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| # | Post Title | Result Info | Date | User | Forum |
| Why does it take so long for my MagArrow GPS to lock? | 6 Relevance | 2 years ago | Rui Zhang | Hardware | |
| 1. Make sure the MagArrow top cover (the curved side) is facing up and under a clear sky. 2. It may take up to 20 minutes for the GPS to lock during the initial power up. Afterwards, the GPS stores the location information for a while (~40 minutes for MagArrow I and ~ 2 hours for MagArrow II) without the power so that it can lock much faster than 20 minutes (~2-3minutes) during subsequent powerups. 3. If the powerup locking time is significantly Longer or intermittent GPS dropouts are observed during flight: MagArrow I will need to be sent back to Geometrics for repair. MagArrow II customers may choose to unscrew the external helical antenna (or attach the external helical antenna) and check whether the Longer-than-normal locking time or the intermittent issue goes away. MagArrow II has an independent internal and external antenna design. When the external helical antenna is attached (unattached), the system switches to the external (internal) antenna automatically. | |||||
| Why you Need a Magnetometer Base Station | 3 Relevance | 2 years ago | Gretchen Schmauder | Application | |
| Your need of a magnetometer base station like the G-862RBS depends on the objective of the survey. If one is performing a geologic survey to investigate deep structure (exploration for mineral deposits, oil/gas, geology) then the wavelengths of the "target" body are typically “long” (long in meters, therefore Long in data acquisition time). The rate at which the Earth's natural magnetic field responds to interaction with the solar wind is also typically many seconds to minutes (diurnal variations). Since the geologic and diurnal variations are of similar wavelengths, a geologic mag survey usually requires a base station. Please read the introductory sections of the Applications Manual for Portable Magnetometers offered on our website for more details. If you are moving fast (fast in the sense of a brisk walk, ~1m/s) and looking for small targets (UXO, archaeological artifacts, environmental targets like drums, pipes, etc.) then you are “up and over” them in a matter of seconds and typically the earth’s field does not change in this time frame. So there is less need for a base station for these type surveys. Of course, it never hurts to have a base station running and if you are surveying over multiple days, having a reference station will allow easier “block leveling” of multiple day surveys. | |||||
| Basic Troubleshooting Techniques for OhmMapper | 3 Relevance | 2 years ago | Gretchen Schmauder | Application | |
| 1. When the transmitter is turned on, the red power light (or green light in later versions) comes on and stays on. The blue light will go into a rapid flashing pattern then settles into a three-flash sequence, for example short-long-short or short-long-long, or something like that. Is that what the transmitter is doing? If not, there are three possible causes of the problem and this will require require swapping parts: Defective dipole cable or shorting plugs are two potential problems. The best test is to plug the shorting plugs directly into both ends of the Transmitter and turn on. If this works, then add one dipole cable and turn on again. Then add the second cable and power up. If failure occurs with just the shorting plugs then the most likely problem is a battery with a shorted internal cell. This will look like it is fully charged when you measure it with a volt meter, but will not be able to supply the current required to drive the transmitter. Swap out batteries to test. If swapping the batteries does not resolve the issue and you never get the blue light to start flashing you may have a bad Tx and it would need to be returned to Geometrics. 2. When the receiver is turned on the red power light will come on, then the blue light will flash rapidly, then the blue light will turn off waiting for the receiver to phase lock onto the Tx. Once it locks onto the transmitter the blue light will start flashing at once per measurement. Depending on how conductive the ground is and how far apart the Tx/Rx separation is you may have to wait up to a minute to get the lock. Try it with about a 5 meter separation between the end of the dipoles, i.e. the equivalent to having a 5-meter rope between them. The Rx should lock and start flashing within about 20 seconds. If it never locks on even though the Tx's blue light is flashing then there may be something wrong with the receiver and it would need to be sent back. Remember that the transmitter blue light has to be flashing first. If the Tx is not working the Rx will never detect it and start flashing. 3. With the Rx turned on, even if the blue light is not flashing, when you look at the OhmMapper Test screen on the console do you see the message: Setting Gain, Phase A, Phase B or something similar being updated on the screen every second (or twice per second with the old systems)? If so your console is communicating with the receiver. If not, you have no communication between the Rx and the console so you could have a bad dipole cable, bad optical wand, bad console cable, or a bad receiver. If you have spares of any of these items you can troubleshoot the problem. If you have no spares then you will need to send the system back here for evaluation by submitting an RMA request. | |||||
