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Thank you for detailed answer. I understood that common practice is separate grounding of each module. Also we will definitely try to shield each geophone with a separate ground, but this will require a large amount of preliminary work. Regarding 50 Hz filtering. We conducted a small experiment in the field to determine the frequencies of background electrical noise captured by geophones. Having Set the minimum possible sampling period for Geod, I recorded 9 consecutive intervals (128 seconds each) of passive observations. This resulted in a total of 19.2 minutes of continuous background noise recording at 125 Hz sampling rate. Then I calculated the signal spectrum from each geophone separately (19.2 minutes of recording), and then obtained the average spectrum for all sensors. For example, the figure in the appendix shows the average spectrum from 24 sensors (red curve) versus the spectrum of an individual geophone (blue curve). In general, I am interested in noise in the 30-50 Hz range. There are no clear peaks at 50 Hz on the frequency response graph. Peaks at 20, 25, 30 Hz are present constantly at any time of the day. In general, the frequency response of passive observation signals increases smoothly with a maximum around 48 Hz. I mean that filtering in some narrow frequency range in this case will not help much in my understanding. Thanks again for the advice. We’ll experiment. Attachment : 24 geophones 19.2 minutes 125 Hz sample rate.jpg

Hi Rui Zhang, Thanks for your prompt response.Loading the ethernet firmware did not work. I have the following observations:-1. Dev kit working well with wifi but not getting connected via Ethernet port.3. I have Set the correct IP address in my PC according to the manual and the other post you ask to refer. It was working well a few weeks before with the same Setting.2. Tried multiple attempt to install Tiva_Interface_EK_Public.bin, every time looks like its getting installed because I did not find the btb.bin in SD card after powering it up. If the Tiva_Interface_EK_Public.bin is installed, dev does not work with wifi as expected because Ethernet software is installed ?3. Also tried btb_192.168.2.3.bin and btb_192.168.2.4 provided inside TIVA_Ethernet_EK V1.1.1 Firmware folder. But no Ethernet led blinking on dev kit. I also tried ping using terminal.4. Also tried the Reset switch but the same status. Thanks a lot

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.

The cables between the sensors and the MFAM module are flexible circuit boards, and the length is limited to 20 inches. It is possible to remove the MFAM module from the Development kit box and then reconnect it using a ribbon cable. That would allow you to extend the MFAM module and sensors away from the Dev Kit box. Our engineers have tested it to 4 meters. Below are some details about the ribbon cable. The connector on the MFAM unit is Samtec FSH-110-04-F-DH. Its mating connector is Samtec SFMH-110-02-L-D-WT. The easiest option for an extender cable between the MFAM and the Dev Kit is a pair of cable assemblies from Samtec www.samtec.com which has male/female mass terminate connectors put onto a ribbon cable.  These connectors plug directly into the MFAM I/O connector and also into the Development Kit.  We are comfortable with lengths to 10 feet total.  The samtec P/N for this cable is:  FFMD-10-T-60.00-01-F-N The ‘60.00’ number specifies the cable length in inches (which equals 5 feet).  We have found that there is generally a 2-4 week lead, time since they are made to order and not an off-the-shelf part. (There is another solution as well if you want to make adapter boards at each end (Dev Kit and MFAM).  The exact Samtec mates for the MFAM / Dev Kit connectors are made in PCB mount connectors only, so if you make simple small adapter board to adapt the samtec connector to another connector of your choice.  We've done this with ExpressPCB which is fast and inexpensive.  A board Set from ExpressPCB is about $70 including shipping.  Our Engineering Team has a design and parts list they can send you if you're interested in going this route.)

Customers can pre-define a survey area using Google Earth Pro and load the KML file into MagNav app. Open Google Earth Pro. Navigate to your survey area and click “Add Path”. Move your cursor and left click to define the outline of your survey area. You can rename your path name and click OK. Select the new path created and right click it. In the pop-up menu, click “Save Place As” to save it as a kml file. Open the Survey Manager. Load an existing project or create a new project. Inside the project, create a new survey. Set up other preferred parameters. Click “Select Route File” and load the saved kml file. Make sure to click “Save” before exiting Plug in a USB drive and copy the project (.dbt file) to the USB. Eject the USB from your computer to make sure it can be safely removed. Turn on the instrument and the Getac tablet. Make sure the wifi is connected. Plug the USB drive into the Getac tablet. Open the MagNav app. Click “Import Project” to load the project (.dbt file) from the USB. Enter the project and enter the survey. On the Navigation page, the path created in Google Earth will be displayed, which can be served as guidelines or outlines for GPS surveys. Marker points can be created similarly for marked surveys.

