User Manual EL-235 Statistical Vibration Logger - Tech
Contents
1. remove the sensor and connect it to the socket on the front of the case If the logger is not purchased with a battery connect a 12V battery to the red and black terminals or to the red and black wires provided inside the logger box Red is positive and black is negative Do not connect a battery the wrong way round as it may damage the EL 235 Connect the serial comms cable provided to the logger 9 pin socket and to your PC COM1 or COM2 You may need an adapter if your PC does not have a 25 pin serial port connector Install the EL 235 software in the same way as you would any other Windows software START RUN a setup Press the red Wake Up button on the logger control panel for at least three seconds Run the EL 235 software by double clicking on the EL 235 icon and press the Link button to start up communication with the logger Operation of the program is fairly self explanatory See the section entitled EL 235 Host Program on page 8 of this manual for details Refer to the section entitled General Specifications on page 6 of this manual for details of the instrument specifications File S Admin User Manuals EL235_rev3 0 doc Page 4 of 17 Issue Date 24 9 99 Introduction The Enviro Log 235 has been specifically designed for medium to long term building vibration monitoring where the preservation of structural integrity and or the comfort of human occupants is of concern The instrument measures peak and r2. UP button is used to wake up the logger when it has gone into the Sleep Mode EL 235 Host Program EL 235 This program runs in Windows for MS DOS based personal computers and provides the operator with a means for setting up the Host logger downloading and displaying data etc Program Communications Cable This cable connects the Logger Unit to the PC It has a 9 pin D connector at the logger end and a 25pin D connector for the computer serial port A 9 pin to 9 pin connector is available on request when you purchase the EL 235 File S Admin User Manuals EL235_rev3 0 doc Page 8 of 17 Issue Date 24 9 99 Modes of Operation At any time the logger will be in one of three modes of operation These three modes are described as follows 1 Logging In this mode vibration samples are acquired stored in bins and statistics are calculated and saved at preset intervals If Capture Vibration Events has also been selected this data is also recorded and stored for each triggered event If the alarm system is installed and enabled an alarm will be triggered if an exceedence occurs The acquired vibration levels may be displayed in real time by the host program This mode will operate until either the battery voltage drops below 10 8V the memory is filled with logged data or the user elects to stop logging 2 Standby In Standby mode the logger measures vibration levels but does not save them and does not calculate stati
3. a typical logging session with the following requirements The unit is to be configured and started in the users office and then delivered on site After the measurement is complete it will be delivered back to the office for downloading data The alternative to this is to take a laptop on site with the logger and configure and start it in situ e 15 minute statistics are required e RMS Detector Characteristics with Human Response Filtering is required e In addition to statistical logging Capture Vibration Events will be enabled with a Maximum Length of 50 seconds and a separation time of 5 seconds The trigger level is to be 3 mm s on all X Y Z and VS axes with AND trigger logic e An alarm system will be enabled to warn of vibration level exceedences The following steps will complete the vibration logging session as per the above requirements 1 2 3 4 5 Connect the Communications cable between the logger and a PC Serial Port Start the EL 235 host program Hold down the Wake Up button on the logger for a few seconds then press the Link button to link the logger Check that the Battery level is good above say 12V If the unit is logging or any previous data has not been downloaded then follow steps 11 13 to stop download and clear the data before commencing It is recommended that the EL 235 be reset select Tools gt Reset before commencing any logging session The logger memory is now clear
