USER`S MANUAL LRFB-300 FEEDBACK UPGRADE
Contents
1. 32000 0 000000 When level recorded outputs are typically 100 bits Level offset values are applied to the relative level data before recording Press the SET Control to adjust the offsets and bring the outputs closer to zero The new offsets are then stored in non volatile memory on the Feedback Board FILTER Control This displays and controls the length of the low pass filter applied to the gravity data You can change the filter length with the UP DOWN control Press SAVE button to store this filler setting onto Feedback Board Note At startup this control may NOT display the actual Filter length currently stored in firmware on the Feedback Board Press READ CONFIG Control to update the displayed value 29 Land R Upgrades User s Manual June 1 2009 GPS Lat Lon Control Checkbox If you wish to use GPS data from the Pharos PDA check this box These GPS coordinate data will then be recorded in the PDA output file If you do not wish to use GPS data from the Pharos PDA uncheck this box You can enter LAT LON information from an external source into the two controls labeled Latitude Longitude Enter in Decimal degrees and Press SAVE control These external coordinate data will then be recorded in the PDA output file READ CONFIG Control Press READ CONFIG button to load the various parameters stored in firmware on the Feedback Board into the PDA Config Screen These parameters include the Feedback2. 0 073 0 020 0 000000 0 000000 81 91 48 5 12 6 32 Land R Upgrades User s Manual June 1 2009 Example 3 Earth Tide Monitoring Continuous Reading Interval set to 60 seconds Stat ID Date GMP time Grav TC Grav Tide Lat Long Long Level Cros Level Temp Volta LINEL 0 4 15 2009 21 5 22 0 039 0 B 0 083 30 414493 97 095028 97 162 48 5 11 6 LINEL 0 4 15 2009 21 7 23 0 038 0 E 411625 97 092138 88 167 48 5 12 4 E 411620 97 092185 89 167 48 5 12 1 E 411620 97 092185 38 34 48 5 11 a 411620 97 092185 33 34 485 12 3 411620 97 092185 34 34 48 5 11 E 411620 97 092185 34 30 48 5 11 3 d11620 97 092185 39 32 48 5 11 E 411620 97 092185 39 30 48 5 12 E 411620 97 092185 42 28 48 E 411620 37 092185 7 25 E 411620 97 092185 49 24 48 E 411620 97 092185 52 22 48 EI 411620 97 092185 58 20 48 za 411620 97 092185 58 22 48 E 411620 57 092185 60 22 48 3 d11620 97 092185 62 24 48 5 11 Ej 411620 97 092185 51 28 48 5 12 IINEL 0 4 15 2009 21 8 23 0 036 0 LINEL 0 4 15 2009 21 E LINEL O 4 15 2009 21 E LzNEl 0 4 15 2009 21 0 LINEL 0 4 25 2009 231 E LINEL 0 4 15 2009 21 0 LINEl 0 4 15 2009 21 E LINEL 0 4 15 2009 21 E LINEL 0 4 15 2009 21 0 LINEl 0 4 15 2009 21 E IINEL 0 4 15 2009 21 E LINEL O 4 15 2092 E LzNEl 0 4 15 2009 21 0 LINEL 0 4 25 2009 231 E LINEL 0 4 15 2009 21 0 wei o 4 15 2009
3. 21 E ms or oos EX ECTS CAAD 405 495 528 0 E0 USER TEM 727 TTD 52 020 03 GE SOS Sean Te 33 Land R Upgrades User s Manual June 1 2009 FAQ Frequently Asked Questions Can I re install the MeterLog software in the PDA The File Name is MeterLog exe and is about 1 5mB A backup copy of the MeterLog exe software is supplied on the 1 GB SD card provided with the system This user manual is also on the supplied SD card Can I change the Operating Range of the Feedback system No the range is fixed 34 Land R Upgrades User s Manual June 1 2009 WARRANTY Land R Meter Service LLC repaired and or upgraded gravity meters are warranted for a period of 1 year after delivery At the Purchaser s request L and R Meter Service LLC will make all necessary adjustments repairs and parts replacements All parts will become the property of L and R Meter Service on an exchange basis This warranty will not apply if such adjustments repair or parts replacement are required because of accident neglect misuse operation on improper power transportation or causes other than ordinary use All necessary adjustments repair or parts replacement will be made at no charge to the Purchaser provided that the Purchaser pays all transportation cost to and from the authorized repair facility at L and R Meter Service LLC in Lexington Texas The period of t