| File Cleanup Utility | 2 Relevance | 11 months ago | Magnetics SW | General Magnetometer Info | |
| Some of the Geometrics magnetometers include a feature, called the "File Cleanup Utility", that removes files that are no Longer useful from storage on the instrument. The feature's accessible from the "Support" link in the Settings page in MagNav. You might be reading this post because that page directed you to read this post before using the utility. [This feature is not the same as the feature in MagNav to delete all of a survey's data. That feature removes information only from the database on the Android tablet, and doesn't remove any data in the instrument]. How do I use this feature? If this is the first time you've used this feature, please read the rest of this post before proceeding. Make sure that you're connected via WiFi to the instrument Go to the Settings page in MagNav Select the "Support" link. If your instrument supports this feature, the support page will include a link to "Delete project storage". Tap it. You should see a list of projects, with a name and a "Delete project" button for each project. This feature cleans up the data for all of the surveys in a project. Delete any projects for which you don't want to keep the in-instrument data. You can delete the data for all of the projects that you see, but there's no harm in leaving the files for projects that you're still using. Some projects will show a name similar to this: [c3bd]. These are early projects, in which the user-assigned name was not used in the instrument storage. It's OK to remove the data for these projects. Why do I need to do this? The magnetometers that use MagNav first store data on the instrument, and then sync (or download) the data to MagNav. Some instruments, for which this technical approach makes the instrument more reliable - MagEx, e.g. - do this automatically. Other instruments, such as those that allow disconnected acquisition (e.g. MagStation), store the data until the user re-connects to the instrument and manually starts the sync process. The data stored in the instrument is not of any use once it's been downloaded, but because deletion is slow and for other technical reasons, it's left on the file system in the instrument. As it accumulates, it could eventually interfere with the performance of the instrument and should therefore be deleted. Will this delete any data in the database in MagNav? No, this feature doesn't remove or change any data in the database in MagNav. When should I use this feature? Here are a few guidelines: Run this utility after deleting an entire project. Run this utility after completing a Long field survey. Run this utility while doing other instrument maintenance. Run this utility after you've collected "a lot" of data. Run this utility when you have the impression that the instrument is unresponsive or is behaving sluggishly. Will anything bad happen if I forget to do this? Probably not any time soon; the storage systems on the instrument are large and quite efficient. Geometrics tests instruments with amounts of data consistent with several years of regular use, and which show no performance issues relating to file storage performance. But don't let it go forever; follow the guidelines above. Can I delete data for projects that I'm still using? Yes, you can, as Long as the data has already been synced to the instrument (that happens manually with MagStation and automatically with the other instruments). Once the data has been synced and is visible in MagNav, its presence in the instrument storage is no Longer needed. | |||||
| What are the functional limits of a trigger extension cable? | 2 Relevance | 2 years ago | Gretchen Schmauder | Hardware | |
| How Long can a trigger extension cable be and still function to trigger a seismograph? In the past our engineers have tested trigger lines up to 1 Km without any noted latency issues. That was done with the standard RJ-58 Coax cable. It is possible that it may work at distances Longer, but we would recommend testing it above ground before field deployment. We do have a Trigger Noise Filter, connected in-line with (long) trigger cables to suppress false triggering. Contact us for more information. | |||||
| Use and Care of G-857/G-858/G-859 Batteries | 2 Relevance | 2 years ago | Gretchen Schmauder | Hardware | |