4. life it is recommended that the battery is kept fully charged when the logger is not in use and is charged as soon as possible after a logging session has been completed The battery charger should be connected to the terminals provided on the logger control panel IMPORTANT NOTE The battery should not be charged in a sealed environment If a solar panel has been supplied with the EL 235 then the case lid should be left fully open to prevent any build up of potentially dangerous gas inside the box File S Admin User Manuals EL235_rev3 0 doc Page 9 of 17 Statistical Calculation Periods Issue Date 24 9 99 The logger calculates the statistics of the vibration data collected over specified intervals These intervals vary between 1 min and 1 hour however the times when each set of statistics are calculated is fixed as follows Statistical Interval mins Statistical Calculation Times The start of each minute The start of each even minute Every third minute 0 3 6 etc Every fourth minute 0 4 8 etc Every fifth minute 0 5 10 etc Every sixth minute 0 6 12 etc Every tenth minute 0 10 20 etc Every fifteenth minute 0 15 30 etc Every twentieth minute 0 20 40 Every thirtieth minute 0 30 Every hour on the hour If the logger is started at 10 50 with a statistical interval of 30 minutes then the first statistical calculation will comprise only 10 minutes of data and will be time stamped in the results as 11 00 The next and sub
5. L235_rev3 0 doc Page 5 of 17 Issue Date 24 9 99 General Specifications The EL 235 has been designed to comply with the basic requirements of the relevant international standards for vibration level measuring instrumentation General specifications are as follows Tri Axial Piezo Ceramic with Integral Pre Amplifier and Signal Conditioner 1 Hz 500 Hz Filter Types Acceleration 1 5 300Hz Human Response ISO 2631 DAD 1 clause 3 4 Velocity 1 5 300Hz Measurement Ranges Acceleration 0 0 51m s s Human Exposure Curves 1 128 Velocity 0 64mm s Primary A D Range 10 bit 60dB Linear Sampling Rate 5 samples second channel Sensor Noise Floor Acceleration lt 2 0 mm s rms Human Exposure lt 1 0 mm s s Velocity lt 0 1mm s 4096 Statistical Intervals events Event Modes Event Time Date Max Levels Delays to Max Levels Event Energies mean levels and Total Event Duration Statistical Mode Interval Time Date Leq Lmax L0 1 L1 0 L10 and L90 Temperature Battery Level 10 C to 50 C Alarm Auxiliary Output Signals Contact ARL for more details of this optional feature Communications Protocol EIA RS 232 C 1200 19200 Baud 8 Data Bits 2 Stop Bits Hardware Flow Control Female DB9 Connector Power Requirements 72mA 12V ARL reserves the right to alter specifications without notice File S Admin User Manuals EL235_rev3 0 doc Page 6 of 17 Issue Date 24 9 99 Logger Hardwar
6. Logger battery voltage Selected Filter Type ie Acceleration Velocity or Human Response Selected Detector Type ie Peak or rms Selected Comms Port ie COM 1 or COM 2 Selected baud rate 19200 fixed Communication with the EL 235 logger is initialised using the Link button and terminated with the UnLink button The communications default setup may be modified by choosing Setup Communications in the Parameters Menu before linking to the EL 235 The communication cable should be connected between the EL 235 and the COM1 or COM2 port on the PC If your PC has a 9 pin serial port you will need a 9 pin female to 25 pin male adapter This is available from most computer suppliers Press the Wake Up button for at least two seconds and press Link to connect to the logger The program will now read and display the current status of the logger The status includes the following elements as displayed in the window 1 Real Time Display of X Y Z and Vector Sum values 2 Logger status serial number date 8 time available memory and buffers temperature battery voltage filter and detector type and PC communications settings The logger is now ready to respond to operator commands Depending upon the current status of the logger the function menu will display the available options File S Admin User Manuals EL235_rev3 0 doc Page 11 of 17 Menu Options File Menu Open Exit Issue Date 24 9 99 This menu item open
7. NSW Australia 2120 P O Box 443 Pennant Hills NSW 1715 Telephone 612 9484 0800 Facsimile 612 9484 0884 email el235 acousticresearch com au http www hutch com au acoustic File S Admin User Manuals EL235_rev3 0 doc Page 16 of 17 Index A Alarm Lengths innuna 12 Alarm Unit Descriptor Es 7 B Battery Recharging aa e a a dae aE 9 C Cast ir EAE ae 5 7 Communications Cable oooooonocccononoccconancccnonnncnonnnnnon 8 Communications Protocol cooonooo ooo om 6 Computer Requirement cesceeseeeseeseeeteeeeees 11 Control Panels lactato 8 Copyright InformatiON ooooonoccnncnnocinonconnnonnnanonanonnnnns 3 E EL 235 Description 5 EL 235 Host SoftWat8 oooocccnonccccononccccnonnccnonnanonns 8 11 Installation tito 11 Operational 11 F File Menu cion 12 Eds 12 A OO 12 Filter Types oooooccococcocoonconconconorononoonnoononcnonoonornnonooos 6 H Help Menu About As Lo re 13 Help Conte nt cccccccscssecssecsesesseesseseseneees 13 Search for help ON 0 0 eee eesseescesscesecesecsseenees 13 I Introduction cccccccecssccessceessecensceesseceseeeeseeceseeeneeees 5 L LOGGING MOE eee eceesseteereeteenseesenseeeeeseeseeseens 9 M Measurement Menu o oooccccnoconocccononnnonnnonnninanonncn 12 Download Data ooonoocccnnnocccononccccnnanccconananoninnanonn 12 E 12 Measurement RangeS ooocooccconiccconicncononnconocnnanoso 6 Memory Capac
