In a message dated 13/06/2007, jonfr@......... writes:

Any  ideas why I might not have recorded the Mw 6.9 earthquake on my test
lehman  sensor. Besides the obvious flaws in it.



Hi Jon,
 
    What period is it set at? Put some marker at the  end of the boom, push 
it 10 mm to one side and time the intervals between  complete oscillation 
cycles. If it does not have any damping, it should swing  freely.
 
    What sort of suspensions have you used?
 
    Regards,
 
    Chris Chapman



   






In a message dated 13/06/2007, jonfr@......... writes:
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=3D2>Any=20
  ideas why I might not have recorded the Mw 6.9 earthquake on my test
le=
hman=20
  sensor. Besides the obvious flaws in it.


Hi Jon,
 
    What period is it set at? Put some marker at th=
e=20
end of the boom, push it 10 mm to one side and time the intervals between=20
complete oscillation cycles. If it does not have any damping, it should swin=
g=20
freely.
 
    What sort of suspensions have you used?
 
    Regards,
 
    Chris Chapman