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MAN-SWA-0001 Issue L - Scream User's Guide

1. Enter the new scale factor and click ok You can scale whole instruments at a time by ticking the Copy to all components in this window box This overrides any previous scale factor active for those streams If you have configured Scream to scale streams to physical units this box will display the scale factor Scream is using If you entered a different scale factor it will override the factor Scream has chosen To return to physical units in the scaling box enter the word auto You can also apply relative scaling by entering and operators For example entering a scaling of 2 will double the existing scale factor 4 2 4 Viewing offsets ranges and averages To see the range and average value for a stream right click on it and select Details A small window will appear beside the stream giving the current offset mean maximum and minimum values for the data in the window together with the Diff difference between minimum and maximum values The values are scaled according to the current scale factor for the stream or to any physical unit you have selected To alter the offset of a stream type a new value in counts into the Offset box and press ENTER You can do this even if the stream is locked The offset is changed for the current Waveview window only If you move a Waveview window all its Details windows will move with it You can change their relative position by dragging the title bar of each Details wi
2. 3 1 Serial ports 1 Select File gt Setup If the Com Ports tab is not visible bring it to the front If you are running Scream for the first time this window will automatically appear together with a short tutorial Display Print Stream Mapping EMail Com Forts Recording Files Event Log Fort Baud Aate AutoBaud ACKs ERAF Ax T 0 9200 v e Ww 200 August 2015 11 Scream 4 5 2 The serial ports available to Scream are listed in the table Identify each port and the instrument connected to it If you are using Microsoft Windows the Port number corresponds to the COMn number of the serial port If you are using Linux Port numbers 1 64 refer to the built in serial ports dev ttyS0O dev ttyS63 Ports 65 and above refer to USB connected serial ports beginning dev ttyUSBO A port may not be listed if it is not installed suitable drivers are not available or if another program is using it Scream scans your computer for new ports each time you open the Setup window To make Scream scan the ports again click the Port column heading 3 Configure each port according to the settings of the instruments connected to them Baud Rate The speed of the serial link to the instrument The current digitiser product range defaults to 38 400 baud Older 3 channel G ralp digitisers default to a speed of 9 600 baud 6 channel digitisers use 19 200 baud EAM units use a baud rate of 115 20
3. FReset flash Data is transmitted on the AS232 Records to flash in accordance output in real time Ho intemal with the chosen mode until the storage is used and only a small flash memory is full When this transmit buffer is available happens the made iz switched to Direct and no more data iz recorded to flash The user must either use teset flash or change the buffering mode to resume flash recording Oldest O 371 Replay O 371 Write OD 64512 Auto Riefresh To choose a transmission or buffering mode choose options from the Transmission Mode or Buffering drop down menus and click _ w e An explanation of the chosen mode is displayed beneath each menu The following sections also explain the transmission modes available The Buffering legend also displays the amount of Flash memory present in your digitiser To clear the Flash memory of the digitiser click Fesetflash You will be asked for confirmation before the memory is cleared At the bottom of the tab is a line describing the current state of the digitiser s memory pointers You can use this line to check that data are being written into memory Click Auto Refresh to make the line update automatically 8 5 1 DIRECT Instructs the digitiser not to use Flash memory for storage Instead all data are transmitted directly to clients An instrument in DIRECT mode still honours the GCF Block Recovery Protocol a temporary RAM buffer alway
4. displayed are the baud rates currently used for each channel and for the data link For more information on status streams and GPS see Section 6 2 on page 66 If you View a selection which includes both status and data streams the status streams will be collected together and displayed in a tabbed Status window whilst the data streams will appear in a single Waveview window 3 Connecting to instruments Digitiser configuration and other common operations can be performed from Scream by right clicking on the digitiser in the source tree and selecting Configure or Control See Chapter 7 on page 76 and Chapter 8 on page 89 for more information Scream also allows you to access the serial terminal of any connected digitiser and issue commands directly by right clicking on it and selecting Terminal See Section 6 1 on page 63 for more information about the serial terminal An instrument may connected to Scream through a series of other units NAMs EAMs DCMs etc Scream will negotiate with each unit in turn to reach the instrument you are interested in However the process may take a little time Right clicking on a digitiser and selecting Triggers brings up a window describing all the digitiser triggers that have been detected This window can also be reached from the Summary window see section 6 3 on page 70 for more information 3 8 Calibration data Scream can display data streams from displacement
5. No other action is necessary If your server is behind a firewall you will need to unblock the UDP port at the server side to receive these requests To push data to a particular client e Switch to the My Server pane e Tick the Transmit data from local Com Ports box 56 Issue L User guide Right click anywhere in the Clients list box and select Add Enter the IP address or DNS name and port number on which the server is waiting for requests separated by a colon e g 192 168 42 98 1567 You can add any number of clients including broadcast addresses and multicast groups If you want to broadcast or multicast UDP packets you should obtain suitable addresses from your network administrator To broadcast to all connected computers use the IP address ZOOL O OGD E AELE To restrict broadcasts to a particular subnet use the broadcast address for that subnet for example 192 168 60 255 1567 will broadcast data on port 1567 to all clients on a 192 168 60 0 24 subnet i e those with IP addresses beginning 192 168 60 To send data to all instances of Scream in a multicast group use a multicast IP address The address range from 239 255 0 0 to 239 255 255 255 is available for local networks and that from 239 192 0 0 to 239 195 255 255 for organisation level networks Most other multicast addresses on the Internet must be specially registered The server will automatically start transmitting To send data to anoth
6. Scream 4 5 Seismic Monitoring Software User guide Part No MAN SWA 0001 Designed and manufactured by G ralp Systems Limited 3 Midas House Calleva Park Aldermaston RG7 8EA England Proprietary Notice The information in this manual is proprietary to G ralp Systems Limited and may not be copied or distributed outside the approved recipient s organisation without the approval of G ralp Systems Limited G ralp Systems Limited shall not be liable for technical or editorial errors or omissions made herein nor for incidental or consequential damages resulting from the furnishing performance or usage of this material Issue L 2015 08 05 Scream 4 5 Table of Contents TOCOU Oeean merc pmerer re E anny eee tern sien error rer errr errr O enn errr ry 6 1 1 Scream as a real time application ccccceeccccsessecccceeecccseeeecesseuseaesessuseneees 6 LA Dia CMOS Tea UIT eS ccssnancucatevasivadasasionsennmnus A E 7 Te VIC WISER COM MOU all O kiea a A aeons 7 Deo INC LV OD TING ceina inate viata asaasduneaaucala has ia a RUNS aa 7 tiA kRecordine and Tepla Yonsei a T 7 12 Scream as a data VIEWe sussa n E 8 2 Installation and Configuration eeessssseessssscecsseseccssssscccssssscossssecesseosssosesesseesseo 9 ZA instalation on Windowsni ie an E A N E 9 2 2 IMS Call avOM on Unk OM LINUX erenn a E O T a 9 22 A Josta laton moman RPM Orde Doeriinnirnion n 9 22 2 Installaiion from a tar gz archi Ver
7. User guide 6 3 5 Triggers This column records the number of times the digitiser has sent a trigger status message since Scream was started New triggers are coloured in green when you Reset window the green shading will disappear but the number will remain Double clicking on a column entry opens a window with details of the trigger events End 200 11 26 200 45 2005 11 29 11 26 54 2005 11 29 11 27 43 2005 11 29 13 07 52 2005 11 29 13 08 38 2005 11 29 13 09 58 2005 11 29 13 10 48 2005 11 29 13 12 40 2005 11 29 13 13 37 Event Trigger on Stream 53 7 24 2005 11 29 13 12 40 Event Trigger on Stream 53 N4 2005 11 29 13 12 40 Event Trigger on Stream 53 E4 2005 11 29 13 12 40 Event Trigger on Stream 537 74 2005 11 29 13 12 42 Event Tigger on Stream 53 7 E4 2005 11 29 13 12 42 End of Tigger 2005 11 29 13 13 37 The top half of the window lists all the trigger events with information extracted from each trigger s status message The full status message is reported in the lower half Double clicking on an entry in the table or selecting it and pressing ENTER opens a paused Waveview window containing all the streams from the digitiser which triggered for the time period of the trigger This time period is marked with the Time Cursors to show the duration of the event If you have instructed the digitiser to record pre or po
8. 0 05 0 45 Bandwidth 2 Hz 20 90 10 45 2 22 5 4 18 2 5 11 25 2 9 5 22 5 2 5 11 25 2 9 1 4 5 0 8 3 6 0 5 2 25 0 4 1 8 0 2 0 9 12 5 11 25 1 4 5 0 5 2 25 0 4 1 8 0 2 0 9 0 1 0 45 Bandwidth 5 Hz 90 90 25 45 12 5 22 5 10 18 6 25 11 25 5 9 12 5 22 5 6 25 11 25 5 9 2 5 4 5 2 3 6 1 25 2 20 1 1 8 0 5 0 9 6 25 11 25 2 5 4 5 1 25 2 25 1 1 8 0 5 0 9 0 25 0 45 Issue L User guide As can be seen the filter you choose defines the set of permissible sample rates 7 3 2 Level Using the Level triggering method a trigger is generated whenever one of the ticked components reaches a certain level above the baseline You can select which tap is monitored from the Data source drop down menu and the channel s to be considered from the Channel column of the table The values in the Level column are the number of counts above the baseline that channel must reach before a trigger is generated As with the STA LTA method the values of the Level will often be the same for all ticked channels If you want to use different values for some channels you should clear the Common values check box before altering them Once you have enabled the Level triggering method on a particular channel you can use the Control window to change the level at which the system triggers without restarting the digitiser see Chapter 8 on page 89 If
9. Scream 4 5 Sensor CMG 3T or 3ESP 120 s 50 Hz response CMG 3T 360 s 50 Hz response CMG 3TB or 3V 3ESP borehole 30 s 50 Hz response CMG 3TB or 3V 3ESP borehole 100 s 50 Hz response CMG 3TB or 3V 3ESP borehole 120 s 50 Hz response CMG 3TB or 3V 3ESP borehole 360 s 50 Hz response CMG 3TB or 3V 3ESP borehole 360 s 100 Hz response Sensor type code CMG 3 1208S 50HZ CMG 3 360S 50HZ CMG 3B 30S 50HZ CMG 3B 100S 50HZ CMG 3B 120S 50HZ CMG 3B 360S 50HZ CMG 3B 360S 100HZ Some English descriptions are also accepted velocity 100Hz acceleration but this is not a free format parsed field Units V A e g 120s To set the sensitivity or gain of the sensor components include the line G vertical sensitivity N S sensitivity E W sensitivity These values are given on the sensor calibration sheet For velocity sensors they are given in units of V m s V ms The gain of an accelerometer is expressed in V m s V ms Because G ralp Systems sensors and digitisers use differential inputs and outputs the sensitivity is quoted as 2 x single ended sensitivity on the calibration sheet To set the coil constants of the sensor components include the line COILCONST vertical constant N S constant E W constant These values are given on the sensor calibration sheet To set the local acceleration due to gravity include the line
10. Stream ID 5TO S5NO2E4 Date Code 201 011725 19 03 56 000 Decimation Indes 10 2 Sample rate 100 O O00 Compression 32 bt 32 0 Number of Records 200 First Sample value 908 RIC Calculated 1248 1248 Ckeum Calculated For4 For4 If ALL is selected as the Source at the top of this window details of every incoming data block will be shown as they arrive You can narrow the selection to a particular source using the drop down menu Scream makes a number of validity checks for incoming blocks Any suspect fields are shown in red in the ViewInfo window The first three fields come from the transport header which is added to each GCF block to aid with data transmission Block ID character Must be a G for GCF format blocks 7 4 Issue L User guide Block Number An incrementing counter modulo 256 i e 255 1 0 for blocks from a data source This box reports the Block Number for every incoming block so this value will not appear sequential if you are using several sources Unless the field turns red the value is what Scream expected Block Size The size in bytes of the GCF block following not including transport information The remaining fields constitute the information available from the GCF block s internal header and mostly duplicate the information available in the stream list The following additional information is available Decimation Index A reserved field in older impleme
11. User guide 8 5 4 DUAL continuous streams triggered streams Flash storage Instructs the digitiser to transmit any continuous streams directly to clients as for DIRECT mode but to store triggered data into Flash storage as for FILING mode If you choose DUAL mode but do not select any continuous streams for output the instrument will send heartbeat messages as for FILING mode Scream can pick these up and download new data as necessary 8 5 5 FIFO First In First Out Flash storage not acknowledged Instructs the digitiser to begin writing blocks to Flash memory as for FILING mode but also to transmit data to clients Data are transmitted in strict order oldest first the digitiser will only transmit the next block when it receives an explicit acknowledgement of the previous block If the communications link is only marginally faster than the data rate it will take some time to catch up with the real time data after an outage If you want data to be transmitted in real time where possible but are worried about possible breaks in communication you should use ADAPTIVE mode instead FIFO mode will consider a data block successfully transmitted once it has received an acknowledgement from the next device in the chain If there are several devices between you and the instrument you will need to set up the transmission mode for each device if applicable to ensure that data flow works the way you expect Like
12. each channel calibrates the corresponding axis of the instrument simply select one of the Z N S and E W check boxes to calibrate that axis Alternatively click ALL to calibrate all channels simultaneously Some instruments have only one calibration input which is applied to all three components if you have one of these instruments you should select Z to calibrate the sensor The Duration box tells the digitiser how long to maintain the calibration signal before disconnecting This avoids the system being inadvertently left in calibration mode The default is two minutes If you change this setting it will revert to the default value after one calibration invocation All G ralp digitisers can produce either sine wave or square wave step calibration signals newer models can also carry out broadband noise calibration The Sine wave calibration signal always starts and stops on the zero crossing The frequency or period is specified by the boxes at the top right Only integers between 1 and 10 may be specified for either frequency or period so to generate a 0 5 Hz signal you should select Period and set the time to 2 seconds Likewise if you require a 0 25 second period you should select Frequency and set August 2015 91 Scream 4 5 the rate to 4 Hz In this manner you can select frequencies ranging from 0 1 to 10 Hz 10 to 0 1 s periods You can specify step calibration by selecting the Square wave button The square
13. however doing this will increase the noise visible at high frequency 4 3 4 Pre sets When you are happy with your filter design Click to apply the filter to the Waveview window and close the Filter Design window Alternatively click 4p to apply the filter and leave the Filter Design window open Ticking the Auto Apply check box makes the Filter Design window apply immediately any changes you make to the filter Since applying a filter may take some time you should not tick Auto Apply if you are viewing a large amount of data To save the design in Scream s configuration file click and enter a name for the filter You can now select the filter from the drop down menu next to the Waveview window s Filter icon August 2015 47 Scream 4 5 4 4 Display options There are a number of Scream set up options which affect how Waveview windows are displayed 4 4 1 Display set up To change default display options for new Waveview windows choose File gt Setup from the main menu and click on the Display tab ea Setup Com Ports Recording Files Event Log Display Print Stream Mapping EMail Steam Buffering Status Font Buffer 60 Minutes of data Select Waveview Defaults Spectroagrarn Click Select then click on a Wave lew Window to set default 128 xl Pimels parameters Select Units Acceleration ums i Colourcoded Components i Velocity nms S Sse Displacement n
14. on DM24 digitisers the Mux channels M8 M9 and MA appear with the legends Z N S and E W Mass Position respectively as shown above 7 5 Ports The Ports pane of the Configuration set up window allows you to program the baud rate and stop bits for the digitiser s output port The baud rate you choose must satisfy two conditions It must be high enough to allow all the transmission of all data August 2015 87 Scream 4 5 generated by the digitiser at the sampling rates you have chosen For three streams of data at 100 Hz for example 9 600 baud will usually be sufficient If you wish to transmit 200 Hz data however the baud rate must be at least 19 200 kz STD SNO1 DM FW Configuration Setup System ID Output Control Triggering Mus Channels Forts W Identical TxA rates 38400 Ts s rate i Stop Bits x Cancel Help It must be low enough to fit within the operating range of the telemetry equipment you are using While modern modems often offer transfer rates up to 56 kBaud the telephone or transmission lines may not support these rates The same holds true for radio telemetry Usually the transmit and receive rates of the data port will be the same If not you may select different data rates by clearing the Identical TX RX rates check box The Stop Bits option allows you to choose whether the serial link uses one or two stop bits In most cases this can be left at one although two may b
15. velocity and acceleration sensors in physical units To be able to do this it needs to know the calibration information provided with the sensor and digitiser Newer G ralp digitisers transmit calibration information in an information block when they reboot When Scream receives an information block that it understands it automatically extracts this information and remembers it August 2015 21 Scream 4 5 You can also enter and edit calibration information manually Right click on the digitiser s icon and select Calvals A window will open with a text entry box This window lets you edit Scream s calibration values file Parameter data for instrument DEMO NTWK m Ed Parameter Data From S miin Ea eek ee t nected eked telcos r a Parameter Data To Program Files Guralp Systemes creamg Scalyvals tet P ce Fill in the text box with calibration information for your digitiser and the instrument connected to it in the format described below 22 To set the serial number of the instrument include the line Serial Nos serial number Scream cannot tell what instrument is connected to the digitiser This line is provided to help you remember which set of calibration values you have used and to provide a title for calibration graphs If you attach a different instrument to the same digitiser you will need to enter new calibration values to reflect the new instrument To set the sensitivity of
16. 37 04 WSACleanup success 2004 02 24 14 37 04 CMD GCFNOSY to 127 0 0 1 1567 2004 02 24 14 38 04 Removed Client 127 0 0 1 1567 Allow remote access to Com ports Transmit data from local Com Ports 200 sps transmitted block limit Port used for all network communications 1567 Scream uses a single local port to communicate with all servers and clients You can change the number of this port by editing the Port used for all network communications box You may need to do this if you want to run several instances of Scream on the same computer 5 1 My Client The standard mode of transmission in Scream uses UDP Blocks of data are received in UDP packets which are shown in the Block Rx pane UDP does not guarantee that data will be successfully received If data are lost and subsequently recovered a diagnostic message will appear in the Control pane Scream has two methods for serving data In the first Scream keeps a list of clients which need to be provided with data This method is known as server push Server Heme Client Server firewall firewall Client UDP data August 2015 53 Scream 4 5 54 All data received on the server s serial ports will be sent to these clients automatically On the client side to begin receiving data you should simply tick the Receive Data box on the My Client tab No other action is necessary If your client is behind a firewall you will need to unblock the UDP port at th
17. 4 2 on page 49 otherwise the same as T The specifiers MM DD HH NN SS RRR JJJ WI TTTTTT and EEEE are the same as their single letter counterparts but they are padded with zeros or underscores to a constant length YY can also be used for a 2 digit abbreviation of the year e g 03 for 2003 and MMM for a 3 letter month name jan feb etc Any other letters including lower case letters in the file name will be left as they are so you can add constant descriptions or field separators as you wish Owing to operating system limitations you cannot use any of the punctuation marks lt gt in file names You can however create directory structures by using the 104 Issue L User guide back slash character under Windows or the solidus under Linux For example T YYYY _MM_DD HHhNNmSSs_ will give file names like dmz UII 10 OS70 7 SsomZ 0s You should always ensure that files are given unique names Scream writes each stream separately If it finds that it cannot write to a file because it is already open for another stream the write will fail and data will not be recorded Scream can record data in many formats Some file formats such as gcf and MiniSEED divide their internal data into blocks each of which has a time stamp Such formats can store streams which includes gaps Most other formats are not block structured and only have a single time stamped header at the start of the file If S
18. 5 Ticking Force Size and filling in an image width and height in the two boxes that appear forces the Waveview window to have the size that you specified Every image will also have this size Whilst Force Size is active you cannot resize the window However you can still obscure it with other windows or move it partially off the screen August 2015 121 Scream 4 5 6 Ticking Null before capture zeroes all unlocked streams immediately before taking the screen shot equivalent to clicking the Zero Streams icon Ticking Auto Scale before capture sets the scale factor for all unlocked streams so that each trace just fits within its lane If you do not Save to File or Execute Command you can still Null or Auto Scale before capture this can be a useful way of keeping traces within a Waveview window over long periods even if you do not need screen shots The Null and Auto Scale before capture cause the Waveview window to be redrawn immediately before a screen shot is taken If the window includes a spectrogram this will be lost If you need to save screen shots including spectrograms clear these two options Screen shots are bitmaps best for publishing on the Web or another low resolution medium If you intend to print the traces later consider saving them in vector format by using Auto Print and setting your default printer to Print to file or a PDF generator such as Adobe Distiller if you have one 10 2 Continuous
19. 5 SECs wo mi Dre Secs oo a a a T oh m 250 0 0001 Hz 0 001 Hz 0 01 Hz 0 1 Hz 10000 secs 1000 secs 100 secs 10 secs Log Auto Apply 2 sp Save OF Apply Select Lowpass to switch on the low pass filter and enter the value of the corner frequency required in either the Hz or the Secs seconds box Alternatively change the corner frequency by clicking on the graph with the right mouse button If the high pass filter is active and you click to the left of the high pass corner both frequencies will be moved Change the order of the filter by entering a number in the nth Order box 42 Issue L User guide Sa Filter Design Highpass 0 03333333 tls WA DLAs mo 4 the jo o BCs io i Order EN Seos 0 cn m Magnitude dB 150 0 0001 Hz 0 001 Hz 10000 secs 1000 secs Log I l E Auto Apply 2 Spe How Apply To create a band pass filter select both Highpass and Lowpass Enter values into the text boxes or click in the graph with the left and right mouse buttons to set the two corner frequencies R Filter Design E m Eg M Highpass 0 03333333 07 Lowpass Gain dB f4 th Order 30 Secs 4 tho Secs 0 l 1 cm a Magnitude dB a1 cm 0 0001 Hz 0 001 Hz 0 01 Hz 0 1 Hz 10000 secs 1000 secs 100 secs 10 secs Log Auto Apply E spe Save OF Cancel Apply When both filters are active the individual
20. Flash memory only if data packets are not acknowledged When you come to download the saved data from such a digitiser you should clear these check boxes before connecting the digitiser Doing this will ensure that incoming data continues to be saved on the digitiser rather than transmitted to Scream Rx T O receive time out The time in seconds that Scream will wait for the sender to finish transmitting a block before assuming that it is complete If the instrument stops transmitting in the middle of a block Scream s diagnostics will detect it and request retransmission next time the instrument is on line You can tick or clear all the check boxes in a column by clicking on the column heading 4 Click 0K If any instruments are connected data streams should now begin appearing in the right hand portion of Scream s main window Another way to configure a serial port is to right click on its entry in the streams list the left hand panel in the main window and selecting Configure However you can only do this if data have already arrived through the port making it appear in the streams list From this page you can double click on the port number of an open Com port to go directly to a terminal session on that port If you want to access Scream servers on the network i e EAMs or other instances of Scream you will need to add the servers to the list using the Network Control window See Section 5 1 on page 5
