In a message dated 18/04/2006, lcochrane@.............. writes:
<=
FONT=20
style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>The=20
discussion last week about the AD7745/6 chip was rather timely. The event=20
files that I have been posting on the event file archive system with the f=
ile=20
extension of *.LCTST.PSN are from the new Volksmeter sensor. If you compar=
e=20
the LC8 channel of my S-G sensor and the new Volksmeter sensor you will se=
e=20
they are similar since they both use a short period pendulum and a=20
displacement pickup.
Hi Larry,
What period compensation are you claiming for t=
his=20
sensor?
Do the plots show a compensated velocity /=20
compensated displacement / uncompensated signal, or what?
How are you performing the velocity feedback /=20
damping necessary to stabilise the response?
I note that in your SG EMail reference, you cla=
im a=20
flat response from 50 sec to 3 Hz, but remarked that you had to substantiall=
y=20
increase the damping to get this. I note that in your latest circuit diagram=
,=20
you seem to have greatly reduced the itegration time and wondered if the cir=
cuit=20
values were correct?
Regards,
Chris Chapman