GPS Clocks, used in Continuous Recording systems to provide 1 pps signal to trigger seismograph. Also provides GPZDA serial string to stamp records with UTC for Continuous Recording and Self-Triggering systems. Includes cable Set to connect clock to PC, seismograph, and 12V DC power. There are three GPS clock options for the Geode we sell. They are: GS-101B GPS clock from Orca, 1 pps accurate to within 100 ns of the precise time. Includes waterproof antenna with separate electronics module, with display of time and other indicators. Provides time base during loss of satellite lock. Options to provide 1 pps referenced to an IRIG-B generating source and to enclose electronics module in hardened aluminum case (P/N 25374-59). A101 Smart Antenna GPS clock from Hemisphere GPS, 1 pps accurate to within 20 ns of the precise time. Includes waterproof antenna with integrated electronics, with indicator of satellite lock, no display of time. Provides time base during loss of satellite lock. GC200 GPS clock from San Jose GPS, 1 pps accurate to within 1 μs of the precise time. Includes waterproof antenna with integrated electronics, no display of time or other indicators. No time base during loss of satellite lock. The level of precision needed determines which GPS clock is best suited for the job. Typically the GC200 fulfills the needs of 95% of our clients.

In general, avoid stainless steel parts. If you have to use stainless steel parts, make sure it is made of SS316. To make sure that the parts are magnetically clean, you can Set up the MFAM Dev Kit in the gradiometer mode. 1. Have the two sensors separated by 20cm or more. 2. Turn on the gradient reading (green curve) in MagViewMFAM. 3. Place the part 10cm to one sensor and 30cm to the other. 4. Rotate the part while monitoring the gradient curve. Make sure you don't have any magnetic parts (such as keys, cell phone, watch) with you while doing this. 5. The peak-to-peak difference in the gradient curve (you may have to adjust the gradient scale if the curve wraps on screen) is the magnetic signature of the part at 10cm. 6. For the magnetic signature at different distances, scale the reading as 1/R^3. For example, if the part will be 20cm away, its magnetic signature should be 1/8 of of the reading at 10cm.

Geometrics seismographs are designed to trigger on a contact closure, contact open, or signal input. The trigger circuit has protect from high voltages, but it is possible to damage the input circuit if voltages outside the specified range are connected directly to the input circuit. It is recommended that input signals, or voltages do not exceed + 10 volts. A typical voltage measurement using a hand held volt meter on pins A (+) and B (-) of the 3 pin trigger input connector will be 4.9 volts DC. Voltages less than 4.0 volts may indicate a problem with the trigger circuitry. Often times the unit will continue to operate and trigger, but should be serviced at the next opportunity. If the circuit has been damaged, typical problems will include false triggers, or failure to trigger. To verify the trigger function of the Seismograph, begin by removing the external connector from the trigger input, and short pins "A" and "B" together on the trigger input connector of the seismograph. The unit should trigger each time the pins touched as long as the interval between triggers is greater than the record time or the trigger hold off whichever is longer. It should not trigger unless these pins are touched. If consistent triggering is achieved using this method, then attach the hammer switch directly to the seismograph. Do not put the hammer switch on a hammer yet. Tap the hammer switch cylinder on the edge of a table or other hard object and verify consistent triggering. Watch the stack count on the screen to confirm each tap of the hammer switch results in a trigger of seismograph. Check the trigger hold off Setting and trigger sensitivity Settings. Set the trigger hold off to 0.5 sec. and the trigger sensitivity to 50. If the seismograph is triggering correctly, insert any trigger extension cables between the hammer switch and the seismograph. Repeat the test to confirm consistent triggering. Then attach the hammer switch to the hammer, or other device used for triggering. Make sure the cylinder of the hammer switch is firmly taped to the handle, and the direction of motion is across the diameter of the cylinder. You can also attach a geophone or other signal producing devise at this point and verify proper triggering. If the unit does not properly trigger, contact support with the results of the tests above for assistance.

Can the Self Trigger function (extra purchased option) replace the conventional trigger (hammer switch) and trigger extension cables typically used in refraction work? Self-Triggering doesn’t provide sufficient timing accuracy to work for refraction surveys. For refraction interpretation, the accuracy of the absolute travel time between source event and arrival at the geophone must be on the order of ≤ 5 milliseconds. This cannot be achieved with the self-triggering processes. This is because the self-triggering option works by breaking the data into small'Time Windows' and comparing the energy levels in these against the average background energy. These time windows and the ratio values are chosen by the user, so accuracy will depend upon the length of the window and how tightly you can specify the change in energy levels. In cases where you don't have a trigger switch, you can Set up the Geode to provide pre-trigger data and place a geophone close to the source. The extra geophone acts as a trigger and will start the survey at T = 0. For more information, click here

Detailed instructions for changing the operating mode of the SuperMag(LCS100S) MFAM through the SPI can be found in the Module User Guide, located in the USB drive shipped with the product. The operating mode can be changed through the MagViewMFAM software (software installation is also in the USB drive). Use the MagViewMFAM to connect to the MFAM. After startup, the "Run Mode" indicates the current operating modes. To change the operating modes, choose "Run Mode" in the "Command Menu" and then select a different mode in the drop-down menu. Click "Send Command" button to change to the selected mode. To Set the current modes as the default startup operating modes, select "Save Settings" and click "Send Command". Power cycle and make sure that the default startup operating modes have been saved.