21. No refine this search and Change file name or keywords Look in more locations Change whether hidden and system files are induded Start a new search 20031219 _01002z GCF gt 20050111_1200m GCF Aib 20050111_1600m GCF Ai 20050111_1200m GCF 8 20050111_1600m GCF Ai 20050111_1200m GCF Ai 20050111_1600m GCF Ab 20050111_1200m GCF Ai 20050111_1600m GCF A 20050111_16002z GCF Ai 20050111_1600z GCF Ai 20050111_16002z GCF In Folder C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System C Program Files Guralp System You can now select these files and drag them all into Scream 113 Scream 4 5 2 The main window will change to include the file s you selected Stream ID Rec Format SPS End Time Date 20031219 _01002 GCF DDOM2 No 32bit 100 02 00 00 2003 12 19 4953 Network EIMACALLAN 586Kb stream buffer PC Time UTC 16 01 16 3 Select streams from the files in Scream s main window and view them in a Waveview window 4 The Replay Control window contains controls for moving through th
22. Scream You have used an ambiguous file name format which means two streams share a file name When this error occurs Scream disables recording for that stream and displays ERR in the recording column of the main window To resume recording first remove the cause of the error then enable recording again If you have Auto Record Enable for data streams selected and you replay a recorded file Scream will suppress this error message Another application possibly another instance of Scream is using the setup file lt filename gt An instance of Scream is already running on your system and is using the referenced ini file for it s configuration You cannot run two instances of Scream using the same configuration file You should either return to the running instance or if you intended to start a second instance of Scream you need to specify a different configuration file See the i option in Section 14 1 on page 137 August 2015 141 Scream 4 5 15 Revision history 142 2015 08 04 2014 01 10 2010 11 25 2009 09 09 2009 05 21 2009 02 12 2007 01 12 2007 01 09 2006 10 12 2006 03 09 2005 12 22 2005 06 01 L 00 Ca Gal Ga e Changed ExportInfo to EXPORTINFO because Linux port is case sensitive Corrected URL for UFF specification General reformatting Added transmission mode summary Added warning about OS formatting of DFD drives Update for Scream 4 5 Restored missing graphics Cosmetic
23. UFF and other file formats On occasion you may need to convert files between the various data formats supported by Scream For example you may want Scream to record data in GCF format and convert it to UFF later to ensure that you retain all the data received from the sensors The most convenient way to convert a GCF file into UFF format is by using the command line tool gcf2asc available from G ralp Systems website at http www guralp com Once the program is installed you can convert files from a command window click on Windows Start Run and type cmd lt enter gt The command to issue is gcf2asc your gcef file gcf uff where your gcf file gcf should be replaced with the correct file name To get help on using the gcf2asc command type gcf2asc By default gcf2asc will create a file with the same name as the original but with a txt extension you may want to rename the file produced to have a uff or ufa extension Any time periods missing from the GCF file are represented by values of 2 147 483 647 the lowest possible negative number in the GCF format You should ensure that you have enough free disk space to create a UFF file before running gcf2asc ASCII files are typically around ten times larger than the equivalent GCF file 9 2 2 MiniSEED file format Scream supports recording in the IRIS MiniSEED format using the same rules for file and directory names as for GCF files see above but using th
24. Waveview windows which are already open will not change until they are refreshed e g by resizing or zooming them or by pressing i You can edit an existing mapping by double clicking on its entry in the table or by selecting it and clicking Edit To change the default colour only click the colour panel under Col in the table Com Ports Recording Files E went Log Display Print Stream Mapping EMail i Use Stream Name Mapping Input IC Mapped T ext Col To delete a stream name mapping select it and click Remove August 2015 51 Scream 4 5 52 Clicking Impot enables you to import a scream ini file from another Scream installation and extract the mappings from it This is useful when you want to use a standard set of names and colours for several Scream installations Issue L User guide 5 Networking You can use Scream to access the data from a digitiser or from another copy of Scream from anywhere on a local or remote network Once a network connection is set up Scream can act as a server to provide data to other computers running Scream or archival programs To view the currently active Scream network connections select Network Control from the Window menu of the main window 3 Network Control My Client My Server TCP server INACTIVE Params Timeout Block Tx Control 2004 02 24 14 36 33 WSAStartup success v2 0 2004 02 24 14 36 33 Added Client 127 0 0 1 1567 2004 02 24 14
25. a local port to a shared printer on the network Once you have done this you can use the mapped port name to print in continuous mode 1 Choose Start gt Run and type cmd followed by ENTER 2 Typenet use port name printer name where port name is the name of the new port to create e g LPT2 and printer name is the network share name of the printer you want to use e g Server myprinter The port name that you choose should be different from any physical port on your PC 3 The program should report The command completed successfully For more information about the net command see the Windows documentation 4 You can now use the new port name in Scream s Setup window When Scream prints in paged mode it uses your installed printer drivers and can access printers shared across a network as normal You do not need to map a local port if you only want to print a page at a time August 2015 125 Scream 4 5 11 Logging and notification 11 1 Log files As Scream receives data blocks it checks that each one is valid and self consistent Any errors it detects are highlighted in the ViewInfo window see section 6 4 on page 74 They can also be logged to disk To specify this file or to change which types of error are logged choose File gt Setup from the main menu and move to the Event Log tab Tick Enable Event log to begin a Setup Display Frint Stream Mapping EMail Com Forts Recording
26. allows you to convert data formats and launch analysis tools 1 1 Scream as a real time application When you run Scream by double clicking on its icon or by launching it from the command line it opens a main window showing all the data streams coming in Scream can listen for streams in GCF format on local serial ports or network interfaces The main window is the control centre for the whole program If you close this window Scream will quit All of Scream s functions are invoked from this window see Chapter 3 on page 11 You can view a data stream by opening a Waveview window for it Any number of Waveview windows can be opened each containing any number of streams The same stream can appear in several Waveview windows if desired Each Waveview window has its own amplitude and time scaling colour scheme and display parameters For example a data stream can be viewed simultaneously at different zoom factors in different windows different groups of data streams can be viewed simultaneously each group having the same zoom factor or an entire array can be monitored in one window using another for detailed examination of incoming data 6 Issue L User guide Waveview windows provide simple filtering capabilities allowing you to examine seismic signals in a particular frequency range of interest When more detailed analysis is required data can be passed to a range of Scream extensions with a simple selecti
27. an InfoBlock has been loaded into the digitiser then the digitiser will interpret the level values so that they are in physical units e g micro g for accelerometers For level triggering configurations it is recommended that you enable the high pass filter in the Output Control page in order to remove any DC offsets from the data 7 3 3 External triggering When a digitiser or digital sensor triggers it can transmits the fact to connected devices as well as any extra data that it has been configured to record You can configure other digitisers to respond to this signal by triggering themselves This is an option which you can specify at the time of manufacture As an example to instruct a stand alone digitiser with digital inputs to respond to triggers generated by an attached digital sensor 1 Open the Configuration set up window for the digital sensor and tick Enable External Trigger Output to make it send triggers to connected devices August 2015 85 Scream 4 5 2 UPLOAD the new configuration to the digital sensor 3 Open the Configuration set up window for the digitiser and tick Enable External Trigger Input to make it listen for triggers coming from the digital instrument and record data from attached analogue instruments when it receives one depending on its Output control configuration 4 UPLOAD the new configuration to the digitiser If a digitiser has both Enable External Trigger Output and E
28. box across the streams The selected data will be highlighted Alternatively drag with page 31 to select two streams see Paused mode on 4 When you release the mouse button a menu will pop up showing the extensions available ART Analysis Package PSD in Velocity Units PSD in Acceleration Units Sine Wave Calibration Broadband Noise Calibration Relative Orientation 5 Click on the name of the extension you want to run The standard Scream Package depending on installer includes a number of useful extensions ART Analysis Package G ralp Systems suite of tools for strong motion analysis See the separate ART documentation MAN SWA 0003 for full details of this package PSD in Velocity Units and PSD in Acceleration Units These extensions produce instant power spectral density plots of the selected time series Sine Wave Calibration Step Calibration and Broadband Noise Calibration These extensions help you to calibrate sensors using an input sinusoidal step or pseudo random noise signal These signals can be generated by G ralp Systems DM24 and CD24 digitisers allowing you to calibrate sensors quickly and easily Relative Orientation This extension applies the G ralp Blacknest correlation method to determine the orientation of an instrument usually a borehole instrument It uses coherence techniques to estimate the angle between the horizontal components of two sensors where one is r
29. can also pause the window and examine any features held in the stream buffer For full information on the features provided by Waveview windows see Chapter 4on page 27 Status streams ending 00 consist of plain text Double clicking on a status stream produces the Status window 2005 12 22 17 50 00 o s 270 drift 0 pum o2 2005 le 22 17 50 00 2 Microse conds Fast Freq error 0 2005 12 27 18 01 00 2005 12 22 17 51 00 o s 270 drift O pmm TOA 2005 12 22 17 52 00 o s 224 drift 46 pum 752 2005 12 22 17 53 00 o s 210 drift 14 pums 752 2005 12 22 17 54 00 o s 210 drift O pmm TOA 2005 12 22 17 55 00 o s 210 drift O purm TEZ 2005 le 22 17 55 00 External Supply 24 37 Temperatul 2005 12 22 17 56 00 o s 210 drift O pmm TOA 2005 12 22 17 57 00 o s 221 drift 11 pum 72 2005 12 22 17 58 00 o s 261 drift 40 pum G2 2005 12 22 17 59 00 o s 235 drift 20 pwm 752 2005 12 22 18 00 00 GPS Date Time 22 12 05 16 00 00 2005 12 22 16 00 00 o s 211 drift 24 pums 752 2005 12 22 18 00 00 Auto 3 D S s 20 11 19 268 22 2005 12 z2 18 00 00 Lat 51 241 6600N Long O01 0O9 61171 The first blocks will give the boot message from the digitiser including its software revision and the data streams selected for downloading and triggering Later blocks give information on visible GPS satellites the location of the GPS antenna and time synchronization status Also 20 Issue L User guide
30. changes the interval between heartbeat blocks You can tell Scream to download new data automatically whenever it receives a heartbeat message from an instrument in FILING mode This is useful for example in autonomous installations connected by intermittent modem links To enable this feature August 2015 95 Scream 4 5 96 1 Choose File gt Setup from Scream s main menu and navigate to the Recording pane a Setup Display Print Steam Mapping EMail Com Forts Recording Files Event Log Streams W Auto Record Enable for High Sample Rates i Auto Record Enable for Low Sample Rates M Auto Rlecord Enable for Status Streams Auto Record downloaded streams Close Files after timeout Recording Mode f Stop on Disk Full Bing Buffer Leave 50 Mb free disk space f Stream Butter Only X Cancel ff Apply Help 2 Tick Auto download on heartbeat 3 Click Using FILING mode with Auto download on heartbeat ensures that Scream receives all new data whenever it can regardless of the configuration of any devices between Scream and the instrument 8 5 3 DUPLICATE Flash storage Instructs the DM24 to transmit streams directly to clients as for DIRECT mode but also to store all data into Flash storage as for FILING mode If a client fails to acknowledge a block the digitiser does not attempt to retransmit it Heartbeat messages are not sent in DUPLICATE mode Issue L
31. filters are shown on the graph in light blue Enter a value in the Gain dB box to change the gain of the filter In the example above the overall gain of the band pass filter has been set to 10 dB This is done by applying a 5 dB gain to each of the component filters As a result the light blue traces appear 5 dB below the dark blue trace August 2015 43 Scream 4 5 44 4 3 2 Viewing spectra You can overlay the power spectra of up to two streams on the frequency graph This is intended to help you design filters for specific events by focussing on the frequencies at which the event has significantly more energy than the background noise To design a filter for a specific event 1 View the relevant stream in a Waveview window and click the Pause icon II Zoom in to a time period where the stream is quiet me WaveView S 1256 X 4b 1 H4 Ampl Cursors rryrrrrrytrrr rttytrtrtrtryrrtrrrrytririt p 19 03 19 04 1905 1908 1907 19 0 2 Holding down the shift key fim select a single stream across this quiet time range Choose Use in Filter Design from the drop down menu The Filter Design window will appear with the spectrum of the background noise overlaid Ta Filter Design Sele W Highpass 0001998319 Hz O Lowpass fO Hz Gain dB 4 thOrder 500 4206 Secs Order 10 Magnitude dB 0 0001 Hz 0 001 Hz 0 01 Hz 0 1 Hz 10000 secs 1000 secs 100 secs 10 secs Log BEAN Auto Appl
32. immediately are the type of sensor you are using GPS power cycling options the short term and long term average values for triggering but not which streams perform the trigger or which are output by it see Section 7 3 on page 80 the length of pre trigger and post trigger periods calibration signal options and Issue L User guide mass control functions Some of these options can also be altered in the Configuration set up window For more information on the Control window see Chapter 8 on page 89 7 1 System ID The System ID pane gives information about the digitiser and its internal software and allows you to change GPS timing parameters kz STD S5SN01 DM FW Configuration Setup System ID Dutput Control Triggering Mus Channels Ports System Identifier ATL Seral Number KNOT Serial Number 2 5N 02 Firmware revision y Ob b52 Sensor Type LMG 5TO Timing Source GPS NMEA Enable GPS power cycling at 1 hours X cons System Identifier and Serial Number The digitiser type is identified by its system identifier and serial number Every data and status block generated by the digitiser includes these two fields at the beginning so that the block s origin can be identified On delivery from the factory the system identifier and the serial number are set to the GSL works order number and the digitiser s serial number but any combination of letters A Z and numbers
33. in rotation as they arrive To define more specific colour defaults you can use stream mapping see below Spectrogram Alter this value to change the height of spectrograms displayed in Waveview windows in pixels When you click or y newly drawn spectrograms in all Waveview windows will use the new height Pressing f will cause a Waveview window to be redrawn as will resizing it changing the zoom factor or using other buttons on the toolbar Moving a window or obscuring it and then revealing it may or may not cause a redraw depending on your operating system Units Scream can automatically scale new WaveView windows to physical displacement velocity acceleration units using sensitivity information you provide see Section 3 8 on page 21 To enable this feature first edit the calibration values for your digitiser then select a suitable unit from the Displacement Velocity or Acceleration drop down lists Once you have done this streams from the digitiser will be scaled automatically Other instruments will default to displaying in counts A simple linear scaling algorithm is used which does not take into account the response profile of the instrument although where the instrument has a flat response in the pass band it is normally a sufficient approximation For accelerometers this is usually sufficient to be useful 4 4 2 Stream mapping You can tell Scream to look for streams with a particular Stream ID an
34. it will be showing the System pane Ei STD 5N01 DM FW Control System Triggering Calibration Data Flow Sensor Type CMG 5TD Output Unified Status packets 5N0107 Enable GPS power cycling at 1 hours om Close Sensor Type If the sensor attached to the digitiser requires mass control you can send control commands to it from the Mass Control tab see below Which functions are available on this tab depends on the Sensor Type you have set on the System tab August 2015 89 Scream 4 5 If you change the Sensor Type you may have to Apply the change close the Control window and open a new one to access the Mass Control options Output Unified Status packets Unified status packets are a binary formatted status information packet that is intended for use with CMG EAM and CMG NAM modules If your digitiser is connected directly to an EAM or NAM you should enable this option Unified status packets report GPS and channel status every second so may consume a lot of bandwidth if a digitiser is connected via some type of link other than a direct connection to an EAM Enable GPS power cycling If you are using a GPS unit to receive time signals but do not experience significant drift in the system s clock for example in a stable temperature environment you can save power by selecting Enable GPS power cycling The digitiser will power up the GPS receiver and keep it powered up until a satisfactory ti
35. its entry in the Servers list box pops up a menu with Connect and Disconnect options in place of the GCFxxxx commands Selecting Connect instructs Scream to join the multicast group with that address If the server is running data should begin appearing immediately Selecting Disconnect makes Scream leave the multicast group You can be in several multicast groups simultaneously and join or leave each one independently of the others August 2015 55 Scream 4 5 5 2 My Server Scream s server transmits data over the network via UDP To prevent network loops separate options are available to serve local data from directly connected instruments or to relay data that were received by the Client Transmit data from Network The list of clients to which Scream is currently sending data is shown in the Clients table at the top of the My Server pane Block by block details of the data being transmitted are shown in the Block Tx pane Other server operations are reported in the Control pane to its right oe Network Control Co My Client My Server Server Butter TCP server active Clients Params Timeout 127 0 0 1 1568 B None Block Tx Control oe to 25 11 2010 16 04 04 1020 Packet send req 3109385 sent 25 11 2010 18 37 36 3120974 UDP to 1 25 11 2010 16 04 04 1020 Packet send req 3109386 sent 25 11 2010 18 37 37 3120975 UDP tol2 25 11 2010 16 04 04 1020 Packet send req 3109387 sent 25 11 2
36. names with commas e g SelectionMenu art exe ART 2 0 Analysis Package myextension exe My Analysis Extension To install a MATLAB extension 1 Make sure MATLAB 5 or later is installed on your computer together with the MATLAB signal processing toolbox 2 If you have not done so register MATLAB as an automation server See the MATLAB documentation for more details 3 Place the script file in MATLAB s PATH so that MATLAB can see it 4 Make sure Scream is not running stop it if necessary and open the scream ini file in Scream s directory using a text editor 5 Add the name of the script to the SelectionMenu as detailed above When an extension is launched Scream first saves the data to a file samplesn txt in the standard temporary directory using the TEMP environment variable or tmp under Linux A _ second file scrhdr txt is saved at the same time which directs the script to the location of the data The script or program is expected to fetch the data from this file If you have problems make sure that Scream has the right permissions to create these files and that your temporary space is not full 12 2 Running extensions To export data to a Scream extension 1 Open a Waveview window on the stream or streams of interest and find the data you want to analyse 2 Click the Pause button to pause the window August 2015 131 Scream 4 5 3 Whilst holding down the shift key drag a
37. not from these to view windows or from view windows to other view windows This is because the windows are handled by different instances of the Scream program You can also drag streams within a Waveview window to reorder them If you have paused a Waveview window with the icon If you will need to drag from the panel on the left since dragging across the window will zoom in see below To the left of the stream display is a panel identifying the stream by its System ID and Stream ID or another label if you have set one see Section 4 4 2 on page 49 If the label is too long to read you can resize the panel by dragging its edge across the Waveview window You can also hide the panel this way 4 1 Window functions Above the stream display is a toolbar containing icons which act on all of the streams within the window 4 1 1 Zooming in and out To zoom in and out vertically click the vertical scale icons 16 lt at the top left of the window or use your mouse wheel The current zoom factor is shown between the icons as a ratio of pixels to counts Zooming in and out affects every stream in the window To zoom in and out horizontally click the horizontal scale icons 2 or hold down the shift key co whilst turning your mouse wheel The current zoom factor is shown between the icons in pixels per second To convert to pixels per sample divide the zoom factor by the sample rate for the stream If you have a la
38. of 0 By default the stream list is sorted in order of sample rate with the status streams at the bottom End time and Date the date and time of the most recent data as measured by the data s own time stamps These are not necessarily the latest data to arrive RIC The Reverse Integrating Constant In effect this is the value of the last sample received This is most useful for reading mass positions or other environmental streams Status streams have a RIC of N A If a stream is currently recording on Windows the option Explore Recording Folder will open a Windows Explorer window at the folder where the data are currently recorded This is useful to quickly browse to the recorded files 3 4 1 Sorting options Sorting options are available from the View gt Sort By menu Alphabetical Strict alphabetical order 0 9 then A a Z z Component Vertical components ending Zx followed by Nx and Ex components then Mux channels Mx Within a component type sort by the first four characters of the Stream ID Instrument Sort by the first four characters of the Stream ID Within an instrument sort by tap then by component 18 Issue L User guide Sample Rate Sort by sample rate highest to lowest Within a sample rate sort as Instrument Tap Sort by tap the last character of the Stream ID Within a tap sort by instrument then by component Select the Reversed option to reverse any of the
39. pixel you should zoom in to the range of interest before measuring The Ampl Cursors measure distances in counts according to the current zoom settings However if you have applied a scaling factor to an individual stream see below the Ampl Cursors do not take this scaling into account so the measured distance will no longer be in digitiser counts they will be in the scaled units of the stream To obtain the true value in counts divide the value displayed in the Ampl Cursors icon by the scale factor for that stream as displayed beneath its ID on the left hand panel If a stream is shown with a physical unit e g nm s Scream has scaled it so that the Ampl Cursors display a value in that unit To do August 2015 29 Scream 4 5 this Scream needs to know the sensitivities of your digitiser and instrument see Section 3 8 on page 21 4 1 3 Printing To print the data currently being displayed in the Waveview window click on the Print icon Scream will use the current default printer settings to print a full page view of the window using the current amplitude and time scaling filtering and other display options You can print at any time in either real time or paused mode To print the same data in black and white on a colour or grey scale printer click on the arrow beside the Print icon and select Page Print monochrome from the drop down menu Black and white output is more suitable for copying or fax