| The batteries used in the portable magnetometer instruments are lead-acid gelled electrolyte batteries. The choice of this type of battery was dictated by their non-magnetic internal construction. We “magnetically compensate” these batteries to further reduce their magnetic signature. We do this with bucking coils which are mounted against the battery surfaces and then an external wrap applied. The batteries should be charged using the charger furnished with the instrument. These chargers are fully automatic and designed to do the best job of charging and maintaining the batteries for Long life. All of the chargers are equipped with lights indicating when the battery is being charged and when the charging cycle is completed. The battery packs will provide the most operating cycles when they are fully charged after each use. The number of operating cycles can vary from 250 cycles to above 1000 cycles depending on how deep the discharge was and how soon the battery is charged after use. A 30% discharge per cycle may result in a lifetime of 1000 cycles or more, whereas a 100% discharge per cycle can result in only 250 cycles. As a rule the magnetometer will shut down when the battery is discharged to about 20% of full voltage. This is to ensure proper shutdown of the instrument. It is very important to recharge the battery as soon as possible after use so the maximum life can be expected from the pack. If the discharged pack is left to charge “when we get back from the field” the pack can suffer from “sulphation”. This is a high-resistance buildup in the battery which may render the battery unusable. If a battery of this type must be stored for an extended period, it must be stored in a fully-charged condition. If such a battery is stored discharged and subject to below-freezing conditions, it is likely to freeze and be subsequently unusable. All Lead-Acid batteries must be maintained when in storage. This means that the user must recharge each pack at least once a month. Lead Acid batteries will self-discharge due to stray internal resistances, causing very small drain currents. Thus the maintenance requirement for monthly recharging is critical to Long battery life. Do not leave the charger on all the time during storage. Also it is very important to use discharge the batteries on a regular basis otherwise the lifespan will be severely shortened. For more information contact our Support Department. | |||||
| Correct grounding technique for Geode seismographs | 1 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. | |||||
| RE: Geometrics preliminary MagArrow and MagEx data processing program download | 1 Relevance | 1 year ago | Ahmed Ramadan | Software | |
| Hello Dear Rui, I have questions regarding MagArrow Magnetic data compensation, if you can answer please, 1- Does the heading error compensation that applied by surveying data processing program remove the heading effect due to direction only or calibrates the maneuver effect due to the swinging of the sensor as well? 2- Regarding the heading compensation flight, I am confused about the best way to do this. In the manual, it is mentioned that we can apply a cloverleaf pattern (this is usually used in airborne survey) or a survey pattern or we can do a 360 degree turn at a certain point. However, it is written that we can use the calibration data measured in the turn, can I use the data from the turn to apply the heading error correction separately for each flight instead of doing a heading flight. Regarding the cloverleaf pattern application, is the data also processed in the same way using surveying data processing program? 3-What is the importance of the base station magnetometer data in this correction as mentioned in the manual, I think we can apply it without base magnetometer? 4- Finally, is there a specific flight that can be done to make maneuver correction (FOM) (roll, pitch and yaw) that we apply in conventional magnetic airborne survey? or We just resort to the LP filter. Sorry for the Long post Kind Regards, Ahmed | |||||
| Why does data transfer through WiFi become slow? | 1 Relevance | 1 year ago | Rui Zhang | Hardware | |
| If the system has a large amount of survey data, it may affect the data transfer rate. Sometimes a very slow SD card makes the system unresponsive; to the user this can look like a slow/bad network connection. Therefore, it might be useful to clean up the SD card and USB drive. Delete the Geometrics.log file on the USB drive. Clean up the survey data on the SD card: First, make sure that you have all the data that you need off of the SD card. Either download all survey data that you want to keep, or copy all of the contents of the SD card to another drive (perhaps to a PC). Delete all of the data on the SD card, doing one of the following: Use the UI to delete all of the surveys, then use the "Clean old files" button on the Admin page to empty the recycle bin on the SD card. This can be VERY slow, and because the MagArrow has a very simple web interface, the user will get no useful feedback. On a very full SD card, this process might take 30 minutes or so. Or.... Remove the SD card from the MagArrow and after copying any data that the user still hasn't saved to a PC, format it or delete everything