ALIOD100 UPGRADE USER`S MANUAL
Contents
1. moving the counter dial Be sure to lock the counter using the small clamp Page 5 of 16 screw below the dial after moving the counter This keeps the counter from moving between readings If the survey range is less than 100 mGals 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 the gravity indicated in the LCD is close to 50 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 50 This will allow you to use the full feedback range without moving the counter screw If the survey range is more than 100 mGals you have two choices 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 mGals is an offset that will have to be added to all subsequent readings in processing the survey If you are performing a high a2. liquid type that are very Page 6 of 16 robust and stable It is possible to use the pendulum type if they have been previously installed but the digital level data output may not be valid if the upgrade was done before 2003 The user should level the meter with the long and cross ga vonometers galvos when using the Aliod100 electronic feedback system The cross and long level readout galvo needles indicate level when they are centered The old bubble levels if present newer meters may not have them are adjusted for manual optical 10 10 sensitivity readout at the factory and this is how we suggest you keep it set up see regular Model G amp D manual The maximum gravity accuracy with electronic feedback is obtained with the long level galvo 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 galvo 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 gravity Adjusting Levels with Feedback The meter should have been on heat for a long time for minimal drift and the Aliod 100 switched on for at least 1 hour Level the meter using the galvos Adjust counter screw till Aliod100 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
3. need to match the serial cable to your particular Palm The correct one was sent from the factory On black and white Palms like m100 or mi105 with 10 pin connector you can use the standard Palm serial PC data cable to connect to a PC serial port for data transfers The same cable is used with the Figure 1 Null modem adapter qender changer short 2 part null modem adapter gender changer M M which L amp R provides to connect the Palm to the Aliod100 box Connect the female DB9 serial connection to the two short adapters and then the male DB9 to the Aliod100 and the other end which is a larger black 10 pin connector to the Palm On color Palms with fixed internal rechargeable battery you will need the special L amp R provided Aliod100 serial to Palm cable which has a male DB9 connector on it Connect the male DB9 to the Aliod100 and the other end a larger black 16 pin connector to Figure 2 Special Serial Cable with Male DB 9 and Null modem Gender the Palm changer adapter Warning This special L amp R cable with the male DB9 serial and Palm connectors should not be connected to a PC serial port unless pin 9 is disconnected as it has 5 Volts on it This cable allows the Palm to run off the meter s much larger battery and charger Page 11 of 16 Warning Completely discharging your Palm batteries and meter batteries on Color Palms will result in the loss of the data on the Palm STA
4. other meter electronics will function over this range of temperatures also The LCD heater when turned on allows use of the meter down to 40 We suggest it be turned on below 15 C Do not store the meter below 20 C with power off because permanent damage to the LCD can occur If there is power to the meter and the Aliod100 Page 4 of 16 power switch is set in the down position so that power to the LCD heater is on then there is no problem At higher temperatures new meters are rated to work up to 45 C However most will continue to function up to about 3 4 degrees C below the nose temperature usually 50 55 C for new meters before excessive drift is possible Older meters that are upgraded may have a significantly lower nose temperature and will only function up to 3 4 degrees below whatever their set temperature is The LCD has a small back light that is on all the time to allow viewing in darkness Electronic system The Aliod100 upgrade is composed of a linear feedback system with approximately 100 mGals range and a microprocessor controlled 24 bit A D system The electronics have extremely high gain and electronic damping which means the meter is now more noise resistant than a standard meter There is a 40 second digital FIR low pass filter applied to the gravity data before it is displayed This long filter is necessary to average out the natural background seismic noise present at nearly any location the meter its
5. the long galvo needle is about 1 2 division off center direction doesn t matter Let stabilize for 45 seconds and read gravity off the LCD display Is 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 galvo needle moves another 12 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 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 galvo 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 using even smaller movements of the level galvos for increased accuracy Next you need to mechanically re zero the level so the galvo needle is centered With a small screwdriver loosen screw on long adj coverplate 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 slig