40. printout Scream includes built in drivers for printing continuously to an Epson ESC p compatible printer this includes most dot matrix printers and many others although you may need to explicitly enable this mode on your printer You can print in continuous mode from any Waveview window although only one Waveview window can be used as a print source Because Scream bypasses the printer drivers of your operating system to enable continuous mode you will need to set up the printer options manually 122 Issue L User guide 1 Choose File gt Setup to display the Setup window Choose Print kg Setup Com Ports Recording Files Event Log Display i Steam Mapping EMail Fort LPT T Resolution CFI 120x60 8 pin Print width inches 8 00 Fage Length inches 11 00 Frnt ID Labels w when Change Every Page Print Amplitude Scale w When Change Ever Page Pint Date M When Change Every Page M Cancel A ay Help This window only applies to continuous mode printing for page mode printing you should use the standard File Printer Setup window 2 Set Port to the name of the parallel port connected to the printer 3 Set Resolution to a suitable value for the printer in dots per inch DPI or pins Ensure that the mode you select is within the capabilities of the printer as Scream cannot do this automatically 4 Set Print Width to the width of the printout i
41. spectrograms or send data to Scream extensions just as you would from real time Scream See Chapter 4 on page 27 for full details of what you can do From the command line Scream can be run in viewing mode with scream view filename filename Scream cannot switch between real time mode and viewing mode If you want to load GCF files into the real time application you should use the Replay Files facility see Section 9 3 on page 112 However you can have both real time Scream and Scream viewer windows open at the same time 8 Issue L User guide 2 Installation and Configuration The Scream software is available free of charge by request to mailto scream guralp com Please specify when ordering the operating system on which you wish to run the software 2 1 Installation on Windows Scream for Windows is delivered as an installer packaged application so you will receive a single exe file Run this file and follow the instructions on screen Please see Section 2 3 on page 10 for initial configuration steps 2 2 Installation on Unix or Linux Scream for Unix Linux can be delivered as either an RPM package or a tar gz compressed archive please specify whichever is most appropriate when ordering For users of Debian GNU Linux based distributions such as Ubuntu the alien command can be used to create a deb package from the RPM 2 2 1 Installation from an RPM or deb You can normally use your pack
42. tape select File gt SCSI Tape gt Eject or press the Eject button on the tape device If you are recording data onto the tape Scream will begin buffering data internally until the tape drive is ready to accept new data and will automatically resume recording on the new tape This feature allows you to hot swap tapes directly without losing any data If no compatible tape drives are detected these menu options will be greyed out 9 4 Automatic playback If a directory called autoload is present in Scream s program directory Scream will automatically look in it for GCF data and play it into the stream buffer in real time as if it came from a local serial port The data appear under Autoload in the Files section of Scream s stream list This feature allows you to transfer real time data to Scream by merely placing files in the designated directory For example August 2015 117 Scream 4 5 If your acquisition equipment only has FTP access to the computer running Scream you can gather data into GCF files and transfer them every so often into the autoload directory where Scream will process them next time it is running or You can set up a separate script on your computer that periodically fetches GCF files from a Web server Once a file has finished playing back Scream deletes it from the autoload directory If you want to keep the data you will have to re record them from Scream into a directory that
43. the data yourself you should Duplicate the Waveview window and minimize the one that is printing so that the scale and other settings are not changed Printing will continue in the background If you attempt to Auto Print from a printer other than the default only the first printout will be sent to the other printer After this Scream will revert to the default 120 Issue L User guide 10 1 2 Automatic screen shots You can save screen shots from a Waveview window at regular intervals These can be saved to a file or used as input files for another program The Waveview window does not have to be visible for a screen shot to be taken you can minimize it 1 Click the arrow beside the Print icon amp to display a drop down menu 2 Choose Auto screenshot and tick Enable Auto Screenshot aa Auto Screenshot Options i Enable Auto Screenshat Every 5 Minutes Save to File mE Execute Command e oo Force Size Null before capture Auto Scale before capture Cancel 3 Set the time interval between screen shots in the two boxes beneath Unlike Auto Print a screen shot will be taken at this interval throughout the day 4 Enter a file name for the screen shot in Save to File If you also want Scream to run a command using this file as input enter it in the Execute Command box Screen shots are saved in PNG format so under Windows you should add png to the end of the file name
44. through The co Om and Kej av the history of typed commands This history is common to all Terminal windows so you can easily for example send the same command to several digitisers in turn To begin capturing a session in terminal mode including every command you type as well as the instrument s response right click in the Terminal window and select Capture to File All subsequent actions will be saved to the file you select Capturing stays in effect through digitiser restarts and also if you close Scream and restart it later The capture file s name is displayed in the caption of the Terminal window To send a file to a digitiser right click in the Terminal window and select Send File This can be used to read in lists of commands that you have prepared for example to set up a number of digitisers identically It is also used to update a digitiser s firmware For details on how to set up firmware transfers refer to the documentation for the relevant digitiser To close the connection close the Terminal window Scream will automatically instruct the digitiser to start transmitting data If the digitiser begins transmitting data whilst the Terminal window is still open e g because you have issued the close or go command or because of a time out the window will close automatically with the message Terminal session closed by instrument 64 Issue L User guide E Information Terminal Session close
45. to enter quiet mode EO to turn off local echo and SO 1 to turn on the auto answering facility Modem commands normally start with the attention sequence AT Scream adds this sequence automatically so you do not need to enter it in this box Some modems have dip switches which allow you to set permanent defaults for each command These can be useful for autonomous installations when you want to ensure that the modem does not enter an unrecoverable state 7 When all the settings are correct tick the Active check box and click w Apply to start polling 8 To switch off polling without losing your settings clear the Active check box If you have more than one modem attached to your computer you can set each one up with a different set of numbers and polling times You might want to do this if you want to collect data from several stations simultaneously or August 2015 61 62 Scream 4 5 using several modems allows you to reduce call charges e g you might use a cellular modem to contact installations on GSM networks and a standard PSTN modem to contact those on land lines You can have up to 99 modems collecting data simultaneously each with an unlimited number of scheduled dial up times and telephone numbers Scream will remember all the settings when you exit Issue L User guide 6 Supplementary windows Aside from the main window Waveview windows and Network control window Scream i
46. use a later tap with a lower sample rate as a trigger for output from an earlier more detailed tap 80 Issue L User guide Scream also allows you to configure each digitiser to receive triggers from other digitisers To create a new stream with a trigger open Scream s Digitiser configuration window for the relevant digitiser and click on the Output control tab In the Output control pane a tap which gives rise to a triggered stream has a tick in the lower row of its grid of check boxes You cannot configure the trigger criteria until you have selected at least one stream to be affected by the trigger Once you have decided which streams should be output when the trigger is activated you will be able to click on the Triggering button to describe the trigger condition Alternatively click on the Triggering tab at the top of the window Either action will open the Triggering pane kz STD 5SN01 DM FW Configuration Setup System ID Output Control Triggering Mux Channels Forts STAY LTA LEVEL Data Source Bandpass Filter Data Source Channel STA LTA Ratio Channel Level 0 1 10 4 0 li iv 2 0 100000 Nf 1 10 4 0 w HT 100000 E 2 10 4 0 W E 2 100000 Taj po 0 x 10000 W Common values W Common values Enable External Trigger Input Pre Trigger seconds 10 Enable External Trigger Output Post Trigger seconds 20 5 TARET There are two triggering algorithms which G ralp d
47. you specify If Scream cannot delete it it remembers the file so that it does not try and replay it again However if you exit Scream and restart Scream will replay the file if it is still there Data from the autoload directory will not be transmitted over the network 118 Issue L User guide 10 Printing options 10 1 Page printout The simplest way to print from Scream is in page mode using your operating system s printer drivers The printout reproduces the vector data visible in a single Waveview window including scaling factors filters and cursors but not spectrograms Data in the window are stretched to fill the page 1 Choose File gt Printer Setup to display a standard Printer Setup window and select the parameters of your printer and paper 2 Open a Waveview window on the streams you want to print 3 If desired pause the window and zoom in on an area of interest Make any other necessary adjustments 4 Click the Print button amp The printer will output a full page reproduction of the visible data using the amplitude and time scaling filtering and other display options that you have set Alternatively click the arrow beside the Print button and select Page Print monochrome to print the same data in black and white Black and white output is more suitable for copying or faxing Ge Note If you print to a printer which is not your computer s default Scream will revert to the defau
48. 0 by default If you do not know the baud rate of your digitiser s output port select Auto Detect from the drop down menu to have Scream attempt to detect it for you The instrument must be producing data for this to work You can set all ports to the same baud rate by clicking on the column heading and choosing a suitable value from the drop down menu If you are using Scream for real time data you will not need to change any of the remaining settings AutoBaud Once connected Scream dynamically alters its baud rate to fit with the instrument to which it is connected However this can interfere with transmission over very noisy links If you have problems clear this box ACKs Whether Scream should send Acknowledged messages to this instrument NACKs Whether Scream should send Not Acknowledged messages to this instrument when it detects a failure in transmission 12 Issue L User guide BRP Whether Scream should attempt to recover dropped blocks from the instrument using the G ralp Block Recovery Protocol You should clear this box if you are using a single direction simplex communications link If you clear all three check boxes ACKs NACKs and BRP Scream will never acknowledge data packets that it is sent This is particularly useful in situations where you need to connect to a digitiser without altering the flow of data For example a digitiser in FIFO or ADAPTIVE mode will normally save data in
49. 010 18 37 37 3120976 UDP tol2 25 11 2010 16 04 04 1020 Packet send req 3109388 sent 25 11 2010 18 37 37 3120977 UDP tol2 25 11 2010 16 04 04 1020 Packet send req 3109389 sent 25 11 2010 18 37 38 3120978 UDP to12 25 11 2010 16 04 04 1020 Packet send req 3109390 sent L 25 11 2010 18 37 38 3120979 UDP to 12 25 11 2010 16 04 04 1020 Packet send req 3109391 sent 25 11 2010 18 37 38 3120980 UDP to 127 25 11 2010 16 04 04 1020 Packet send req 3109392 sent 25 11 2010 16 04 21 Disconnected from 127 0 0 1 56798 Allow remote access to Com ports V Transmit data from local Com Ports Transmit data from Network 200 sps transmitted block limit Port used for all network communications 1567 Both server push and client pull clients are listed in this pane You can see which clients are using which method by looking in the Time out column When a pull clients requests data its time out is reset and then starts counting down toward zero Ifa pull client s time out value reaches zero Scream assumes it has stopped listening and removes it from the list On the other hand push clients do not have a time out because Scream will always try and transmit to them Thus clients using pull have a time out figure listed in this column whilst pull clients are shown with the entry None To start a server and listen for pull requests from clients tick the Transmit data from local Com Ports check box on the My Server pane
50. 0S 50HZ V GRAVITY 9 80122 25 Scream 4 5 CMG 5TD accelerometers use 1 Q calibration resistors and their coil constant is set to unity Older CMG 5TD instruments based on Mk2 digitiser hardware do not have calibration input facilities and thus the CALVPC entry is omitted For example Serial Nos T5585 VPC 7 NO Sas 207 B47 303 6 G 0 256704255 0 255 COTLCONGTS 11 1 CALRES 1 TY PE CMG 5T RES PONSE CMG 5 00HZ A GRAVITY 9 81089 For information on the file calvals txt which stores these values see section 14 2 on page 138 3 9 Other features The main menu also provides some miscellaneous facilities Choose File gt Save Program State to save Scream s configuration file immediately This file is read whenever you start Scream and any changes are written back whenever you close it Under Microsoft Windows the configuration file appears as scream ini in the c scream directory under Linux it is saved in SHOME if this variable is set otherwise the same directory as the Scream program file You can change the name and location of the configuration file with a command line option see Section 14 1 on page 137 Choose File gt Application Caption to change the title of Scream s main window This is useful if you have several copies of Scream running on the same computer e g to run multiple network services Choose View gt Stay On Top to keep Scream s main window on top of all other Scream w
51. 3 for more details August 2015 13 Scream 4 5 Scream will remember all the data sources you have specified on exit When you next open the program it will automatically try to re establish all the connections 3 2 The stream buffer Scream works by recording incoming streams into a fixed area of memory called the stream buffer All of Scream s operations work with the data in this buffer When you start Scream for the first time this buffer is empty You can add data to it either by receiving it from local serial ports connecting to Scream network servers or replaying GCF files Once the stream buffer is full Scream will start discarding the oldest data If you have not told Scream to record the incoming streams see Chapter 9 on page 101 then you will not be able to get discarded data back You can change the size of the stream buffer in the Display pane of the Setup window see Section 4 4 on page 48 If you have enabled GCF recording Scream keeps track of the files which contain data in the stream buffer and saves this information in a lst file in the current recording directory set using the Base Directory item on the Files tab of the set up dialogue When Scream is restarted it reads this file and tries to rebuild the stream buffer as it was when it was shut down Otherwise the buffer starts off empty as before 3 3 The source tree The tree in the left panel of the main window shows all th
52. 38 Ae 29 CCV OR aaae den noni E cate ora pean ua a teeuacemmnanntenneeyes 39 473 The Filter Desitin WNAWN cracina ann e AN dectetsnnitrstedalinsdceaes 40 ATP paranne leS a E TEAOR 41 a A VICWINE ODEO d ar E E E E EE 44 43 3 DISplaV Opon S sanar E N 46 A e PTOS E COE E T A E EA RE A EUNN 47 AA DiS Play ophion Sena T T OA T TEE TOT wise nuaNeens 48 da NIG ay Se OD ae nE E Ea O 48 AA 2 UPC Al Ale DOMINO niea a aa EE E EEE E ATN 49 INO LW OE KINO irra E E T N 53 DLM OB fc oy aa NA EE A OT 53 EEO PER N A E T ucenseanace a caaeane 55 DZ MUCE ClCH IS n E E conta amensacenteecericeans 55 TA MP CLV Cl sce ae venccar ties capaciec E TER AEA E T 56 Oi Se OP VCE BUO erena O EEO 59 OE Gap TOCOV EL yenirse A E 59 Do Remievine data over dial Up UKS orrira a NE OTR 59 6 Supplementary WINdOWScsssnriir e e a EE E ees 63 61 Terminal WNION S osre oaa O E TE AT O AOOO 63 6 1 1 Commu nicanne with INSITUMERIS ysciessinca nemnein tecnica onerous 63 6162 Macro COM MAING S acicessuannsssesiatconiisaaadsinsraatasensuescaisutineasannsiedteatnieaanensetes 65 Bold IIITECE COMME CEOS aces esi ietad e A E E A cane Malcaus A 65 6 2 Wieser Slavs SIPC AIINS viet cesactatesecndeasedracea tian EE tua teed teen seo eaete deel 66 Za Ca EA E AET A A E EE E A E E E E 67 6 22 Graphing stalus IN1Ornia 100 eearri T E E EO RE 69 63 Thesummay WTO WY serana aes neeieaeetetnancnateeunan 70 Spe ed BIO aean E eae eae T ere E rr ae re ere errr 71 ss 2s E OG NOM oe aes tase Seala
53. CY26EG 2010 9 17 16 06 32 Read point 1 152 GSL CYZ6NG 2010 9 22 11 52 56 Latest data 1 372 GSL C2844 2010 10 F 12 26 19 File Replay 128 GSL CYZ5EG 2010 9 17 16 06 32 131 0MB FireWire Butter The system will produce a similar status message whenever it is powered up and whenever you reboot it for example after changing its configuration 6 2 1 GPS If a GPS unit is fitted its operational status is reported on reboot and the behaviour of the time synchronisation software will also be shown From a cold start GPS will initially report No GPS time together with its last position taken from the internal backup All messages from the GPS that involve a change of its status are automatically reported Repeated status messages are not shown to avoid unnecessary clutter August 2015 67 Scream 4 5 A typical GPS status report from a DM24 digitiser looks like this Status W02294 DB9200 Normal RAM Buffer Direct DSP 56002 Firmware V 640 Six Channels Ext trigger Input enabled Output disabled Expecting Garmin NMEA GPS Continuous Data output from Tap 1 100s s 3F Chans 012345 Output Triggered Data from Tap 0 200s s 01 Chans 0 STa LTa Triggering source not selected Port 0 Rx 57600 Tx 57600 Port 1 Rx 4800 Tx 4800 Filter Sequence 53 200 100 20 Ext Supply 12 5V 02 03 2004 15 11 14 GPS Power On 2004 3 2 15 00 00 continuous Ext Supply 12 6V GPS Date Time 02 03 04 15 06 18 4 SV s expected S
54. Every stream is identified in its icon in the left hand panel For more details right click on the stream The topmost option in the menu displays the full network path to the instrument including its System ID and Stream ID EEk Colour scale Details Locked Offset Spectrogram Delete Background Colour Label Clear Window Chrl Del No Caption Duplicate Ctrl D Overlay Streams Here a stream from a digitiser with the System ID BHOLE has a mapped name of Z see Stream mapping in page 49 Right clicking on the stream shows that the true Stream ID is DA62Z2 and that it comes from a GCF file with the name daoz Z00GULL 19002 0Cr Selecting this option brings Scream s main window to the front with the digitiser and stream selected 4 2 2 Changing the appearance of streams To change the colour of a stream s trace right click on the stream in the Waveview window and choose Colour Select the colour you want to use and click You can also set up Scream to use particular colours automatically according to the name of the stream and to label them differently in the Waveview window See Section 4 4 2 on page 49 for more details August 2015 37 Scream 4 5 4 2 3 Scaling streams To scale an individual stream right click on it and select Scale E Bealine e Enter a scale factor or source streamlD for scaling iT T Copy to all BHOLE BHO5 components in this window Cancel
55. Files Event Log W Enable Event log W Block Sequence Errors W Invalid Compression Code W Suspicious System IDs W Invalid Block Duration i Invalid Time code i End Sample Mismatch W Invalid Sample Rate W Checksum Errors i User Commands W Data Discontinuities Log Files i File for each data source I Limit to 100 Kb Directory cchecream logs Browse x Cancel wi Apply Help The top section of this window lets you select the types of event to be logged Block Sequence Errors A block with an unexpected block number Blocks received over a serial data link are marked with a block number which increases by one for each new block If Scream receives a block whose number is out of sequence it generates this error Suspicious System IDs A block coming from an instrument which is reporting a System ID of zero i e blank Although the block itself is valid there may be a problem with the device from which it came Invalid Time Code A block with an out of range time stamp i e greater than 23 59 59 User Commands A command initiated by the user which affects the operation of the instrument e g locking unlocking centring calibration and configuration detection 126 Issue L User guide Invalid Compression Code A block with a compression code other than 1 2 or 4 Invalid Block Duration A block which is not a whole number of seconds long GCF blocks must contain a whole number of seconds of d
56. GRAVITY ecceleration 24 Issue L August 2015 User guide You should give this value in ms if you know it If you miss out this line Scream will use a standard average g value of 9 80665 ms When you have filled in all the values click swe Ta Parameter data for instrument DEMO N TWK E Eg Parameter Data From C Program Files Guralp Systems S cream s calval Sernal Nog T 4499 WPC 3 153 3 147 3 159 G 1010 100 1002 LOILCONS T 0 0257 5 0 07 778 0 07 4 CALYVPC 3 161 CALRES 51000 TyPE 3T RESPONSE CMG 3_1205 50H Parameter Data To Program Files Guralp Systems Scream4 Jcalvals tet Help Cancel Any WaveView windows that are open will change to show streams in physical units New WaveView windows will also use these units where possible Each digitiser System ID and serial number can have only one instrument connected to it If you have a 6 channel digitiser with two connected sensors you will need to make the digitiser announce different serial numbers for each one On newer G ralp Systems DM24 digitisers this can be done with the command SERIAL2 See the manual for your digitiser for more information 3 8 1 Examples The calibration information for a CMG 3T weak motion velocity sensor might look like the following Serial Nos T3xX99 VPCS54 153314732159 G 1010 1007 1002 COLLCONST 0 02575502 01778 0 01L774 CALVPC 3 161 CALRES 51000 TY PE CMG 3T RESPONSE CMG 3 3
57. S and time synchronization status This status information is in plain ASCII text format To see a Status window for any digitiser double click on the Stream ID xxxx00 This stream always has a reported sample rate of 0 samples per second During boot up each unit reports its model type firmware revision number its System ID and serial number This information is followed Issue L User guide by the number of resets that have occurred and the time of the latest reboot from its internal clock The following lines report the current configuration of the unit s sample rates output taps and baud rates A typical digitiser re boot status message looks like this EE Status GSL C72800 Volts Temp 2571172010 20 00 01 BRM BOOT w2 0 mgs 19 04 10 Build 09 Port O 115200 baud Port 1 38400 baud Port 38400 baud Port O Data Out Port 1 GPS Port 2 Console USE not connected LCDPort 40 ok 50 NO IZC Ack I OPort 42 ok RTModule 78 Wo Tze GSL C Y2600 CMG STD Boot Log 51 Power cycles 116 Watchdog resets Last boot 2010 11 25 11 15 42 2010 11 25 11 16 03 2010 11 25 20 00 02 WatchDog RESET 166th System Boot Guralp Systems Ltd DM FU w i06 mgs 20 05 10 Build 46 CPLD version 21 04 Check for off board Hynix Bank O Hynix 25665 O Noa Chip 296 HB Flash File Found 0 Bad Blocks mapped out 25 11 2010 20 00 05 256M6 Flash Memory Butter 1 245 Blocks Written 221 Unread 261 923 Free Oldest data 128 GSL
58. SCII variant and ufb denotes the binary variant The byte order used for the binary variant is specified in the Recording pane of the Setup window ASCII does not have byte ordering options Details for the layout of the UFF soe can be obtained from the University of Cincinnati at You can instruct Scream to record incoming data directly in UFF format To do this open the Files pane of the Setup window as above and select either UFF ASCII ufa or UFF Binary ufb in the Data format drop down menu However UFF files tend to be large and the format does not retain the full resolution of the data gathered by the sensor It is recommended that you keep the initial recording in GCF 106 Issue L User guide format and convert to UFF as required using the tools provided see below Files in UFF format must represent a contiguous period of time If a discontinuity is detected in the incoming data stream then the file which is currently recording will be closed and a new file opened with a file name and time stamp matching the start of the new file This operation will take place regardless of the options you have specified for Granularity although the Granularity options will still work For example if you specify files lasting one hour a new file will be opened on the hour every hour whether or not a discontinuity occurred during the previous hour which will have caused a new file to be opened at that point Converting to
59. SEED section on page 107 for more details The specifications you can use are sta chan wfid calib calper type segtype and commid Each specification sets the header field with the same name If you miss out a specification Scream will fill in the default value 9 2 7 SEG y file format Scream supports recording in the PASSCAL modified SEG y format sometimes called pSEG y using the same rules for file and directory names as for GCF files see above but using the extension sgy Files in SEG y format must represent a conginuous period of time Ifa discontinuity is detected in the incoming data stream then the file which is currently recording will be closed and a new file opened with a file name and time stamp matching the start of the new file This operation will take place regardless of the options you have specified for Granularity although the Granularity options will still work Before you start recording SEG y files you should ensure you have selected the correct byte order in the Recording tab of the Setup window Scream sets header fields in SEG y files as follows CHANNEL NAME The last two characters in the Stream ID e g Z2 STATION NAME The first four characters in the Stream ID SENSOR SERIAL The System ID CHANNEL NUMBER 1 for Zn streams 2 for Nn streams 3 for En streams 4 19 for the 16 Mux channels Mn adding four to the Mux channel number e g stream M8 will appear as 12 Status s