4. sure the Bluetooth is turned on In the Lower Right Corner of the PDA start screen is a Bluetooth Icon If it has a red dot with an X the Bluetooth is turned off Tap the Bluetooth Icon to turn it on Ta conect ma deve us Hew O29579 Ret Todos eer desc t comet up Treoin Pore COPD rer Ac COM New Outgoing fot 20 Land R Upgrades User s Manual June 1 2009 PS CONFIG Refer to the PDA manual for details on configuring the GPS system These screens indicate the factory configuration values to use Leave these as set at the factory GPs Settings PS Settings Wei Mabie manages acess aur GPS Spt he hardware port te hich yaur GPS dens a sors wank pages aay dence miracolo etary sa Eda sindaanny e a dede Gr eee rnc een oe sanare pot s Manage GPS auomaticaty recommends E ud a 21 Land R Upgrades User s Manual June 1 2009 DATA TRANSFER by SYNC CABLE Insert CD supplied with Pharos PDA install Windows Mobile i e Microsoft ActiveLink 4 2 software Connect Pharos PDA to Computer USB port with SYNC cable supplied with Pharos PDA Be sure to install and test this function before starting survey DATA TRANSFER by SD CARD The PDA is supplied with a 1 GB SD memory card The SD card flash memory is permanent and will not be lost if the PDA batteries get fully discharged The SD card allows easy data transfer to various devices Many laptops have a direct SD card sl
5. unclamping click OK button next to the Save station label The SAVE screen will pop up The data about to be recorded is displayed for review Hit SAVE to store or EXIT to abort saving the reading 27 L and R Upgrades User s Manual June 1 2009 Config Control Click to enter Config Screen Refer to the CONFIG SCREEN page below for indicators and controls on Config Screen Continuous Recording Control Click to enable continuous recording A new screen will open where you can enter the recording interval Select the desired recording interval in seconds then click GO Control to return to Main Screen EXIT Control Before you turn off the PDA you must exit MeterLog exe using the Exit control in the lower right of the main screen Do NOT close the program with the X in the upper right Should this happen you can re load the program but it may not function correctly Check the Bluetooth Icon on Start Screen to verify it is enabled 28 Land R Upgrades User s Manual June 1 2009 CONFIG SCREEN BACKLIGHT Checkbox Control Config To turn the Meter LCD Display backlight on check this box and press SAVE button Uncheck the box and press SAVE to turn the LCD Backlight OFF LEVELS RESET Control The meter is leveled visually by centering the galvanometer needles The electronic level outputs are 0 000000 sav recorded to the data file in bits ranging
6. Crosa Level Temp Volta Bottom 1 3 3 2009 19 42 22 3 679 3 696 0 017 30 409167 97 093215 111 54 48 6 11 1 Top l 3 3 2009 19 56 31 2 941 2 919 70 025 30 4123 97 08487 50 2101 48 7 11 4 Bottom 2 3 3 2009 20 08 23 3 653 3 685 0 032 0 409157 97 093225 131 95 48 6 11 1 Top 2 3 3 2009 20 24 00 2 982 2 941 0 041 30 41714 97 084828 187 3 48 6 11 4 Bottom 3 3 3 2009 20 37 15 3 633 3 681 0 018 30 409167 197 093223 191 208 48 6 11 4 Top i 3 3 2009 20 51 00 2 91 2 914 0 056 30 417125 97 084883 532 90 48 6 11 3 Bottom 4 3 3 2009 21 02 50 3 631 3 693 0 062 0 409153 97 093215 3 131 48 6 11 Top 3 3 2009 21 15 21 3 01 2 41 0 069 30 41716 97 084923 66 22 48 6 11 3 Example 2 Microgravity Pier to Floor in Lab Stat ID Date GMP time Grav TC Grav Tide Lat Long Long Level Cross Level Temp Volta Pler i 4 15 2009 21 06 59 PM 0 056 0 064 0 008 0 000000 0 000000 24 55 48 5 11 9 Fioor l 4 15 2009 21 11 19 FM 0 049 0 040 0 009 0 000000 0 000000 76 36 48 5 11 8 Pler 2 4 15 2009 21 18 07 M 0 088 0 077 0 009 0 000000 0 000000 145 7 48 5 12 3 Floor 2 4 15 2009 21 22 32 PM 0 041 0 031 0 010 0 00000 0 000000 121 67 48 5 11 6 Pier 3 4 15 2009 21 26 38 PM 0 065 0 075 0 010 0 000000 0 000000 23 48 48 5 11 9 Floor 3 4 15 2009 21 30 38 PM 0 037 0 027 0 010 0 000000 0 000000 0 19 48 5 12 5 pier 4 4 15 2009 21 33 59 PM 0 063
7. Factor and the Filter Length This control will also cause the FEEDBACK FACTOR to be displayed on the second line of the Gravity Meter LCD Display When READ is pressed the second line of the LCD display will change to display a five digit number This number is displayed with a decimal point between the second and third digits i e typically in the range of 12 000 to 29 000 When the PDA CONFIG Screen is EXITed the LCD Display second line reverts to normal Temp Battery Voltage display EXIT Control Press EXIT Control to exit CONFIG SCREEN and return to the Main Screen of MeterLog software 30 L and R Upgrades User s Manual June 1 2009 PDA DATA FORMAT Comma delimited ASCII data file PARAMETER UNITS Stat ID Alphanumeric Date 3 3 2009 GMT time 19 42 22 Grav mGal TC Grav mGal Tide mGal Lat Decimal Degrees Long Decimal Degrees Long Level 32000 bits Cross_Level 32000 bits Temp se Volts Volts 31 COMMENT Station ID GMT Date GMT Time Gravity Tide Corrected Gravity Tide Correction Latitude Longitude Long Level Cross level Meter Temperature Battery Voltage Land R Upgrades User s Manual June 1 2009 GRAVITY MEASUREMENT WITH PD EXAMPLES Example 1 Field Test over 7 mGal Range ABABABAB Repeat Survey Loop Test performed at L and R Meter Service Test Range Lexington Texas Known Diff 6 58 mGal Stat ID Date GMP tise Grav TC Grav Tide Lat Long Long Level
