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Accudata GVM-3 Ground Vibration Meter

Page Nº 75

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Summary of Contents for GVM-3

Page 1: ...Accudata GVM 3 Ground Vibration Meter 2018 May Rev 3 Accudata Ltd Aspect House 48 The Spinney Ripley Derbyshire DE5 3HW Made in EU RoHS compliant ...

Page 2: ...ommunications 24 2 4 Show records panel 31 2 5 Mail panel 33 2 6 Data transfer panel 35 2 7 Status and information panel 36 2 8 Power save dialog 38 2 9 Beacon options dialog 39 3 Communications module 40 3 1 LAN or Wi Fi connection configuration 40 3 2 Access the WEB server 40 3 3 Access the FTP server 41 3 4 WEB server 41 3 4 1 Home page Equipment status 43 3 4 2 Help 44 3 4 3 About 44 3 4 4 Sho...

Page 3: ...ysis 64 5 2 FFT 66 5 3 Math functions 66 5 4 Norm 68 6 Configuration options 68 6 1 Main options 69 6 2 Printer options 70 6 3 Font configuration 71 6 4 Colour configuration 72 6 5 Norm configuration 73 7 Regression analysis 74 Chapter 3 Technical specifications 76 TECHNICAL SPECIFICATIONS 77 ...

Page 4: ...tion to refund of the purchase price free of charge repair or replacement of a defective product which is returned to an authorized service centre within the warranty period To obtain warranty service contact the seller of the product with a description of the problem postage and insurance prepaid Accudata Ltd assumes no risk for damage in transit Following warranty repair the product will be retu...

Page 5: ... techniques decompile or disassemble the SOFTWARE 2 2 Rental You may not rent lease or lend the SOFTWARE 2 3 Marks This contract does not provide you any rights in relation to trademarks 2 4 Technical Support Services Accudata Ltd may provide technical support services for the SOFTWARE The technical information provided by you to Accudata Ltd as part of support services may be used by it for comme...

Page 6: ...nction of the SOFTWARE is due to accident abuse or misuse Any replacement SOFTWARE will be guaranteed the greater of time remaining until the expiration of the original warranty or thirty 30 days 6 NO OTHER WARRANTIES To the maximum extent permitted by applicable law Accudata Ltd and its suppliers shall not be responsible for any warranty or condition either express or implied including but not li...

Page 7: ...ty Directive 2004 108 EC RoHS Directive 2011 65 EU Standards used EN 61000 6 1 Electromagnetic Compatibility Immunity for residential commercial and light industrial environments EN 61000 6 3 Electromagnetic compatibility Emission standard for residential commercial and light industrial environments The tests have been performed in a typical configuration This Conformity is indicated by the symbol...

Page 8: ...structions of the manual at all times in order to use the seismograph in a safe way The use of the Accudata GVM 3 in a way which is not specified in the manual does not guarantee its protection The protection range of this the Accudata GVM 3 is IP 54 In order to ensure this protection you must follow these procedures Always use the plugs caps If using the Net plug RJ45 serial Plug or USB plug in w...

Page 9: ... drill or open the battery If the battery has leaked acid and contact is made with it wash immediately with water and seek medical advice Charging temperature 0º C to 45 ºC Working temperature 10 ºC to 55 ºC Storage temperature short term 20 ºC to 60 ºC Storage temperature long term 20 ºC to 25 ºC The battery must be recycled or disposed of properly Only use the power supply provided with the equi...

Page 10: ...with one spike Standard option Tri axial block of geophones 1 315 Hz with 3 spikes Air over pressure microphone with support Standard option Other transducers Hydrophones accelerometers etc Printer Router Cable extension Etc Note The integral rechargeable Lithium Ion batteries are provided charged However the batteries should be fully charged before first using the GVM 3 For safety reasons during ...

Page 11: ...Accudata GVM 3 Ground Vibration Meter Page Nº 8 Chapter 1 Use of the Accudata GVM 3 ...

Page 12: ...Accudata GVM 3 Ground Vibration Meter Page Nº 9 ...

Page 13: ...y pushing this key 3 On key Press to switch on the GVM 3 4 Trigger key Use this key to force a trigger while the GVM 3 is recording it will not function when in Bar graph only mode 5 Arrow keys Use these keys to move the cursor through the screen as a mouse Use the arrows for precision movements 6 Click key Used as a left mouse click 7 Power LED Lights up when connected to an external power supply...