60. V O5 Elev 59 Agim 226 S N 50dB SV 07 Elev 29 Azim 053 S N 41dB SV O9 Elev 81 Aazim 088 N 44dB SV 14 Elev 24 azim 312 N 368dB Auto 3 D SV s 5 7 9 14 18 26 30 7 Lat 51 21 6521N Long 001 09 61890 Using GPS to Check Crystal 2004 3 2 15 05 33 Check 1 2004 3 2 15 09 13 0 2004 3 2 15 06 00 Missing pps Internal Clock 193 920 125 MicroSeconds Slow Freq error O e 9 Check 2 2004 3 2 15 11 13 1 Clock sync d to Reference 2004 3 2 15 07 59 gt gt 2004 3 2 15 11 13 This report shows the satellites the system has found along with their corresponding signal strengths If the system has not been moved from its previous location it should be able to find enough satellites to obtain an accurate GPS time fairly quickly if the GPS receiver has difficulty finding satellites there may be a delay of several minutes before a new message is displayed Before beginning the digitiser s internal time synchronisation software will wait for the GPS unit to report a good position fix from at least three satellites for at least six consecutive messages Messages are normally received every 10 to 20 seconds The system will then set the internal clock and re synchronise the Analogue to Digital Converters so that the data are accurately time stamped to the new reference Any data transmitted up to this point will be stamped with the time from the internal backup clock which is set to the new accurate time at the end of this process The re sy
61. aa aol nak iain ieee Sala ea 97 80 9 POLTI IE STOU eoe a A vetoes Secheucatet 97 omy oe ADAPTIVE pr E A 98 6 5 7 PranismissiOnuMOGe Suma Vaeriran 99 8 6 Bittier Memory Usib Enin E A TE 99 BOERE USEF RT CY GLE soner rset a amauta gon shialanamat nin ned Madea tien dtaiataleduiaeenas 99 2 WUE TONG P erene aa ved gun ceca vance agen E 100 9 Recordin and play Wack isiicecassisece dnautrncates n a E E A 101 Oe IRE COPING wis cavevsooavesseatiansiiecbausshcen uaa sot nessabacausan cnaduarapad eum iecoceseennesonden wig pnlaneanests 101 2 FOS scraped chica Mate el edad iter alent sal hen ioe Sacer gua raat ei Canaencreeioclanie 103 O24 IE FING TOT ia lc cate deaaicteaebislasbsenenctenwas A 106 922 MINISEED Gle TOTAL aoun a R cata 107 OZ BG E VOT IMA e e E E T E 109 92A S UDS He TOT leeres a a a 110 O75 GSE METON a ie a sce aetensees 111 9 2 6 Cos METOM aA eaa E A 111 PAT ORG Y HEr all e 112 OG FAY BACK ET E E E E A E E E E E T 112 OS O CE TCS E E E E A T E E 112 932 Rpadine Nard UISK S 054 snss nnn E TET T awe 115 IS OGOL TA DC Sar E T T Gan a eee 116 gA Automatic plav DACK serae onono OAA T E OIIE TOO OE OOTTE 117 TO Printime 0 POS ice se rnn N A A aE aa 119 TOUT Piep IR OU a a a N ee aatecetigaeatees 119 OAL LAU e PINAN eiii a ee a EAE NA 119 TO L2 Automatic screen SNOS sirri EOT ONE 121 4 Issue L User guide 10 27 COMlINMO US PLIM OULiidaieeistremotan Diary E E N 122 NOL Zl POPU Ca Une ee a vel ivt Ventolin E tanec 125 11 Loggi
62. ace in its directory This way the data recorded will have a known starting point If you select Ring Buffer then Scream will start deleting the oldest files in the data directory in order to make space for new data so that you will always have access to the most recent recorded measurements Scream does not check whether it 102 Issue L User guide created the files itself If you put your own files in Scream s data directory then they are at risk of being deleted If Stream Buffer Only is selected Scream will delete any file which no longer appears in the stream buffer This is useful if you are only recording to preserve data in the stream buffer through restarts of Scream If there is very little space on the disk the PC s operating system can become slow or unstable By default Scream will consider the disk full when only 50 Mb of space remains on it You can change this amount by altering the value at bottom right Leave x Mb free disk space 9 2 Files Another part of the Setup window allows you to alter the way Scream files the data it receives Click on the Files tab to open the following pane Display Pririt Stream Mapping Com Forts Recording Files Event Log Base Directory ec scream Hata Browse Filename format MMDDSYYYYMMDD_HHNN_ _A Byte Order Data Format GCF act Motorola Post Processor f Intel Granularity Sample Rates gt 20 spi i Hours Lower Sam
63. age manager to install in the usual fashion On some systems however you may need to use the nodeps option with rpm the force depends option with dpkg or a similar option with other package managers Please see Section 2 3 on page 10 for initial configuration steps 2 2 2 Installation from a tar gz archive The archive is created with relative file paths and contains at its root a single directory scream 4 5 It should be unpacked using tar xzf scream 4 5 tar gz or an equivalent command into a suitable location such as usr lib After unpacking you need to copy a file to the system library directory usually usr lib and create a symbolic link You normally need to have root authority to do this Change your working directory to the scream 4 5 directory and issue the following commands ep li bborgt 6 9 0 qt2 3 s0 usr 1ib ca j usr iid Im g Libborgt C 9 0 9 280 Jibborot 6 9 0i 7245 50 You may wish to change the owner and group of the extracted files according to your local policy August 2015 9 Scream 4 5 Once fully installed the application should be started by with the command install path scream 4 5 scream Please see Section 2 3 on page 10 for initial configuration steps 2 3 Initial Configuration all platforms Scream s screen available under the File menu allows you amongst other things to set the location of data files and log files It is wise to set these before proceeding You can view
64. all the transmission modes FIFO mode does not delete data once it has been transmitted You can still request anything in the Flash memory using Scream or over the command line The only way data August 2015 97 Scream 4 5 can be deleted is if it is overwritten in the RECYCLE buffering mode see below or if you delete it manually 8 5 6 ADAPTIVE not acknowledged no new data not acknowledged Flash storage Instructs the digitiser to transmit current blocks to clients if possible but to store all unacknowledged blocks in the Flash memory and re send them oldest first when time allows ADAPTIVE mode is best suited for real time installations where the link between digitiser and client is intermittent or difficult of access If the communications link is only marginally faster than the data rate it will usually be busy transmitting real time data Thus it may take a while for the instrument to work through the missed blocks In this case and if your client supports it you may prefer to use the Block Recovery Protocol to request missed blocks where possible Some software packages most commonly Earthworm cannot handle blocks being received out of time order If you are using such a package ADAPTIVE mode will not work and may crash the software 98 Issue L User guide 8 5 7 Transmission mode summary gt oOo ee fF ze Fz es Transmission Mo
65. am display for the active stream on or off Increase the colour brightness of the active stream s spectrogram Decrease the colour brightness of the active stream s spectrogram 13 3 Details window D Increase the stream s offset by one pixel regardless of any scaling on the stream August 2015 135 Scream 4 5 ca Decrease the stream s offset by one pixel Increase the stream s offset by the width of one lane Decrease the stream s offset by the width of one lane 136 Issue L User guide 14 Inside Scream 14 1 Command line options Options can be prefixed with either a hyphen or a forward slash in both Windows and Linux versions The option names are case insensitive view filespec filespec Launch in data viewer mode The files or directories specified are scanned and displayed in a single WaveView window Whilst Scream is scanning the files a small window displays the progress and estimated completion time A WaveView window in data viewer mode is identical to a real time WaveView window except that The data are not held in memory When you change the displayed time range by zooming in or out panning or resizing the window Scream re reads the data for the new time range The advantage of this approach is that you can view files in data viewer mode which are larger than the amount of memory available Real time Scream can only draw blocks which are kept in its memo
66. ata calculated as number of samples x sample rate End Sample Mismatch A block whose final sample reverse integrating constant does not equal the first sample plus all the differences within the block Checksum Errors A block whose checksum does not match the sum of all the bytes in the block Data Discontinuities Any detected gap in a stream along with the reason if known This includes reboots clock synchronisations and intentional gaps in triggered channels as well as any data lost owing to slow or poor quality communications links Status streams hold no duration information and are not checked By default log files are created in the user s directory Local Settings under Windows under different names according to the source of the data local serial inputs are logged by port in files named COMO CX 1O00 network servers are logged by IP address in files named aa bb cc dd log for the IP address aa bb cc dd and file and SCSI disk replays are logged in the file replay log Any events which do not relate to a particular stream are logged in the file scream log If you clear the File for each data source check box all events are logged to this file Log files can become quite large and it is usual to limit their size To do this tick Limit to and set a value in the box When a xxx log file reaches this size it will be renamed xxx old and a new empty xxx log file will be created If the file xxx old al
67. ave saved some filter designs as presets they will be listed below Design Select an entry to switch to a Custom filter with these settings If you have saved some filter designs as presets a Delete preset sub menu will also appear Select an entry in this sub menu to delete that filter design 4 1 5 Paused mode Click the Pause icon to stop the window scrolling If new blocks arrive which contain data from the time period displayed Scream will add them to the window Whilst a window is paused you can Scroll the waveform to left and right to view all the data that Scream has in memory Alternatively hold down i whilst turning your mouse wheel to scroll through the data Because new data are still being added to the memory buffer the scroll bar will move slowly to the left as long as the display is paused Zoom in and out to examine features in the data Select data from several different streams by holding down the shift key Gian and dragging August 2015 31 Scream 4 5 1163834 I 4 16316 4 F wv H WA amp Time cursors Ampl Cursors E E i Pre ee E S V ns 5 AN DO ART Analysis Package PSD in Velocity Units PSD in Acceleration Units Sine Wave Calibration Broadband Noise Calibration Relative Orientation If the region you have selected is entirely filled with contiguous data the selection is shown as a solid block If there are gaps or overlaps in any stream the select
68. boxes These boxes mark which streams of data to generate at each sample rate The screen shot above shows a possible configuration for 6 channel digitiser with two triaxial instruments connected Every channel of the digitiser may be output at any tap currently all three axes are being output at Tap 3 100 Hz If you want to change the names used for the channels click in the white box containing a Z in the above picture and type a letter or number It will name the channels with a sequence of letters or numbers beginning with the one you choose e g A B C 2 3 4 9 A B unless you type Z in which case they will revert to Z N and E Each combination of channel and tap has two check boxes The upper check box of each pair activates continuous output whilst the lower activates triggered output In the example above the digitiser will output data continuously for all six channels at Tap 3 but never for any other taps You cannot tick both continuous and triggered output for the same channel and tap When you enable a triggered stream the digitiser will output data in that stream only when a particular set of trigger criteria are met This is pictured in the window as a switch For example to generate high rate data from Tap 2 only when an event registers at some other tap the lower check boxes of Tap 1 should be ticked August 2015 79 Scream 4 5 ea 9TD 5N01 DM FW Configuration Setup System ID Output Control Trigger
69. can be used such as an abbreviation of your institution s name etc The system identifier can be up to 5 characters long whilst the serial number cannot be longer than 4 Sensor Type If the sensor attached to the digitiser is a G ralp velocity sensor useful seismometer functions such as sensor locking centring and calibration may be controlled through the digitiser The Sensor Type you set here determines which functions will be available through the Scream digitiser configuration set up interface or through interactive commands August 2015 77 Scream 4 5 GPS Type The digitiser needs to be able to time stamp accurately all data that passes through it It can set its clock either by receiving time signals from the GPS satellite network using an attached Garmin compatible NMEA output unit or by taking time information from a central site stream sync mode In stream sync mode the digitiser expects to receive two byte packets from the central timing source which may have its own GPS unit or take signals from one of the radio time standards Choose the mode you require from the drop down menu Enable GPS power cycling If you are using a GPS unit to receive time signals but do not experience significant drift in the system s clock for example in a stable temperature environment you can save power by selecting Enable GPS power cycling With this option in use the GPS time is only checked at intervals of a specifi
70. cream is saving data in a non block structured format and encounters a gap in the stream it starts a new file If the file name configuration does not permit sufficient granularity Scream will silently over write the previous file resulting in loss of data You should pay particular attention to the file name settings when using these formats in order to avoid this scenario Data Format Selects the format of the recorded data files Options are GCF SAC MiniSEED P SEGy PEPP SUDs GSE UFF ufa and ufb see below and CSS A single instance of Scream can only record in one format at a time if you need output in multiple formats you can either record in GCF and perform conversions later using freely available tools or record in one format and set up a Scream server to relay real time data to another Scream on the same computer see Chapter 5 on page 53 Byte Order For SAC SEG y UFB and CSS files the byte order of the files can be specified This can be used to match the byte order with the native order of the platform where you are going to perform analysis GCF and MiniSEED are defined to be in Motorola or SPARC byte order PEPP and SUDs data are defined to be in Intel byte order Byte order is not applicable to the ASCII like GSE or UFA formats August 2015 105 Scream 4 5 Granularity Allows you to decide how large files are allowed to become before a new one is started for three different types
71. ctory gtintf 70 d1l The Qt shared library which Scream requires to run scream directory calvals txt The sensor and _ digitiser calibration information file scream directory autoload The directory to take auto load GCF files from see Section 9 4 on page 117 c scream data The default directory for recording data You can change this see Chapter 9 on page 101 scream directory html The default directory for Scream s online help c scream logs The default directory for log files You can change this see Chapter 11 on page 126 14 3 2 Linux version scream directory scream The program itself scream directory scream ini The configuration file for Scream To restore the application to its factory settings close down all running copies of Scream and delete this file library directory libborgt 6 9 0 qt2 3 so The Qt shared library which Scream requires to run scream directory calvals txt The sensor and _ digitiser calibration information file scream directory autoload The directory to take auto load GCF files from see Section 9 4 on page 117 scream directory data The default directory for recording data you can change this see Chapter 9 on page 101 scream directory html The default directory for Scream s online help August 2015 139 Scream 4 5 scream directory The default directory for log files You can change this see Chapter 11 on page 126 14 4 Error messa
72. d by _li instrument 6 1 2 Macro commands The Terminal window provides icons for the keys GE which can be programmed with commonly used commands macros To define such a macro right click on an Fn icon and enter the command or commands in the text box You can enter these commands by left clicking one of the Fn icons in the Terminal window pressing the corresponding function key whilst the Terminal is open or right clicking on the digitiser s entry in Scream s main window and selecting the command from the drop down menu Scream will automatically start a terminal session with the instrument send the command and then close the link Scream remembers all your macro settings when you close the program 6 1 3 Direct connections You can also open a terminal session directly to your computer s serial ports or over a network This is useful for communicating directly with modems or with third party equipment To do this select File gt Terminal from Scream s main menu kg select Port to open Link Type Direct Serial Port Coml Baud Fate 38400 M Cancel To make a serial connection choose Direct Serial as the Link Type select the name of the serial port you want to use and August 2015 65 Scream 4 5 check that it has the expected baud rate If it does not you can change it in the Setup window see Section 3 1 on page 11 Click v o Scream servers can pr
73. d to display them in Waveview windows with their own colour and label This is done from the set up window As with all set up options Scream will remember any mappings you create and restore them next time you run the program August 2015 49 Scream 4 5 To create a new stream mapping 1 From Scream s main window choose File gt Setup Switch to the Stream Mapping tab 2 Tick Use Stream Name Mapping The pane will change to show the new options Com Ports Recording Files E went Log Display Print Stream Mapping EMail Input ID Mapped 7 ext Add Edit Remove Import X Lancel vi Apply 7 Help 3 Click Add and fill in the Stream ID you want to change the new label and colour 4 Stream Mapping Ed Stream IL DEMOZ2 New Label My ETD vertical Default Colour lad Change Cancel The label can be any length but may not contain any of the characters 50 Issue L User guide 2s 3 eu 2 because these characters are not allowed in DOS or Windows file names 4 Click x In this example new Waveview windows containing the DEMOZ2 stream will now automatically show it in the new colour and with the label My 6TD vertical The new label is also used in the main window on printouts and in the file names of recorded data streams if your format specifier includes the Stream ID Identifiers inside exported files will still use the original Stream ID
74. data are received the box gradually changes through shades of yellow to orange and finally red If more than two minutes pass before the next data block is received the border of the box will change to red to alert you that a suspicious gap in data has been detected If you do not expect real time data from this instrument or you are using low sample rates exclusively you may allow this column to turn red For example a 1 sample per second stream will transmit a block only once every four minutes under quiet conditions Double click on a column entry to select the instrument in Scream s main window 6 3 4 Errors This column records the number of corrupted blocks Scream has received A corrupted block is one whose checksum does not match the data or which fails one of Scream s integrity checks To see which checks are failing Open a ViewInfo window on the suspect stream where erroneous values are shown in red see Section 1 1 4 on page 74 Alternatively double click on the column entry to open the error log file if you are recording one in Notepad or an xterm The meaning of the colours is as follows Green Fewer than two corrupted data blocks have been received in the last minute or the window was reset less than a minute ago Yellow between two and ten corrupted data blocks have been received in the last minute Red More than ten corrupted data blocks have been received in the last minute 72 Issue L
75. de ss N a 4 t2 og 4 0 R lt Er Transmit continuous data Y X Yi Viv VXV Store continuous data X YY VY X SL X Transmit trigger data ZY X VY xX Vv Store trigger data X J Vi Vi lt 4 X Heartbeat messages X VY xX X X Strict time order 4 na PVPs xX Retransmit unacknowledged blocks n a X xX wv v Notes 1 Heartbeat messages will only be sent if no continuous streams are enabled The receiver can request a rewind if blocks are not received correctly but retransmission resumes in strict time order Real time data are prioritised over missed blocks Up to 256 blocks can be buffered to satisfy rewind requests The whole of flash memory is used as a retransmission buffer aes a 8 6 Buffer Memory Usage 8 6 1 RE USE RECYCLE Instructs the digitiser to carry on using the current transmission mode when the Flash memory becomes full overwriting the oldest data held This buffering mode is called RECYCLE in Scream and on the EAM For example in DUAL mode with RECYCLE buffering the latest continuous data will be transmitted to you as normal and the latest triggered data may be retrieved from the Flash memory using Scream or the command line However if you do not download data regularly from the Flash memory you may lose older blocks This mode thus lets you prioritise the most recent data held by the instrument 8 6 2 WRITE ONCE Instructs the digitiser to stop writing data to t
76. ding in the USGS SUDS 1 x format using the same rules for file and directory names as for GCF files see above but using the extension sud Files in SUDS format must represent a contiguous period of time Ifa discontinuity is detected in the incoming data stream then the file which is currently recording will be closed and a new file opened with a file name and time stamp matching the start of the new file This operation will take place regardless of the options you have specified for Granularity although the Granularity options will still work The files generated have STATIONCOMP and DESCRIPTRACE header structures using the following fields sc name network and dt name network The last 3 digits of the System ID sc name st name and dt name st name The first 4 digits of the Stream ID Issue L User guide sc component v for Zn streams n for Nn streams e for En streams m for the Mux channels Mn 9 2 5 GSE file format Scream supports recording in the GSE 2 0 format cm6 sub format using the same rules for file and directory names as for GCF files see above but using the extension cm6 Files in GSE format must represent a contiguous period of time If a discontinuity is detected in the incoming data stream then the file which is currently recording will be closed and a new file opened with a file name and time stamp matching the start of the new file This operation will take place regardless of the optio
77. e client side See Section 1 1 4 on page 56 for details of how to set up the server Additional clients may also request data from the Scream server This method is known as client pull Server internet Client Server firewall firewall Client UDP request UDP data The requests are placed in UDP packets which the server can recognize If your server is behind a firewall you will need to unblock the UDP port at both client and server side To request data from the server by this method 1 Switch to the My Client tab 2 Tick Receive Data to start Scream listening 3 Right click anywhere in the Servers list box and select Add UDP Server Enter the IP address in numerical form or as a hostname followed by a colon and the port number on which the server waits for requests e g 192 168 42 98 1567 4 Test communications by right clicking on the newly added server and selecting GCFPING A message appears in the Control pane logging the ping being sent If communication is good and the server is enabled for client requests you will receive a GCFACKN message acknowledgement from the server This will also appear in the Control pane 5 Request data by right clicking on the server and selecting GCFSEND B from the pop up menu B for big endian byte order Streams should soon begin to appear in Scream s main window Issue L User guide 6 To stop the link right click as before and select GCFSTOP fro
78. e data sources currently connected to Scream whether local instruments networked instruments or files being replayed Scream s source tree has two main parts Files which contains all the files you have replayed including automatic replay see Section 9 3 on page 112 and Network which represents your seismic network Beneath Network is a list of all the network servers Scream is connected to plus the entry Local for your computer s own serial ports 14 Issue L User guide The next layer contains the serial ports themselves These icons are provided to help you identify the instruments as well as providing direct terminal access E Scream File View Windows Help Stream ID Rec Format SPS End Time Date RIC Mo Sbit 17 27 45 2004 02 20 IMACALLANT No amp bit 17 05 20 2004 02 20 EF Coml Mo Bbi 17 05 20 2004 02 20 Comen No Sbit 17 05 20 2004 02 20 ae No Sbit 17 27 35 2004 02 20 No Bbi 17 2710 2004 02 20 B GURALP DA79 No Bbi 17 2710 2004 02 20 No Bbi 17 14 50 2004 02 20 No Bbi 17 14 50 2004 02 20 No Bbi 17 14 50 2004 02 20 No Bbi 17 1450 2004 02 20 No Bbi 17 1450 2004 02 20 No 32bit 1714 48 20040220 120574 No 32bit 1714 48 20040220 120153 No 32bit 17 14 48 20040220 119254 No Bbi 17 10 39 2004 02 20 HA No Sbit 17 2210 2004 02 20 MA we Po Bo ho E b co cy cy co co 4 4 4 4 1 1 1 I 0 17 streams 190Kb stream butter PC Time UTC 17 274 As an example the screen shot above shows Sc