8. Land R Upgrades User s Manual June 1 2009 USER S MANUAL LRFB 300 FEEDBACK UPGRADE and L and R Lithium Ion BATTERY UPGRADE 2009 L and R Meter Service LLC info gravitymeter repair com www gravitymeter repair com Land R Upgrades User s Manual June 1 2009 TABLE OF CONTENTS Land R LITHIUM ION BATTERY UPGRADE Lithium Ion Battery Lithium Ion Battery AC Charger Lithium Ion Battery Enclosure Power Options Gravity Meter Power Supply Vehicle Battery Power Supply Cable NN Oo nk RR Gel Cell Power Supply Cable L and R FB 300 FEEDBACK UPGRADE 8 OVERVIEW 9 SPECIFICATIONS 10 HARDWARE n NULLING DIAL CLAMP ELECTRONIC LEVELS POWER SWITCI LCD DISPLAY DISPLAY of FEEDBACK FACTOR 14 FEEDBACK CARD DATA DISPLAY BOARD GRAVITY METER OPERATION with FEEDBACK 7 PRE SETTING THE COUNTER SURVEY RANGE LESS THAN 300 mGal 7 SURVEY RANGE GREATER THAN 300 mGal 7 READING GRAVITY Land R Upgrades User s Manual June 1 2009 DATA LOGGING to PDA via BLUETOOTH 19 PDA OPERATION BLUETOOTH CONFIG 20 GPS CONFIG 21 DATA TRANSFER by SYNC CABLE 22 DATA TRANSFER by SD CARD 22 PDA SOFTWARE OVERVIEW 28 STARTUP 24 SAVE AS SCREEN 24 MAIN SCREEN 25 MAIN SCREEN Teatro INDICATORS 25 USER CONTROLS 26 CONFIG SCREEN ae PDA DATA FORMAT GRAVITY MEASUREMENT WITH PDA EXAMPLES 32 Example 1 Field Test over 7 mGal Range Exampl
9. Temperature in C Ane ation Latitude Indicator DO Latitude in Decimal Degrees a swe ston o i ute Cross Level Indicatoi pum Relative Level Position in bits gente K 12 52 16 PM Voltage Indicator Battery Voltage in Volts Longitude Indicator Longitude in Decimal Degrees File Path Indicator Default data storage path is NMy Documents Data dat Date Indicatoi GMT Date Time Indicator GMT Time 25 Land R Upgrades User s Manual June 1 2009 USER CONTROLS Tide Corr Checkbox Check this checkbox if you wish Tide Correction to be computed and added to the observed Gravity When enabled MeterLog displays the actual tide value time latitude and longitude indicators Warning The time set on the PDA must be set to GMT or UTM for the tide calculation to be correct You can introduce errors up to 0 6 mGal if the Time Lat or Long is not correct STATION Control The station ID originally defaults to LINE 1 or LINE 2 You can modify the station ID to your choice Highlight the current name and overwrite using the PDA alphanumeric keypad and stylus INDEX Control Modify the index to be stored using the stylus on the INDEX up down control The index will increment by one each time you save a reading 26 Land R Upgrades User s Manual June 1 2009 Save station OK Control When Gravity reading is stable ie typically 2 minutes after leveling and
10. d by the included PDA and MeterLog software PDA Handheld Computer A full featured data logger records the output of the LRFB 300 via Wireless Bluetooth in either field or laboratory conditions The gravity logging software MeterLog allows input of station name latitude longitude for each station The GPS enabled Pharos PDA can automatically input the correct Latitude and Longitude data into the MeterLog software for the automatic tide correction Unfortunately the elevation from a single GPS unit is not good enough for processing elevation corrections You must set the time to GMT UTC time not local time The user can either manually record single data points per station or set the software to record continuously at the selected time interval All data gets recorded to the solid state memory for later transfer to a PC Data can also be recorded onto SD flash cards for even more security and ease of data transfer Land R Upgrades User s Manual June 1 2009 SPECIFICATIONS Principle Linear Electrostatic Feedback Range Approximately 300 mGal 150 mGal Linearity Better than 0 01 Full Scale Data Resolution 0 001 Repeatability 0 01 to 0 02 mGal Electronic Drif lt 0 001 mGal 1000 hr does not include meter drift Feedback Calibration Factor Set at factory in Flash memory Digital Display 2x16 character LCD w backlight LCD heater for below 10 C Output Wireless Bluetooth Port with 2 Hz Serial data outp