Page 14: ...or external devices e g a router A special plug is required 2 Channels 1 3 Connection for Tri axial Block 1 or channels 1 2 and 3 3 Channels 4 6 Connection for Tri axial Block 2 or channels 4 5 and 6 Only on 7 channel equipment 4 Channel 4 4 channel version or Channel 7 7 channel version This channel is used in the standard version for the low frequency air over pressure microphone The LAN RJ 45 c...

Page 15: ...ave been purchased The back of the GVM 3 has the connectors shown below The numbers show 1 USB Host connector Used with an external USB memory stick to transfer the data or the WiFi adapter Do not use this connector with a computer 2 USB Client connector Used for a direct link to a computer The GVM 3 will be identified as an external drive For this operation use the USB cable provided 3 SD Card co...

Page 16: ... To use a box that requires alphanumeric characters the following dialog screen will appear The keys are Deletes all the characters in the string Deletes only one character in the string Changes from lowercase to uppercase or to special characters Accepts the string and exit ...

Page 17: ... 3 Ground Vibration Meter Page Nº 14 1 2 Numeric keyboard When a value needs to be numerical the following dialog box will appear The C key is used to delete a number and Enter is used to accept the value and exit ...

Page 18: ...seconds to initialise Note The GVM 3 periodically performs a disk check that may take between 1 2 minutes The disk check operation is not a regular event but the extended start up time does not indicate an equipment malfunction After switching on the the screen below is shown Please note the warning and check the options on the tool bar explained later ...

Page 19: ...ecord panel 4 Option tabs 2 1 1 Tool bar 1 2 3 4 5 6 7 8 9 1 Switch off button Switches off the GVM 3 2 Date Time date 3 Power save Enables or disables the power saving mode See the power saving option for more information 4 Logger to file Enables or disables the logger to file When the logger is in use one text file will 1 ...

Page 20: ...nformation as the logger file to an external printer 6 Logger to mail To use this logger the communications module must be installed This logger sends e mails to your e mail address with the status of the GVM 3 and or the records captured See the communications section for more information 7 Logger to Beacon Use this logger with a Beacon external device See the Beacon section for more information ...

Page 21: ...t a trigger has occurred but not concluded If there is a recording in progress while this circle is shown the recording will be stopped and the information of this trigger will not be stored on the disk Only for waveform mode 2 1 2 Configuration information This part of the screen shows the actual configuration of the GVM 3 including Channel Type of transducer Trigger level If the trigger of this ...

Page 22: ...Accudata GVM 3 Ground Vibration Meter Page Nº 19 2 1 3 Record panel Use this window to select the record time and record mode then press the Start button To stop the recording press the Stop button ...

Page 23: ...the trigger level is exceeded At midnight the bar graph file automatically changes to a new one The record time is used in the following way according to the type of record Waveform mode In this case the time in seconds is the total recording time of the file including the pre trigger time with a sampling period of 2048 samples per second If the vibration continues another record will be captured ...

Page 24: ...f this panel is explained in section 2 4 Mail panel The use of this panel is explained in section 2 5 Data transfer panel The use of this panel is explained in section 2 6 Status and information panel The use of this panel is explained in section 2 7 Where is 2 1 Recording Panel ...

Page 25: ...Ground Vibration Meter Page Nº 22 2 2 Record configuration panel This panel enables configuration of the recording parameters The configuration options are on the left and the configuration information is on the right ...

Page 26: ...igger value 4 Trigger used This check box enables the selected channel s to be the trigger 5 Note 1 2 The notes will appear in the report useful to identify the GVM 3 job location etc 6 Pre trigger time Time recorded before the trigger level is reached Only used in waveform mode 7 Frequency calculation method Use this drop box for the frequency calculation method with the following options Zero cr...

Page 27: ... graph mode only the zero crossing method is possible The information panel provides the following information The selected transducer configuration is shown in the top table The lower table shows comparative values for Pascals and Decibels Use this table as a reference for the air over pressure channel if the trigger level is to be set in decibels ...

Page 28: ...ee 2 4 section 3 Language selection 4 Date format 5 Channels configuration See 2 3 1 section 6 Communications See 2 3 2 section 7 Touch screen calibration Use this option if the touch screen is out of synchronisation Follow the instructions that appear on the screen 8 Restore default values Use this option if to restore the GVM 3s configuration to the factory defaults 2 3 1 Channel configuration U...

