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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.

I have attached the instructions that are sent with a new order acknowledgment. (Installation and Transfer) The license is assigned to a specific Registration ID once fully purchased. This ID can be assigned to a person (we like to know for our own records) if possible but not required and can be transferred to other PC’s as needed. The ID works like a softkey dongle. The software can be active on only one machine at a time. I attached a simplified “Steps with windows_SI Transfer procedure that shows how the software can be moved. The PC must connected to the internet to affect the first part of the transfer (which removes the ID from the PC, making available for the next). Then to place the Reg ID on the next computer is just following the original registration process. Do not lose the ID. Make sure that the ID has been removed before a disc is reimaged or an employee leaves with the PC. If for some reason the Reg ID has to be reset, (computer dies before the ID can be removed) I will require a statement and an end user then for my records. I am available to discuss if needed at the number below 0700-1500 PST. Best, RandL P RiveraCustomer Service Repair Supervisor+1 (408) 428-4254 (direct)+1 (408) 954-0522 (office)support@geometrics.com Attachment : SeisImager_LicenseTransfer_Instructions_v1.2.pdf Attachment : Steps with windows_SI Transfer.pdf Attachment : SeisImager_Installation_Instructions_v7.6.pdf

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.

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.

1. If the frozen issue is intermittent, please update to the latest MagArrow embedded software and survey manager, which can be found in the download section of MagArrow. The compass status can now be monitored on the browser interface. If the compass fails, power cycle the MagArrow.2. The frozen issue often occurs during the startup when the MagArrow faces exactly north/south/west/east. The compass initialization sometimes fails when one of the compass readings is close to 0. The latest embedded software greatly improves the robustness of the startup procedure. However, if the frozen issue persists, please power up your MagArrow facing north-west.3. If the above two steps do NOT fix the issue, the MagArrow has to come back for Repair.

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.

The cesium used in our magnetometers is the non-radioactive elemental metal, isotope Cs 133. We employ approximately 120 to 240 micrograms of cesium metal in the sensor divided between the lamp and absorption cell. These are small glass ampules, each containing a volume of 1/32 to 1/16 of a cubic millimeter of cesium. If either or both the lamp and cell should break the cesium will instantaneously react with the air and moisture in the air to become Cs2O and/or CsOH. Both compounds are caustic but the quantity is so small that it is of no health concern. Finally, the lamp and the cell ampules are contained in a G10 housing that is then contained inside a sealed PVC housing. If the sensor should cease working due to a broken lamp and/or cell, it is not field Repairable. Return the sensor to Geometrics for Repair, replacement and/or disposal.