8. User Manual EL 235 Statistical Vibration Logger Acoustic Research Laboratories Issue Date 24 9 99 Table of Contents AA NN 3 WARRANTY GAIA sede sounveesvecsecsdecensevesebvasye 3 QUICK START INSTRUCTIONS ccoioccoscococinnconnioniiovi cade sede stessassadsedessasessess onde ocdasteseeseassedseesvedseas cade code sbosenstessesoussbessoas 4 INTRODUCTION AA E A T E A E sedusedasdves estra iiO 5 GENERAL SPECIFICATIONS wise sessccsisscscesescdeocsssacecesesvctacsasesesete soctocsecoowascaSeesesoaboute secvosvoccausees posvostonsoseepasseseseosse cacsoese 6 LOGGER HARDWARE isssecccsssscscosscnncceseccdssassccvevsescsvesscovevennecedesovscessenusccsvecasessevaneseuuesdesnsusooeseencessecdoeseedesdesvessouseevesse 7 TEOGGER CASE foc sede osetia es ca Ses pe Seca Be n aiii 7 SENSOR 5 criss cae ca Se AO 7 ALARM UNT adidas 7 LOGGER CONTROL PANEL ccssssccccccecsessstcecececsessnaececccecsenssececececseseuseseeececsesesaaececccecsessaaecececscsessaaeeesececeeneaeeeeeeceeeene 8 EE 233HOSTPROGRAME id A sides cedet soa sue A E east 8 COMMUNICATIONS CABEB ecuador dd 8 MODES OF OPERATION vivcssscsesccssseensosnscensssoncivevvenasdsncvecsvencvessvescvesevenessecassvseuesceuscasosseuaaecsenscdsesuecedeseenssducvvesenseenesse 9 RECHARGING THE BATTERY aii A dt SE aks MEATS eee NR EB a EEE 9 STATISTICAL CALCULATION PERIODS siscesci cdi seeteecuestessteobaave cbcss a a 10 THE EL 235 HOST PROGRAM aiissscsccsssccedssssecessetaccsasctncssansssdsecvacesse
9. buostenctesevesesoestoussvosseuebvsctscedusoseeessesuccadeectacossedaes 11 INSTALLATION 1c 023 E NEE E PE EEE E SOE idas 11 HOST OPERA MON anene a a O ere 11 MENU OPTIONS aoh ann ro I AEn AR E EN AR A B00 LUN E AR asiendo 12 A SAMPLE LOGGING SESSION siicsissscescass cccsosceccswecdescesensoscetestecessonseseaseocesoeseasalcoctecncbenceseases te eSEE Eonar etrs seso a teser 14 PRODUCT SUPPORT aiscssiscccesessensevsessecesucenssdusvecs vebuscdascvsossevecuessduces tases AAA a i ia iii iia 16 NA A 17 File S Admin User Manuals EL235_rev3 0 doc Page 2 of 17 Issue Date 24 9 99 COPYRIGHT This manual software and the design data which it describes are copyright with all rights reserved None of the data may be copied without the express written consent of ACOUSTIC RESEARCH LABORATORIES PTY LTD ARL WARRANTY LIMITATION Each EL 235 Environmental Vibration Logger is supplied with sensor communications cable software carrying strap and user manual It carries a 180 day or six months parts and labour warranty against manufacturing defects If during the warranty period a unit fails to perform in accordance with the published specifications it will be repaired or replaced free of charge This warranty is void if the equipment has been dismantled altered abused in any way or if the operator has not followed user instructions Authority to return the unit s must be obtained from ARL prior to shipment Carriage costs to ARL will be paid by th
10. e Logger Case A rugged weatherproof carry case houses the logger unit Signal conditioning hardware the microprocessor controller and the power distribution circuits are contained within a compartment on one side of the chassis A compartment is provided in the middle for a battery and space is available beside the battery for a small DAT recorder ancillary devices accessories etc A weatherproof connection for the sensor is provided on front of the unit Connectors for the host PC battery charger and auxiliary equipment optional feature are provided along the front of the chassis A Wake Up button is also provided on the connector panel Front View when Closed Sensor The sensor comprises three piezoelectric accelerometers tri axially aluminum case with Figure 2 EL 235 Tri axial associated pre amplifier Sens r circuitry The sensor attaches to the logger via a cable and an IP 67 rated Figure 1 EL 235 Case water tight connector The disconnected sensor may fit inside the logger case for easy transportation These units should never be positioned in direct sunlight or exposed to extreme temperature variations As these sensors are accelerometers they must be treated with the utmost care The sensor case is not waterproof Top View when Open Alarm Unit Figure 3 below shows the optional alarm unit may be provided with the EL 235 This alarm unit is configured by the host software see EL 235 Host Program on pag
11. e 8 and connected to the side of the external case The alarm acts as a switch and is designed to operate an audible or visual or both alarm mechanism The actual alarm mechanism may be powered by the EL 235 s battery an auxiliary battery or mains power Figure 4 below shows the preferred method of connecting the alarm mechanism to the EL 235 The alarm mechanism in this case a blue strobe light is powered by an auxiliary battery This battery could be replaced with a mains powered 12V DC power supply if mains power is available The alarm switch is Figure 3 EL 235 Alarm Unit Alarm Light 235AFL B01 Alarm Switch PA 2354 01 E TE EL 235 Figure 4 EL 235 Alarm Connection File S Admin User Manuals EL235_rev3 0 doc Page 7 of 17 Issue Date 24 9 99 controlled by the EL 235 and switches power on and off to the alarm light This method of connection is the most flexible since any power supply can be used so long as it is appropriate for the alarm mechanism used lt does not drain power from the EL 235 either which leads to extended logging time Logger Control Panel The control panel on the front of the logger provides connection sockets required to operate the instrument The provided comms WAKE UP Switch Comms Connector Battery Charging Terminals cable may be connected between the logger Figure 5 EL 235 Control Panel Comms Connector and a spare serial port Comm 1 or Comm 2 on a PC The WAKE