Page 29: ...he dialog 2 3 2 Communications This option is only available if the communication module is installed When this option is selected one window with a virtual keyboard and another with the communication options appear For this configuration it is highly recommended that the keys are used instead of the touch panel to move and click on the options Tip Plug a mouse into the USB port for a more conveni...

Page 30: ... network devices 4 Refresh Press this button to find Wi Fi spots 5 Connection status 6 Check this box to use the wired network LAN as default network 7 Select among the different available connections 8 Add a new connection 9 Delete an existing connection 10 Disconnect the current cable connection 11 Properties of the connection 1 2 3 4 5 6 7 8 9 10 11 ...

Page 31: ...ection Press the Add button 8 Type in the profile name The new connection has been created Select the Properties button 11 Whenever possible use a static IP address otherwise it will not be possible to access the WEB and FTP server when the IP address changes In the example a static IP at address 192 168 1 45 has been used For the IP address it may be necessary to check with the Company s IT depar...

Page 32: ... GVM 3 Ground Vibration Meter Page Nº 29 If the GVM 3 was purchased with a router the IP address will have been configured in the factory After selecting OK check the status of the connection on the tool bar 5 ...

Page 33: ...i Fi connection Ensure that the Wi Fi adapter is plugged into the Host USB port before switching on the GVM 3 Press the Add button 8 Type in the profile name The new connection has been created Select the Properties button of the Wi Fi spot to connect ...

Page 34: ...Accudata GVM 3 Ground Vibration Meter Page Nº 31 In this case the Connect button under the Accudata Wi Fi spot Amend Vibraquipo in image ...

Page 35: ...ecommended that a static IP address is used but in this case as an example the IP address is assigned by the Wi Fi spot Enter the type of encryption and password for the Wi Fi Press the connect button and check the status of the connection on the tool bar 5 ...

Page 36: ...Wi Fi spot is shown 192 168 1 105 In this case it is possible that the Wi Fi spot will change the IP address and it will not be able to access the WEB and FTP server It is always recommend that a static IP address is used as in the wired connection example 2 4 Show records panel ...

Page 37: ... date time of the record 2 Previous Next Navigates to the previous or next record 3 First Last Direct access to the first or last record stored 4 Show Text Show the text data values shown in the above picture 5 Show graphic Shows the graph of the record 6 Show FFT Use this button to show the FFT analysis of the record Only in waveform mode ...

Page 38: ...Accudata GVM 3 Ground Vibration Meter Page Nº 35 7 Norm Shows the Norm selected in the GVM 3 configuration panel Delete one record Deletes the record shown on the screen ...

Page 39: ...face see the WEB server section Where 1 Test Button Tests the configuration of the mail server An e mail will be sent 2 Send mail to Enter the mail address where e mails are to be sent 3 Server The name of the server Please contact your e mail provider if it is necessary to change the mail server and the following data 4 Sender Sender name of the mail server 5 User User name to login into the mail...

Page 40: ...wn mail server your company server for example but we can not provide any technical support for this change The net administrator may advise you to change and configure this data Suppose that you want to use your gmail email account and your address is mymail gmail com and your password to access your account is mypassword you must configure the mail server as follows Server smtp gmail com Sender ...

Page 41: ...arning All the data in the device will be deleted 4 USB Gadget button Connects the GVM 3 and the computer with the provided USB cable 5 Once clicked the following devices will be available on your computer External Disk Drive The device manager of your computer will notify that you have a new disk drive present Use it in the same way as a USB disk Only reading operations are permitted on this devi...

Page 42: ...mber of loggers stored 7 Free memory 8 If the power supply is plugged in a voltage level will be displayed in this field This option is very useful if the Accudata GVM 3 is powered with an external battery 9 Accudata GVM 3 working temperature this value is different from the environmental temperature Optimum value of this field is between 15 ºC to 65 ºC 10 Net status parameters Equipment IP Public...

Page 43: ...riod selected in the point 2 4 Energy options for the external devices This option requires a special plug With this option the on off period time for the external devices like a router can be selected This option is intended for battery powered equipment when a low consumption is needed 5 Same as equipment button Click on this button to select the same working time for the equipment and the exter...