79. e extension msd August 2015 107 Scream 4 5 Data are stored in 4K blocks with Motorola byte order using Steim 1 compression If a discontinuity is detected in the incoming data stream then the block which is currently being built is written to disk and a new block is started with its time stamp in the header Files continue to be created according to the options you have specified for Granularity The MiniSEED headers are formed to comply with the FSDN SEED naming conventions The instrument s serial number is used as the MiniSEED Station ID Streams with sample rates gt 80 samples s use H as the band code first character in the Channel ID Streams with sample rates between 10 and 50 samples s use B as the band code in the Channel ID Streams with sample rates between 2 and 8 samples s use M as the band code in the Channel ID Streams with sample rates of 1 sample s use L as the band code in the Channel ID All streams use H as the instrument code second character in the Channel ID Streams ending in Zn Nn and En use Z N and E respectively as the orientation code third character in the Channel ID You can also define your own SEED names for streams in Scream s scream ini file Todo this add a line to the end of the file reading EXPORTINFO After this line list channels you want to map one per line in the format SYSTID STREAM sta SSS chan CCC net NN Loc LL or SYSTID SERN sta SSS net NN l
80. e files To begin with the replay is set to the beginning of all files and the Pause button H is active 5 Use the Slower and Faster icons to set the speed at which you wish to replay the file s You cannot choose a negative speed Scream will replay data into the stream buffer which has a limited length If your file is longer than the buffer Scream will eventually begin overwriting old data To see this data you will have to begin the replay again If your file is shorter than the memory buffer you can safely choose the highest speed and play the entire file into memory You can read files into memory one at a time by selecting them in the drop down box If you select All files the files are replayed together at the same rate 6 When you are ready to play the file un pause the replay by clicking on the Pause button H 114 Issue L User guide Alternatively click the Block step button to replay the files one block at a time 7 Open Waveview windows as required on the data streams Waveview windows begin in continuous mode starting at the last data received i e played back All the normal functions of Waveview windows are available to you see Chapter 4 on page 27 If you want to pause the Waveview window to examine or measure signals it is recommended that you pause the replay beforehand so that the data you are viewing stays in Scream s memory buffer If you leave the replay ru
81. e required if you are sending data over difficult transmission lines for example some types of radio link Using two stop bits will add a 10 overhead to the data You will also need to set the data rate for Scream s local serial port as well as for the NAM EAM DCM or other communications device if you are using one In Scream you can configure a serial port by right clicking on its icon not that of the digitiser and selecting Configure from the pop up menu see Section 3 1 on page 11 If you are using an additional communications device you should consult its documentation to learn how to set its baud rate 88 Issue L User guide 8 Controlling digitisers To control a digitiser whilst it is running either right click on the digitiser s entry in the list to the left of Scream s main window not the Local or Comxx icons and click Control or simply double click the entry Scream will then contact the digitiser and retrieve its current status a process which will take a few seconds after which the Control window will be displayed Once you are happy with any changes you have made in the Control window click _ w 4rr to send them to the digitiser where they will take effect immediately If you cannot find the setting you want in the Control window it may be because the digitiser needs to reboot after a change Look in the Configure window instead 8 1 System When the Control window is first opened
82. ed number of hours Disabling this option keeps the GPS unit running constantly if you have ample power this will give the most accurate results You can choose any whole number of hours for the interval 1 2 Output control The Output control tab allows you to configure which data streams are sent to Scream from the digitiser kz STD SNO1 DM FW Configuration Setup Z NEX EA E EEE E E E E OOE w e E E Bf fa Bf fe TRETI G ralp digitisers initially sample incoming data at a high rate e g 2000 Hz for the DM24 which is then filtered and reduced to a lower rate decimated using an on board digital signal processing unit or 78 Issue L User guide DSP The DSP has several filtering decimation stages which run one after the other Stages which can produce output are called taps The G ralp DM24 and CD24 digitiser can both output four taps simultaneously Each configurable tap can be set to a different decimation factor by choosing values from the drop down menus on the left Decimation factors of 2 4 5 8 and 10 are available The numbers visible in the drop down menu of each tap are the data rates that each of the possible decimation factors will provide given the settings of the taps above it Only integer Hz data rates are allowed thus for example if one tap produces data at 25 Hz the only possible further decimation factor is 5 To the right of each decimation factor menu is a grid of check
83. ent values for some channels you should clear the Common values check box before altering them Once you have enabled the STA LTA triggering method on a particular channel you can use the Control window to change the values of the STA and LTA periods together with the Ratio without restarting the digitiser see Chapter 8 on page 89 August 2015 83 Scream 4 5 Since it is not generally advisable to trigger from broadband data the digitiser provides a set of standard bandpass filters to apply to the data streams before they are tested for the trigger condition This filtering serves to maximise sensitivity within the frequency band of interest and filter out noise outside this band You can select which bandpass filter to use from the Bandpass filter drop down menu The corner frequencies of the pass band of the filter are determined by the Nyquist frequency which is given by the sampling rate of the triggering data The three filter options have pass bands between 10 and 90 between 20 and 90 and between 50 and 90 of the data s Nyquist frequency respectively The possible filter configurations are Rate samples Tap s 0 200 100 50 1 40 29 20 50 29 20 10 8 25 rP N A Ol 84 Bandwidth 1 Hz 10 90 5 45 20 2250 2 18 L25 FEO b 9 Zig A AO 1 29 1T1 25 T 0 5 4 5 0 4 3 6 0 29 2 29 0 2 1 8 0 1 0 9 1 29 11 25 0 5 4 5 029220 0 2 1 8 0 1 0 9
84. er Scream running on the same computer use the IP address 127 0 0 1 To send data to more than one Scream running on the same computer use the local broadcast address 127 0 0 255 or set up a multicast group You can limit the data Scream sends by setting a maximum sample rate for transmitted streams Enter a value into the x sps transmitted block limit box to set this rate This is useful if your network connection is slow or congested The default value is 1 000 samples per second For example if a digitiser is configured to generate 4 samples per second and 100 samples per second continuous data you could monitor the data remotely over a low bandwidth network by setting this value to 10 The high rate data can still be recorded on the server if Scream is so configured see Chapter 9 on page 101 but they will not be sent over the network August 2015 57 Scream 4 5 58 Setting this value to zero suppresses all data streams but still transmits status streams You can configure Scream to let remote clients configure the instruments connected to your computer To enable this select Allow remote access to Com Ports If you are concerned about security or there are potential problems from outside interference disable this option You should never enable this option if you are transmitting data across the Internet To alter the IP address or destination port of a client right click on it and select Edit Enter the
85. etects a SCSI interface with at least one tape drive connected and a suitable ASPI driver layer has been installed If more than one tape drive is connected Scream will use the one with the lowest SCSI ID 116 Issue L User guide To record data select File gt SCSI Tape gt Record Data All data subsequently received by Scream will be recorded onto the tape regardless of where it comes from or whether the Rec option is set for the streams Choose File gt SCSI Tape gt Record Data again to stop recording If the tape drive fails or goes offline for any reason Scream will begin buffering data internally and will continue recording once the fault has been resolved To replay data select File gt SCSI Tape gt Replay Data This opens a Replay window for loading the data on the tape into Scream Data are loaded into Scream one block at a time Scream then waits until a time determined by the Faster and Slower icons in the Replay window before loading the next block Setting these icons to Max stops Scream from waiting at all If you are using a slow tape drive Scream may not need to wait and so the faster replay speeds will be equivalent Do not attempt to replay data from the tape whilst you are recording to it To rewind the tape to the beginning select File SCSI Tape gt Rewind If you are recording data onto the tape Scream will resume recording as soon as the rewind operation finishes To eject the
86. ew minutes giving information about the GPS status ambient temperature etc l Offset Drift 2005 12 22 17 50 00 o s 270 drift 2005 12 22 17 50 00 2 MNicroSeconds Fast Freq error O0 2005 12 22 18 01 00 2005 12 22 17 51 00 o s 270 drift 0 pwm 782 2005 12 22 17 52 00 o s 224 drift 46 pwm 762 2005 12 22 17 53 00 o s 210 drift 14 pwm 762 2005 12 22 17 54 00 o s 210 drift 0 pwm 782 2005 12 22 17 55 00 o s 210 drift 0 pwm 7382 2005 12 22 17 55 00 External supply 24 3V Temperatu 2005 12 22 17 56 00 o s 210 drift 0 pwum 782 2005 12 22 17 57 00 o s 221 drift 11 pwm 752 2005 12 22 17 58 00 o s 261 drift 40 pwm 752 2005 12 22 17 59 00 o s 235 drift 26 pwm 782 2005 12 22 18 00 00 GPS Date Time 22 12 05 18 00 00 J 2005 12 22 18 00 00 o s 211 drift 24 pwm 762 2005 12 22 18 00 00 Auto 3 D SV s 20 11 19 28 22 2005 12 22 18 00 00 Lat 51 21 6600N Long 001 09 611717 b Scream can automatically extract measurements from these messages and show them in graphical form For each field Scream finds a check box is displayed at the top of the Status window In the example above Scream has found Offset Drift PWM Volts i e user input and Temp temperature fields in the status messages Not all digitisers output all of these fields so some of these check boxes may not be present To display any or all of these fields in graphical form tick the check box es for the field s you want to exam
87. ges 140 Unable to detect configuration Scream has not been able to retrieve the current configuration from a digitiser This can happen because The device is not connected The communications link is one way simplex Scream needs reliable two way communications to discover the digitiser s set up However you can still receive data over a simplex link The device is heavily loaded and Scream times out waiting for a response from it The network between Scream and the computer hosting the device is slow or unreachable You can check this using the standard command ping ip address to check that the remote computer is responding If your computer is on the same network as the remote device it must be on the same subnet as that device or it will need to connect through a gateway machine It is recommended that you wait for data to be received from the digitiser before you attempt to configure it Unable to save program status The Scream ini file could not be opened for writing This can happen because The file or disk are write protected You do not have the right privileges to change the file The file is in use by another program Unable to write to stream An error occurred when Scream tried to write a data block to the disk This can happen because Issue L User guide The disk is full The disk or directory is write protected Another program is using the same file or you are replaying it in
88. gitisers 76 Scream distinguishes between configuration and control of digitisers The most important difference is that a digitiser may be controlled through Scream at any time whilst it is acquiring data whereas configuration options only take effect after a reboot with consequent loss of data To change the configuration of any connected digitiser 1 Locate the digitiser you want to configure All connected digitisers have an entry in the tree on the left of Scream s main window If the digitiser is transmitting data through a remote server or EAM you may need to unroll the entry for that server by clicking on the H icon to see the digitisers connected to it 2 Right click on the digitiser s entry not the icon for the server or any Comxx icon 3 Click Configure Scream will then contact the digitiser and retrieve its current configuration a process which will take a few seconds When this is done the Configuration set up window will be displayed 4 Once you are happy with any changes you have made in the Configuration Setup window click UPLOAD to send them to the digitiser and reboot This will take around a minute To control a digitiser while it is running either right click on the digitiser s entry in the list and click Control or double click the entry In either case Scream will contact the digitiser to retrieve control information and display the Control window The options you can control
89. he Flash memory when it is full and to switch to DIRECT mode automatically August 2015 99 Scream 4 5 For example in FIFO mode with WRITE ONCE buffering the station will transmit data to you continuously but also save it in the Flash memory until it is full Once full the instrument will switch to DIRECT mode and continue transmitting though no further data will be saved This mode thus lets you prioritise the earliest data held by the instrument 100 Issue L User guide 9 Recording and playback Scream allows you to record all incoming data and store it on the local hard disk To do this you should select the streams you want to record from Scream s main window right click and choose Start recording from the pop up menu The streams will display Yes in the Rec column to indicate that they are recording When Scream starts recording it starts at the earliest point in the current stream buffer and immediately records all the data that it can For continuous streams the recorder will soon catch up with the real time data If there is a gap in a stream e g because you are using adaptive mode see Section 8 5 6 on page 98 Scream will delay recording that stream until the gap is filled If the gap reaches the end of the stream buffer before data are transmitted to fill it Scream will give up and begin recording data from after the gap By default recorded data are placed in a data directory within the Sc
90. he instrument has not reported a satisfactory timing fix for over an hour This will happen if there have been gaps in the signal as above but also if it has not reported anything If you have set the GPS system to power down for intervals longer than an hour the icon will turn red even if the system is working normally 6 3 2 Mass position This column details the instrument s mass position status Double click on a column entry to open a Waveview window on the instrument s mass position channels D Note some instruments must be switched to one second response mode for these channels to give meaningful data Grey Scream has not received any mass positions information from the instrument since the last reset Green The instrument has reported satisfactory mass positions all components lt 25 of full scale Yellow One or more components are reporting mass positions between 25 and 50 of full scale Most instrument types will still function normally but the masses should be re centred when it is next convenient August 2015 71 Scream 4 5 Red One or more components are reporting mass positions over 50 of full scale Most instrument types will still function adequately but the masses should be re centred as a matter of urgency 6 3 3 Age This column records the time the instrument last sent data to Scream When a data block is received the box turns green Over the next two minutes if no more
91. health and other diagnostic information known as multiplexed Mux channels The number of Mux channels depends on the model and configuration of your digitiser Generally three channels are used to report the sensor mass position In addition to these depending on the digitiser options selected up to twelve Mux channels may be configured for the user s own purposes 86 Issue L User guide Some digitisers have a separate AUXILIARY port which can be used to input signals which are digitised to these channels The collection and transmission of Mux channels is controlled using the Mux Channels pane Auxiliary Inputs System SOH MO Channel 0 M7 Channel 1 bW Channel 2 Ma Channel 3 Mo Mass Position MO AS Mass Position MA EAW Mase Position MB M4 Channel 4 M5 Channel 5 MMB Channel 6 M7 Channel MC MD ME MF aaa el m Check Clear all coi Pie If a tick is placed in the box next to a channel its data will be collected and transmitted as a data stream in GCF format just as with the normal data channels To indicate that the data comes from a Mux channel the Stream ID will take the form Mx where M stands for Mux and x is a hexadecimal integer i e 0 9 and A F for 10 through 15 CheckClear all Depending on the type of digitiser you connect Scream may be able to replace the legends with descriptions appropriate to the digitiser For example
92. hers allowing you to transfer the data quickly and easily for further analysis or processing GCF data files including data from G ralp Systems NAM EAM or DCM units can be read replayed at variable time scales viewed converted or printed with a few mouse clicks August 2015 7 Scream 4 5 Support for SCSI tape devices is also included for secondary backup or large volume archival See Chapter 9 on page 101 and Chapter 10 on page 119 for details of these features 1 2 Scream as a data viewer Scream can also be run in a slimmed down viewing mode which loads in a GCF file selection of files or a directory containing files and displays the data in a Waveview window To use these features Double click on a GCF file to open a WaveView window showing the data in the file Any valid GCF file can be loaded including multi stream files and files with gaps or out of order data To open a WaveView window showing all the data in several GCF files select the files right click and choose View in Scream from the pop up menu To search one or more directories for GCF files and display all the data in these files select the directories right click and choose View in Scream WaveView windows opened this way behave exactly like windows from the real time application except that the pause button II is replaced with a button which resets the view to its initial settings You can design and apply filters draw
93. hould receive Re Sync and Data Discontinuity messages as well Re Syncs Whenever the digitiser s internal clock is resynchronized with GPS These are normal after a re boot or an extended period of GPS outage Data Discontinuities Any detected gap in a stream along with the reason if known This includes reboots clock syncs and intentional gaps in triggered channels as well as data lost owing to slow or poor quality communications links You should check the log files see above to help you determine the cause SAM disk full SAM units send status messages when they stop recording data because their disk is full SAM units in circular buffer 128 Issue L User guide mode carry on recording and do not send these messages This does not work with DCMs EAMs and NAMs only SAMs Scream Start Stop Generated by Scream when it starts and when it shuts down cleanly If a computer suffers a sudden loss of power or is not shut down properly Scream will not be able to respond in time so you will not see a Scream Stop message Scream recording stopped Whenever recording fails for a particular stream because of a write error on the local disk Check that the disk is not full and that you have write access to the relevant directories If you have Auto Record Enable active and have set recording to GCF format replaying a previously recorded GCF file will cause Scream to attempt to record to the same file causing th
94. igitiser s internal temperature X0 X7 denote the auxiliary analogue input channel on newer DM24 units digitized using the same tap settings as Z N and E CO C7 denote the same input channel when it is being used for an input calibration signal Z N EG N are the channels Z N EO 7 respectively when they output triggered data IB denotes digitiser Information Blocks containing user information Scream tries to interpret these blocks and automatically extracts data from them for use in WaveView windows or Matlab extensions CD BP are digitiser streams for specialised use August 2015 17 Scream 4 5 Scream can replace these designations with more helpful names if you wish see Section 4 4 2 on page 49 Rec Whether Scream is currently recording the data stream to the computer s on board hard disk not the digitiser s memory If another device on your network is recording the data stream independently of Scream the entry in this column will still be No If this entry shows ERR then there has been an error whilst writing data for this stream Investigate the cause then re enable recording to clear the error Comp The compression factor of the data in the stream expressed as the number of bits occupied by each record 8 16 or 32 bits This can vary block by block SPS The sampling rate of the data stream in samples per second Status streams ending in 00 do not constantly output data and have an SPS
95. igitisers can use However not all models can use both methods Scream will find out from the digitiser whether its on board software supports each method In addition some digitisers support external and software triggering 7 3 1 STA LTA The STA LTA algorithm applies a simple short term average long term average calculation to the triggering stream It works by identifying sections of an incoming data stream when the signal August 2015 81 Scream 4 5 amplitude increases The purpose of taking a short term average rather than triggering on signal amplitude directly is to make it less likely that spurious spikes or generally elevated background noise will trigger the device Averaging also introduces an element of frequency selectivity into the triggering process You can select which tap is tested for the trigger from the Data source drop down menu The tap does not have to output data to Scream for you to be able to use it here Any or all of the channels available at that tap may be used to determine a trigger You can select which channels are considered by ticking the boxes in the Channel column of the table If any of the ticked channels passes the trigger condition the trigger will activate and will not de trigger until all of the ticked channels have fallen below their respective ratio values The STA and LTA columns allow you to set in seconds the intervals over which the two averages are calculated Typical
96. improvements Various corrections Dynamic IP correction Update for Scream 4 4 Update for Scream 4 3 Added revision history Update for Scream 4 2 New document Scream 4 1 Issue L
97. ina Mux Channels Forts 100 Highpass WE Bf fe Bn fa E a E e wt lt wt nf fa Be naa Triggering vf UPLOAD M Cancel Help With this configuration uploaded Tap 3 will continue to produce output at all times but Tap 2 will also emit data whenever the trigger criteria are met The Triggering button is now shown in red to remind you that the trigger is active Every ticked box in this window will give rise to a data stream coming from the digitiser which will be displayed in Scream s main window when Scream first receives some data from it 1 3 Triggering In its standard configuration the digitiser outputs continuous data at a sample rate you specify In addition to this G ralp digitisers can run a triggering algorithm on the data they acquire This allows you to record data continuously at a relatively low sample rate but record at a much higher sample rate during short periods when the trigger is active The parameters controlling the triggering algorithm and controlling the data output once the system is triggered are all selectable by the user permitting maximum flexibility of operation and the most efficient use of available storage space The digitiser can be set up for triggered output that is to generate certain data streams only when a particular trigger criterion is met The trigger criterion can be tested with data from the same or some other stream For example you could
98. indows at all times Other applications may still cover Scream s main window 26 Issue L User guide 4 Waveview windows The most commonly used features of Scream are accessed through Waveview windows You can open as many Waveview windows as you like on any combination of streams the same stream can be part of several Waveview windows at once at several different scales a Waveview Efe Ea 165536 X 2 da PE w FE amp Time cursors Ampl Cursors 2005 05 21 00 17 26 To open a Waveview window from Scream s main window select Window gt New Waveview Window from the main menu double click on a stream ID in the streams list right click on a stream in the list and select View or make a selection of streams and double click the selection or press ENTER You can add further streams to the Waveview window by selecting them from the streams list and dragging the selection into the Waveview window or by dragging them from other Waveview windows Dragging with ea held down will copy the stream from one window to another otherwise the stream will be moved to the new window August 2015 27 Scream 4 5 If you are running Scream in real time mode and you double click on a GCF file to view it or open the Scream viewer in some other way you will have both real time and view windows open In this case you can drag streams from real time windows to other real time windows but
99. ine Status GSL A23700 n T Offset M Drit DO PwM T Volts Mi o NIMS Sec 7 Temperature 17 00 00 17 30 00 18 00 00 2005 12 22 12 22 18 External supply 24 3V Temperatula 12 22 18 o s 219 drift 9 pum 762 12 22 18 o s 263 drift 44 pwm 752 12 22 18 H o s 270 drift 7 pwm 762 12 22 18 o s 265 drift 5 pwm 752 12 22 18 o s 210 drift 55 pwm 7682 12 22 18 H 1 MicroSeconds Fast Freq error 0 12 22 18 o s 210 drift 0 pum 702 12 22 18 o s 210 drift 0 pwm 762 7 gt 69 Scream 4 5 You can resize the Status window or drag the bar between the graphs and the block display area to see the graphs in more detail 6 3 The summary window This window provides at a glance state of health information about all instruments on your network To open it choose Windows gt Summary window from Scream s main window __ Reset All ERRORS TRIGS BHOLE DAG 0 D00 2 DT12 CO nos11 3420 Co GURALP 3E75 C GURALF 6TD EE GURALP CMGE GURALP DM24 GURALP S156 MKSPWw DEMO C E L L SEMTES I501 SENTES IS02 SENTES I503 SENTES Is04 Every instrument known to Scream is listed in this window with coloured icons representing their timing mass position and data flow status The window also reports how many triggers have been communicated to Scream in status blocks To make Scream forget all this information and start afresh click Reset All This will not remove strea
