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| # | Post Title | Result Info | Date | User | Forum |
| RE: Rs232 Comms to maggy | 3 Relevance | 1 year ago | Lynn Edwards | G-882 | |
| I have set up a G-882 system here at Geometrics and am receiving data and sending commands using TeraTerm (any terminal emulation program should work). When in Normal use mode the Digital add on board sits in front of the G-882 and parses and acts on all commands coming in. There are two versions of the Digital Add On board, which are the GP120 and the GP140. The GP140 is a newer version of the Digital Add ON board. It is the GP140 Digital board that outputs all S/N (and other) information. I first set up with the GP140 board (the newer version). I find that the ""RESET" command does work - i.e. it goes into BYPASS mode for a couple seconds, then output the S/N and configuration information, and reverts to Normal operation with the digital depth and altimeter information. But it only works every other time I send it. The first time nothing happens. Then I send it again and it works. This appears to be a bug in the GP140. For some commands the first command after power up or reset are ignored. The second time (and subsequent commands) are executed. The work around seems to be sending the RESET command twice. I also tried an older G-882 with the GP120 Digital board. The Reset (and other commands worked first time and every time. BTW, the Digital Board version is in the second line with the S/N information that is sent on power up or Reset. Some questions: 1) My configuration is one G-882 connected to a PC through the white junction box. Is this your configuration, or do you have concatenated G-882's? 2) Can you get the G-882 to accept any commands (like going into Bypass Mode)? I'm wondering if there is a open link in the command line from the PC to the Digital board. | |||||
| Time range displayed in Geometrics Atom downloader software while downloading atom files is in UTC or Local time? | 2 Relevance | 2 years ago | Vivek Iyer | Software | |
| Hello guys, can anyone confirm that the Time period displayed in the Geometrics Atom Downloader software is in UTC Or Normal local time? cause I cant match the recorded time with the time period of the files displayed in the software. Please guide! | |||||
| How to change screen brightness on Panasonic Toughpads | 2 Relevance | 2 years ago | Magnetics SW | MetalMapper | |
| To change the screen brightness on a MetalMapperII Panasonic Toughpad: 1) If you want to type easily, plug a keyboard into the USB socket in the side of the toughpad. Otherwise, use the screen keypad. 2) Open a terminal window (using the Applications menu). 3) Type the following command: sudo bash -c "echo 892 > /sys/class/backlight/intel_backlight/brightness" You will need to enter a password, which is the default password for the standard user. To set different levels, replace the number 892 with other numbers. 892 is the maximum number allowed; lower numbers will result in a dimmer screen. The change should take place immediately. Then close the terminal window and return to Normal use. | |||||
| GNSS Anomalies | 2 Relevance | 2 years ago | Magnetics SW | General Magnetometer Info | |
| The Geometrics magnetometer softwares check for some uncommon anomalies in GNSS location and timing messages in data collected with the G-864, MagEx, and MagArrow instruments. These anomalies have occurred in data from a few instruments: Extra PPS timing signals – Sometimes the PPS sensor in the instrument receives an extra timing signal that’s out of phase with the Normal 1-second interval. These are almost always easily identified and discarded. GNSS timing anomalies – Very rarely, the GNSS appears to change its mind about the current time or location. For example, after recording a time at 06:30:21, the next measurement – received one second later – might show a time of 6:30:15 – 16 seconds earlier. GNSS location anomalies – A GNSS timing jump may be accompanied by a location jump. Geometrics’ software now makes additional checks for these anomalies, corrects them when possible, and reports them if they affect the use or visualization of the data. Some of the checking is in the instruments, some in MagNav, and some in Survey Manager. Users will notice these anomalies and the functionality to repair and report them in these ways: During import or export, the software identifies an anomaly. If it’s judged to be worth reporting – most likely because it affects the reported locations of magnetometer readings – then it is logged and the user asked to review the log file. The user exports data and notices something unusual, for example a discontinuity in the GNSS times or locations. The customer should review the software’s log files for additional information. These anomalies are unusual; the type where the GPS changes its mind about the time or location is exceedingly rare and will never be seen by most customers. The main effect of the new functionality is that the data validation process will now be more visible to users. | |||||
| Why does it take so long for my MagArrow GPS to lock? | 2 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. | |||||
| Intermittent Issue Diagnosis | 2 Relevance | 2 years ago | Rui Zhang | Hardware | |