on it, then re-insert it. Be careful not to lose the SD card or to let it drop into the inaccessible spaces in the instrument. If you format the SD card, the ExFAT format is preferable. If the customer can't get the data downloaded from the instrument (takes too Long or stops), the data can be imported into a survey in Survey Manager, directly from the SD card (or from the PC hard drive to which the SD card data has been copied). Then the SD card can be cleaned up or formatted. With the new version of Survey Manager (you need to update that also, not just the instrument software), the user can import a large survey, including all of the files in subdirectories, by selecting the "acquinfo.txt" file in the root directory of the survey, from the SD card. More details about how to import/export SD card files using Survey Manager can be found in the post below: SD card files conversion | |||||
| Why does my MagNav app receive no data from the instrument? | 1 Relevance | 1 year ago | Rui Zhang | Software | |
| 1. Make sure the tablet is connected to the instrument via WiFi. 2. The correct connecting sequence is as following: If you start MagNav, and then connect WiFi to the instrument, or if you connect WiFi to the instrument and then start MagNav, then you should receive data in MagNav. If you do anything to disconnect the WiFi, for example by rebooting the instrument, or by walking out of WiFi range, or by using the tablet settings to disconnect WiFi from the instrument, then you will not be able to see data in that original open MagNav session, even if you reconnect to WiFi. The app will not communicate to the instrument through this second WiFi connection. The solution is simple: close MagNav and then re-open it. MagNav will now communicate with the instrument (as Long as the WiFi is connected). 3. This is a common feature in MagNav, which applies to all other MagNav products, such as G-864. | |||||
| Good Practice - Charging the Atom | 1 Relevance | 2 years ago | Gretchen Schmauder | Hardware | |
| Attachment : Bulletin_Good Practice-Charging the Atom.V1.pdf This bulletin is written to inform those customers who purchased the ATOM 1C and 3C seismographs (“Atoms”), to allow for out gassing and temperature cooling when charging the batteries. Background: Geometrics has noted that some users use fitted cases for their Atoms to allow for safe shipping and handling between deployments. If the Atoms are fitted with charging cables and are being charged while inside the fitted cases, under certain circumstances, the fitted cases may not allow for sufficient air circulation and could lead to excessive temperatures inside the Atom unit. These excessive temperatures can exceed the battery manufacturers suggested safe charging temperature, resulting in some instances in out-gassing of hydrogen during the charging process. Recommendation: Geometrics recommends that users remove their Atom unit(s) from any enclosed/insulated boxes (including fitted cases) prior to charging. Each Atom unit requires adequate surface to air access for heat dissipation. We also recommend that users do not leave the Atom unit on charge for Long periods of time. Geometrics recommends that a typical maximum charge time should not exceed 12-15 hours. Precautionary Steps: In addition to using good practice charging as we have described in this Bulletin, Geometrics will provide users a procedure for installing a GORE® Protective Vent to allow for the release of pressure and gas from inside the fitted case housing should such pressure and gas accumulate. These vents can be installed at local service centers or at Geometrics factory. Please contact our Geometrics Support organization at for additional information. | |||||
| RE: Choosing the Right Lithium Polymer Battery for your MagEx | 1 Relevance | 2 years ago | Lynn Edwards | Hardware | |
| Some 7100 mAH batteries will work in the MagEx as well. One of those is linked below, as well as two 6200 mAH batteries. Only one of the 7100 mAH batteries will fit - the other must be 6200 mAH or less. These are big batteries that will last a Long time between charges, Smaller batteries will work as well but for a shorter time. A good rule of thumb is one hour of operation for each 900 mAH of capacity (at 23 degrees C). Colder temperatures will lower the capacity significantly. The links are to an Amazon USA website. Sankuru 7100mAH Battery Socokin 6200 mAH Battery Zee 5200 mAH Battery | |||||
| Environmental seismic refraction survey considerations | 1 Relevance | 2 years ago | Gretchen Schmauder | General Seismograph Info | |
