RECORDING SYSTEM
⚠ (:toc:)
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!SEISMIC RECORDER
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Attach:geode.png"Geometrics GEODE"<br />''Geometrics GEODE''
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* %newwin%[[http://www.geometrics.com/geometrics-products/seismographs/geode/ | Geometerics GEODE]]<br />Link to %newwin%[[ftp://geom.geometrics.com/pub/seismic/Manuals/GeodeNZES-3000ManualRevK4.pdf | manual (PDF format).]]
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!RECORDING PC
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!!Primary system
* Dell desktop PC
* OS: MS Vista
* 1 TByte disk
* LAN dedicated to GEODE communication, WLAN (via USB adapter) to internet.
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!!Backup system:
* Lenovo ThinkPad X300:
** Supplier: http://www.komplett.no
** Supplier P/N: %newwin%[[http://www.komplett.no/k/ki.aspx?sku=347170 | 347170]]
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* Universal 12 Vdc Car Notebook Adapter:
** Supplier: http://www.komplett.no
** Supplier P/N: %newwin%[[http://www.komplett.no/k/ki.aspx?sku=359860 | 359860]]
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!DATA STORAGE REQUIREMENTS
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'''Assumptions:'''
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* No. of seismic channels: 96 ea
* Sampling frequency: 500 Hz
* Bytes per sample: 4 ea
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'''Calculations:'''
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(:table border=1 cellpadding=5 cellspacing=0:)
(:cellnr:) Second
(:cell:) 192.0 Kbyte
(:cellnr:) Hour
(:cell:) 691.2 Mbyte
(:cellnr:) 24 hours
(:cell:) 16.6 Gbyte
(:cellnr:) 1 week
(:cell:) 116.1 GByte
(:cellnr:) 2 weeks
(:cell:) 232.2 GByte
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NOTE: "Megabyte" = 1000'^2^' bytes. No data compression.
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These calculations from [[Attach:Svalbard-2010-snowstreamer-data-storage-requirements.xls | Excel worksheet]].
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!DATA BACKUP
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* Two 500 GByte USB harddisks
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!CONTINUOUS RECORDING (CR)
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!!Geode Configuration document
* Attach:ContinuousRecordingSetup_080507.pdf
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In CR mode data is stored in blocks of a certain duration, denoted T seconds (we will use 20 seconds).
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To achieve accurate triggering we designed and built a [[Main/TimeTriggerUnit | Time Trigger Unit]].
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!TESTING
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!!15 December 2009
* "Sending Shot Data in Progress" - duration:
** 20 sec recording, 2 ms sample interval -> 8.5 sec data transmission
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!!20 November 2009 - Can we have data recording overlap?
We want continuous recording, and need to determine if the GEODE recording can accomplish this without purchase of add-on software module from the manufacturer. A simple test is to set recording duration slightly longer than trigger interval. One could imagine internal memory buffers of GEODES permitting this special operation mode.
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* 6.0 seconds trigger interval (external signal generator)
* 6.1 seconds GEODE recording duration
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%red%'''CONCLUSION: The GEODE recording software ignores trigger signals that arrives before previous recording is completeted.'''
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Attach:geode-testing-20nov2009.png<br />''6.0 seond trigger interval, 6.1 second recording duration - yields a record every 12.0 seconds.''
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Attach:geode-testing-20nov2010.png