Page 44: ...udata GVM 3 Ground Vibration Meter Page Nº 41 2 9 Beacon options dialog Click the Beacon icon of the tool bar to show the following dialog Introduce the desired red and yellow levels for the Beacon device ...

Page 45: ...ssibilities of obtaining the new one You can wait for a status mail or alarm mail You can get the IP address from the message Please look in the Internet for excellent tutorials about how to do this If you use the router provided by us you can send a SMS at any moment and you will receive a message with the public IP of your equipment instantly Please see the documentation provided with the router...

Page 46: ...e see paragraph 2 3 2 as an example where the address will be ftp 192 168 1 45 3 From the Internet In this case enter ftp IP port For example if the Internet provider gives the public IP 1 2 3 4 and the ftp port of the router is 2200 enter ftp 1 2 3 4 2200 in the address bar to access the FTP server If using the preconfigured router provided by Accudata Ltd refer to specific documentation about ho...

Page 47: ...s are changed in the security page Once the passwords have been changed and if they are forgotten the only way to recover them is by restoring the factory defaults If the user and password are correct access will be gained to this page New image required This is the Home page with useful information about the status of the GVM 3 The menu options are on the left side and the navigation options are ...

Page 48: ... and loggers stored in the GVM 3 4 Memory free 5 Shows the battery power supply status If the GVM 3 is working with the internal battery the charge level will be shown If the GVM 3 is connected to an external power supply the voltage of this power supply is displayed This option is very useful an external battery is used as the power supply In this case with this voltage level you the charge level...

Page 49: ... cold Note that these temperatures are different from the environmental temperature Please contact the factory if you need assistance working under extreme environmental conditions 7 Date Time of the GVM 3 clock 8 Time zone of the GVM 3 clock 9 Date of calibration 3 4 2 Help This option gives assistance with the interface 3 4 3 About Information about the software version and the manufacturing com...

Page 50: ...se the GVM 3 interface and the WEB interface to change configuration parameters at the same time as the consequences could be unpredictable 3 4 5 Change configuration Use this page to change the recording time notes trigger levels and power save options of the GVM 3 ...

Page 51: ...Accudata GVM 3 Ground Vibration Meter Page Nº 48 ...

Page 52: ...ired it is possible to plug the router into the GVM 3 so that it will disconnect when the GVM 3 is off 3 4 6 Alarm configuration Use this screen to configure the alarms and mail addresses The first part of the screen is intended to introduce the mail addresses and the status information periodically change email address in Mail 1 Up to 3 different addresses can be selected on the GVM 3 to send tri...

Page 53: ...d always begins at midnight For example if the GVM 3 status shows every 8 hours the mails will be sent at 00 00 08 00 and 16 00 Select the addresses which will receive the status mail with the check boxes The second part of the page allows the definition of the alarm options ...

Page 54: ... from high to low Please note that the alarm levels are different from the trigger levels although the same levels can be selected for both For example if 1 00 mm s is selected as the trigger level and 5 00 mm s as the alarm level with a vibration value of 3 mm s a record will be stored in the memory but no email will be received ...

Page 55: ...s exceeded will be sent Note that with this option the alarms are not sent in real time they are sent at the end of the period It is also not possible to send mails with attachments with this option There are 2 possibilities of attachments to the alarm mails Binary file the sis file is attached With the computer software open this file to analyze the data and print the desired reports pdf file A p...

Page 56: ... information about the vibration values in real time It is the same information as shown in the instrument whilst recording with the instant and maximum values of the recording period If the GVM 3 is recording 24 hours a day the recording period will be restarted automatically at midnight ...

Page 57: ... show the data stored in the GVM 3 New image needed All the records are displayed or filter by date useful if there are a large number of records Click on the calendar icon to select a date After selecting the filter option box click on the filter button The record data will be shown ...

Page 58: ...ry record there are 3 icons with the following meaning Indicates that the record is a bar graph file Indicates that the record is a waveform file Downloads a pdf report of the record Downloads the binary file 3 4 9 Download data This screen opens the FTP client of the WEB browser not all browsers have this function Firefox and Chrome browsers are recommended ...

Page 59: ...ion of records There are 3 options 1 Delete records for this date All the records of the selected date will be deleted 2 Delete the records before this date and time All the records before the date and time selected will be deleted 3 Delete all records Warning Be careful with this option The operation can not be undone ...