11. e 2 Microgravity Pier to Floor in Lab 32 Example 3 Earth Tide Monitoring 33 FAQ Frequently Asked Questions 34 WARRANTY waw 98 REFERENCE 1 APPENDIX 36 Meter Setup wilh Feedback Installed 36 L and R Upgrades User s Manual June 1 2009 Land R LITHIUM ION BATTERY UPGRADE Lithium Ion Battery Two batteries are supplied with each upgrade Lithium Ion Battery AC Charger Model CH4000 Input 100 240 VAC 50 60 Hz Output 24 VDC 2 6A Plug ION BATTERY CHARGER SUPPLY into ION BATTERY CHARGER Install one battery and charge if needed New batteries will be charged when you receive the meter This charger will charge a battery in 4 5 hrs Note Do NOT Plug the ION BATTERY CHARGER into the GRAVITY METER WHITE BOX This 24V COULD DAMAGE the GRAVITY METER ELECTRONICS Land R Upgrades User s Manual June 1 2009 Lithium Ion Battery Enclosure This enclosure on the left side of the White Box interfaces the Lithium Ion battery to the Gravity Meter L and R Upgrades User s Manual June 1 2009 Power Options Gravity Meter Power Supply Use this supply when AC power is available i e in laboratory for tide monitoring or for long term storage on heat INPUT 100 240 VAC 50 60 Hz 1 04 OUTPUT 15V 2 64 40W Max On the Right side of the Gravity Meter White Box is a small pin plug for 12V DC power input to the gravity meter Plug GRAVITY METER POWER SUPPLY into socket
12. ed to maximum gravity anyway Only the long sensitivity axis may have different settings for the Galvanometer and the bubble levels It should be noted that the Screw K Factor table is set up for optical readings and can be off slightly 196 when moving the counter for re ranging purposes while using the feedback system 3
13. ed value for verification This may be helpful in a troubleshooting situation The LCD Display will display the FEEDBACK FACTOR instead of Temp and Battery Voltage when commanded to do so via the PDA The PDA MeterLog software has a control in the lower right corner of the CONFIG screen labeled READ CONFIG When READ is pressed the second line of the LCD display will change to display a five digit number This number is displayed with a decimal point between the second and third digits i e typically in the range of 12 000 to 29 000 When the PDA CONFIG Screen is EXITed the LCD Display second line reverts to normal Temp Battery Voltage display L and R Upgrades User s Manual June 1 2009 FEEDBACK CARD The L and R Feedback Card controls the precision DC Voltage that balances the gravity meter electronically This card also generates the necessary signals to operate the Electronic Level Cross and Long and Electronic Readout CPI systems The Feedback Card is located inside the meter under the black lid It does not contain any user serviceable parts Note the three small blue pots along the card top These adjust the cross and long level gain and the feedback gain These pots should NOT be adjusted by user ie only set at the factory In case of field problems with the feedback system particularly after transportation vibration or rough handling the operator can try carefully re seating the connectors along the t
14. ery Voltage Monitor 9 Install Liquid Electronic Levels 10 Install Nulling Dial clamp 11 Install Feedback Board and Data Display Board 12 Add Electronic Readout CPI if needed additional charge 13 Rework Aluminum Carrying Case to fit Upgraded Meter Land R Upgrades User s Manual June 1 2009 OVERVIEW The L and R Meter Service LRFB 300 feedback system delivers a new level of accuracy precision and reliability A user friendly interface enhances customer convenience No longer is there any need for a K Factor lookup table this system displays gravity directly in mGal on an easy to read LCD display The LRFB 300 feedback system has a range of approximately 300 mGal 150 with a resolution of 0 001 mGal The LRFB 300 is covered by our standard warranty printed at the back of this manual Electronic system The LRFB 300 upgrade is consists of a linear feedback system with a microprocessor controlled 24 bit A D The electronics have extremely high gain and electronic damping which means the meter is more noise resistant A digital low pass filter is applied to average the natural background seismic noise present at most locations Default filter length is 40 seconds and can be set from 1 to 52 seconds in the PDA software The electronic level outputs meter temperature and battery voltages are also acquired All data is transmitted via the Bluetooth serial port on the side of the meter This serial data can be recorde
