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Search result for: id10=WA 0821 7001 0763 (FORTRESS) Pintu Baja 240 Bulu Rembang
| # | Post Title | Result Info | Date | User | Forum |
| Correct grounding technique for Geode seismographs | 4 Relevance | 1 year ago | Anton Yuriev | Hardware | |
| Hello, guys.I need to ask some questions about grounding technique for Geode seismographs. Current territory that we need to investigate has strong electromagnetic pollution from nearbuy high voltage power line. When using 48 to 96 geophones many channels experiencing strong EMI interference in wide spectrum. So I want to ask the forum society for some advices on the grounding technique of Geode modules. Because in documentation there is only a mention of "grounding plug" on the side of boxes. But there is no advices on how to properly ground 4 or more modules, distanced 240 meters from one another. Even more when soil has different properties along streamer line (moisture etc). On geometrics.com could not find any instructions on rightful grounding technique. Maybe there is exist some sort of special grounding schemes for large number of modules in use. As I understand the better way is to have star topology for grounding (with one common rode point for several devices) when using spreaded device system. Because in other cases ground potential for different modules will vary. Maybe I asking a silly quastion but EMI problem anyway exist on long receivers arrays. That ruins noise/signal ratio and etc. Thanks. | |||||
| Does using a magnetometer pose a health risk? | 4 Relevance | 2 years ago | Gretchen Schmauder | General Magnetometer Info | |
| The cesium used in our magnetometers is the non-radioactive elemental metal, isotope Cs 133. We employ approximately 120 to 240 micrograms of cesium metal in the sensor divided between the lamp and absorption cell. These are small glass ampules, each containing a volume of 1/32 to 1/16 of a cubic millimeter of cesium. If either or both the lamp and cell should break the cesium will instantaneously react with the air and moisture in the air to become Cs2O and/or CsOH. Both compounds are caustic but the quantity is so small that it is of no health concern. Finally, the lamp and the cell ampules are contained in a G10 housing that is then contained inside a sealed PVC housing. If the sensor should cease working due to a broken lamp and/or cell, it is not field repairable. Return the sensor to Geometrics for repair, replacement and/or disposal. | |||||