| General information The most common symptoms of intermittent connection issues are shown below: D_CY shows a background decay signal is either much higher than Normal, and/or C_CY is a flat line (doesn’t decay). Figure 1 Intermittent connection issue. Where is the failure occurring? The two most common places where intermittent issues occur are at the two ends of the Rx cable: the joint between the Rx cable and the Cart and the joint between the Rx cable and the EDA box (orange box). Now we need to identify which joint has the intermittent issue. Set up the MM2x2 in DAM mode. Collect DAM data while keeping the Cart stationary but tapping one joint. Collect another DAM data while tapping the other joint. Analyze the DAM data by plotting the “Monostatic_5” for all 12 Rx channels in Geosoft. The channels having intermittent issues will appear much noisier. If you have MatLab software, you can download the MatLab code to analyze the DAM data. Example plots are shown below. It is obvious that “ZA” channel has the intermittent issue in Figure 2 and “XB” channel is open in Figure 3 (very flat line, no noise at all). Click here to download the code: Attachment : Intermittent_noise_full.zip . If both DAM and IVS data have the same problematic channel(s), we are confident that the intermittent issues observed in IVS data are repeated in DAM data, and by tapping at that location, we are able to identify the intermittent joint. Figure 2 Intermittent "ZA" channel. Figure 3 Open "XB" channel. What to do next? Disconnect the problematic joint and clean the connectors on both sides thoroughly (using an acid brush and a can of compressed air). Reconnect and try the tapping method again. If the problem goes away (no more noisy channels), the intermittent issue is likely caused by dust. If cleaning doesn’t fix the problem, swap out the Rx cable and repeat the tapping method. If the problem goes away, it is likely caused by a bad Rx cable. If there is another set of EDA and Cart available, swap out the EDA and the Cart to identify the problematic part. If not, use the tapping location to identify the problematic part. Fill out the RMA form at . If it is the Cart, send in the whole system for inspection/repair. You can contact Geometrics for MM2x2 rental if you need to continue your work during the down time. If it is the EDA, we recommend sending in the EDA only. It will save your repair time since it is much faster to unpack/pack/ship the EDA than the whole system. You can contact Geometrics for EDA rental if you need to continue your work during the down time. Warning Please note that this tapping method should ONLY be tried when intermittent issues have been observed in IVS tests. It is NOT recommended to use it as a daily QC test because it does put extra stress on connectors and likely leads to a shortened connector lifetime if applied too often. | |||||
| What does different Sensor Modes represent? | 2 Relevance | 2 years ago | Rui Zhang | Software | |
| There are 3 different Sensor Modes: Heating, Locking and Normal. Heating and Locking are stages during startup. Heating means the Cs cell is warming up and Locking indicates the laser locking (frequency/wavelength stabilizing) stage. In room temperature, Heating should take less than 5 minutes and Locking less than 10 minutes. If the startup time takes much longer than expected, please check the error code displayed on (and click “Detailed Instrument Status”). | |||||
| What is a “velocity inversion”? | 2 Relevance | 2 years ago | Gretchen Schmauder | General Seismograph Info | |
| A velocity inversion refers to the case when seismic velocity decreases, rather than increases, with depth. When this happens, energy refracts away from the Normal: This means that no information from the refracting interface returns to the surface, hence no information is gained about that interface, even its very existence. This is demonstrated by the animation below. There are three distinct velocity layers, but Layer 2 is slower in velocity than Layer 1. The result is a travel time curve that indicates the presence two layers -- layers 1 and 3. Layer 2 is not sampled, so there is no evidence of its presence in the record. However, the presence of Layer 2 does impact the travel time plot by moving the crossover distance out farther than it would be otherwise. The result is that not only is Layer 2 not detected, but the depth to Layer 3 is incorrect -- it is calculated to be deeper that it is. | |||||
| What is the Reflection Coefficient? | 2 Relevance | 2 years ago | Gretchen Schmauder | General Seismograph Info | |
| The Reflection Coefficient R between two velocity layers is expressed as: R = (ρ2V2 - ρ1V1) / (ρ2V2 + ρ1V1) Where ρ = density and V = velocity. The quantity ρV is the seismic impedance of the material. The Reflection Coefficient is therefore the difference in seismic impedance over the sum of seismic impedance of two materials. From the above equation, it is apparent that R will be a positive number when V2 > V1, and a negative number when V2 < V1. A positive R means that the polarity of the reflected wave will be the same as that of the incident wave. A negative R means that the polarity of the reflected wave will be the opposite of the incident wave. It should also be apparent that the larger the contrast in seismic impedance, the larger the amount of incident energy that is reflected (and the smaller the amount that is transmitted). The above assumes Normal incidence. For incident angles other than 90o, the equation is more complex. | |||||
| Why does the Signal Strength Vary with the Magnetic Field in High Gradient Locations? | 2 Relevance | 2 years ago | Gretchen Schmauder | General Magnetometer Info | |
