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| # | Post Title | Result Info | Date | User | Forum |
| How to set up dead-zone-free operation for MFAM | 5 Relevance | 3 years ago | Gretchen Schmauder | Hardware | |
| MFAM-SuperMag (LCS100S) or MFAM-SX (LCS100X) can be configured to achieve dead-zone-free operation, in which the combined sensor is always active no matter where in the world and which Direction the device is oriented. To set up the dead-zone-free configuration: Make sure the MFAM is in the "One Sensor (No Dead Zone) run mode. If not, please refer to "How to switch the operating mode for SuperMag MFAM" on our website found here: How to switch the operating mode for SuperMag (LCS100S) MFAM?. Orient two sensors orthogonally. The ideal relative orientation is shown below (also in the test report in the USB drive shipped with the unit). This configuration works for both the "Low Heading Error" and the "Low Noise" modes. Low Heading Error Only mode If you only wish to run the sensor in the "Low Heading Error" mode (note that SX MFAM does NOT have the "Low Noise" mode), a simpler configuration, as shown below, can also achieve the dead-zone-free operation. | |||||
| How to bulk process MagArrow magdata files? | 2 Relevance | 1 year ago | Rui Zhang | Software | |
| If you have many .magdata files to convert, it is more convenient to use the command-based MagArrowConverter, instead of the Windows-based Survey Manager. The MagArrowConverter installation file can be downloaded from MagArrow product link under firmware/software download: To use the MagArrowConverter: Run “MagArrowConverterInstaller.exe” to install the converter. It is recommended NOT to install the converter on the default C:\Program Files\ Directory since some computer may not allow users to create files in this Directory. Open Windows Command (“cmd”) and enter the Directory where the converter is installed. Type MagArrowConverter and press Enter key. A short instruction of how to use the converter will be printed out. If you run it from a Different Directory, type the Full path, e.g. "C:\ Geometrics\MagArrowConverter\MagArrowConverter" (assuming the program is installed in C:\ Geometrics\MagArrowConverter\ Directory). Note that to change the installation Directory, you will have to un-installed the program first and then re-install and set up the Directory. A typical example command: …\MagArrowConverter type=MA1 format=csv1 input=”C:\test\test.magdata” output=”C:\test\test.csv” decimation=10 A new csv file with sample rate of 10Hz will be created in C:\test Directory from test.magdata file. After you become familiar with MagArrowConverter command, you can write a simple Batch Script to bulk process MagArrow .magdata files. An example batch code which searches for .magdata files in "C:\MagArrowData" folder and converts all files to .csv files at 10Hz is attached below. Attachment : batch example.zip | |||||
| RE: Geometrics preliminary MagArrow and MagEx data processing program download | 2 Relevance | 2 years ago | Rui Zhang | Software | |
| Hi Ahmed, Depending on the corner frequency of the LPF, some heading related noise may be removed already by the LPF. The heading correction (the Full maneuver compensation, not line-leveling) will then add the noise back to your data. In your flow chart, I would do heading correction before LPF. In addition, I would use raw data of 10Hz instead, because at certain parts of world, the AC power is at 50Hz. There will be 50Hz alias into 20Hz raw data. | |||||
| Why does data transfer through WiFi become slow? | 2 Relevance | 2 years 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 | |||||
| RE: What is the MagArrow GPS accuracy in position/elevation/altitude? | 2 Relevance | 2 years ago | Magnetics SW | Hardware | |
| Here are a few additional details relating to the measurement of elevation: GNSS AccuracyAccuracy depends on multiple aspects of the GNSS system: among them are clock accuracy, atmospheric effects, and satellite geometry. Satellite geometry"Satellite geometry" refers to how the currently visible satellites are Distributed in the sky - close to each other or scattered around. The best satellite geometry includes satellites that are near the axes on which you hope to locate your receiver; for example, to locate your receiver on the East/West axis, it's helpful to have good reception from satellites low in the sky in the East and in the West. If you also have satellites that are low in the sky near the South and North horizons, you will have good accuracy on the horizontal (latitude/longitude) plane. It's best to have satellites scattered around the sky, overhead as well as near the horizon all around. HDOPMagArrow records HDOP, a standard measure of satellite geometry's effect on horizontal (or latitude/longitude) accuracy. A smaller number (less than 1.0 is very good) indicates that the visible satellites are in good positions to contribute to accuracy. Vertical AccuracyThe reason that GNSS systems aren't as accurate on the vertical axis as on the horizontal axes is that no satellites are visible in a Full half of that axis: the half that is below the horizon. Consequently, vertical accuracy is on average about half that of horizontal accuracy; calculated offset from true elevation is on average about twice that as on the horizontal axes. While on average HDOP can therefore be used to estimate VDOP (the similar measurement of the effect of satellite geometry on the vertical axis), that estimate is only a rule of thumb; it is possible to have an excellent HDOP, reflecting very good horizontal satellite geometry, while having poor vertical satellite geometry. In those cases, good HDOP does not indicate good VDOP. Keeping in mind that possibility, a combination of good HDOP and many satellites in view usually indicates good VDOP. Practical effects Some data processing techniques (upward continuation, for example) can include elevation as an input. Customers who are considering using GNSS elevation in those techniques should conduct a careful analysis of their data and develop test routines to verify that all their data meet the requirements of the technique and its application to a particular survey. Some customers who require very accurate elevation data incorporate LIDAR data and drone elevation data into their analyses. | |||||
| Which geophones should I use for seismic reflection? | 2 Relevance | 3 years ago | Gretchen Schmauder | General Seismograph Info | |
| The de facto "standard" for high-resolution reflection is 40-Hz geophones. The 40-Hz cutoff will filter out much of the ground roll, allowing you to use the maximum gain even at near offsets, and taking advantage of the Full dynamic range of the recording system. | |||||
| Use and Care of G-857/G-858/G-859 Batteries | 2 Relevance | 3 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. | |||||
| RE: How to set up dead-zone-free operation for MFAM | 2 Relevance | 3 years ago | Rui Zhang | Hardware | |
| You can 3D print a dead-zone-free sensor holder from the attached .step file. Attachment : Sensor Holder Perm Shell_Thin Wall_v10.zip | |||||
| An Important Note About Altimeters | 2 Relevance | 3 years ago | Gretchen Schmauder | Hardware | |
| Geometrics recommends that customers purchase the G-882 and altimeter together from Geometrics to ensure Full factory testing and compatibility. For more details about this, please click here. | |||||
| User Registration | 2 Relevance | 3 years ago | Wei Jiang | News & Events | |
| For new user registration, please email the following information to wjiang@geometrics.com Username: Email Address: First Name: Last Name: Company: Country: 🚨 Important Notice: Your Posts Are Public! 🚨 We want to remind you that this forum is a public platform, which means that any information you post here will be visible to everyone. Before sharing personal or sensitive information, please keep in mind the following: Privacy Matters: Be cautious about sharing personal details such as your Full name, contact information, or any confidential data. Think Before You Post: Take a moment to consider the content of your messages. Once it's out there, it's public. Be respectful and adhere to our community guidelines. Respect Others' Privacy: Remember that other users' posts are also visible to you. Always respect their privacy and refrain from sharing their information without permission. Use Private Messaging: If you need to share sensitive information with another user, consider using the private messaging feature available on this forum. Report Inappropriate Content: If you come across any content that violates our guidelines or poses a privacy concern, please report it immediately. By participating in this forum, you acknowledge and accept that your contributions are public. We encourage open and respectful Discussions while keeping your privacy and the privacy of others in mind. Thank you for being a part of our community! | |||||
