CMG-3ESPCDDigital Broadband SeismometerTechnical ManualDocument No. MAN-C3E-0002Designed and manufactured byGüralp Systems Limited3 Midas House, Call
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD5. Within the next seven seconds, press any key to bring up the disk menu.6. Key to re
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCDIn seismic vaults, instruments are often installed on piers. It is important toensure t
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCDfacing North. This can be done by rotating the base of the sensor whilstobserving it fr
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD6. Plug the grey/blue power/data cable into the ten-pin connector on theinstrument'
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCDstratify the air in the seismometer package. Position the thermalins
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD4. Pour a layer of loose, fine sand into the pit to cover the base. The typeof sand use
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCDseismometer on top of this stone. This method emulates that in step 3,but can be perfor
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCDOther installations have been attempted with the instrument encased in
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD3.6.1 Deployment1. Prepare a hole of 60 – 90 cm depth to compacted subsoil, or down tot
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD5. Carefully insert the instrument into the hole, protected by a toughp
CMG-3ESPCD Digital Broadband Seismometer ContentsTable of Contents1 Preliminary Notes...
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD12. Group the cables coming from the bag for a distance of about 1 m, andkeep them toget
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD19. Attach the sensor power cable to the battery, and wrap it in anotherplastic bag. Pl
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD7. Carry on removing soil, either with your hands or (very carefully!) withthe shovel, u
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD7. Continue filling, moistening and packing until the instrument isburie
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCDAlternatively, for more downloading options, issue the command DISKMENUfrom the digitise
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD1. Attach the disk to your computer. You can use FireWire, USB, or anyother interface su
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCDThe program will first search for non-DOS disks on all the interfaces itunderstands. I
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD10. Status streams are also saved in multiple files, but have a default length of 24 hou
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCD4 Calibrating the 3ESPCD4.1 The calibration packAll Güralp sensors are fully calibrat
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCDmechanics and electronics can be disregarded. This relationship, given interms of the
CMG-3ESPCD Digital Broadband Seismometer5.1 Configuring digitisers...
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCDMAN-C3E-0002 30 Issue B - November 2013
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCDMAN-C3E-0002 31 Issue B - November 2013
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCDIf you want to repeat the calibration to obtain more precise valu
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCD• Injecting a sinusoidal current of known amplitude and frequencyallows
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCDtogether with a suitable duration and amplitude, and click Inject now.A new data
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCD8. The script will ask you to fill in sensor calibration parameters for eachcomponent y
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCDset to the model number of your instrument and Instrument Responseshould be set to corr
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCDThe bbnoisecal script automatically performs appropriate averagingto reduce the effects
CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCD3. Repeat this measurement for several tilt angles.4. For the vertical sensor, the inpu
CMG-3ESPCD Digital Broadband Seismometer Using Scream!5 Using Scream!Scream! is a versatile seismic data visualisation program for
CMG-3ESPCD Digital Broadband Seismometer6.6.3 CENTRE...