6. 89 4807 31522 31365 51 3 12 5 2892 3 TOP 0005 GRV 4 23 2003 18 49 14 7 109 7 119 0 01 30 389083 97 710389 4807 31522 31366 51 3 12 5 2892 3 BOT 0006 GRV 4 23 2003 18 56 48 10 019 10 01 0 009 30 389083 97 710389 4807 31522 31365 51 3 12 4 2892 3 TOP 0006 GRV 4 23 2003 19 04 59 7 099 7 106 0 007 30 389083 97 710389 4807 31522 31366 51 3 12 3 2892 3 UNITS Gravity and Tide are in mGals Lat Long are in decimal degrees levels are arbitrary numbers between 0 and 60000 Level should be roughly around the middle or 30000 Temperature is in degrees Centigrade Battery voltage is in Volts Older Data Formats The version 1 1 software put out data in the following format which you may run across sometime Station Name Date Time Gravity Long Level Cross Level Sensor Temperature Battery Voltage Counter Value HotSync and Palm OS are registered trademarks of Palm Inc Palm is trademark of Palm Inc and it looks like BOTTOM 0001 GRV 2002 06 11 13 09 05 9 870 31336 31242 48 8 12 1 2761 00 TOP 0001 GRV 2002 06 11 13 19 18 7 192 31057 31418 48 8 12 1 2761 00 BOT TOM 0002 GRV 2002 06 11 13 29 59 9 852 31204 31396 48 8 12 0 2761 00 TOP 0002 GRV 2002 06 11 13 40 02 7 216 31198 31492 48 8 12 0 2 761 00 An even older version of the software omitted the counter value at the end Page 15 of 16 WARRANTY All LaCoste and Romberg gravity meters and upgrades are guaranteed for a period of two year after delivery At the purchaser s request LaC
7. 9 Numeric characters are ASCII 48 57 dec which are o l g 2 e a p 4 5 F 6 og P Q on a nd o K Period is ASCII 14 dec Comma is ASCII 12 dec Space is ASCII 32 dec End 2 characters lt CR gt lt LF gt which are ASCII 13 dec D hex ASCII 10 dec A hex Notes A few early upgrades had the lt CR gt lt LF gt reversed On meters with pendulum levels the level data in the serial output is not valid and can be any random number Connector Hardware Standard 9 pin Female DB9 Sub Minature connector on meter Pin 1 NC Pin 2 Transmitted data from Aliod100 to PC Pin 3 Received data from PC to Aliod100 Pin 5 Ground Internal to the Aliod100 the following connections are made Pins 1 4 6 DTR DSR DCD are tied together Pins 7 8 CTS RTS are tied together Before May 2003 Pin9 NC After May 2003 Pin 9 5 volts for Palm Before connecting directly to a PC please check electrical compatibility Most people making custom data cables only need to connect up pins 2 and 5 Page 9 of 16 Gravlog v2 0 L amp R Gravity Data Acquisition Software for the Palm OS PROGRAM DESCRIPTION This datalogger for the Palm handheld captures ian E the serial output of L amp R G meters upgraded with the a JATION NAME Aliod100 feedback system It stores the data in an gt LINE1 0001 GRY NATE 2003 06 01 internal database on the handheld You can U i examine the data u
8. After 10 2003 the extra switch is on the black box on the side Electronic levels are required on all meters with this upgrade Palm handheld computer In addition to standard Palm features and accessories Lacoste amp Romberg includes a full featured data logger to record the output of the Aliod100 in either field or laboratory conditions The gravity logging software GravLog allows input of station name elevation latitude longitude and counter for each station It can perform automatic tide corrections if correct Lat Long and GMT time are entered The user can either manually record single data points per station or set it to record continuously at the selected time interval All data including time gets recorded to the solid state memory for later transfer to a PC A cable to connect the Palm to the serial port on the Aliod100 box on the side of the meter is included The black and white Palms use the standard Palm to PC serial transfer cable with a L amp R supplied null modem gender changer M M adapter to connect to the Aliod100 If you have a color Palm with a rechargeable battery then a custom L amp R Serial cable is supplied that connects directly to the Aliod100 and allows the Palm to run off of the G or D meter battery charge the internal Palm battery and acquire data at the same time In addition to the standard Palm to PC USB cradle This cable is useful for those long field days and for continuous data logging for days at
9. E station prefix Five prefixes are stored in the program You LINE1 0001 GRY can select the desired prefix from the list of station prefixes PREFIX amp LinE1 by pressing on the up down arrows just before the actual VALUE 1 station name The second part is the station number Itis a INCR 1 4 digit number The third part of the station name is the SUFFIX GRVW suffix You can leave the suffix blank if you want Each time you press the NEXT button on the main form the Station Name a station number is incremented automatically The updated STATION NAME station name will be displayed LINE 1 0001 GRY PREFIX LineE1 Open the STATION NAME form to interactively change the VALUE o station prefix the station number the station number INCH increment and the station suffix Open the Station Name SUFFIX BOTTOM form by pressing the small down arrow triangle between STATION NAME and NEXT on the main screen of GravLog Page 12 of 16 ITEMS UNDER DATA MENU Browse Data Counter Value Many user entry and data management functions are under EEsatios the main Data menu select L amp R then Data From this menu Earth Tide you can Browse Data enter Counter value enter Elevation case enter Lat Long view Earth Tide data change the record Data __ Delete Database J 0 Interval manual or periodic and upload data to PC rah Ee a START BROWSE DATA You can initiate the data browser by selecting the L amp R menu r EET ap D
