Hi Larry,
 
    The  _New Manual of  Seismological Observatory Practice_ 
(http://www.seismo.com/msop/nmsop/nmsop.html)  Updated version of the link above. and  
_Instrumentation  in Earthquake Seismology_ 
(http://www.geo.uib.no/seismo/SOFTWARE/DOCUMENTATION/instrument.pdf)  (pdf file) by Jens Havskov and Gerardo Alguacil. 
     are both showing as 'missing links'.
 
    Have you managed to measure the filter delays in  your amplifier boards 
yet, please?
 
    Regards,
 
    Chris Chapman





Hi Larry,
 
    The=20
New Manual of=20
Seismological Observatory Practice Updated version of the link above. an=
d=20

=
Instrumentation=20
in Earthquake Seismology (pdf file) by Jens Havskov and Gerardo Alguacil=
..=20

     are both showing as 'missing links'.
 
    Have you managed to measure the filter delays i=
n=20
your amplifier boards yet, please?
 
    Regards,
 
    Chris Chapman