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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

A CAD file of MagArrow can be downloaded here if you want to Design such a mounting structure. Attachment : MagArrow Shell.zip Please note that the external helical antenna is NOT in the CAD file.

With the provided 10-feet suspension cables, the magnetic noise due to most commercial drones can be ignored. However, some MagArrow customers experience stability issue, especially in windy conditions. For a small number of drones, the MagArrow can be attached to the landing gear Directly with acceptable noises (line-levelling is still required in data processing). For most drones, however, this configuration causes too much noise. A half rigid mounting Design may solve this problem. It has 2 rigid bars with hinges on one side and 2 flexible cables on the other. On the ground, the rigid side folds to the side. While in the air, gravity will keep the MagArrow further away from the drone. Drone noise can be greatly suppressed since the noise follows 1/R^3. A factor of 2 increase in the separation can lead to a factor of 8 decrease in noise. Please make sure the hinges and the rigid bars are made of non-magnetic material.

@georesults The microSD card is used in MagArrow, G-864, MagEx and other soon-to-be-released products.

Thanks Rui. But for which Geometrics hardware products?

We suggest using microSD cards with specs equivalent to or better than SanDisk Extreme and format it to exFAT.

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.

Many of our customers have found out that widening the attaching points of a MagArrow can greatly improve its stability (reducing swings) during flights. If you are interested in Designing a customized mounting fixture, a CAD file of a MagArrow baseplate can be found here:

In a general sense, the exploration depth of a magnetometer is unlimited. It is certainly sensitive to the Earth's field and this is generated in the Earth's Core, some 5000 km beneath our feet. But for practical purposes, the depth of exploration is determined from survey results by the spatial width of the magnetic field anomaly as observed at the Earth's surface. For Discrete objects, the depth of exploration is nominally 1/2 of the width of the magnetic anomaly. This topic is Discussed in our Portable Magnetometer Operation Manual. This Manual covers many topics related to survey Design and interpretation including exploration depth. As you will see, survey Design will have a large influence on the depth of investigation.

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

@ellipsis You are welcome! From the front of the front eyelets to the rear of the rear eyelets, it is a little more than 27 inches. So, your CAD reading is corret.

@rzhang thank you. I’m not sure if I’m reading the CAD file correctly. Is it 27.288 inches between the front and rear eyelets for cable attachments?

@ellipsis We would recommend the rigid part to be ~ 1m. So with the landing gear, the MagArrow is about 1.5m from the drone.