12. e Stop Logging button The logging session has now been completed and all data is stored in a memory buffer of the logger Select Download Data from the Measurement menu The status of all four memory buffers will be shown in a window The completed logging session details will be shown in the most recently used buffer To download the last logging session data select Download data from the latest buffer Enter a filename for the statistical data eg SAMP1 CSV 8 Characters Max CSV extension and then for the events data eg SAMP2 CSV The statistics data will now be downloaded to SAMP1 CSV and events data to File S Admin User Manuals EL235_rev3 0 doc Page 14 of 17 Issue Date 24 9 99 SAMP2 CSV in the directory selected 13 Press the Clear Last Buffer button to delete the data from the logger and Cancel to return to the main window 14 After a measurement like this the EL 235 battery should be placed on charge ready for a subsequent logging session Do not store the EL 235 with the tri axial sensor connected If your EL 235 is fitted with a fail safe connector this will drain power from the battery and may cause permanent damage to the battery File S Admin User Manuals EL235_rev3 0 doc Page 15 of 17 Issue Date 24 9 99 Product Support Within New South Wales Australia this product is supported directly by Acoustic Research Laboratories Pty Ltd Level 7 Building 2 423 Pennant Hills Road Pennant Hills
13. e buyer and those for return will be paid by ARL The above warranty does not include any implied warranty of functionality for a particular purpose ARL assumes no responsibility for damages of any description resulting from the operation or use of its products Since it is impossible to anticipate all of the conditions under which its products will be used either by themselves or in conjunction with other products ARL cannot accept responsibility for the results unless it has entered into a contract for services which clearly define such an extension of responsibility and liability ARL retains the right to change any specifications without notice as legislative engineering or manufacturing conditions may warrant WARNING This is a delicate electro vibration measuring instrument Although it has been designed for field use it contains sensitive electronic components which cannot reasonably be expected to withstand high levels of stress and shock Evidence of negligence in the care and handling of the instrument may void the manufacturer s warranty File S Admin User Manuals EL235_rev3 0 doc Page 3 of 17 Issue Date 24 9 99 Quick Start Instructions If you are reasonably familiar with vibration measurement techniques logging instruments and the Windows environment then this page gives all the information you need to get started We recommend that the entire manual be read prior to using the equipment Open the logger case
14. ed and in Standby mode If required select Parameters from the menu and then Filtering Detection from the sub menu Select RMS detection and Human Response filtering from the current window Select Logging from the Measurement Menu and configure the logging session as follows Enter a Measurement Title Select a Stats Interval of 15 Minutes Click on the Capture Vibration Events option so that a cross x is displayed Set the Maximum Length of 50 seconds Set the Separation Time of 5 seconds Select a Trigger Level of 3 mm s Select all four axis to Trigger On ie X Y Z and VS Set the Trigger Logic to AND Once all the settings are checked and correct begin a logging session by pressing the Start Logging button The unit begins logging Unlink the logger to stop communication with the PC The communications cable may then be disconnected Disconnect and place the tri axial sensor inside the logger case before transporting the logger to the desired measurement location Upon placing the logger in the required position the sensor should be connected and securely mounted The unit is then left for the required logging period Upon recovering the logger the sensor may be disconnected for ease of transportation Re connect the communications cable run the host program and link to the logger The status will be shown as logging and the measurement details will be displayed on the monitor Select Logging from the Measurement menu and press th
