Gecko Compact Product User Manual
Also see for Blast: Product user manual
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Contents
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13An new setting introduced in firmware version 4.1 allows manual control of a high pass filteron the sensor input. This enables a simple circuit that removes the DC offset from sensorsby introducing a low order high pass frequency filter. For most sensors, it is best to leavethis Input setting as “DC Offset”, but if you are using an IEPE sensor or have a sensor thathas a large DC offset, set the Input to “Filtered” to enable the filter which will slowly bringthe signal level down to zero. Do not enable this for long period or broadbandseismometers.An example of where this Input Filter is important is with the White Industrial Geophones,which have a signal output between 0V to +5V, where the zero level normally sits at +2.5V.In this case, much of the -20V to +20V input range of the Gecko is wasted. Running theGecko’s Input Amplifier at x4 would effectively stretch the 0-5V to 0-20V, but you wouldstill only be using the upper half of the Gecko’s dynamic range. By enabling the Input Filter,the zero level of 2.5V would be brought down to 0V, so the output signal would be -2.5V to+2.5V. This allows you to use an Input Amplifier setting of x8 to stretch the sensor’s outputfrom -20V to +20V, using the full dynamic range of the Gecko’s 24-bit resolution.Sensor Serial No.A 20-character field is available to record your sensor’s serial number. This information isstored in the station status text file for future reference. Upper and lower case letters,numbers, and some special characters are available.Mass Lock & UnlockGuralp 3-series seismometers have motorised mass controllers that allow the delicatesensor components to be locked in place for transport and unlocked after installation. UseSensor Lock before moving a sensor (this takes just a few seconds), or Sensor Unlockwhen the sensor is in place and ready to start monitoring, or to re-centre the masses.Issuing this command simply connects one of two pins on the sensor connector to Groundfor 5 seconds, so the feature could be used for other purposes if required.External 1D SensorIf you have a 4-channel Gecko Compact, Rugged, Blast or SMA, you can set up your 1Dsensor in a similar way to the 3D sensor. Simply select a sensor from the list and optionallyre-enter the menu to customise its name, units and sensitivity. No other settings areavailable for this channel.1D SensorSensor Name> Type: PressureSensitivitySet the sensor serial number using the only other menu option.The SIG+, SIG- & Input settings of the 1D sensor are the same as set for the 3D sensor. |
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