Seismographs Other instrumentation
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HSE Misc. Click to see photos Håkon Mosby contact info Bridge: |
AIRGUN CONTROLLER (GUNCO)Airgun Controller Closure signals on two inputs (BNC) will fire the GUNCO. Time Break output available on two output BNCs; one (denoted "FTB Recording") is configurable via jumper plug on OEP-Board, the other (denoted "FTP Scope") is TTL, active low, of 10 ms duration (can be changed via GUNCO menus). GUNCO timing diagram. Note: Delay between Closure and Fire leading edge (600 ms shown) is conservative, can probably be reduced to 250 ms. This picture shows the main GUNCO display. Section with rectangles has color coded status for each of eight possible guns; black=disabled, green=ok, yellow=timing error. The GUNCO aims to have all guns fire at exactly the same moment - at zero in the timeline shown to the right, where signal from pressure sensor within each gun is displayed. The fifth gun deviates from target time by 2.5 ms. |