100. ing You can also set up Scream to print automatically or send data directly to a connected plotter For full details on the printing options available in Scream see Chapter 10 on page 119 Q Note The print facility is a good way to produce PDF outputs of waveforms by using a PDF printer driver e g PDFcreator 4 1 4 Filtering Clicking the Filter icon J makes Scream apply a filter to each of the displayed streams Click the icon again to disable the filter Scream can be configured to apply different filters to each WaveView window To select the filter click on the arrow beside the Filter icon A drop down menu will appear TAa i E w Default Filter Custom Filter Select Default filter to apply Scream s built in FIR bandpass filter The properties of this filter depend on the sample rate of the stream Data at 1 or 2 samples per second are filtered with a 10 30 second pass band whilst data at other sample rates are filtered with corner frequencies at 0 1 and 0 9 times the Nyquist frequency of the stream For example the pass band for the 30 Issue L User guide filter applied to a stream at 100 samples per second will be 5 45 Hz Select Custom filter to activate the filter you have designed If you have not designed a filter a 10 30 second pass band filter will be used for all sample rates Select Design to open the Filter Design window see Section 4 3 on page 40 If you h
101. ion is shown in a hatched style xX o377 4 ft w IE MUU UU ELELEE LIELU Y 15 10 LS DEMONS 32 Issue L User guide Select data from two streams by holding down and dragging from one to the other 1 16384 X gt 16316 bd F w Bp Time cursors Ampl Cursors O a S 4 E ee ee ee ee I 15 22 15 23 ART Analysis Package PSD in velocity Units PSD in Acceleration Units Sine Wave Calibration Broadband Noise Calibration Relative Orientation Save data to a file by selecting one or more streams using either of the methods above and choosing Save EM Save Selected Data Please select a directory to save to iles Guralp Systems Scream4 O data extract Browse Select a format for the file s GCF gcf Single File Files will be saved in the fom YearMonthDay_HourMinuteSecond_Sys D_Stream D j Cancel Select the directory and format for the file and click to save the data with one file for each stream using the format shown Some formats support multiple streams per file For these formats you can select Single File to combine the streams The number at the top left of the selection is the number of samples from each stream that you have selected Use data in a filter design by selecting a single stream and choosing Use in Filter Design from the pop up menu See Section 4 3 on page 40 for details Pass data to a Scream extensi
102. is error The file will be undamaged GPS Control Timeout Generated if Scream has previously received satisfactory GPS synchronization messages but has not received any within the last 12 hours Scream will not send another GPS Control Timeout message until GPS operation resumes at which point it will restart the 12 hour timer Digitiser Trigger Report Whenever the digitiser triggers Scream determines this from lines in status messages and not from the data streams Accordingly there may be a slight delay between a trigger and this message The contents of the status lines are repeated in the message Mass Positions Generated if an instrument reports a mass position above the value you specify expressed as a percentage of the maximum possible value Most G ralp instruments can operate satisfactorily with mass positions up to 50 of their travel some can operate with significantly higher mass positions Disk Full Warning Generated if the amount of data on the hard disk exceeds a specified percentage of the size of the disk August 2015 129 Scream 4 5 12 Extending Scream Scream is a data communication visualisation and recording tool It is not intended for performing detailed analysis on the data received However extensions are available for Scream which can carry out calculations on seismic data These extensions can be stand alone programs or scripts written in MATLAB Some sample extension scripts are
103. lay Streams to draw all visible streams in the middle of the window overlaid one on top of another Ta WaveView a 4 05874 MH Ampl Cursors rir yprrireti Ptr ree piri rT prrrri rri pirrr pom rrr TESEH TTi irri rrr rrr 19 10 August 2015 35 Scream 4 5 This is useful if you want to compare event records from several instruments in an array Select the Overlay Streams option again to return to the normal display settings 4 2 Stream functions There are also several actions you can perform on individual streams which can be accessed from the context sensitive menu Each stream has its own focus lane although large signals or high zoom factors may make the trace extend outside the lane SEE x gt 05874 4 Ey u A amp Time cursors Ampl Cursors T a rrr PILLES pR rrevyprrrrsy OSG C0008 Cee T perry peer pret perry RUTUSUEURU FUI EUELA E GLISLSTL ELIS aLISUSL EL perry When you move the mouse pointer over a lane a selection box is drawn around the corresponding stream s label in the panel to the left Right clicking will bring up the menu options for this stream If you have selected Overlay Streams for the window the focus lanes are still present even though the streams are not drawn inside them Right clicking in the window anywhere to the right of a stream identifier will bring up the context menu for that stream 36 Issue L User guide 4 2 1 Identifying streams
104. ll open you can now replay the files as above 5 You can open more groups of streams by repeating steps 1 4 as desired To record data from the disk into your file system right click on the streams when they appear in the main window and select Start Recording as for a real time stream Data will be recorded in the file format and using the file names you specified in the Recording and Files tabs of the Setup window For the highest replay rate do not open Waveview windows on the streams as you replay them Alternatively if you are using Linux you can create a raw disk image with the command dd For more information see the Linux man page for dd Scream can read raw disk images as if they were connected disks to attach an image to a disk slot run Scream with the command line scream disknn image bin where image bin is the path of the image file and nn is a slot number between O and 99 This command line option can be repeated as many times as necessary Once you have read all the data on a disk you can blank or reinitialise it by selecting File gt Reset SCSI disk from the main menu You can now remove the disk and re use it in for example a 6TD Scream will not reset a DOS formatted disk this way in case it contains other files besides data DOS disks can be reformatted by your operating system 9 3 3 SCSI tapes Scream can also replay data directly from an attached SCSI tape provided that it d
105. ll the control signals will be available For example CMG 3ESP sensors can be centred from Scream but must be locked 92 Issue L User guide and unlocked manually whilst a CMG 3T has remote lock and unlock commands CMG 40T CMG 6T seismometers and CMG 5T strong motion instruments do not need locking or unlocking If you have set the Sensor Type to one of these sensors the Mass Control tab will not be available 8 5 Data flow The digitiser operates in one of several transmission modes These modes relate to how the unit uses its Flash memory as a simple data store from which you can request data FILING and DUAL modes as a buffer holding unacknowledged blocks which are transmitted in preference to real time data FIFO mode as a buffer holding unacknowledged blocks which are transmitted whenever the transmission is free and no real time data blocks are ready ADAPTIVE mode not at all DIRECT mode Separate from these modes are buffering modes which tell the unit what to do when its Flash memory becomes full It can either carry on overwriting the oldest data held or stop writing and switch the digitiser into DIRECT mode You can switch between transmission modes in Scream by right clicking on the digitiser and clicking on Control then navigating to the Data Flow pane August 2015 93 Scream 4 5 E GURALP DA79 DM24 Control Transmission Mode Butfering 64h b Direct Wirite once
106. lt printer immediately afterwards 10 1 1 Automatic printing To produce page printouts from a Waveview window on your default printer at regular intervals 1 Click the arrow beside the Print icon amp 7 to display a drop down menu August 2015 119 Scream 4 5 2 Choose Auto Print and tick Enable Auto Print ea Auto Print Options Monochrome From To Eyer 22 00 00 08 00 00 120 Minutes Times m UTC Cancel 3 If you want print outs in black and white tick Monochrome 4 In the three boxes below specify the time period each day when Scream will auto print and the interval between print outs Printing takes place at the end of each time period For example if you set From to 05 00 00 To to 10 00 00 and Every to 120 minutes Scream will automatically print the contents of this Waveview window every day at 0700 0900 and 01100 UTC If you have also set the Waveview window s width so that it displays 120 minutes of data the resulting printouts will cover the entire period 0500 1000 5 Click ok _ Each page has a title at the bottom which is taken from the title of the Waveview window To change this title right click in the window and select Label Enter a new label and click ok This label is also used as the job name when Scream sends data to your printer Any changes you make to the Waveview window will now be reflected in later printouts If you want to examine
107. ly the time interval for the short term average should be about as long as the signals you want to trigger on while the long term average should be taken over a much longer interval Both the STA and LTA values are recalculated continually even during a trigger The Ratio column determines by what factor the STA and LTA must differ for the trigger to be passed Finding the ratio most suited to your needs is best done by experiment Too high a value will result in events being missed while too low a value will result in spurious non seismic noise triggering the system Like the averages their ratio is continuously recalculated for all components Note None of the boxes are allowed to be empty and so you will need to enter the new value before removing the old one Alternatively you can use the and a cursor keys to change the values For example setting the STA to 1 second the LTA to 10 seconds and the Ratio to 4 would give rise to the trigger behaviour depicted in the following illustration 82 Issue L User guide Raw data Short term average 1 sec 2 Long term average 10 sec ae a cts a IN ESS eel Fes oTA LTA ratio j posh frig 30 40 50 60 r i of 100 110 120 Time seconds Usually the values of the STA and LTA periods and of the Ratio will be the same for all ticked channels For convenience Scream will automatically fill in other values to match ones you enter If you want to use differ
108. m Stream Buffering You can change the size of Scream s stream buffer by altering the value and unit in these boxes Scream will discard any data older than this If you want to record data to your computer s hard disk you should use the Recording and Files panels when you enable recording on a stream any data in the stream buffer will be included in the recorded files Scream can also play back recorded GCF files see Chapter 9 on page 101 Status Font Click Select to change the font used in status streams The change comes into effect on new and existing Status windows as soon as you Click click or w Appl Waveview Defaults Allows you to take the default properties for new Waveview windows from a window already on the screen Click Select and then on the window you wish to copy When you 48 Issue L User guide click Or w Apply new Waveview windows will have the same horizontal zoom factor filter and block boundary options background colour and time amplitude cursor state as are currently in place on that window The vertical zoom factor is used only for new blank Waveview windows since Scream automatically chooses a suitable factor if it can Colour coded Components When this box is ticked Scream will look for stream names ending Zn Nn En or Xn and automatically display them in the colours shown To change the default colours click on the boxes Other streams are assigned a colour
109. m the pop up menu If you do not GCFSTOP the server will continue to transmit to a client that is no longer listening You should ensure that the server replies with a GCFACKN message If an acknowledgement does not appear in the Control pane repeat the GCFSTOP command Scream automatically issues a GCFSTOP to all connected servers when it exits The steps above can be repeated as many times as necessary to pull data from several servers Scream remembers all the network settings when it exits and automatically tries to reconnect when you start it again 5 1 1 TCP clients Clients can also make a TCP connection to Scream and request data Using this method block re transmission requests are delegated to the network protocol stack but there is a significant overhead involved in keeping the connection active Clients using TCP can access the server by its host name as well as by its IP address This is useful for installations where the IP address may change 5 1 2 Multicast clients Multicasting is a feature of TCP IP which allows you to send network packets to several clients at once These are most often used on local networks Multicast servers use addresses between 224 0 0 0 and 239 255 255 255 CMG EAMs and CMG NAMs for example always listen on the multicast address 239 193 15 67 Mnemonic 239 193 is in the privately assignable block and 1567 is the default scream port When you Add a multicast server right clicking on
110. ming fix has been achieved It will then power it down for the specified duration before powering it up again 8 2 Triggering The Triggering pane is very similar to the corresponding pane of the Configuration set up window although not all options are available because some changes require rebooting the digitiser See Section 7 3 on page 80 for more details t 5TD 5NO1 DM FW Control System Triggering Calibration Data Flow STA LTA LEVEL Channel STA LTA Ratio Channel Level Dz fio fo z 0 100000 M Ng fi ao 40 N 1 I E 1 10 4 0 E 2 100000 4 oo000 Boman Common values zji fpo fpo ala o lia Da S iv Common values z m doi io 40 M x3 100000 Oz Ve Enable External Trigger Input Pre T rigger seconds 10 Enable External Trigger Output Post T rigger seconds 20 Xone _ 2 ie 90 Issue L User guide 8 3 Calibration You can check that your instrumentation is correctly calibrated by injecting known signals into the sensor s feedback loop The Calibration pane allows you to do this once the sensors are installed f STD 5NO1 DM FW Control aE Sine Wave Period 10 Seconds f Square Wave step C Broadband Noise Component 1 Duration minutes 100 Amplitude Repeat calibration every 1 day attime 19 23 UTC x Close Help Each channel can be calibrated separately For most triaxial digital instruments
111. ms from the main window the Waveview windows or the stream buffer Tr Tr I Ol m D aAa A A A A A A In the leftmost four columns each entry is a coloured rectangle with a border A grey rectangle indicates that no relevant data have been received from the instrument since Scream was started Green indicates that this measurement is satisfactory yellow indicates that some attention may be necessary and red indicates that there is probably a problem If a box has a coloured border an unsatisfactory reading has been received since the last reset but the status has since improved Thus if a box goes from yellow to green the border will be coloured yellow 70 Issue L User guide until you reset If the same box subsequently turns red momentarily and then returns to yellow or green the border will change to red 6 3 1 Timing This column details the instrument s GPS timing status The colours are the same as those used for the top half of the instrument s icon in the main window Double click on a column entry to see the status messages coming from that instrument Grey Scream has not received any GPS information from the instrument since the last reset Green The instrument has reported a satisfactory GPS timing fix Yellow The instrument has reported a gap in the timing stream This may occur if the GPS signal deteriorates to the point where the receiver cannot keep a lock on the satellites Red T
112. n Windows Vista and above the operating system might silently redirect and file access that Scream performs to the Program Files folder to the VirtualStore A discussion of this technique is outside the scope of this manual Each stream has its own section in the file headed by the line instrument id The instrument id is the string which identifies the digitiser in the left hand pane e g GURALP DEMO It is formed of up to 6 characters the system identifier followed by a dash then up to 4 characters the serial number Scream and its extension scripts check to see if the streams being received match any of the instruments in the file If they do the computer will apply the correct values for your sensor automatically You can edit sections of the calvals txt file within Scream by right clicking on a digitiser icon and selecting Calvalls The format of each section is given in Section 3 8 on page 21 14 3 File and directory locations 14 3 1 Windows version Scream creates or uses the following files and directories scream directory scream exe The program itself scream ini The configuration file for Scream If updating older installations this file may be in the windows directory e g 138 Issue L User guide C WINDOWS scream ini for new installations this will be in the c scream directory To restore the application to its factory settings close down Scream and delete this file scream dire
113. n inches leaving some room for binding notes etc if desired and Page Length to a suitable value also in inches Page Length does not need to correspond to an actual page size it is only used to specify when to print certain labels see below 5 The final three options determine when to print various labels namely the Stream ID of each stream an amplitude scale and a date stamp If you select Every Page for one of these the label will be printed at intervals of Page Length above August 2015 123 Scream 4 5 If you select When Change the label will be printed whenever that attribute of the controlling Waveview window changes i e the Stream IDs when a stream is added or removed from the window the amplitude scale when the vertical zoom factor is changed and the date every midnight 6 Click ok 7 Create a Waveview window containing the streams you want to print 8 Choose a suitable amplitude scale for each stream within the window Each trace will occupy the relative width across the page as it does across the controlling window 9 Choose a suitable time scale in the window The figure between the Scale icons 4 2 I determines the scale that will be used in lines per second i e one pixel in the Waveview window corresponds to a single line on the printer Because printer lines are generally smaller than screen pixels a typical screen resolution is about 75 DPI the printed traces will appear s
114. nable External Trigger Input selected it will record data when it receives an external trigger as if it had triggered itself but it will not send that trigger on to other digitisers It will only send a trigger message if its own triggering criteria are satisfied For full details on external triggering see the manual for your digitiser or the technical notes available on the G ralp Systems website 1 3 4 Pre trigger and post trigger recording In order to capture all of a seismic event it is often useful to be able to record data immediately preceding the trigger G ralp digitisers have an internal buffer of some seconds which allows this data to be added to the triggered stream Pre trigger data are particularly useful for emergent type signals where the system does not trigger until one phase after the first arrival In addition to ensure that the coda of each event is included some seconds of data are recorded after the system detriggers The two boxes at bottom right of the Triggering pane allow the user to set the pre trigger and post trigger periods in seconds These values determine the minimum length of time during which data will be saved before the trigger condition occurs and after it has lapsed Regardless of the intervals chosen the data in the triggered streams will begin on an integer second 7 4 Mux Channels G ralp digitisers provide a range of slow rate auxiliary channels for reporting the system s state of
115. nchronisation will result in a discontinuity in the data received From this point the control process will attempt to keep the internal time base synchronised to the GPS 1 pulse per second PPS output by adjusting a voltage controlled crystal oscillator First it alters the voltage control to minimise the error Next it attempts to minimise both the phase error i e the offset between the internal 1 Hz signal and the GPS and the drift the frequency error relative to GPS During the control process the system reports the measured errors and the control signal applied as a PWM Pulse Width Modulation value During the initial coarse adjustment stage only the coarse voltage control is used and no drift calculation is made If the system is operating in a similar environment to that when the system was last powered most importantly the same temperature the saved control 68 Issue L August 2015 User guide parameters will be appropriate and the system should rapidly switch to the fine control mode The system reports its control status and parameters each minute with error measurements given in nominal timebase units In a stable temperature environment the system should soon settle down showing an offset error of only a few thousand average error lt 100 microseconds and a drift rate under 100 counts lt 1 in 10 6 2 2 Graphing status information Newer G ralp digitisers output a status block every f
116. ncludes facilities for monitoring status streams the status of your network the integrity of incoming data and for accessing the serial console of attached digitisers 6 1 Terminal windows Scream can open a terminal session with any connected digitiser or EAM either using a serial link or over the network if the server permits it see Section 5 2 on page 56 6 1 1 Communicating with instruments To open a terminal session with an instrument right click on its entry in the left pane of Scream s main window and choose Terminal from the pop up menu ie meam File View Windows Help Del Configure Terminal Dialup n DFB stream butter PC Time UTC 10 18 19 Scream automatically negotiates with any other G ralp devices or software in the chain until it reaches the one you want to contact and then attempts to place the target digitiser in command mode If this fails press 641 f in the Terminal window to enter command mode manually If you see an ok prompt as shown below the digitiser is ready to receive commands Otherwise press ENTER to display a prompt You can now type terminal commands into the window August 2015 63 Scream 4 5 ES Terminal Coml6 F2 F3 F4 F5 FR FF FS F9 F10 F11 Fl2 E 2s Options GEL C 4800 CHC 5ST Command Mode O blocks in buffer 56 blocks free Guralp Systems Ltd DN FW w l06 mgs f0 05 10 Build 46 ok C Z8 arrow keys let you browse
117. ndow Whilst the Details window is open the mean value is displayed on the WaveView window as a dotted horizontal line whilst the maximum and minimum values are displayed as solid lines You can also change the offset of a stream with the keyboard With the mouse over the Details window pressing the D and arrow keys P P moves the current stream up or down by one pixel whilst and aee move the stream by the height of one lane This feature lets you 38 Issue L User guide compare streams by placing one directly on top of another The lane used for selecting the streams stays the same 4 2 5 Spectrogram Scream can perform real time spectral analysis on incoming data To enable this feature right click on the stream of interest in the Waveview window and choose Spectrogram from the pop up menu fo Scream 4 5 File View ima I 4b oae H T EE te BB Time cursors Ampl Cursors 01 54 47 01 40 01 50 eee A rl The vertical axis of the spectrum is linear with the Nyquist frequency half the sample rate at the top and 0 Hz DC at the bottom The colouring is logarithmic giving a large total range whilst retaining sensitivity at low signal levels The width of the spectrum can be changed in the Display options pane of the Setup window The and eB keys adjusts the colour contrast of the spectrogram The spectrogram supports zooming in by dragging a selection on the frequency scale To apply the zoom
118. nen i 9 23 Initial Gontieuration all plal orn Serisini E ETE Ea 10 SNE TWAT WAG OW iecoris E E N 11 Bek Deal OE aa a a Audeamceden eis 11 E CALM NUT LECT ics E E A cami saat eas taae eae E 14 3 8 LHe SOUTCE INCE arisiiiayerinatvaenuissanidrontieubeweiseal iin A E 14 Cg EICON tyateates cates E ena oetessecemenn eh a 15 BAe TING streami s borreia A O AEAN 16 SA SOTONE ONIONS aen E E O 18 Io THe Statue DaT raaro N N A E 19 OVC Will O55 Oa Wl S oraa aE E TANA E E E TATE E E aes 19 Saf COMMOCCTING 16 ANS PUTMCIN Sree aE A T Oe acte 21 Seok Orsi NAGI E o aM Clan tc A E A E tart ant nen cee Moreen ener nr Te ere 21 38 LELI MPLOS picctessving ces aniacs E EOE OTON TONO 25 KOLD U O PEE E E E I EAEN N A es 26 4 WAVEVIOW WINdOW Sorini aranna T LAAEN ETIR 27 AGT NV MEN N ATE O N r NO O Oo sbibieda 28 ATV Zooming mand OUl yerina E O E OEO 28 42 Makine measure menl o erare aai o E A 29 PEOTI a E T O O 30 nA E EE a e E R E A EEA EI EA EET P E TAE E ES 30 ERO PIT OMO aa a N A EA 31 KECO ICOS a TT A 34 74 Weak GOMO ME M nna E AR 35 User guide AyD SUC aah TUCO S E EE A iasuen terete merece A 36 A Aiden yine Sea Saana e adn ales T oe he aan emestate i NGtNeh af tanaNesaewotioniesien 37 4 2 2 Changing the appearance Of StrEAMS cccsesesscceeeeseeeccceaeceeaeeeeaeecesaeees 37 ES SGA IGS LC ANS scsi apalaer eects lesen N Meanie embers aos 38 4 2 4 Viewing offsets ranges and averageS sssserssssscerssssseresssseresssserrsssersse
