Guralp-systems CMG-40T Manual do Utilizador

CMG-40TTriaxial Broadband SeismometerOperator's guidePart No. MAN-040-0001Designed and manufactured byGüralp Systems Limited3 Midas House, Callev

CMG-40Ta DM24, you can do this by sending a CENTRE command. If you are using a Handheld Control Unit, you should select 1 SEC VEL from the Velocity Se

Operator's guide6. Repeat steps 2 – 5 for the north/south and east/west components.Adjusting the mass position offsets with a Handheld Control Un

CMG-40T3. Using an Allen key, remove the screws holding the digitizer module onto the sensor.4. Place a flat-head screwdriver in the notches provided,

Operator's guide 6. Attach a Handheld Control Unit and adapter cable to the ribbon connector, and power up the sensor through

CMG-40TSystems; otherwise, you can use the casing of the sensor itself as a support.The steel sensor housing can be removed with an Allen key.3. Whils

Operator's guideIn temporary installations, environmental factors are also important. The sensor needs to be well protected against• fluctuations

CMG-40T3 Installing the 40T3.1 Installing in vaultsThe 40T is a sensitive instrument designed to measure extremely small movements

Operator's guidethe pier, so that nearby vibrations are not transmitted to the sensor.A high-quality seismic vault can be incorporated into the c

CMG-40TOther considerations• The sensor and cables should be situated well away from other electical cables and appliances. Stray radiation from these

Operator's guide3.2 Installing in pitsFor outdoor installations, high-quality results can be obtained by constructing a seismic pit.Depending on

CMG-40TTable of Contents1 Introduction...

CMG-40T4. Pour a layer of loose, fine sand into the pit to cover the base. The type of sand used for children's sand-pits is ideal, since the gra

Operator's guideIn other installations, tape the box down to the surface to exclude draughts.9. Alternatively, if a box is not available, co

CMG-40T Again, this method produces inferior bonding to the instrument, and moisture becomes trapped between the hard surfaces. We recommend the use o

Operator's guide4 Calibrating the 40T4.1 The calibration packAll Güralp sensors are fully calibrated before they leave the factory. Both absolut

CMG-40TPoles and zeroesMost users of seismometers find it convenient to consider the sensor as a “black box”, which produces an output signal V from a

Operator's guideFrequency response curvesThe frequency response of each component of the 40T is described in the normalised amplitude and phase p

CMG-40T4.2 Calibration methodsVelocity sensors such as the 40T are not sensitive to constant DC levels, either as a result of their design or because

Operator's guide2. Select the calibration channel corresponding to the instrument, and choose Broadband Noise. Select the component

CMG-40T5. If you need to scale one, but not another, of the traces, right-click on the trace and select Scale... You can then type in a suitable scal

Operator's guideexecutable (scream.exe), Scream! will look there for suitable calibration values. A sample calvals.txt is supplied

Operator's guideAppendix A.1 Output port and breakout box RECORDER connector...32Appendix A.2 Output port and breako

CMG-40TSensor response codesSensor Sensor type code Units (V/A)CMG-5T or 5TD, DC – 100 Hz responseCMG-5_100HZ ACMG-40T-1 or 6T-1, 1 s – 100 Hz respons

Operator's guidemay need to increase R by adding further resistors to the circuit.4.5 The coil constantThe feedback coil constant K is measured

CMG-40TAppendix A Connector pinoutsAppendix A.1 Output port and breakout box RECORDER connectorModels with a 26-pin mil-spec plug (02E-16-26P) have t

Operator's guidesensors are given in the next section.Pin R, Calibration enable, is equivalent to the vertical calibration enable line on a CMG-3

CMG-40TX Vertical centring motor (remote centring option)Y Motor return (remote centring option)Z High gain velocity –ve, N/S channel a High gain velo

Operator's guideAppendix B SpecificationsOutputs and responseSensitivity2 × 160 V/m/s or 2 × 400 V/m/sSensitivity (optional high gain outputs)2 ×

CMG-40T1 IntroductionThe CMG-40T is an ultra-lightweight seismometer consisting of three sensors in a sealed case, which can measure the north/south,

Operator's guide1.1 Response optionsThe 40T can be supplied with a response which is flat to velocity from 50 Hz to any of 0.1 Hz (10 s), 0.050 H

CMG-40T2 First encounters2.1 Handling notesAlthough the 40T has a rugged design, it is still a sensitive instrument, and can be damaged if mishandled

Operator's guideThe breakout box also provides a standard Güralp power connector on a 10-pin mil-spec plug. The 40T draws a nominal current of 48

CMG-40TSignal meterThe upper section of the HCU contains a simple voltmeter for monitoring various signals from the instrument.• To monitor the low-ga

Operator's guideCalibrationYou can calibrate a 40T sensor through the HCU by connecting a signal generator across the yellow and green C