15. form this procedure twice independently clamp and unclamp the meter after the first set of readings and then perform another set of readings at the same two counter values Then continue on with the survey at the new counter setting as long as possible In a large survey you will end up with a large number of these offsets Keep a careful record of the counter settings as they are not recorded by the data logging system L and R Upgrades User s Manual June 1 2009 Method 2 You can break your survey up into sections that can be measured using one counter setting Then tie those sections together with base stations that are readable with counter settings from two survey sections and still be within the feedback range It should be noted that the Screw K Factor table is set up for optical readings and can be off slightly lt 0 5 when moving the counter for re ranging purposes while using the feedback system level settings If possible you should use the LCD gravity readout to tie sections together it will be more accurate than using the counter Or if there is a large gravity difference 2100 mGal then do a base station tie using the bubble levels if present and optical system only and convert counter readings to gravity with the K Factor table for that meter Reading the meter like an old optical G Meter READING GRAVITY All gravity meters are fragile instruments Data quality repeatability and accuracy is dependent on how ca
16. he CONFIG screen of PDA MeterLog software The first line displays relative gravity in mGal When the meter is clamped the gravity display will typically read 200 00 although this value varies from meter to meter due to small differences in internal construction After leveling and unclamping the feedback system will stabilize to a gravity reading ranging approximately from 150 xxx to 150 xxx mGal The second line displays internal Meter Temperature in C and Battery Voltage Each gravity meter has a specific optimum nose temperature usually in the range 48 C to 58 C The indicated meter temperature should remain constant at this nose temperature In extreme ambient conditions the temperature may vary by approximately 0 1 C The Battery Voltage is approximately 12V with a fully charged battery The voltage can vary about 0 5 Volts as the internal heating circuitry cycles on off The battery should be replaced or recharged if below about 10 4 Volts Land R Upgrades User s Manual June 1 2009 DISPLAY of FEEDBACK FACTOR There is a factory setting called the FEEDBACK FACTOR It is a gain setting used to convert digital output of the Feedback Board directly into mGal This 5 digit number is typically in the range of 12000 to 29000 and is permanently stored in internal firmware on the Feedback Board It should not be necessary for the user to modify this setting However the LRFB 300 system can display the current stor
17. he warranty is extended by the length of time that the gravity meter is in transit and in the laboratory for repairs The warranty is void if the internal sensing element is opened by an unauthorized person The foregoing warranty is in lieu of all other guarantees expressed or implied and all obligations or liabilities on the part of L and R Meter Service LLC for damages including but not limited to consequential damages arising out of or in connection with the use or performance of the meter Land R Meter Service LLC 2636 W FM 696 Lexington Texas 78947 USA Tel 979 773 4041 Fax 979 773 4042 Cell 512 417 5085 info gravitymeter repair com www gravitymeter repair com 35 L and R Upgrades User s Manual June 1 2009 REFERENCE It is necessary that the operator have a solid understanding of the basic manual adjustments and meter checks Refer to the L and R Model G and D Operating Manual which can be downloaded at www gravitymeter repair com images gdmanual pdf APPENDIX Meter Setup with Feedback Installed The maximum gravity accuracy with electronic feedback is obtained with the long level Galvanometer adjusted not to the old optical sensitivity setting of 10 10 but to maximum gravity as indicated in the LCD readout This is how the long galvanometer is adjusted at the factory and the gravity calibration for the digital readout will only be correct if the meter is adjusted to this sensitivity which is maximum g
