Guralp-systems CMG-6T Manual de usuario

CMG-6TTriaxial Broadband SeismometerOperator's GuidePart No. MAN-T60-0001Designed and manufactured byGüralp Systems Limited3 Midas House, Calleva

CMG-6TYou will need access to a PC with a 9-pin RS232 port, and a 12 V power source.1. Install Scream! on your PC and run it.2. Connect the GPS receiv

Operator's Guide6. Each data stream has a Stream ID, a six-character string unique to it. Stream IDs normally identify the instrument, component

CMG-6T• instruments may need to be deployed rapidly, perhaps to monitor the activity of a volcano showing signs of rejuvenation, or to

Operator's Guide1. Unpack the sensor from its container, saving the shipping boxes for later transportation.2. Prepare the mounting surface, whic

CMG-6T7. The feet are mounted on screw threads. To adjust the height of a foot, turn the brass locking nut anticlockwise to loosen it, and rotate the

Operator's Guidethermal insulation carefully so that it does not touch the sensor package.12.Ensure that the sensor cable is loose

CMG-6T1. Prepare a hole of 60 – 90 cm depth to compacted subsoil, or down to the bedrock if possible.2. On granite or other hard bedrock, use an angle

Operator's Guideperformance of the instrument. There is also no need to mix concrete or to wait for it to set.5. Alternatively, if time allows

CMG-6T2.9 Other installation methodsThe recommended installation methods have been extensively tested in a wide range of situations. However, past p

Operator's GuideFinally, many pit installations have a large space around the seismometer, covered with a wooden roof. Large air-filled cavitie

CMG-6TTable of Contents1 Introduction...31

CMG-6T3 Calibrating the CMG-6T3.1 The calibration packAll Güralp sensors are fully calibrated before they leave the factory. Both absolute and relat

Operator's Guide3.2 Poles and zeroesMost users of seismometers find it convenient to consider the sensor as a “black box”, which produces an out

CMG-6T3.3 Frequency response curvesThe frequency response of each component of the 6T is described in the normalised amplitude and phase plots provid

Operator's Guide3.5 Calibration methodsVelocity sensors such as the 6T are not sensitive to constant DC levels, either as a result of their desi

CMG-6Tshould appear in Scream!'s main window containing the returned calibration signal.3. Open a Waveview window on the calib

Operator's Guide8. The script will ask you to fill in sensor calibration parameters for each component you have selected.Most data can be found o

CMG-6TThe accuracy of the results depends on the amount of data you have selected, and its sample rate. To obtain good-quality resul

Operator's Guide3.7 The coil constantThe feedback coil constant K is measured at the time of manufacture, and printed on the calibration sheet.

CMG-6T4 Connector pin-outs4.1 Instrument, HCU RECORDER and SENSOR connectorsThis is a standard 26-pin “mil-spec” plug, conforming to MIL-DTL-

Operator's Guide4.2 Breakout box and HCU power connectorThis is a standard 10-pin “mil-spec” plug, conforming to MIL-DTL-26482 (forme

Operator's Guide1 IntroductionThe CMG-6T is an ultra-lightweight seismometer consisting of three sensors in a sealed case, which can

CMG-6T5 SpecificationsVelocity output bandwidth 10s - 100 Hz (standard),30s - 100 Hz (optional) or1s - 100 Hz (model CMG-6T-1)Velocity output sensiti

Operator's Guide6 Revision history2010-09-23 A New document2011-07-19 B Corrected diagram showing offset trim-pot locationsJuly 2011 31

CMG-6TThe 6T has a rugged, waterproof, lightweight aluminium design for ease of installation. The robust sensor elements are designed so that no mech

Operator's Guide2 First Encounters2.1 Handling notesAlthough the 6T has a rugged design, it is still a sensitive instrument, and can be damaged

CMG-6T• a 26-way bayonet plug for data and power;• a pressure-release cap;• a cover-plate for the output offset adjustment potentiometers;• a spirit l

Operator's Guidepositions whilst you adjust the offsets manually. If you prefer, you can use the equivalent switch on a Hand-held Control Unit (

CMG-6T2.4 Centring (zeroing) the instrumentFor optimal operation, the instrument's masses should be at their centre positions in the

Operator's Guide7. Adjust the relevant potentiometer until the signal meter reads zero.2.4.1 Remote centring optionFor instruments fitted w