Seismology Instruction with the AS 1
   
Gain  This setting adjusts the amplifi cation of the signal and varies with the location 
of the seismometer.  Choose a gain setting such that the background noise is just 
visible.  For example, there is always a little bit of up and down movement of the 
trace.  A value between 25 50 is ideal.  If the trace is too noisy, adjust the gain 
to a lower value.  Any adjustment to the gain may require slight adjustments to the 
set zero level.
   
Low pass fi lter cutoff  Set to 1 Hz.  This setting fi lters out local noise from the 
school building and makes it easier to see distant earthquakes.
   
Days to retain records  This setting controls how many days are available to scroll 
back through when looking for events.  All data will be stored by the system until it is 
deleted by the user, this setting just controls how much is available to display.
   Decimate Factor  This setting controls the number of plotted points when the trace 
is redrawn, but does not affect the quality of the recording.  Set the decimate factor to  
            10.  If scrolling is very slow, adjust this setting higher to speed up scrolling.
Finding the Trace
   From the File Menu choose Settings > Set Zero Level
   Set the Zero Level at 2048 (This value centers the trace 
thus preventing clipping of the signal from a large event)  
   From the Menu Bar choose Settings > Helicorder
   
Set the Gain to 25  
   
At this point, the trace (visible wiggles) is commonly 
recording offscreen and will not be visible until 
adjusted.  The goal is to line up the trace on the
bottom (blue) hour line. To do this slowly move the 
 potentiometer (black knob  Figure 12) on the AS 1 
interface box until the trace is visible on the screen.  
Moving the potentiometer one direction will move the 
position of the trace up on the screen and the opposite 
direction will move the trace  down on the screen.  Each 
Figure 12
line represents one hour, so the trace moves slowly 
across the screen.  The current UTC time is always 
the bottom hour line (in blue).  The screen will scroll up through the day, leaving the 
trace always recording on the bottom hour line.
AmaSeis Version 1.0 Level 2005.05.19
3.4






footer




 

 

 

 

 Home | About Us | Network | Services | Support | FAQ | Control Panel | Order Online | Sitemap | Contact

 

Our web partners: Inexpensive Web Hosting Java Web Hosting personal webspace webspace php  linux webhost

 html web templates DreamweaverQuality Web Templates PSD Web Templates

cheap webhost j2ee web Hosting buy webspace ftp webspace adult webspace

frontpage WebHosting webspace hosting cheap webhost

Visionwebhosting.net Business web hosting division of Vision Web Hosting Inc.. All rights reserved

earthlink web hosting