike problem
Hi
Is it possibe that this spike problems is becose of the cable that I am
using ?
I am considering buying rc type cable (stero type) type of cable in
order to test this proberly.
Regards.
--=20
J=F3n Fr=EDmann
http://www.jonfr.com
http://www.simnet.is/jonfr500/earthquake/
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