15. his point an event timer begins after the preset threshold is met The Maximum Values and time Delay to Maximum s are shown for X Y Z and Vector Sum Axes Once the threshold has passed a Sep separation Counter counts down to zero at which File S Admin User Manuals EL235_rev3 0 doc Page 12 of 17 Issue Date 24 9 99 time the event is deemed to have finished Parameters Menu Setup Communications Filtering Detection Set Logger Clock Display Options Tools Menu Calibration Firmware Version Reset Link Unlink Help Menu Help Contents Search for help on About EL 235 This menu item is available only when the logger is Unlinked It opens a window which allows the PC communications settings to be altered between COM 1 or COM 2 with baud rate settings between 1200 and 19200 Currently fixed to 19200 This menu item opens a window which allows the choice of detector characteristics ie Peak or RMS and the choice of filter characteristics ie acceleration human response or velocity This option allows the user to adjust the clock time of the logger itself The time can be manually adjusted or set directly from the time on the PC being used This option allows adjustment of the update rate of the real time display The update rate can be as high as 10 samples per second The update rate is simply the rate at which data is requested from the logger for display on the PC It does not affec
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17. ms particle velocity peak and rms acceleration and human exposure weighted acceleration Logged results are presented in the form of percentile statistics of vibration in selected contiguous intervals from one minute to one hour In addition the unit may also be configured to log vibration events which exceed a user pre set threshold The logger is housed in a tough weatherproof case with an integral waterproof connector fitted on the front for attachment of the sensor Space is provided inside the case to fit a 12V 24Ah sealed lead acid battery which provides continuous operation for around two weeks Other 12V batteries may be used with the corresponding operational life variations For very long term installations the unit may be configured with a telephone modem and or solar panel A telephone connection may be used to control the logger remotely check battery voltage download data reset the unit and re commence logging Normal control and configuration of the logger is accomplished via the EL 235 Host Program which runs under the MS Windows Environment on MS DOS based personal computers The host computer is connected to the logger communications port via a 9 pin D connector on the logger The interface protocol complies with the ElA RS 232C serial communications standard A range of optional software utilities accessories and spare parts are available for the EL 235 from your local representative or from ARL File S Admin User Manuals E
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19. s duration for the event to be considered complete Alarm Length The length of time for the alarm to be ON after an exceedence is detected This menu selection opens another window which indicates the status of the logger memory There are four available memory buffers which can represent up to four separate logging sessions As there is no set memory allocation per buffer the possibility exists whereby one buffer can utilise the total logger memory allowing no data storage capacity for remaining buffers Data can be cleared or downloaded to the PC by selecting the appropriate buffer The downloaded data is stored as a comma separated value CSV file which may be imported into most commercial spreadsheets A Download All Data option is available which performs a complete memory retrieval to the PC This may be useful in the event of logger memory corruption or when a logger has been inadvertently reset A reset does not clear the memory but simply sets the relevant pointers to indicate that all buffers are empty when in fact the data is still present A dump all ignores buffer pointers and dumps all data This selection will permit a fast time capture operation to be carried out on any channel to determine structural frequencies This option is available when the logger is in Standby Mode This menu item opens a window which tracks the status of a vibration event An event is indicated when the Event In Progress box is checked At t
20. s a previously stored data file The data is organised in a grid fashion similar to a spreadsheet showing all measurement details This function is only available when the unlinked from the logger This option terminates program execution and returns control to the Windows environment Measurement Menu Logging Download Data Time Capture Track Events This menu item opens a window with a range of options to begin or complete a logging session by selecting appropriate buttons options A measurement title may be chosen optional and the statistics interval must be selected An option is provided to also capture exceeded vibration events and trigger an alarm if connected If Capture Vibration Events and or Enable Alarm is selected further option selection is required Trigger Level This is the vibration level which is to be exceeded for an event to occur Trigger On A selection of X Y Z and Vector Sum Axes may be made for which the trigger level is to occur Trigger Logic If the trigger level is to be exceeded for all selected Axes to constitute an event choose the AND option Else if only one axes needs to be exceeded to trigger an event choose the OR option Max Length This is the maximum time an event may occur 1 to 99 sec If the vibration level still exceeds the trigger level after this time the event is deemed to be finished Separation Time The vibration level must fall below the trigger level for thi