Page 60: ...unique for each GVM 3 with the format VibraWEB instrument serial number For example an instrument with the serial number VA6244 the master key would be VibraWEBVA6244 case sensitive AccudataWEB Then enter the new password and retype it Finally press the submit password change button Forgotten passwords can be restored in factory defaults within the GVM 3 The default passwords admin guest will be r...

Page 61: ...on The GVM 3 has an auto power on function that allows recording continuously after a long power failure that completely empties the battery By default this option is disabled To enable or disable it you must open the GVM 3 remove the four screws on the bottom lid and locate this jumper Jumper unplugged Auto switch on is off ...

Page 62: ...ic circuits Pay special attention when closing the lid Be sure that there is no cable trapped between the lid and the case 4 2 Remove the fuse for equipment transportation Some transport regulations oblige you to remove the fuse when sending the GVM 3 by courier To remove or connect it again please follow these instructions Remove the four screws on the bottom lid and locate the fuse ...

Page 63: ...fforts to avoid this situation have been made and the GVM 3 incorporates controlling routines to minimize this effect as far as possible Sometimes especially when the memory has a large number of records the response of the GVM 3 becomes slower and some read operations or disk maintenance should not be interpreted as equipment hang If you experience a real hang press the light button for 8 seconds...

Page 64: ...Accudata GVM 3 Ground Vibration Meter Page Nº 61 Chapter 2 Accudata GVM 3 Analysis program ...

Page 65: ...on For the software installation insert the USB disk which is provided into the reading unit In Windows execute the program called VibrationMeter exe and follow the instructions that appear on the screen For Linux installation follow the indications in Install txt file Depending on the type of configuration of the acquired seismograph it is possible that some of the options explained are not avail...

Page 66: ...Accudata GVM 3 Ground Vibration Meter Page Nº 63 3 Main window Once the program is installed and after executing it this frame appears as the main screen ...

Page 67: ... left to navigate and find folders of stored records To the right there is a grid with the most relevant data of the record in selected in the folder Below this grid there are different options for the analysis of the data Please go to the configuration options Section 6 first if using the software for the first time ...

Page 68: ...elect the reports to be printed A unique document will be generated with the selection 5 Export This button exports all the selected records on the grid for analysis of the data with external programs The format used for the export is CSV comma separated values 6 Show all button All the records of the grid will be available in the analysis panel 7 Show selection button Only the selected records in...

Page 69: ... grid There are several types of filters By serial number Useful for users with more than one GVM 3 By note 1 2 By date Select the date from and the date to the pick up calendar is recommended for this operation After selecting the filters to apply click on the filter button 10 to apply them 4 Show loggers panel Use this option to show the logger files This window has the option to print a report ...

Page 70: ...ation window 2 Grid data summary 3 Navigation buttons Enables change between the previous and next record 4 Exit button Exit the analysis panel and return to the main panel 5 Edit notes button Opens the dialog to change the notes of the record 6 Print button Prints the displayed record 7 Change panels tabs Main as shown above Wave analysis FFT Math functions Norm 1 2 3 4 5 6 7 ...

Page 71: ...º 68 5 1 Wave analysis Use this window to analyze the values and timing of the record 1 Waveform window 2 Navigation buttons Moves the wave to the beginning Moves the wave backwards Moves the wave forwards Moves the wave to the end 1 2 3 4 5 6 7 ...

Page 72: ...maximum amplitude value Decreases zoom 5 View channels Use these check boxes to show or hide channels and the original or transformed wave transformed wave is only possible for the Norms that use this type of mathematical analysis 6 Data grid In this grid the amplitude frequencies bar graph mode and transformed values are shown for the position of the cursor 7 Cursor marks In this area the values ...

Page 73: ... FFT algorithm This function is only available for waveform records 1 Record window 2 FFT window 3 Window time Use this drop box to select the window time to perform the FFT analysis 4 Window position Use this slide bar to move through the wave area to perform the FFT 5 Show channel selection Show or hide the channels to perform the analysis 6 Cursor frequency Frequency of the cursor 7 Data grid I...

Page 74: ...lays the original wave blue and the mathematically transformed wave red 2 Frequency filter parameters In this area select the cut off frequency for filters and to select the ones you want to apply 3 Apply filter buttons Apply the low pass band pass and or high pass filters if selected on the check boxes Calculate the derivative of the wave Calculate the integral of the wave Calculate the RMS of th...

