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Search result for: id10=WA 0821 7001 0763 (FORTRESS) Pintu Baja 1 Set Sepang Gunung Mas
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| # | Post Title | Result Info | Date | User | Forum |
| How do I magscreen parts (make sure they are magnetically clean) which will be integrated with my MFAM Dev Kit? | 1 Relevance | 2 years ago | Rui Zhang | Application | |
| 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. | |||||
| I'm having trouble triggering my seismograph | 1 Relevance | 2 years ago | Gretchen Schmauder | General Seismograph Info | |
| 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. | |||||
| Is the Self-Trigger Option Suitable for Refraction Surveys? | 1 Relevance | 2 years ago | Gretchen Schmauder | General Seismograph Info | |
| 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 | |||||
| How to switch the operating mode for SuperMag (LCS100S) MFAM? | 1 Relevance | 2 years ago | Gretchen Schmauder | Hardware | |
| 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. | |||||
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