CMG-3ESPCD Digital Broadband Seismometer Using Scream!Some of these options can also be altered in the Configuration set-up window.For more informatio
CMG-3ESPCD Digital Broadband Seismometer Using Scream!Type you set here determines which functions will be availablethrough the Scre
CMG-3ESPCD Digital Broadband Seismometer Using Scream!Güralp digitisers initially sample incoming data at a high rate (e.g. 512,000 Hzfor the DM24), w
CMG-3ESPCD Digital Broadband Seismometer Using Scream!Each combination of channel and tap has two check-boxes. The uppercheck-bo
CMG-3ESPCD Digital Broadband Seismometer Using Scream!• Z4, N4, E4 correspond to input channels Z, N, and E, output throughTap 2. A six-channel digi
CMG-3ESPCD Digital Broadband Seismometer Using Scream!There are two triggering algorithms which Güralp digitisers can use: STA/LTAand level-triggering
CMG-3ESPCD Digital Broadband Seismometer Using Scream!trigger. The Ratio column determines by what factor the STA and LTA mustdiffer for the trigger
CMG-3ESPCD Digital Broadband Seismometer Using Scream!For example, setting the STA to 1 second, the LTA to 10 seconds and the Ratioto 4 would give ris
CMG-3ESPCD Digital Broadband Seismometer Using Scream!LTA periods, together with the Ratio, without restarting the digitiser (seesect
CMG-3ESPCD Digital Broadband Seismometer Using Scream!As can be seen, the filter you choose defines the set of permissible samplerates. The spectral
CMG-3ESPCD Digital Broadband Seismometer Preliminary Notes1 Preliminary Notes1.1 Proprietary NoticeThe information in this document is proprietary t
CMG-3ESPCD Digital Broadband Seismometer Using Scream!5.1.3.2 LevelUsing the Level triggering method, a trigger is generated whenever one of theselect
CMG-3ESPCD Digital Broadband Seismometer Using Scream!The two boxes at bottom right of the Triggering pane allow the user to set thepre-trigger and po
CMG-3ESPCD Digital Broadband Seismometer Using Scream!The baud rate you choose must satisfy two conditions: •• It must be high enough to a
CMG-3ESPCD Digital Broadband Seismometer Using Scream!5.2 Controlling digitisersTo control a digitiser whilst it is running, either right-click on th
CMG-3ESPCD Digital Broadband Seismometer Using Scream!Enable GPS power cycling: If you are using a GPS unit to receive time signals,but do not experie
CMG-3ESPCD Digital Broadband Seismometer Using Scream!5.2.5 Data flowThe digitiser operates in one of several transmission modes. These modesrelate
CMG-3ESPCD Digital Broadband Seismometer Using Scream!5.2.5.1 DIRECTSyntax: DIRECTInstructs the digitiser not to use Flash memory for storage. Instea
CMG-3ESPCD Digital Broadband Seismometer Using Scream!instrument in FILING mode. This is useful, for example, in autonomousinstallations
CMG-3ESPCD Digital Broadband Seismometer Using Scream!instead. FIFO mode will consider a data block successfully transmitted onceit has received an a
CMG-3ESPCD Digital Broadband Seismometer Using Scream!Instructs the digitiser to transmit any continuous streams directly to clients asfor DIRECT mode
CMG-3ESPCD Digital Broadband Seismometer Introduction2 IntroductionThe CMG-3ESPCD is a full-featured three-axis digital seismometer consistingof th
CMG-3ESPCD Digital Broadband Seismometer Command line interface6 Command line interface6.1 IntroductionYou can connect to the internal software of t
CMG-3ESPCD Digital Broadband Seismometer Command line interfaceIf a command completes with nothing remaining on the stack, the digitiserwill show the
CMG-3ESPCD Digital Broadband Seismometer Command line interfaceTells the digitiser which kind of GPS is attached to it. The argument typecan be one
CMG-3ESPCD Digital Broadband Seismometer Command line interfaceThe AZIMUTH command only alters the digitiser's CMOS settings. You willneed to re-
CMG-3ESPCD Digital Broadband Seismometer Command line interface400 40 20 10 samples/sec400 40 samples/sec6.3.2 CONTINUOUSSyntax: tap components CONTIN
CMG-3ESPCD Digital Broadband Seismometer Command line interface• tap 4 will output all four components ( 1 + 2 + 4 + 8 = 15).To set triggered output s
CMG-3ESPCD Digital Broadband Seismometer Command line interfacewill calculate short-term averages for 1 second of the Z and N components,and 2 second
CMG-3ESPCD Digital Broadband Seismometer Command line interfacefor some time, all triggering components must fall below the threshold beforethe trigge
CMG-3ESPCD Digital Broadband Seismometer Command line interfaceThe arguments freq-or-period and unit together determine the frequencyof the calibratio
CMG-3ESPCD Digital Broadband Seismometer Command line interfacenumber generator produces true white noise over the entire passband, as
CMG-3ESPCD Digital Broadband Seismometer Introductionport or to a Güralp Systems data module using the cable supplied. Thedigitiser
CMG-3ESPCD Digital Broadband Seismometer Command line interfaceBecause of the way FORTH works, you can insert MINUTE commands intoSQUAREWAVE, SINEWA
CMG-3ESPCD Digital Broadband Seismometer Command line interface6.6.4 RE-BOOTSyntax: RE-BOOT (interactive)Causes the digitiser to reset after a delay o
CMG-3ESPCD Digital Broadband Seismometer Command line interface• the current position of the read pointer,• the stream and time-stamp of the latest da
CMG-3ESPCD Digital Broadband Seismometer Command line interfacefirst; the digitiser will only transmit the next block when it re
CMG-3ESPCD Digital Broadband Seismometer Command line interfacecomponent letter (N) and a tap number (1). Unlike most FORTH commands,the stream-id pa
CMG-3ESPCD Digital Broadband Seismometer Command line interface6.7.15 GOSyntax: GOCloses terminal mode, and begins any download that you have set up.
