PSN-L Email List Message
Subject: Re: Got it going I think
From: BOB BARNS royb1@...........
Date: Sat, 02 Apr 2005 20:46:56 -0500
My suggestion for setting the gain is to set it for just a few counts
from the A/D on a very quiet day.
> In a message dated 02/04/2005, 1goss@........... writes:
>> I got my Lehman Seismometer up and running I think I may have my gain
>> set a bit high, But I think it is ok.
> HI Bryan,
> It looks like you have a fairly high gain on the amplifier. I
> suggest that you examine sections of the trace, do a FFT on it and check
> to see if the ~six second ocean background is dominant or if there is a
> lot of other noise. Try wedging the mass so that it can't move to check
> on instrument noise? I can't tell much from the drumplot, since I don't
> know how it was scaled. It doesn't show any waveforms or any peak
> counts. You need to click on X-Scale at the top of the display and then
> select 'counts'.
> The display shows small deflections during the night, but much
> larger ones during the 'working day'. Do you have a lot of traffic /
> industrial noise?
> What sort of suspensions / bearings are you using? A 12 sec plot
> doesn't give you much 'headroom' over the 6 sec microseisms.
> Chris Chapman
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