18. ile after PDA appends time and location data L and R Upgrades User s Manual June 1 2009 GRAVITY METER OPERATION with FEEDBACK PRE SETTING THE COUNTER SURVEY RANGE LESS THAN 300 mGal If you are at roughly the middle of your survey gravity range then the counter should be adjusted until the gravity indicated in the LCD is close to zero If you are at roughly the lowest gravity of your survey range then the Counter should be adjusted until gravity indicated in the LCD is close to 150 If you are at roughly the highest gravity of your survey range then the counter should be adjusted until the gravity indicated in the LCD is close to 150 This will allow you to use the full feedback range without moving the counter SURVEY RANGE GREATER THAN 300 mGal There are two methods to consider Method 1 Record tie stations on the fly When the gravity displayed on the LCD is close to being out of range make two readings at the same station with different counter settings If you get out of range go back to the last station that was in range The first reading should be at the old counter setting then re range the counter to make the LCD displayed gravity zero 0 0 or close to the opposite end is also useful in some situations The difference between these two readings in mGal is an offset that will have to be added to all subsequent readings in processing the survey If you are performing a high accuracy survey you may want to per
19. marked GRAVITY METER POWER INPUT Wait about 3 hours for meter to reach operating temperature Once meter has reached the operating temperature install one of the Lithium Ion batteries Unplug the Gravity Meter Power Supply that is plugged into the side of the Gravity Meter white box When you have the Gravity Meter Power Supply plugged into the Gravity Meter white box the battery is NOT BEING CHARGED The battery will only be charged while using the Ion Battery Charger Land R Upgrades User s Manual June 1 2009 Vehicle Battery Power Supply Cable Use this cable to keep the meter on heat during transportation in a vehicle Plug into vehicle 12V system cigarette lighter socket Gel Cell Power Supply Cable Use this cable with older style Gel type batteries that have a 2 pin Cannon connector Land R Upgrades User s Manual June 1 2009 L and R FB 300 FEEDBACK UPGRADE A complete package of long term meter servicing and modern hardware software upgrades Compatible with all LaCoste amp Romberg Model G and D Land Gravity Meters the L and R Upgrade Package includes the following 1 Clean and Adjust and Complete Checkout 2 Replace Seals 3 Clean and Checkout Micrometer Screw 4 Rework Gear Box 5 Convert Level Lights to Low Heat LED s if needed 6 Convert Reading Light to Low Heat LED s if needed 7 External PDA with GPS for Data Logging 8 Replace Glass Thermometer with Digital Temperature Batt
20. ng even smaller movements of the level Galvanometers for increased accuracy Next you need to mechanically re zero the level so the Galvanometer needle is centered With a small screwdriver loosen screw on long adj cover plate Turn the cover out of the way but do not remove Using the long hex key sometimes called allen wrench or key provided put it into hole vertically and locate the correct adjustment screw Make sure the allen wrench is properly seated then turn slightly Note which direction the Galvanometer needle moved in If the direction of movement of the Galvanometer needle was correct towards the center then keep turning the adjustment wrench until the Galvanometer needle is centered otherwise reverse the direction You should not have to move it very far less than 1 turn The long level Galvanometer is adjusted properly now The same procedure may be used to adjust the cross Galvanometer just substitute cross for long in the above directions The only complication is that when you move one of the knobs on the LEFT side of the meter Cross legs to change the cross level setting the long level changes also You will have to re level the long level direction every time you move in the cross direction also Rotate the small covers to close back up the openings for the level adjustment and lightly tighten the small screws The cross bubble and cross Galvanometer readouts should indicate the same Position as they are both adjust
