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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