119. new IP address and port as for Add and click To remove a client from the list right click on it and select Delete The Scream server must store a history of the data transmitted in case the client does not receive all data Scream versions prior to 4 5 used a memory buffer for this purpose which was relatively small and only offered a small amount of backfilling to the clients Starting with Scream 4 5 the user can specify a backfill buffer that is stored on disk and can thus be very large The Server Buffer page allows the configuration of the size and location of this disk based buffering Za Network Control My Cent My Server Server Butler TCP server active i Enable disk based buffering of data transmitted on the network Directory for butter files CcAscereamBackfillarchives Browse i Move files from previous directory may take time Buffer size 14 Days Estimated size 3 9 Gbytes Apply Status refreshed every minute click to refreshi Directory in use CsSacreanm B ack hillArchivess Number of files 1 Total file size 36 2 kbytes Oldest data 25 11 2010 18 48 24 Current Te Rate averaged over the last minute 3 4 kbytes sec Fort used for all network communications 1567 If the disk based buffering is not enabled Scream will use the memory based buffering which was used in previous versions Issue L User guide 5 3 Server Buffer It is recommended that the user ensure
120. ng and NOMMC AMO Missi iecsdccseasiadcrneriwadanecwusucds eena EEEE REE ee 126 Ve PTO TLCS ruorin E T eaean oon 126 1A 2 Heath WOU MCA suas sistty awatiensanlaptaurl TAT seein ens 128 12 Extending Scread Mlanao iaoei AEE E 130 1 T Installing new exten slon S rsson aT EE 130 Z RUNNIN CRUCTIS ION S eee sade edad ei a aa a a a 131 13 Key DO aT sDOrECU Siae n T E E 133 13 1 The man WNdOW crrr ae OA seaman siatidantetinnaiites 133 13 2 Waveview WINAOW S renier E TE E E ER 134 Ra Deris WANG OW gonane E E A deus 135 PA INSIGE STEAD a A E E E ieee 137 14 1 Command IME Op UON e NNS 137 e E NE SET e EA as TA AS A E E E E aes 138 14 3 File and directory locations seseicrsiccaiaieina n EAEE AN 138 1A 3 sO WS Vers IO aa a a A 138 E E O a A E E E T A E 139 14A POR MESS 1S CS oes a R TE E S E E E E 140 A REVISION DISTO Varir A E E N 142 August 2015 5 Scream 4 5 1 Introduction Scream 4 5 is a software application for seismometer configuration real time acquisition and monitoring It runs on Linux and Windows from 98 onwards It can be used for decompressing viewing printing recording transmitting and replaying GCF data from any G ralp Systems digital device Scream 4 5 can be used in two modes as a stand alone real time application for real time data acquisition including a network server and client file replay recording and analysis tools or as a helper application for viewing pre recorded GCF files which also
121. nning the data you are viewing may be replaced with newer blocks 8 When all files have finished playing back the Replay Control window will disappear You can continue to work with the data that remains in Scream s memory buffer 9 3 2 Reading hard disks You can use Scream to replay streams direct from G ralp Systems portable DFD disks These are normally FireWire or USB e g for CMG 6TD disks but SCSI is also supported Up to 100 disks can be connected to the system at once depending on your operating system and hardware To read a disk directly Scream may need administrator root privileges Caution When a DFD disk is connected to a Windows PC the operating system will not recognise the file system and will offer to re format it Do not allow it to do so you will lose some data from the disk and make it hard to recover the rest If you accidentally find yourself in this position please contact support for advice 1 Choose File gt Replay SCSI disk from Scream s main menu If Scream cannot detect any suitable interfaces this option will be greyed out 2 Scream will now search for DFD disks and search for data streams on each disk it finds When it has finished a Select streams for Replay window will open 3 Select the stream or streams you wish to replay and click 0K August 2015 115 Scream 4 5 4 The streams will appear in Scream s main window as a group and the Replay Control window wi
122. ns you have specified for Granularity although the Granularity options will still work You can set your own header fields by preparing an EXPORTINFO section in the scream ini file See the MiniSEED section on page 107 for more details The specifications you can use are sta chan aux calib calper hang and vang Each specification sets the header field with the same name If you miss out a specification Scream will fill in the default value 9 2 6 CSS file format Scream supports recording in the CSS 3 0 flat file format using the same rules for file and directory names as for GCF files see above but using the extension w together with a wfdisc table stored in the Base directory w files in CSS format must represent a contiguous period of time Ifa discontinuity is detected in the incoming data stream then the file which is currently recording will be closed and a new file opened with a file name and time stamp matching the start of the new file This operation will take place regardless of the options you have specified for Granularity although the Granularity options will still work Samples are stored in the w files as signed 32 bit integers s4 or i4 using the Byte Order you have specified Scream updates the wfdisc table whenever data are added toa w file August 2015 111 Scream 4 5 You can set your own header fields by preparing an EXPORTINFO section in the scream ini file See the Mini
123. nt tee Ai tet actin ae dees cee Gita eae T areas 71 Ese pl a E T E tate atecamuaten E cae ssauete ee 72 CB OS Ea E area EE N EE A T OAE 72 Bs D 221e Ts EP E A A E T E E 72 6 4 The View o Wild OW vesireitin eae aA A E O 74 7 COMMEUTING dicilseT Siiner R R A E Mekeomees ma Sroneonae 76 E a SC UMN E E E I N A E E E E O 77 7 2 CUE ES ETON i E D SE E E IE E es E E T E E soe 78 Th WT OC EMI AEE E E A E A E E E A T 80 August 2015 3 Scream 4 5 gS oi leo EA LT tree remeron Teeter nnn emir rete ter Trier iret cerenrreen Trt eer Tr errr try 81 Dic Bio NG ONGC EEE E trata E E eset sialic ene A 85 7 SiO EXOT AR IO Se TUN assaf a dasa dace unicads taueuna sued nagar enc aiuto 85 7 3 4 Pre trigger and post trigger reCOrdinG cccccccsseeccccseeeceeaeeeeceeaeseeeeeeeeeens 86 pe NUX GMINNE lS rar terrence te A 86 TD PON S oa a aderutia uns eie vols oie nein a nnea edocs 87 8 Conirolline Gi SiISETS jevscsesscescsrantoxceandeorwanseaatmenencamensestdeansaretenaateasaieeneussumabarvantdervaunts 89 Ciel 1 A A E T E E E E E E A ee Anise anteater tena eens 89 e AAR VS OS PM S EE A E E A T EE A ET AE 90 8 3 Cal DPA Oeean AE E A EET OEO 91 EME COTO et aha tp a a aaa oseeneee ied te 92 Be 1D Aba TOW erarnan are EEN EEE NEE O AOE 93 eDIL TET e T NA ae 94 DA PILING earren saeaencnpice in cides donde sa resnas es endetuuaexe setae uaebetes 95 oe Firs 6 ed OF iv WB cheer eee ete Ren ere ne nS eee ene eee 96 eI Da E wil cMeatad eal een yeh aeare ga sem
124. ntations of the GCF format Newer digitisers use this byte to provide information about the filter chain configuration of the digitiser among other things When the byte is non zero Scream will interpret it if it can and display the corresponding filter set up Refer to the G ralp Systems technical notes available on the web site for more details Sample Rate and Compression The current sample rate and compression code also displayed in Scream s main window Number of Records GCF blocks are divided into 4 byte records Each record can contain 1 2 or 4 samples depending on the current compression factor Since all GCF blocks are 1024 bytes long allowing for the 24 byte header a full GCF block should always contain 250 records However it is permissible for a GCF block to be only partially full RIC Calculated The Reverse Integrating Constant effectively the value of the last sample in the block and its calculated value from the differences in the block Checksum Calculated Received and calculated checksum values for the data in the block If these differ Scream assumes the data are corrupt and asks the digitiser to re transmit the corrupt block If you are using a simplex communications link this will fail and the data block will be lost Scream also logs any errors it detects For more information on Scream s logging system see Chapter 11 on page 126 August 2015 75 Scream 4 5 7 Configuring di
125. oc LL or SYSTID net NN Loc LL 108 Issue L User guide where SYSTID is the System ID STREAM is the Stream ID SERN is the serial number SSS is the desired station name CCC the channel code NN is the 2 character network code and LL the location code If you use a SYSID SERN line Scream will apply it to all streams from the digitiser with that serial number filling in the channel code automatically If you use a SYSID line Scream will apply it to all streams from any digitiser with that System ID filling in the channel code automatically and taking the Station Name from the digitiser s serial number If both instrument SYSTID SERN and stream SYSID STREAM lines are present the stream lines will override the instrument lines Likewise a SYSTID SERN line will override a line with just SYSID if both are present This allows you to set default values for an instrument or network in a single section If you omit a specification Scream will fill in the default value The loc specification is optional 9 2 3 SAC file format Scream supports recording in the SAC format using the same rules for file and directory names as for GCF files see above but using the extension sac instead of gcf Files in SAC format must represent a contiguous period of time If a discontinuity is detected in the incoming data stream then the file which is currently recording will be closed and a new file opened with a file name and
126. of stream high sample rates low sample rates and status streams The distinction between high and low sample rates is set by the number in the Sample Rates gt box the remaining boxes give the number of hours of data that Scream should combine into a single file for each type of stream In the example above streams with a sample rate of 20 samples sec or above will be recorded in files with up to one hour of data per file lower rate streams will be recorded in four hour files whilst a new status file will be started every twelve hours You will need to choose a Filename format see above which gives each file a unique name If you prefer to set a limit on a file s size rather than its duration choose Kilobytes from the drop down menu instead of Hours or Minutes and set as appropriate Post processor This option allows you to specify a program which Scream will run every time it closes a file The name of the file is passed as a parameter You can use this feature to interface to other analysis or archival systems for example you can use FTP or email to send files to remote data centres you can perform format conversion using a third party utility You can post process file data headers to add site specific information 9 2 1 UFF file format Universal File Format UFF is a commonly used interchange format for seismic data Two types of UFF format are supported ASCII and binary where the extension ufa denotes the A
127. on Waveview windows are fully described in Chapter 4 on page 27 Scream extensions are covered in Chapter 12 on page 130 1 1 1 Diagnostic features Scream performs extensive checks on all incoming GCF data and logs errors to disk You can see details about the incoming data including any errors detected by Scream using ShowInfo Network Control Summary and Status windows These are described in Chapter 6 on page 63 Scream also provides logging facilities and can e mail operators when a potential problem is detected See Chapter 11 on page 126 1 1 2 Digitiser configuration Scream provides an easy to use graphical interface for configuring G ralp Systems digitisers Output streams triggering calibration and mass control can all be managed by Scream See Chapter 7 on page 76 and Chapter 8 on page 89 for more information on these features 1 1 3 Networking The real time Scream application provides a built in network server and client for data in GCF format A Network Control window provides full control of Scream s network connections The Scream server can be configured to allow remote clients to configure digitisers and control instruments over the network Chapter 5 on page 53 describes the networking functions Scream offers 1 1 4 Recording and replay You can instruct Scream to record data to disk with the click of a button Scream supports GCF SAC miniSEED SEGy PEPP SUDs and GSE formats among ot
128. on by selecting one or more streams using either of the methods above and choosing the August 2015 33 Scream 4 5 34 extension from the pop up menu See Chapter 12 on page 130 for more details Click the Pause icon J again to return to real time mode If you have changed the zoom settings the window will return to its previous state with the window once more following the real time data 4 1 6 Other icons Click the Block Boundaries icon to display a dotted line at the end of every GCF block displayed in the window oa WaveView A m fx The number beside each line is the number of bits used to store each sample in the block A fixed length GCF block with 8 bit samples which can encode differences up to 127 counts can store 4 times as many samples as a block using 32 bits for each one encoding differences as large as 4 294 967 296 counts Clicking the icon again removes the block markers Block markers can also show icons for re boots and re syncs Click the Zero Streams icon to set the offset of each stream in its lane so as to centre its mean value over the time period displayed If you do not want a particular stream to be zeroed when you click this icon right click on the stream beforehand and select Locked Offset This option is particularly useful when first setting up an instrument since its output is often offset by a constant DC voltage When Scream is used as a data viewer the Pau
129. otated with respect to the other 132 Issue L User guide 13 Keyboard short cuts 13 1 The main window Certain menu options are available from keyboard short cuts a Select all streams Em i Open the ViewInfo window em Open the Network Control window a GS Open the Setup window em Open the Summary window e Open a new empty Waveview window a Open a new Waveview window on the selected stream s If an entry in the left hand pane is selected you can also navigate the device tree with the arrow keys Move to the previous entry Move to the next entry Roll up the current entry Unroll the current entry Dell Remove the current entry if not Files Local or Network and any sub entries Also clear any data from streams under this heading from the stream buffer You will not be able to get data back after they have been removed from the stream buffer except by replaying recorded data If instead the right hand pane is selected the keys perform the following actions August 2015 133 Scream 4 5 Move to the previous stream co Move to the next stream it Ea Select to the previous stream Open a new Waveview window on the currently selected streams Dell Remove the currently selected streams and clear their data from the stream buffer 13 2 Waveview windows 134 Most of the functions of Waveview window
130. ovide access to their own serial ports over the network To connect to the serial port of a remote Scream server choose Remote Serial and fill in the IP address of the remote computer together with the port name or number Click zo You will need to enable serial access on the Scream server to use this feature In the My Server tab of the Network Control window tick Allow remote access to Com ports If your Scream server is a CMG EAM you will need to ensure that the Disable terminal access check box is not ticked in the server configuration dialogue Similarly if your Scream server is a DCM running native firmware i e not upgraded to run Platinum firmware you will need to set the option datatransfer scream server allowserialaccess to yes This option is most useful for accessing serial ports on a remote computer which is not producing GCF data If a remote port does emit GCF data it will appear in the source tree as normal and you can open a session with it by right clicking and selecting Terminal To connect over a TCP IP terminal link either to a remote Scream server or to a TCP terminal device e g a serial to network converter choose TCP IP and fill in the IP address of the remote computer Click aK The terminal window will then open as described above 6 2 Digitiser status streams 66 All G ralp digitisers have a separate stream for reporting information about the system such as their GP
131. p a lock on the satellites If the top half is red the instrument has not reported a satisfactory timing fix for over an hour This will happen if the instrument has reported failures as above but also if it has not reported anything If you have set the GPS system to power down for intervals longer than an hour the icon will turn red even if the system is working normally If the bottom half is red the instrument or one of its components is running with a mass position over 15000 counts roughly 50 of its travel You should re centre the component if possible to avoid clipping after large ground movements If the instrument appears as a green box j the instrument has sent status blocks to Scream but no data The box represents a G ralp CRM SAM these modules store or forward data from other instruments but occasionally produce status blocks themselves If a digitiser produces a status block before any data perhaps because you have configured very slow data rates or are using FILING or DUAL transmission modes see Section 8 5 on page 93 it will temporarily appear with this icon 3 4 The stream list If Network is selected in the source tree the right hand panel will list all the data streams which Scream receives and is not ignoring If an entry in the source tree is selected the stream list will only show the streams beneath that entry selecting a serial port will only show streams from instruments connected
132. pectra The old event spectrum will be replaced with the new one 6 If you want to change the background spectrum follow steps 1 2 and choose No when you are asked if you want to overlay the spectra The old event spectrum will be erased and the background spectrum will be replaced with the new one Now follow steps 3 5 to overlay the spectrum of events as desired 4 3 3 Display options The icons at the bottom left of the Filter Design window change the properties of the graph The Log Lin selection box allows you to choose a logarithmic or linear time axis The magnitude axis is always displayed in dB and is therefore logarithmic Enter a value in the n sps box to display a time range suitable for streams at that rate The graph displays a four decade frequency range up to the Nyquist frequency i e half of the sample rate When power spectra are being displayed on the graph there is an additional selection box to the right of the Log Lin icon The power spectrum calculation uses the Welch averaging periodogram algorithm This algorithm produces frequency graphs by splitting the range into windows of a certain size 46 Issue L User guide You can alter the size of window used by changing the value in this selection box Using a smaller window size produces a smoother graph at the expense of losing information about lower frequencies To examine lower frequencies you will need to increase the window size
133. ple Rates 4 Status Files 12 The options you can change are Base Directory This specifies the root directory in which data files will be saved There are useful notes about the choice of directory in Section 2 3 on page 10 Files for each stream are stored in sub directories below the directory specified The sub directory structure is defined by the file name format Filename format This allows you to describe how you want files to be named by entering a format specifier The string you enter is used to construct the file names for all files Among the specifiers you can use are August 2015 103 Scream 4 5 YYYY the year number e g 2003 M the month number 1 12 D the day of the month 1 31 H the hour 0 23 N the minute 0 59 S the second 0 59 R or J the day number in its year 1 366 X the date represented as an 8 digit hexadecimal number this allows a complete date to fit in the DOS 8 3 format for compatibility I the System ID T the Stream ID e g MYDMZ2 E the Serial Number of the digitiser as given in the first 4 characters of the Stream ID e g MYDM You can change this Serial Number when you reconfigure the digitiser so it does not always correspond with the G ralp Systems assigned serial number C the component identifier Z N E M etc P the sample rate in samples per second A the name of the stream if you have set a mapping see Section 4
134. ple rates below that specified in the Files granularity field Auto Record Enable for Status Streams Tick this box to make Scream save all local status streams automatically Auto record downloaded streams If you have selected Auto download on heartbeat you can tick this box to instruct Scream to automatically record to the local hard disk any data that it receives as a result of a download instruction that Scream issues see below Auto download on heartbeat If a digitiser has been configured to record data into its own Flash memory only FILING mode it transmits heartbeat status messages With this box ticked Scream will listen for heartbeat messages and ask the digitiser to send saved data whenever it receives one This option should ONLY be used when the connected digitisers are in FILING mode or in DUAL mode with no continuous streams enabled Close Files after timeout Normally Scream keeps GCF files open whilst it records them This can be a problem in some situations because no other program can access the file whilst it is open To make Scream close the files after each write tick this box and enter a time in seconds in the field which appears Scream will close the file if it has not written anything to it for this number of seconds The lower section tells Scream how to use its hard disk space If Stop on Disk Full is selected then Scream will stop recording data once it runs out of sp
135. quashed relative to the window On a 75 DPI screen or printer at a scale factor of 5 an inch 25 4 mm will correspond to fifteen seconds of data on a 300 DPI printer the same scale factor would produce an inch of output every sixty seconds 10 Make any other choices you require offsets block boundaries etc 11 When you are happy with the appearance of the window click the arrow beside the Print icon amp to display a drop down menu Choose Continuous Print If the Continuous Print option is greyed out check that you have not enabled continuous printing for another Waveview window The printer will output a short banner after which it will begin plotting the data 12 To stop printing click the Continuous Print icon again The display settings for the window will now continue to be reflected in the printout If you want to examine the data yourself you should Duplicate the Waveview window and minimize the one that is 124 Issue L User guide printing so that the scale and other settings are not changed Printing will continue in the background Whilst printing is in progress do not attempt to print any other documents through the operating system If you need to do this you should temporarily stop printing from Scream and restart when you are done 10 2 1 Port capturing Under Microsoft Windows Scream can only print in continuous mode from a named port on your local machine However Windows can map
136. ready exists it is overwritten Finally enter the name of a directory in the text box or click Browse to find a suitable directory for saving the log file s See the notes about choice of a suitable directory in Section 2 3 on page 10 August 2015 127 Scream 4 5 11 2 E mail notification You can also instruct Scream to send e mail to warn the operator when particular events happen To set this up choose File gt Setup from the main menu and move to the Email Options tab a Setup Com Ports Recording Files Display Print Stream Mapping SMTP Server Recipient Events to Monitor Digitizer re boots i Data Discontinuities FRe Syncs W Scream Start Stop SAM disk full W Scream recording stopped Digitizer Trigger Report W GFS Control Timeout Mass Position ower 50 W Disk Full warming ower 30 00 X Cancel ff Apply Help To be able to use e mail you will need access to a mail SMTP server which will accept messages from the address Scream SMTP client your hostname Fill in the IP address or hostname of this server in the SMTP Server box Enter in the Recipient box the e mail address to which you want the mail sent The events you can monitor are Digitiser re boots Scream can recognise the boot up status messages of a G ralp digitiser or digital instrument These are normal after a power cycle or when a new configuration is uploaded to the digitiser After a re boot you s
137. ream installation directory in GCF format Scream records files for each stream separately which it puts in that stream s own directory This directory may contain one or several GCF files Scream has a number of options which allow you to change the way data are recorded and filed From the main window select Setup from the File menu to open the Setup window Click on the Recording tab 9 1 Recording Display Print Stream Mapping EMail Com Ports Recording Files Event Log Streams i Auto Record Enable for High Sample Rates i Auto Record Enable for Low Sample Rates i Auto Record Enable for Status Streams Auto Record downloaded streams Auto download on heartbeat Close Files after timeout Recording Mode f Stop on Disk Full o Ring Ber Leave 5d Mb free disk space Stream Buffer Only X Cancel ff Apply Help August 2015 101 Scream 4 5 The upper part of this pane allows you to instruct Scream to record various streams automatically Scream will start recording all relevant streams immediately but will also remember the settings for the next time it is started up Auto Record Enable for High Sample Rates Tick this box to make Scream automatically saves all local data streams with sample rates above that specified in the Files granularity field Auto Record Enable for Low Sample Rates Tick this box to make Scream automatically save all local data streams with sam