10. RTUP The button at the top center of the Palm is the on off button Press it Find the Gravlog program icon on the home screen of STATIONNAME your Palm If you don t see icons then press the home icon in LINE1 0001 GRY the lower left below the display screen The GravLog icon is ee elt L amp R with GravLog beneath it Use the stylus to start it Then ELEY 0000 00 press START on the main GravLog screen to open the serial COUNTER 0000 00 port enabling the incoming data to be captured and GRAVITY PUSH l T C Gray START displayed The menus at the top will change to DATA and START OPTIONS DATA LOGGING Data options J When you are ready to save the data press the SAVE button STATION NAHE to store the current data values into the database This is the LINE1 0002 GRY manual mode You can enter continuous data logging mode 2003 04 26 TIME 13 37 01 by pressing the center button which also displays the data ELEY 00110 00 logging interval in seconds in this case 60 COUNTER 2791 09 GRAVITY 0 021 An active serial port draws a large amount of battery power ee l SAVE JC Gls JCSTOP After a series of readings have been taken at a station it is SAVE Cots NETE recommended that you close the serial port by pressing STOP You can re open the serial port again at the next station by pressing START STATION NAMING Station Name i The station name consists of 3 parts The first section is the STATION NAM
11. _ LaCoste amp Romberg The first name in gravity since 1939 ALIOD 100 Electronic Beam Nulling ALIOD100 UPGRADE USER S MANUAL revision 2 1 11002 Metric Bivd Ste 100 Austin TX 78758 USA phone 512 346 0077 fax 512 346 0088 email info lacosteromberg com www lacosteromberg com Contents of this manual are Copyright 2002 2003 LaCoste amp Romberg LLC Updated Sept April 2003 The Aliod100 Upgrade LaCoste amp Romberg s Aliod 100 linear electronic feedback system features a new level of accuracy precision and reliability The Aliod 100 incorporates a new user friendly interface that enhances customer convenience No longer is there any need for a KFactor lookup table as this new system displays the gravity directly in mGal on an easy to read LCD display The new Aliod 100 feedback system has a range of approximately 100 mGal 50 with a resolution of 0 01 or 0 001 mGal for the 100x The Aliod 100 also outputs a stream of ASCII data which can be displayed and recorded using Gravlog for the Palm OS or any terminal program on a PC with a RS232C port The Aliod 100 includes our standard warranty printed at the back of this manual New Meter Hardware The new hardware for this upgrade on a G or D meter consists of an added LCD display on meter lid a power system board in small black metal box on left side of meter feedback and level electronics inside meter and an additional switch on the lid
12. a time A Null modem Gender changer F F is provided to allow this cable to transfer data to PC Page 2 of 16 ALIOD100 SYSTEM SPECIFICATIONS Electronic System Principle Data Resolution Range Repeatability Linearity Electronic Drift Calibration factor User Interface Digital Display Output Data Format Power Consumption Linear electrostatic feedback 0 01 mGal or 0 001 for Aliod 100x approximately 100 mGal In field conditions 0 01 to 0 02 mGal Better than 0 01 Full Scale lt Q 001 mGal 1000 hr does not include sensor drift Set at factory in Flash memory 2x16 character LCD with backlight LCD heater for use below 15 C RS 232C Serial Port with continuous data output ASCII text comma delimited Current 0 190 Amp 12 Volts LCD Heater off Meter Input Voltage 10 15 VDC input range usable Battery life for meter Greater than 15 hours Electronic Liquid Levels required At 22 C with Aliod100 on Export License required for sale some countries Specifications are subject to change Palm is trademark of Palm Inc Page 3 of 16 USING YOUR ALIOD100 Power There is an small toggle switch on the meter lid that turns the Aliod100 electronics on and off It is usually on the right side of the lid Most meters built after April 2003 have a three position switch The center position is off The up position turns on the Aliodd100 only The down position turns on the Aliod100 s
13. ata then Browse Data function The most current data Station LINE1 0004 GRY record will be displayed You can scroll through the data by Date 2003 04 28 clicking the left and right arrow Note that record 1 contains LL ae Bais 0 035 the most recent data Counter 2791 09 Eley 00110 00 Levels 31082 31800 You can delete an individual record from the database by Tempi 49 9 125 selecting DELETE COU NTER Counter Value Enter the counter by selecting the L amp R menu Data Counter Update the Counter Value Use the up and down arrows to cycle thru the numbers for Pa ae ee each digit Then press accept This must be manually 0 0 0 0 0 0 performed each time the counter is moved It will get recorded with each data point for later processing Kfactor correction etc ELEVATION Elevation You can enter an elevation value by selecting the L amp R menu Data Elevation Use the up and down arrows to cycle thru the numbers for each digit Then press accept This must be manually performed each time you want to change the elevation Enter the elevation LAT LONG LatLong You must enter Latitude and Longitude information for the LATITUDE tide corrections to be correct For small survey areas it is OK 30 e 23 m 20E NjA to leave this fixed a LONGITUDE 97 Ja alm GAE al Page 13 of 16 EARTH TIDE TIDE Earth Tide Displays the actual tide value time latitude and longitude The time set on the Palm must be set to GMT
