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Search result for: id10=WA 0812 2782 5310 Perusahaan Kontraktor Dry Deck Fountain Murah Pesawaran Lampung
| # | Post Title | Result Info | Date | User | Forum |
| G-882 Magnetometer will no longer communicate with a computer | 16 Relevance | 3 years ago | Gretchen Schmauder | Hardware | |
| You will need to test the magnetometer on the Dry Deck or in your shop. Connect the G882 directly to the junction box and use the black power supply Geometrics provided. Verify operation. If working go to step 4. If the magnetometer is not working, then there is a hardware failure. There is nothing that can be done in the field at this point. Arrange to send it in by requesting an RMA number from our RMA page. If the magnetometer is working then "dies" it would be useful to have the data from the "diagnostic survey". Review this document: Diagnostic Surveys for CM221 Counter Equipped Magnetometers r-2. Connect on board power supply (if different than the supply already checked) Verify operation. If it fails record Diagnostic Survey. If working proceed. Connect Deck cable (if applicable). Verify operation. If it fails record Diagnostic Survey. If working proceed. Connect Tow Cable. Verify operation. If it fails record Diagnostic Survey. If working proceed. Deploy magnetometer under normal configuration. Begin a Diagnostic Survey. If the mag doesn't work under tow then there is a problem with the tow cable/interconnections. Please take these steps and record the data when a failure occurs. (Best to record data all the time and then when it fails send the data to our Support Team, you can contact them through the support contact form. Make sure you are specific as to the conditions/configuration if/when it failed.) | |||||
| RE: Correct grounding technique for Geode seismographs | 4 Relevance | 2 years ago | Rui Zhang | Hardware | |
| Hi Anton, We are not aware of any special grounding schemes for a large number of modules. In dealing with EMI interference, our experience is that you need to individually ground each Geode - how you do it depends on the conditions you are in, but generally a Metal stake with a wire to the grounding post is the best you can do. Sometimes adding a little water to the soil around the stake can help. We have seen a majority of this type of noise occur in highly resistive environments (dry sands or hard rock), and grounding can help. If you are able to orient the lines perpendicular to the transmission lines that can also help. In general, with high voltage lines, the emanating field (50 or 60Hz) is likely coupling into the spread cable. Each geophone pair in the spread cable is a big antenna, but the pairs are twisted so any signal induce in one will also be induced (in varying degrees) into its neighboring wire. This will lead to a common mode voltage at the input to each Geode channel. So it would depend upon the common mode rejection (CMR) of the Geode’s input amplifier to reject this common mode signal. But the CMR of an amplifier is finite, and if the common mode signal is large, the common mode range of a given channel can be exceeded leading to the 50 or 60 signal being amplified by the front end differentially resulting in a lot of noise. This can happen even with very good CMR. Also any unevenness in the spread cable pair twists will result in a differential signal which will be amplified by the system. We would also suggest trying the lower gain setting, in case the front end is being over driven. You may need a bigger source to overcome the loss of amplification, but if you can get data, even with substantial 50 60z noise, a post processing 50 or 60Hz filter may be able to clean up the record enough to be useable. We haven’t tried this, but if everything else failed then this might be worth trying: It is possible that the noise is being induced in to the coils of the geophones. If that’s the case, then putting a metal can over the affected geophones might help. Note that the cans might have to be grounded with a metal stake driven into the earth. | |||||
| How difficult is it to manually tow the OhmMapper? | 4 Relevance | 3 years ago | Gretchen Schmauder | Application | |
| It is easy for a healthy, fit person to tow the OhmMapper on flat Dry ground or pavement. It is more difficult on grass or other surfaces where more friction is present. Towing the OhmMapper up hill is, of course, more difficult. The OhmMapper can be towed with a vehicle. However, a tow adaptor is required that will release the array in case a receiver cable is snagged on something in the tow path. A connector can be broken if it is snagged and towed by a vehicle but the tow adaptor is not required when it is manually towed because a person cannot exert enough force to break the connector under normal operating conditions. | |||||