138. ream running on a computer which is not directly attached to any instruments It receives data from a single network source MACALLAN1 which has two serial ports Com1 and Com2 These ports are attached to the instruments BHOLE BH05 and GURALP DA79 respectively if your installation uses a CRM Combiner Repeater Module or EAM connected to a serial port several instruments may be listed under a single serial port icon The MACALLAN1 server icon has been unrolled to reveal the serial port icons You can roll up icons and save space by clicking on the El box You can tell Scream to ignore a particular instrument by right clicking on its icon and selecting Ignore When you do this Scream will discard any blocks it receives from the instrument They will not appear in the stream buffer or be recorded to disk Select Ignore again to stop ignoring the instrument 3 3 1 Icons Instrument icons change colour to provide you with a quick overview of the instrument s timing and mass position status If both halves of the instrument icon are clear 8 Scream has not received any information from the instrument since the program started August 2015 15 Scream 4 5 If the top half is green the instrument has reported a satisfactory timing fix If the top half is yellow amp the instrument has reported a gap in the timing stream This will occur if the GPS signal deteriorates to the point where the receiver cannot kee
139. rge window which takes some time to scroll especially at a high horizontal zoom factor Scream may not be able to finish drawing new data before it needs to scroll again If this happens Scream will delay scrolling until it can display in real time once more To prevent this decrease the time scale If you have paused the window with the I icon you can zoom into an area of interest by dragging a rectangle across the streams Scream 28 Issue L User guide displays the time span in the top right corner of the rectangle and the number of counts in the bottom left corner You can drag across one stream or several the resulting window will still include all streams Whilst the window is paused you can also adjust the view start and end times by dragging the ends of the horizontal scroll bar button at the bottom of the window 4 1 2 Making measurements Click the Time Cursors or Ampl Cursors button to display a pair of vertical or horizontal cursors Each cursor has a square at one end which can be dragged across the Waveview window to measure features If two cursors coincide you will only be able to see the squares 3 WaveView Sele I EB ononon 1 19048 Hz 23 296 The distance between the cursors is given in the text of the Time Cursors or Ampl Cursors icon in seconds and Hz or counts You can have both vertical and horizontal cursors active at the same time Because the limit of accuracy of the cursors is one
140. ry buffer see Section 4 4 1 on page 48 You cannot return to the main window by clicking on the stream identifier in the context menu You cannot drag streams from one WaveView window in data viewer mode to another one or to a real time Scream application Everything on the command line after view is treated as a file specifier If you need to issue other options place them before view i configuration file Use configuration file instead of scream ini to load Scream s settings FlashLED Flash the Scroll Lock keyboard LED each time a block is received NoSplash Do not display Scream s splash screen at startup V31 Force network packets to be in Scream 3 1 format Since Scream 4 n is backwards compatible with Scream 3 1 you should not need to use this option August 2015 137 Scream 4 5 disknn image file Treat the file image file as a raw DFD disk attached to port nn noaspi On Windows 98 95 and ME Scream uses the Adaptec ASPI drivers provided with the operating system to control SCSI devices On other operating systems the ASPI drivers are not available so Scream controls the devices directly Use this switch to force Scream to control devices directly even if the ASPI drivers are present 14 2 The calvals txt file If a file named calvals txt exists in the same directory as Scream s executable scream exe Scream will look there for suitable calibration values Note O
141. s 1000 secs 100 secs 10 secs Log Auto Apply z Spt Save OK Lancel Apply From top to bottom the window contains the parameters of the current high pass red and low pass green filter in numerical form a graph of the response of the current filter showing the 3 dB level and corner frequencies at bottom left display settings for the graph and at bottom right control buttons for the window 4 3 1 Filter parameters The filter parameters are shown at the top of the Filter Design window August 2015 Select Highpass to switch on the high pass filter and enter the value of the corner frequency required in either the Hz or the Secs seconds box You are not allowed to enter a value of 0 in either box 41 Scream 4 5 While the cursor is in one of the frequency boxes pressing the and keys will nudge the corner frequency up and down Alternatively change the corner frequency by clicking on the graph with the left mouse button If the low pass filter is active and you click to the right of the low pass corner both frequencies will be moved If the frequency you want is not shown in the window it may be above the Nyquist frequency for the currently selected sample rate Change the value in the n sps box at the bottom left and try again Change the order of the filter by entering a number in the nth Order box iS Filter Design Sele W Highpass PE i Hz Wp z i Hz Gain dE 4 th Order
142. s can be accessed by a keystroke This is particularly useful if you have removed the window decoration with the No Caption menu option al Increase the amplitude scale 4 Decrease the amplitude scale Increase the time scale gt Decrease the time scale DI Create a duplicate window as a copy of the current WaveView window with all settings the same Toggle the bandpass filter on or off a EF Display the Filter Design window Section 4 3 on page 40 N Null zero the offsets of all unlocked streams in the Waveview window Issue L User guide ol Toggle overlay mode on or off In overlay mode all streams are drawn in the centre of the window rather than having separate lanes o GP Toggle the spectrogram of all streams on or off Redraw the contents of the Waveview window Toggle no caption on or off ctrl bell Remove all streams from the Waveview window There are also keys which affect only the stream containing the mouse pointer These are equivalent to the stream actions on the context sensitive menu Del Remove the active stream from the Waveview window Display the Colour selection dialogue box for the active stream D Open the Details window for the active stream or close it if it is already open s Scale the active stream cr Scale all other streams to have the same peak peak as the active stream P Toggle the spectrogr
143. s holds the last 256 blocks generated and if a client fails to receive a block it can request its retransmission If you expect breaks in communication between the instrument and its client to last more than 256 blocks or if you want the instrument to handle breaks in transmission rather than relying on the client to request missed blocks you should use 94 Issue L User guide ADAPTIVE mode if you want data to stay as near to real time as possible but do not mind if blocks are received out of order or FIFO mode if you need blocks to be received in strict order but do not mind if the instrument takes a while to catch up to real time 8 5 2 FILING Flash storage Instructs the digitiser not to transmit blocks to clients automatically but to store all digitized data in the Flash memory If you have chosen the RECYCLE buffering mode see below the memory is used in circular fashion i e if it becomes full incoming blocks begin overwriting the oldest in memory If the WRITE ONCE mode is active the instrument will switch to DIRECT mode see above when the memory becomes full Heartbeat messages When in FILING mode an instrument transmits heartbeat messages over its data port These short messages take the place of data blocks and ensure that programs such as Scream know that an instrument is present If your digitiser is in FILING mode Scream will displays a slider at the bottom of the tab Moving this slider
144. s there is sufficient disk space available on the drive selected to hold the buffer The buffer size can be specified in either time Days Weeks Years or in terms of disk usage Mb Gb Tb 5 4 Gap recovery In addition to the normal UDP data protocol Scream has facilities for attempting to recover missing data When Scream receives a block of data that indicates a gap it connects to the server over a TCP link from the same port Once this connection is made Scream requests the missing data and if they are available the server transmits them over the TCP connection The UDP data stream is unaffected Server intemat Client Server firewall firewall Client UDP data If you are using a firewall on either side of the connection and want Scream to be able to recover missing data in this way you will need to unblock the relevant port for both UDP and TCP traffic 5 5 Retrieving data over dial up links Scream can manage the retrieval of data from your installation using modems attached to your local PC This feature is intended for use in conjunction with the triggering capabilities and Flash recording modes of G ralp digitisers 1 Click File gt Setup on Scream s menu bar Select the Com Ports tab August 2015 59 Scream 4 5 Display Print Stream Mapping EMail Com Ports Recording Files Event Log Port Baud Aate AutoBaud ACKs NACKs BRP As T70 115200 lw Iw Iwo fw 200 Dialu 60 Yo
145. se icon II is replaced with a Restore View icon H Click this icon to reset the time and amplitude zoom settings to their initial values i e to display the entire selected data set within the window Issue L User guide 4 1 7 Context menu Right clicking inside a Waveview window brings up a context sensitive menu in two sections The upper section of this menu contains options which affect a particular stream see below Options in the lower section affect the whole window Select Background Colour to change the background colour for the window Select Label to change the title of the window This also changes the name of the window s entry in Scream s Windows menu and is used on printouts see Chapter 10 on page 119 Select Clear Window to remove all streams from the window This does not remove the streams from memory you can retrieve them by dragging from Scream s main window onto the now empty Waveview window Select No Caption to remove the title decoration and toolbar from the window To maximise the screen area occupied by streams first maximise the Waveview window then choose No Caption You can still use the mouse wheel or keyboard short cuts see Chapter 13 on page 133 to perform the actions of icons on the toolbar Select Duplicate to open a new Waveview window identical to the current one If you have renamed a stream using Stream Name Mapping the new window will use the new name Select Over
146. se sort orders You can also sort the list by Stream ID or SPS by clicking on the relevant heading click again to reverse the sort order 3 5 The status bar At the bottom of Scream s main window is a status bar containing summary information about Scream s state The server address from where the data for the currently selected instrument is being received The number of different data streams currently accessible from the window including those that have been rolled up The amount of memory currently being used by Scream s stream buffer You can change the maximum size of the stream buffer from the Setup window see Section 4 4 10on page 48 If this number approaches the capacity of your computer it may become slow and difficult to use and The current time according to the local computer not the timestamps of incoming data To disable the status bar deselect View Status Bar on the menu 3 6 Viewing streams Double click on one of the streams to open a window for viewing the data or right click on it and select View Alternatively make a selection of streams from the list and double click on the selection or press ENTER August 2015 19 Scream 4 5 Data streams are opened in a Waveview window i Waveview OF x 165536 X 2 da PE wee FE amp v Time cursors Ampl Cursors 2005 05 21 00 17 26 00 14 00 15 00 16 This window allows you to see real time data coming in You
147. st trigger data Scream will attempt to include these as well If two triggers from the same digitiser overlap Scream may show both triggers in the Waveview window because the point where one trigger ends and the next begins is essentially arbitrary Scream can only display data which is still in its stream buffer If the buffer is full and the data have already been purged double clicking on a trigger will show a blank window To view the data you will need to retrieve it from the hard disk or your recording system and replay it into Scream August 2015 73 Scream 4 5 The columns contain the following information Start The start time of the trigger prefixed with a if the trigger occurred since the last time you reset the Summary window End The end time of the trigger Type What caused the trigger R if the STA LTA ratio exceeded the set threshold L if the level exceeded the threshold E for an external trigger if the digitiser supports it or S for a trigger generated in software You can also open the Trigs window by right clicking on a digitiser s entry in the main window and selecting Triggers from the menu 6 4 The ViewInfo window Detailed header information from incoming data blocks is available from the ViewInfo window accessible by selecting Windows gt Info Display from Scream s main window ViewInta Source Com 3 ID character G Block Number 227 Block Size 824 System ID
148. supplied in the Scream program distribution 12 1 Installing new extensions There are two files that can reference a program extension screamglobal ini and scream ini The first is located in the installation directory of Scream and will affect all instances of Scream that run on the computer The second is the normal configuration file for each instance of Scream and so can be customised on a case by case basis The following steps can apply to either file but you only need to modify one To install a program extension 1 Place the program file in a suitable directory preferably one named in your PATH i e you can launch it by typing its name at a command prompt 2 Make sure Scream is not running and open the scream ini or screamglobal ini file see section 14 3 on page 138 for help finding this file 3 Look for a section beginning with the line custom 4 If it does not exist add the following lines at the end of the file custom SelectionMenu executable name executable name should be the name of the program if it is in your PATH and the full file name otherwise If you want the displayed menu entry to be different from the file name use the form custom SelectionMenu executable name displayed name 130 Issue L User guide e g SelectionMenu art exe ART 2 0 Analysis Package 5 If the line custom exists add the name of the new extension to the list after SelectionMenu separating
149. the digitiser include the line VPC sensitivity VPC stands for voltage per count measured in units of UV count This is sometimes given as LV Bit on the digitiser calibration sheet To set the sensitivity of the calibration channel include the line CALVPC sensitivity Issue L User guide as for the other digitiser channels To set the value of the calibration resistor include the line CALRES resistance G ralp Systems digitisers normally use a 51 KQ resistor CALRES 51000 To set the sensor type include the line TY PE model number C72 13 eles To set the response of the sensor include the line RESPONSE response type unit Some of the values you can use are given in the table below If none of these match the response of your instrument please contact support for advice Units Sensor Sensor type code yp V A CMG 5T or 5TD CMG 5 100HZ A DC 100 Hz response E CMG 40T 1 or 6T 1 CMG 40 1S 100HZ V 1 s 100 Hz response CMG 40T 1 or 6T 1 CMG 40 2S 100HZ V 2 s 100 Hz response S CMG 40T 1 or 6T 1 CMG 40 10S 100HZ V 10 s 100 Hz response CMG 40T 20 s 50 Hz response CMG 40 20S _ 50HZ CMG 40T 30 s 50 Hz response CMG 40 30S 50HZ V CMG 3T or 3ESP 30 s 50 Hz response CMG 40T 60 s 50 Hz response CMG 40 60S _50HZ V CMG 3T or 3ESP 60 s 50 Hz response CMG 3T or 3ESP 100 s 50 Hz response CMG 3 30S 50HZ V CMG 3 60S 50HZ V CMG 3 100S 50HZ V August 2015 23
150. the set up screen at any time by keying i The directories in which you choose to place these files must be writeable by you They will be created when needed if they do not already exist as long as the parent directory is writeable by you Configured paths are not parsed by any command shell so sequences such as home directory for Linux Unix users or tAppData the application data directory for Windows users will not do what you might expect As the data files can grow quite large Windows users who use roaming profiles should pick a location which avoids having to transfer these files over the network each time they log on or off Similar concerns may apply to Linux Unix users in complex network environments The directory used for storing incoming stream data is set using the Base Directory item on the Files tab of the set up dialogue For detailed control of the file names used see Section 9 2 on page 103 The directory used for storing logging information is set using the Directory item on the Event Log tab of the set up dialogue For more information see Section 11 on page 126 10 Issue L User guide 3 The main window When you start Scream you will be shown an empty main window pi Scream Ed Stream ID Rec Comp SPS EndTime Date RIC File View Windows Help el Network 0Kb stream butter PC Time UTC 13 18 34 Scream is now ready for you to start adding data sources
151. time stamp matching the start of the new file This operation will take place regardless of the options you have specified for Granularity although the Granularity options will still work Before you start recording SAC files you should ensure you have selected the correct byte order in the Recording tab of the Setup window By default Scream uses the SAC header field KSTNM to store the stream s System ID the Stream ID is output in the KCMPNM header field You can set your own header fields by preparing an EXPORTINFO section in the scream ini file See the MiniSEED section above for more details The specifications you can use are August 2015 109 Scream 4 5 110 net or KNETWK Sets the KNETWK network header field sta or KSTNM Sets the KSTNM station name header field chan or KCMPNM Sets the KCMPNM component name header field type or KINST Sets the KINST instrument header field STLA Sets the STLA station latitude header field STLO Sets the STLO station longitude header field STEL Sets the STEL station elevation header field CMPAZ Sets the CMPAZ component azimuth header field CMPINC Sets the CMPINC component inclination header field KUSERO KUSER1 KUSER2 Sets the appropriate user header field If you miss out a specification Scream will fill in the default value Status streams are recorded as plain text as for GCF files 9 2 4 SUDS file format Scream supports recor
152. to all spectrograms in the window August 2015 39 Scream 4 5 hold fen at the same time To zoom out right click on the frequency scale holding cel if necessary to apply to all spectrograms The example below shows data from a CMG 5TD which is sensing a signal of approximately 40 Hz green trace at the top The Red trace shows the N S component with the spectrogram zoomed in once and the blue trace where the spectrogram is zoomed in again to the 39 40 5 Hz region On closer inspection it can be seen that the signal frequency is changing over time which was not apparent from the un zoomed green trace bo WaveView cE a F i l 5 12040 a 4 O8s ka Tt e TB amp Time cursors Ampl Cursors 18 11 14 12 010 18 10 457TO S01 M4 ums 4 3 The Filter Design window The Filter Design window allows you to alter the appearance of streams in Waveview windows by applying low pass high pass or band pass filters Each Waveview window can have its own Filter Design settings To open the Filter Design window click on the arrow to the right of the Filter icon ft and select Design from the drop down menu 40 Issue L User guide Toe EE w Default Filter Custom Filter iS Filter Design DER W Highpass 0 03333333 Hz m Lowpass i Hz Gain dB 4 th Order 0 Secs Secs 10 0 50 100 oo D 1 a oh a 150 0 0001 Hz 0 001 Hz 0 01 Hz 0 1 Hz 10000 sec
153. to that port and so on The columns in the table provide useful information about each stream Stream ID A unique name for the data stream being a combination of six letters A Z and numbers 0 9 The first four characters of this name identify the digitiser and the last two characters identify the individual stream The first four characters are set by default to the serial number of the digitiser you can change this on the System ID pane of the 16 Issue L User guide Configuration Setup window see Section 7 1 on page 77 or from the digitiser s console The last two characters tell you the type component and output tap of the stream Z0 NO EO correspond to input channels Z N and E of the digitiser s SENSOR A port continuously output through Tap 0 Z2 N2 E2 correspond to the same input channels output through Tap 1 at a lower sample rate Likewise Z4 N4 E4 and Z6 N6 E6 correspond to Taps 2 and 3 Z1 N1 El Z3 N3 E3 Z5 N5 E5 and Z7 N7 E7 correspond to Taps 0 1 2 and 3 of SENSOR B when you connect a 6 channel digitiser 00 is the digitiser status stream notice zero sample rate M8 M9 MA are slow rate Mux channels reporting the sensor mass positions for the Z N and E components Section 7 4 on page 86 MB is a slow rate Mux channel used for user input or calibration signals on older G ralp Systems digitisers MC F are further Mux channels used for user input or the d
154. treams are recorded as plain text as for GCF files 9 3 Playback 9 3 1 GCF files To replay a stored GCF file or files 112 Issue L User guide August 2015 1 Select File gt Replay Files from Scream s main menu and select the data you want to replay or drag GCF files from a Windows Explorer window into Scream s main window You can also select directories and drag them into Scream s main window Scream will replay all the GCF files it finds in that directory Microsoft Windows will not let you select files from more than one window at the same time However you can use the Search tool to select files from more than one directory Open a window on the topmost data directory and click Search or press E File Edit View Favorites Q O A Tools Help JO search jy Folders i Address C Program Files Guralp Systems Scream4 0 data Search Companion x Name a Search by any or all of the below iteri All or part of the file name gch A word or phrase in the file Look in data When was it modified What size is it More advanced options Fill in your search criteria e g name contains gcf and click Search Ey Search Results File Edit View Favorites Q O Df Tools Help Pp search I Fetes Fn Address o Search Results Go Search Companion X Name There were 14 files found Did you find what you wanted Yes finished searching
155. u will see a list of all the serial ports available on your computer This example shows a computer with a single serial port COM3 which is attached to a modem 2 Make sure the baud rate and other flags are set up correctly for the modem and click _Dialup EM Uist settings M Sunday W Monday W Tuesday IY Wednesday M Thursday M Friday ig oo T 7 Limit Eachcalto 10 minutes M Saturday Additional modem settings o ee i a Issue L User guide 3 Enter the telephone number of the remote modem If you want to contact several remote installations in turn list their numbers one per line 4 In the right hand panel tick Every 12 hours and set the value to 12 5 Tick the Limit each call to box and enter a suitable call length Scream will also hang up if it fails to receive any data for a specified length of time Ensure that you allow enough time in each call to download all the new data given the sample rates and baud rate that you have chosen For example if the modem connection can achieve 19200 baud then a station outputting continuous 200 samples s data for 3 components would require a continuous connection to collect all the data If the data rate were only 20sps then the modem would only need to be connected for 10 of the time e g a 6 minute call every hour 6 If the local modem needs extra commands you can add these under Additional Modem Settings Some useful commands are Q1
156. wave consists of a positive step at the start of the next minute of the digitiser s internal clock followed by a negative step after a specified number of minutes After a further delay of the same number of minutes the calibration signal is disconnected The default is two minutes The Period and Frequency are ignored The Broadband Noise calibration signal consists of a constant stream of white noise which lasts for the specified number of minutes The Period and Frequency are ignored 8 4 Mass Control Many G ralp instruments respond to control signals to centre unlock and lock the sensor masses These signals are generated by the digitiser You can tell the digitiser to send a signal using the Centre Now Lock Now and UnLock Now buttons on the Mass Control tab TE GSL DEMO DM FW Control Sole Centering Locking Center Now AY Lock Now D UnLock Mow k bonito progress Vertical NeSouth EAAvest Enable AutoCentering at 50 a X cose 2 If you tick the Monitor progress check box the window will remain open during the process and the mass positions will be displayed in the Vertical N South and E West boxes If you leave Monitor progress clear the window will close while the operation takes place You can still monitor the mass positions by selecting the appropriate streams and opening a WaveView window for them Depending on which Sensor Type you have chosen in the System tab see above not a
157. y 1 sps Save OK Cancel Apply Issue L User guide If you do not see the Use in Filter Design option check that only one stream is selected 3 Leaving the Filter Design window open switch to the Waveview window and view the event of interest fea WaveView f m fx S 1 256 Tt m Th H H E Time cursors Ampl Cursors Ip e rrytttttyrrrrryrrtttyrtrtrrrrytrrrtrttyrey ee 1905 19 06 19 07 19 08 19 09 nar 19 11 4 Holding down the shift key Gime select data from the same stream during an event Choose Use in Filter Design from the drop down menu A dialogue box will open asking you if you want to replace the previous spectrum or add to it i Do you wank to use this selection as well as your previous selection Selecting No will replace the existing selection i Mo Cancel Click ves The spectrum of the event will be overlaid on the background noise spectrum in a lighter shade You can now click in the graph to move the filter s corner frequencies to suit the event August 2015 45 Scream 4 5 Sa Filter Design W Highpass O 01112827 Hz 4 thOrder 89 66123 Sees a oo T 1 a oH m 0 0001 Hz 0 001 Hz 0 01 Hz 10000 secs 1000 secs 100 secs 10 secs Log EAN Auto Apply sps Save OK Cancel Apply 5 If you want to view the spectrum of a different event follow steps 3 4 choosing Yes when you are asked if you want to overlay the s

MAN-SWA-0001 Issue L - Scream User's Guide

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