PSN-L Email List Message

Subject: Re: ebay auction
From: ChrisAtUpw@.......
Date: Sun, 14 Aug 2005 19:05:17 EDT


 
In a message dated 14/08/2005, royb1@........... writes:

AS1 Seismometer, Excellent Condition
Item number: 6200926939      ends Aug 20

This is  a vertical but has a rather short period.
Bob



This unit has NO electronics, so it is limited to  it's natural response of 
~1.5 sec and shorter periods.
 
    A specialised amplifier + ADC + processor is  sold with these units to 
boost the low frequency response out to about  15 sec. I don't know of an 
available circuit for DIY. If the integral knife  edge on the boom gets damaged, it 
won't work properly. 
 
    I never pay more than 50% of the cost price of a  secondhand item which 
has no warranty. 
 
    Regards,
 
    Chris Chapman
 





In a message dated 14/08/2005, royb1@........... writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000=20 size=3D2>     AS1 Seismometer, Excellent Condition
=  =20   Item number: 6200926939      ends Aug 20

This= is=20 a vertical but has a rather short period.
Bob
    This unit has NO electronics, so it is limited=20= to=20 it's natural response of ~1.5 sec and shorter periods.
 
    A specialised amplifier + ADC + processor = is=20 sold with these units to boost the low frequency response out to about=20 15 sec. I don't know of an available circuit for DIY. If the integral k= nife=20 edge on the boom gets damaged, it won't work properly.
 
    I never pay more than 50% of the cost price of=20= a=20 secondhand item which has no warranty. 
 
    Regards,
 
    Chris Chapman
 

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