Gecko Compact Product User Manual
Also see for Blast: Product user manual
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Contents
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292. Insert anchor thread-side up into hole. Gently tap with hammer until flush with surface3. Insert the tapered end of the anchor setting tool into the anchor.4. By tapping down the embedded spreader, the anchor will bite into the hole. A few firmtaps of your hammer will be enough to punch the spreader to the bottom of the anchor.5. Screw the supplied 8mm threaded rod into the anchor. After tightening, ensure the rodcannot be pulled out of the ground by hand.6. Using the central hole in the Gecko, slide the unit over the threaded rod.7. Orienting your recorder depends on your application. We recommend:a. For earthquake monitoring, rotate the Gecko until the arrow is pointing Northb. For structural monitoring, point the North arrow along an axis of your structure8. Loosen the upper locking nuts on the adjustable feet and screw the feet in or out untilthe bubble on top of the Gecko is centred indicating that the chassis is level.9. Screw the locking nuts up to the base of the Gecko so that the feet can no longer beadjusted.10. Use the supplied flanged plastic nut to lock the Gecko down onto the threaded rod.Hand tightening is sufficient to tie the Gecko down for better coupling and to avoidaccidental movement.If you need to move your sensor, you can reuse the threaded rod and locking nut.Additional M8 Ramset DynaSet Drop-in Anchors can be purchased at hardware stores, orcontact us if you require any spare parts.Gains, range and clip levelsThe Gecko Blast’s geophones have a nominal output of28.8V/m/s. The Gecko recorder has an input range of ±20V at again of x1, which equates to a clip level of 694.4mm/s. Thetypical noise level at a quiet site is less than ±0.005mm/s, andat a gain of x1 the Gecko Blast resolution is about 0.0001mm/s,or about 50 times lower than a typical monitoring site, so youshould not need to change the gain. If you do increase the gainfor higher sensitivity, the clip level will be affected as estimatedin the table (left).The Gecko SMA uses ±4V output range sensors, so to maximise the resolution of the datathe Gecko SMA will be shipped with a gain of x4, which will use 80% of the Gecko’s dynamicrange. Increasing the gain further will reduce the clip level of your SMA.Gain Clip Levelx1 ±695 mm/sx2 ±347 mm/sx4 ±174 mm/sx8 ±89 mm/sx16 ±43 mm/sx32 ±22 mm/sx64 ±11 mm/sx128 ±5.4 mm/sx256 ±2.7 mm/sx512 ±1.4 mm/s |
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