21. on ON enables on the LRFB 300 only The meter and feedback system will drift less if the LRFB 300 switch is left ON all day while surveying The rear position W LCD HEAT ON turns on BOTH the LRFB 300 system and the LCD heater This heater enables the LCD display to function in temperatures below 15 C It draws extra power and is not needed above 15 C With a good battery you should get a full day of use out of your meter even with the LRFB 300 on constantly unless it is very cold The center position OFF disables the feedback voltage In the OFF position the gravity meter can be read manually i e the classical method of nulling the CPI Electronic Readout Beam Position Galvanometer and recording the counter reading as in old G meters L and R Upgrades User s Manual June 1 2009 This 2 line extended temperature version LCD display is installed on the black gravity meter lid The display is specified to work in ambient temperatures of 20 C to 50 C With the LCD heater turned on it has been used in field conditions down to 40 C We suggest the Do not store the meter below 20 C with power off Permanent damage to the LCD display can occur If there is power to the meter and the LRFB 300 power switch is set to W LCD HEAT ON there should be no risk of damage The LCD display has a back light to enable viewing in dark conditions The backlight can be toggled ON OFF using a virtual control on t
22. op of the card L and R Upgrades User s Manual June 1 2009 DATA DISPLAY BOARD The Data Display Board is mounted in a black plastic enclosure on the right side of the meter It contains no user serviceable parts In case of field troubleshooting particularly after transportation the operator can check the connectors Note the smaller board in the top center this contains the Bluetooth transmitter to communicate wirelessly with the external PDA data logger ASCII serial data is continuously broadcast from the Bluetooth radio antenna Once the Bluetooth devices are enabled and paired properly a standard terminal program such as HyperTerminal a standard accessory on Windows XP systems can capture the Bluetooth data stream Serial port settings are 2400 N 8 1 Data packets are transmitted at 2 Hz 0 244 43 77 48 6 11 6 0 244 45 79 48 6 11 6 0 244 45 78 48 6 12 0 0 243 44 78 48 6 12 0 0 243 44 79 48 6 12 0 0 243 45 78 48 6 12 6 0 243 46 77 48 6 12 6 0 243 44 78 48 6 12 6 0 243 46 78 48 6 12 6 0 243 45 78 48 6 12 6 0 243 45 80 48 6 12 6 0 243 45 78 48 6 12 6 0 243 44 78 48 6 12 1 0 243 45 80 48 6 12 1 0 243 44 77 48 6 12 1 0 243 46 79 48 6 12 1 0 243 46 79 48 6 12 1 Note that only Feedback Gravity Long and Cross Level value and Meter Temp Battery Voltage are transmitted Time and Lat Lon coordinates are only available from the PDA stored f
23. ot If transferring to a desktop computer consider using an inexpensive SD to USB converter 22 L and R Upgrades User s Manual June 1 2009 PDA SOFTWARE OVERVIEW The data logging software is named MeterLog exe an executable file created with LabView graphical programming language There may be name variations in the future to include software version number A backup copy of MeterLog EXE program is stored on the 1GB SD card included with each upgrade The PDA handheld computer captures the Bluetooth output of gravity meters equipped with the LRFB 300 Feedback Upgrade FEATURES Bluetooth Wireless data logging Large data capacity Record data to SD card for secure storage Automatic or Manual Station Name entry GPS data integrated into software Latitude and Longitude Automatic Tide Correction Continuous data logging at user selected interval LICENSE INFORMATION This program is licensed AS IS without warranty of any kind either expressed or implied including but not limited to the implied warranties of merchantability and fitness for a particular purpose The entire risk as to the quality and performance of the program is with you In no event will L and R Meter Service be liable to you for damages including any general special incidental or consequential damages arising out of the use or inability to use the program including but not limited to loss of data or data being rendered inaccurate or los
24. ravity The meter should have been on heat for as long as possible to minimize drift The Land R LRFB 300 should be switched on for at least 1 hour Level the meter using the Galvanometers Adjust counter screw till LRFB 300 LCD display is reading close to zero 0 0 gravity Note this gravity value Turn the single level knob on the right side of the meter long direction so that the long Galvanometer needle is about v division off center direction doesn t matter Let stabilize for 45 seconds and read gravity off the LCD display 1s it higher or lower than the original reading CORRECT DIRECTION If gravity is higher then your original setting was wrong and you are now moving in the correct direction Turn long level leg again so Galvanometer needle moves another division in the same direction Wait 45 seconds again then take a gravity reading from the LCD If it is higher then keep repeating these steps until the gravity value starts to decrease Then back up just slightly 36 Land R Upgrades User s Manual June 1 2009 WRONG DIRECTION If the gravity reading from the LCD is lower than the previous reading then you went in the wrong direction and need to turn the leveling leg knob in the opposite direction The level Galvanometer needle should move back in the opposite direction also Now follow directions under CORRECT DIRECTION These steps will get you to a maximum value for gravity You should repeat the test usi