21. sequent intervals will contain the full 30 minutes of data and will be time stamped as 11 30 12 00 etc File S Admin User Manuals EL235_rev3 0 doc Page 10 of 17 Issue Date 24 9 99 The EL 235 Host Program The EL235 program requires the following computer resources 1 Windows 95 or Windows 98 2 1x serial port and 3 VGA graphics display 800 x 600 resolution or better recommended Installation The host control program is supplied on floppy disks You should install the program by running setup exe on the provided floppy through Windows Program Manager or Windows 9x Start Menu and following the simple install procedure The program can then be run by selecting it in the Windows 9x Start menu Host Operation Run the host program The computer will display the standard operating window for the EL 235 logger It comprises the following elements Menu Bar Menu items are File Measurement Parameters Tools and Help Link button to initialise communication between the logger and the Host PC Graphical Vibration Level readout for X Axis Y Axis Z Axis and Vector Sum Status readout to show if the logger is operating in Standby or Logging modes If the logger is logging it will indicate which buffer is being used and the time and date that the logging session started The EL 235 serial number e EL 235 time and date Available memory and what buffers are available Logger internal temperature
22. stics The measured levels may be displayed by the host program This mode of operation is analogous to a conventional vibration meter If no communication is in progress with a host PC for approximately two minutes the logger shuts down and goes into Sleep mode 3 Sleep When the logger is asleep the microprocessor and vibration level measuring circuitry is switched off so that battery power is conserved Any data which is stored on the logger will be retained by battery backed memory A WAKE UP button is provided to interrupt the sleep state and place the logger in the standby mode Normally a stored logger which is not logging will be in the sleep mode When the communications cable is connected and the WAKE UP button is pressed the logger wakes and enters the standby mode The host program may then communicate Link with the logger If no communication with the logger occurs whilst in the standby mode the logger shuts down in approximately two minutes and goes into the sleep mode Logging mode is entered via the Logging menu in the host program Once the logging mode has been started the system cannot enter the sleep mode until the standby mode is selected by the user when the logging session is stopped There are however two exceptions to this rule being when the memory capacity has been reached or when the battery voltage has dropped to less than approximately 10 8 Recharging the Battery In order to maintain maximum operating
23. t operation of the logger This option allows the operator to create a set of default options which the EL 235 will be set to when a reset is performed This menu item opens a window which permits adjustment of the sensor calibration offsets in incremental steps This is normally only used where a sensor has a known calibration error and it is to be compensated by the logger Whilst the calibration window is displayed the display bars on the main screen are disabled and the numeric readouts for each channel are averaged and updated twice per second This permits easier calibration This option displays the version of firmware currently installed in your EL 235 and the copyright date The firmware is the software which is installed in the microprocessor card s EPROM This software is updated periodically such as when new features are added This allows the user to reset the logger to default status and marks all memory as clear for use This menu item performs the same function as the Link Unlink button in the main window This option opens the help file at the main help contents page equivalent to pressing the F1 key This opens the help index where you can search for specific help topics and keywords This option gives some basic information about the EL235 Vibration Logger Program File S Admin User Manuals EL235_rev3 0 doc Page 13 of 17 Issue Date 24 9 99 A Sample Logging Session This section of the manual describes
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