| If the sensor is in a very large gradient field such as inside a building near some steel objects, then the high gradients (change of field with distance) causes different parts of the internal sensor components to respond to different fields, making the sum signal smaller. This only takes place when the gradients are very large such as several thousand nT per meter and will not be seen under Normal survey conditions. | |||||
| What is a seismic wave? A seismic ray? | 2 Relevance | 2 years ago | Gretchen Schmauder | General Seismograph Info | |
| A seismic wave is the transfer of energy through elastic earth materials by way of particle oscillation/vibration. A seismic ray, or “wave front Normal”, is an arrow drawn perpendicular to the seismic wave front to indicate the propagation direction at that point on the wave front. It is a convenient tool to help understand wave propagation through layered media; it is not something that exists in a physical sense. | |||||
| How difficult is it to manually tow the OhmMapper? | 2 Relevance | 2 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. | |||||
| Steps to prolong the life of your OhmMapper system | 2 Relevance | 2 years ago | Gretchen Schmauder | Hardware | |
| The dipole cables are a high failure item as they are subjected to considerable wear and tear. Here are some steps that you can take to prolong the life of the system: Never lift the transmitter or receiver by the pulling on the Dipole cables. While setting up the system, it is extremely important to remember that the transmitter and receiver can easily slip out of the white neoprene covers if you are not paying attention. This will cause them to hit the ground and break the yellow connector, or at the very least jam foreign debris into the connector. A good habit to get into is to carry the units with the nose (cone shape) pointed down, that way they cannot slip out of the neoprene cover. Do not put undue stress by pulling on the system at angles greater than 45 degrees at any given point in the array. Always make broad turns or pick up the array to start a new line. Make sure that the transmitter and receiver are always facing the direction of travel. (The cone pointing towards the console/operator) This will eliminate the possibility of turning the array into a "plow" and placing excessive strains on the connectors, not to mention communication problems. By following these instructions you will find that the instrument's connectors will be able to withstand the strain incurred during Normal usage. Of course there may be circumstances that make this difficult, but it is good to be aware of these issues. | |||||
| Does the Geode Seismograph require scheduled calibration services? | 2 Relevance | 2 years ago | Gretchen Schmauder | Hardware | |
| Our seismographs do not require periodic calibrations in that they do not have any adjustable parameters. With that being said, we do recommend that they are checked for performance and routine maintenance to include intensive analog tests of the acquisition circuitry. A reasonable interval would be around every 5 years for Normal usage. During these tests we verify that the seismograph analog performance meets our specifications by using a seismic test system. This system incorporates a standard reference oscillator and precision resistor networks to inject known signals into the seismograph. We then use algorithms in our software to calculate the response and performance of the analog circuits. This "performance test" is run whenever we receive an instrument in for repair or evaluation. Some of our customers do prefer to have the performance of their instrument checked on a periodic basis especially if they are required by their clients, for example the NRC. We offer these nontraceable recertification’s to include a calibration certificate and test results for a fee of $300. If you would like us to perform performance verifications and a system evaluation please reserve an RMA and obtain shipping instructions. | |||||
| How do you convert a Geode from 2D to 3D use? | 2 Relevance | 2 years ago | Gretchen Schmauder | Hardware | |
| 1. Hook up Geode in Normal configuration to computer Ethernet box. 2. Select Start New Survey. 3. Uncheck Line Tap. 4. Uncheck Aux. 5. Select YES to all pop up menus. 6. Locate lower left corner menu: Seismodule List Window. 7. Note what current loader version under LDVER column of table in Seismodule List Window. (Ex. 2.729) 8. In order to change the LDVER, you must first set up the table in column F from N/A to X by doing the following: 9. Select System pull down menu from the upper task bar. 10. Select Test. 11. Select Update System Board Bios. 12. Select I Agree. 13. Select Browse. 14. To set up table to enable loader version update (LDVER) select the file: GEODEFOR3D-1.0.exe. 15. Select Open. 16. Select Start Burning. 17. Select Yes. 18. Cycle power or shut down controller by using the software. 19. Restart the Geode. 20. Repeat necessary steps to get to Seismodule List Window. 21. Verify value in column is now X. 22. Select System pull down menu from the upper task bar. 23. Select Test. 24. Select Update System Board Bios. 25. Select I Agree. 26. Select Browse. 27. Select from Flash Update File Flash3_703&2_42.exe. 28. Select Start Burning. 29. Select Yes. 30. Verify Power LED light on Geode now blinks 3 seconds on 1 second off. 31. Select OK. 32. Cycle power or shut down controller by using the software. | |||||
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