Page 75: ...hematical wave 6 Function applied Displays the mathematical function shown in the wave window and data grid 5 4 Norm This window shows the Norm in use The desired Norm must be selected initially in the configuration window Use the print button for a printed report 6 Configuration options This window accessed through the menu Utilities Configuration for the default configuration options of the prog...

Page 76: ...he language 2 Date format Select the preferred date format 3 Text fields Will appear in the header of the reports 4 Open logo To include company logo in the header of the report Note The logo must have a size of 150 x 120 pixels in bmp format Any graphics program can be used to convert a logo to the correct size and format 5 Press OK to confirm selection 1 2 3 3 4 5 ...

Page 77: ...tions 1 Scale This value does not need to change unless the printed report does not fit on the page 2 Offset This does not need to change unless the printed report is not centered 3 Show vector sum Will display or hide the vector sum in the printed reports 1 2 2 3 ...

Page 78: ...alog The selected font will be used on the screen and in reports If the selected font exceeds the assigned limits or is too small change the following values 2 Screen font scale Increase or decrease the font size on the screen 3 Printer font scale Increase or decrease the font size in the printed reports 1 2 3 ...

Page 79: ...Accudata GVM 3 Ground Vibration Meter Page Nº 76 6 4 Colour configuration Use this dialog to change the different colours used in the reports ...

Page 80: ...e selection is not overridden 3 Frequency range Select the frequency range for the FFT 4 FFX X Axis Specify if a linear or logarithmic X axis is required 5 Show original wave Use this check box to view the original wave in the reports only applied to Norms that mathematically transform the wave 6 Show transformed wave Use this check box to view the transformed wave in the reports only applied to N...

Page 81: ...se a horizontal line at this point to find the charge value The magenta lines limit the area where the study is reliable 3 Component Enables or disables the components for the adjustment and or show the graph 4 Charge distance table data Enter the maximum and minimum distance for the charge distance table and the maximum vibration value allowed 5 Advanced options Enter the confidence level of the ...

Page 82: ...Accudata GVM 3 Ground Vibration Meter Page Nº 79 8 Print button Prints a report ...

Page 83: ...Accudata GVM 3 Ground Vibration Meter Page Nº 80 Chapter 3 Accudata GVM 3 Technical specifications ...

Page 84: ...ings that must be followed by the user to guarantee safe handling and to maintain the instrument in safe conditions The use of the GVM 3 in a different way other than that specified by the manufacturer can impair the protection and or technical specifications of the GVM 3 Calibration The Accudata GVM 3 is provided with a certificate of calibration To ensure that the GVM 3 fulfills the specificatio...

Page 85: ...ports Ethernet USB external disk SD card USB cable Data visualization Display Printer WEB Server FTP Server e mail External power supply 12 V Internal power supply Li ion battery Autonomy See note 2 24 hours Visualization TFT 800x480 pixels 4 Leds Keyboard Touch panel 8 keys membrane Protection IP 54 Dimensions mm 200x145x70 Weight without accessories 1 9 kg Working temperature 15 to 50 ºC Storing...

Page 86: ... channel 2 250 Hz Seismic transducers Geophones fn 8 Hz Transducers response correction IIR filter The theoretical frequency response is in accordance to this expression ATheorical 1 1 0 80 f 0 f 4 1 0 80 f f 1 4 Where f Frequency f0 2 Hz f1 290 Hz Tolerances The maximum tolerances over the frequency response of the equipment are 2 250 Hz Version Frequency 2 Hz 4 Hz 4 128 Hz 128 Hz 256 Hz Upper li...

Page 87: ...ncy range Air over pressure channel 2 250 Hz Seismic transducers Geophones fn 4 5 Hz Transducers response correction IIR Filter The theoretical frequency response is in accordance to this expression ATheorical 1 1 0 80 f 0 f 4 1 0 80 f f 1 4 Where f Frequency f0 1 Hz f1 315 Hz Tolerances The maximum tolerances over the frequency response of the equipment are 1 315 Hz Version Frequency 0 5 1 25 Hz ...

Page 88: ...2 V See the characteristics on the power supply unit Fuse 2 A Internal Li Ion battery 8 4 V Upon request the GVM 3 can be delivered with the following transducers Hydrophones Accelerometers Geophones Etc The specifications of these transducers will be given in their technical data sheet ...

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