In a message dated 19/01/2008, PETERS_RD@.......... writes:

A paper  has been posted at 
_http://physics.mercer.edu/hpage/mouse-sensor.pdf_ (http://physics.mercer.edu/hpage/mouse-sensor.pdf) 



Hi Randall,
 
    The AD698 LVDT chip is not suitable for use with  seismometers. Apart 
from being hideously expensive, it is also quite noisy. You  can't get the very 
high resolution required. 
 
    Single channel 16 bit Sigma Delta ADC chips start  from about $5, not 
$25. The Linear ones seem to work fine.
 
    Regards,
 
    Chris



   






In a message dated 19/01/2008, PETERS_RD@.......... writes:
<=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>A paper=20
  has been posted at http://physics.m=
ercer.edu/hpage/mouse-sensor.pdf


Hi Randall,
 
    The AD698 LVDT chip is not suitable for use wit=
h=20
seismometers. Apart from being hideously expensive, it is also quite noisy.=20=
You=20
can't get the very high resolution required. 
 
    Single channel 16 bit Sigma Delta ADC chips sta=
rt=20
from about $5, not $25. The Linear ones seem to work fine.
 
    Regards,
 
    Chris