CMG-3ESPCD Digital Broadband Seismometer Command line interfaceDisk Options :- (A) save All data (N) save New data (S) save Selected time window (D) D
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCD7 Inside the 3ESPCD7.1 Inside the 3ESPCD7.1.1 The sensorsThe horizontal and vertical senso
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCDmotors. It responds to commands sent on three input lines by grounding for0.2 – 7 seconds.
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCDto one or other side. With the horizontal bases tilted, gravity will keep themasses press
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD3 Installing the 3ESPCD3.1 First encounters3.1.1 UnpackingThe 3ESPCD seismometer is de
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCD4. The N/S sensor base is tilted to its level position. This process takesrather longer. At
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCD1. The BUSY LED pulses to indicate that it is centring the Z component.Each pulse corresp
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCDForce feedback seismometers of this type rely on the assumption that the forcetransducer pro
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCDThis arrangement results in two poles at specified frequencies. The velocityresponse of a c
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCD7.1.3.3 ComparisonsThe figures below plot the comparative response of a conventional velocit
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCD7.2 Inside the DM247.2.1 ArchitectureInternally, DM24 digitisers are structured as shown in
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCDsecond, triggered by timing signals from the ARM processor. The DSP cancontrol all 5 ADCs
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCD7.2.2 Updating firmware with an EAMThe simplest way to update the digitiser firmware is by u
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCDCheck that there is two-way communication with the digitiser by pressingEnter. The digitise
CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCDNavigate through the directories on your computer and select the file to beuploaded, or type
CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD• Do not kink or walk on the data cable (especially on rough surfacessuch as gravel), no
CMG-3ESPCD Digital Broadband Seismometer Appendix A - Connector pin-outs8 Appendix A - Connector pin-outs8.1 GPS portThis is a standard 10-p
CMG-3ESPCD Digital Broadband Seismometer Appendix A - Connector pin-outsWiring details for the compatible socket,***-12-10S, as seen f
CMG-3ESPCD Digital Broadband Seismometer Appendix A - Connector pin-outs8.2 DATA OUT portThis is a standard 10-pin “mil-spec” plug,confor
CMG-3ESPCD Digital Broadband Seismometer Appendix A - Connector pin-outs8.3 FIREWIRE portThis is a standard 6-pin “mil-spec” plug,conform
CMG-3ESPCD Digital Broadband Seismometer Appendix A - Connector pin-outs8.4 AUXILIARY port (optional)This is a standard 19-pin “mil-spec”
CMG-3ESPCD Digital Broadband Seismometer Appendix B - Sensor Specifications9 Appendix B - Sensor SpecificationsHybrid sensors Velocity output bandwid
CMG-3ESPCD Digital Broadband Seismometer Appendix C - Digitiser specifications10 Appendix C - Digitiser specificationsSeismic channels Number 4Format
CMG-3ESPCD Digital Broadband Seismometer Appendix C - Digitiser specificationsAbsolute accuracy 0.5% standard (0.1% optional)Type 5th-order, single-bi
CMG-3ESPCD Digital Broadband Seismometer Revision History11 Revision HistoryA 5 November 2005 Initial documentB 14 November, 2013 Major rewriteMAN-C3
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