Gecko Compact Product User Manual
Also see for Blast: Product user manual
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Contents
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33Installing the Gecko PrismThe Gecko Prism contains a very robust but very sensitive velocity sensor. Once theseismograph is powered on, be careful not to move the sensor. Pressing the buttons tocontrol the unit should not send the sensor into a clipping condition. If you accidentallyknock the sensor and the signal levels start clipping, simply turn the unit off for a secondand then on again to quickly settle the sensor.Checking Sensor OperationAfter powering up your Prism, from the Home Screen it is recommended that you press theUp button to view the signal values to check that the sensor starts up correctly.About 20 seconds after power is applied, the Prism sensor will start up, one channel at atime: East, North, then Up. Depending on the tilt, the signal values will shoot to a full scale(positive or negative 8 million counts) and it will then begin to settle to the zero level. Thevalues may stay at the clip level for a few seconds as the sensor output has a greater rangethan that of the recorder, but you’ll soon start to see the numbers heading towards a zerosignal level. It takes about an hour for the integrators to settle and get close to the zerolevel, and a few hours to settle completely - see 6+ hour recording below.If one of the channel signals appears to be jumping around randomly, or if the sensor ismaking a regular clicking or buzzing sound, turn the Prism off and on again after a fewseconds to restart the sensor initialisation routine. This state may occur if you knock ormove the sensor excessively during the initialisation period. |
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