25. refully the meter is handled during your survey Minimize any bumping shaking or tilting during the survey Be sure to check the vertical settings for both levels before starting your survey or any time the meter receives a large shock Refer to the G meter manual for more information The basic reading sequence is as follows 1 Keep feedback turned ON throughout the entire survey 2 Level the meter adjust the black level rod knobs on the lid until both the cross and long galvanometer needles are centered 3 Unclamp meter 4 Wait for indicated gravity value to stabilize 5 Record Reading record the indicated gravity reading on the LCD display or log the data wirelessly to the supplied PDA running MeterLog software 6 Clamp Meter move to next station L and R Upgrades User s Manual June 1 2009 DATA LOGGING to PDA via BLUETOOTH PDA OPERATION The PDA model provided is the Pharos GPS Model 535v with Windows Mobile operating system The user should be familiar with the PDA and he Windows Mobile operating system the PDA manual includes troubleshooting tips In particular note The button at the top center of the PDA is the on off button Holding this button down for a short time will reboot the device The location of the SD card GPS antenna port and reset button Overnight charging of battery required before first operation Land R Upgrades User s Manual June 1 2009 BLUETOOTH CONFIG Make
26. ses sustained by any other programs even if L and R Meter Service has been advised of the possibility of such damages MeterLog software is 2009 by L and R Meter Service LLC 23 Land R Upgrades User s Manual June 1 2009 STARTUP Go to the START menu Upper Left Corner Go to the FILE EXPLORER MENU Make sure you are in MY DOCUMENTS Find the MeterLog program Icon use the PDA stylus to start it SAVE AS SCREEN When the program loads the SAVE AS screen is immediately displayed Go to the Location drop down menu and select either SD MMCARD Data stored on removable 1GB SD card or Main memory Data stored in PDA MY DOCUMENTS folder Jr Once you have selected the SAVE AS location press the SAVE box A YES NO Dialog Box will pop up alerting that the file exists and asking Do you want to replace it Answer should be YES Yes No NOTE Previous data will NOT be erased new data will simply be appended to the file 24 Land R Upgrades User s Manual June 1 2009 MAIN SCREEN INDICATORS MeterLog vi Front Panel Gravity mGal Indicator Gravity in mGal GPS Status Indicator Stavty ma Green if OK Black if not OK oom Tide Indicator Computed Tide Correction in mGal Long Level Indicator Relative Level Position in bits Temperature Indicator Meter
27. ut Data Format ASCII text comma delimited Power Consumption 0 2 amp 12 Volts LCD Heater off Input Voltage 10 15 VDC Battery Life for Meter Greater than 15 hours 22 C with LRFB 300 on Specifications are subject to change L and R Upgrades User s Manual June 1 2009 HARDWARE NULLING DIAL CLAMP Use this small knurled screw to lock the Nulling Dial in place when using the Feedback system to measure relative gravity differences This keeps the dial from moving between readings Be sure to unlock the Nulling Dial before moving it ELECTRONIC LEVELS The LRFB 300 Feedback Upgrade for LaCoste amp Romberg G or D meters includes installation of electronic levels All new upgrades use the very robust and stable ceramic liquid type The user should level the meter with the long and cross galvanometers when using the LRFB 300 Feedback system The cross and long level galvanometer needles indicate level when they are centered The old bubble levels are adjusted for manual optical 10 10 sensitivity readout at the factory We suggest you keep this set up refer to the Model G amp D manual for further details Remember that the screw K Factor table is only valid when the long sensitivity is set to 10 10 per the manual Land R Upgrades User s Manual June 1 2009 POWER SWITCH This small 3 Position switch is located on the black lid lower right corner adjacent to the LCD Display The forward positi
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