| Can I do refraction on pavement? It is exceedingly difficult to do this, because the pavement is generally has a much higher velocity that the materials below it. It is generally not recommended. Can I do refraction on a hillside? Yes. The slope of the surface is not relevant (at least in theory, although there may be obviously practical limits). Can I survey in the rain? Rain won’t hurt the seismographs. If you are using a StrataVisor or SmartSeis and it starts raining, they should be fine as Long as they are kept vertical, with the screen pointing up. But acquiring data in the rain should be avoided, especially if there is lightning. Even in the absence of lightening, rain can be a significant source of noise, especially those raindrops striking the geophones directly. Obviously, the harder the rain, the more noise. If waiting the rain out is impractical, shielding the geophones themselves can reduce the noise significantly. If for some reason the seismic system must be left on the ground during an electrical storm, it is advisable to disconnect the trigger and geophone cables from the seismograph. | |||||
| How do you decide what type of strike plate to use for a seismic survey? | 1 Relevance | 2 years ago | Gretchen Schmauder | Application | |
| Below is a series of diagrams that can act as analogies for impacts. If the impulse is enacted rigidly (hard tip hammer, steel plate, etc.), the impulse will look something like the far-left figure. High-amplitude (height of the curve), narrow wavelength (width of the curve). This is because the impacted materials respond rigidly to the impulse, i.e. the hammer rebounds from the plate almost instantaneously. Therefore, as a result of the narrow-wavelength impulse, the transmitted waves will have relatively high-frequency (short wavelength) content. As you use softer and softer impact materials, applying impulses of equal force will appear like the diagrams to the right (smaller amplitude, Longer wavelength). The impacted materials are responding less-rigidly to the impulse, so the hammer spends more time on the plate due to the more absorptive nature of the impact. The same amount of energy has been put in (area under the curve), but the amplitude of the input (height of the curve) decreases to compensate for the input duration (width of the curve) caused by the impact absorption of the softer materials. Therefore, as a result of the wide-wavelength impulse, the transmitted waves will have relatively low-frequency (long wavelength) content. Using a more rigid striker plate (like one made of aluminum) on a hard surface can cause the generated wave frequency to be too high at times given the survey goals, so we suggest using a polyethylene plate on a relatively solid material like asphalt. Remember: lower frequency -> deeper signal penetration -> decreased signal resolution. | |||||
| Battery percentage and status | 1 Relevance | 2 years ago | Magnetics SW | MagEX | |
| Overview The MagEx instrument and the MagNav app both display information about the state of the instrument's battery. Battery state and reporting exist in bands according to percentage of remaining battery capacity: 30% or higher:The instrument has good remaining capacity.The LED on the instrument's power switch glows a solid green.MagNav displays the battery percentage or voltage in black text on a white background. Between 20% and 30%:The instrument has capacity to survey for additional time, but if you will be surveying a significant amount more, start thinking about changing the battery.The LED on the power switch is blue.MagNav displays the battery percentage with a blue background. Between 5% and 20%:You can continue to survey, but the battery is running low and you should consider changing the battery soon.The LED on the power switch is red.MagNav displays the battery percentage with a red background, and periodically notifies you that the battery is running low. Below 5%:The battery is running low, and the instrument may turn off at any time in order to preserve battery health. You should change the battery as soon as possible. Temperature-related effects:Battery performance also changes as the temperature of the battery changes; as the temperature of a battery falls, the voltage it supplies also decreases, and the total energysupplied by the battery decreases. This means that in cold weather a battery will not last as Long as in hot weather. The battery percentages reported in the instrument are adjusted for the effect of temperature; at a given battery voltage a cold battery will display a higher percentage than a warm battery will report. The effects of colder temperatures are not normally permanent; as a battery warms up, its output voltage and energy return to higher levels. Notes about the calculation:The MagEx instrument includes 2 batteries, and each battery includes 3 separate cells. Battery percentages are calculated from only one battery in the instrument - either the single battery if only one is connected, or from the better battery if two batteries are connected. Reported battery percentage is an estimate, based on measurements of the behavior of healthy batteries in instruments in the field and in the lab. Battery performance may change as a battery ages and as the temperature changes. The best practice for batteries is to use 2 healthy, fully charged batteries, and replace them both when the percentage falls below 20%. | |||||
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