PSN-L Email List Message

Subject: Re: My first Sensor
From: John Popelish jpopelish@........
Date: Wed, 20 Sep 2006 22:41:33 -0400

tchannel wrote:

>  1 I could use some advise, if the amp and filter 
 > seem to be okay or if I have over done something.

Two open questions are the damping factor for the pendulum (how many 
cycles do you see after you blow on it, before it settles?) and does 
your amplifier provide enough gain?

> 2  Another issue is, I am overwhelmed with confusion about 
 > "Seconds vs Hz"
 > I understand how to work with them and what they mean.
 > But the more I read the more confused I get.
 > The events come in low frequencies,
 > 10 to 20seconds  is that  0.1Hz. and .05Hz?

Hertz means cycles per second.  Seconds can refer to the period of one 
cycle (as you use it, above), but it can also refer to time constant 
of a filter.  Then it refers to seconds per radian.  There are 2*pi 
radians in a cycle.

> Does that make everything above those Hz, 
 > or should I say, below those  periods unwanted?

 > You can see I need help.
> 3  Using AmaSies, what values do I set the Low pass filter,
 > and what values do I set the high pass filter,
 > for enhancing an enlarged detail trace?
 > Do I use both a low and high together.........
 > Some examples would be helpful.
> The little I have use them has just been trial and error, 
 > to get the best picture.

Someone with more experience in seismology will have to help with these.


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