14. ccuracy survey you may want to perform 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 careful track of them The Palm and Gravlog data logger software will make this easier 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 Kfactor 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 gt 100 mGals 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 Level information Lacoste amp Romberg G or D meters with the Aliod100 upgrade must be equipped with electronic levels All new upgrades use the ceramic
15. elf and the electronics have a very low noise floor and would not need nearly as much filtering The temperature and battery voltages are acquired with less accuracy and filtering but they are more than adequate for the purpose The display is updated two times a second All the data on the display and additional information is sent out the serial port on the side of the meter This Aliod100 serial data can be recorded by the included Palm handheld and Gravlog software using a special cable provided The Palm also comes with a serial cable for transferring recorded data to a PC See the Gravlog documentation and the Serial Data Output Information section for more information on this system Acquiring data The power switch for the Aliod100 should be left on during your survey This is the inner switch of the pair in the lower right corner of the meter lid All gravity meters are fragile instruments Data quality repeatability and accuracy is dependent on how carefully 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 Level the meter using the cross and long galvos on the lid by turning black knobs until both indicator needles are centered See G meter manual for more details Be sure to unlock the counter using the small clamp screw below the dial before
16. htly Note which direction the galvo needle moved in If the direction of movement of the galvo needle was correct towards the center then keep turning the adjustment wrench until the galvo needle is centered otherwise reverse the Page 7 of 16 direction You should not have to move it very far less than 1 turn The long level galvo is adjusted properly now The same procedure may be used to adjust the cross galvo 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 galvo readouts should indicate the same position as they are both adjusted to maximum gravity anyway Only the long sensitivity axis may have different settings for the galvo and the bubble levels It should be noted that the Screw Kfactor table is set up for optical readings and can be off slightly lt 1 when moving the counter for re ranging purposes while using the feedback system Serial Data Output Information ASCII serial data is always sent out the female DB9 port on the side of the upgrade box A special serial to Palm cable is provided fo
17. or UTM for the tide calculation to be correct Change the time from the main Palm Home icon on lower left of display by pressing on the time You can introduce errors up to 0 6 mGals if the time EARTH TIDE 0 023 mGal lat or long is not correct DATA INTERVAL INTERVAL Continuous Read This sets the continuous data logging interval from a number of choices This number is displayed on the main GravLog screen at the bottom between SAVE and STOP in the 0 a 0 eai continuous data logging button Push this button on the main rr screen to start continuous logging Select the Data Interval UPLOAD TO PC Upload to PC iJ This is the data transfer function The field data are stored in pc an internal database The data can be uploaded to a PC via an the standard serial HotSync cable B amp W Palm or for color 2 Start terminal program Palms use the special serial cable with a male DB9 pam eer connector and the provided gender changer F F and null modem adapter see Figure 2 Alternatively a standard 4 records in database aftermarket Palm Serial cable will work just make sure you START CANCEL get the correct one with no adapters needed To transfer the data to the PC start a terminal communications program on the PC This can be Hyperterminal which comes with Windows usually installed under Accessories or any other 3 party communications program The transfer protocol is just ASCII text Set the serial por
18. oste and Romberg will make all necessary adjustments repairs and parts replacements All parts will become the property of LaCoste and Romberg on an exchange basis This guarantee will not apply if such adjustments repair or parts replacement are required because of abuse 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 LaCoste and Romberg laboratory in Austin Texas The period of the guarantee is extended by the length of time that the gravity meter is in transit and in the laboratory for repairs The guarantee is void if the internal sensing element is opened by an unauthorized person The foregoing guarantee is in lieu of all other guarantees expressed or implied and all obligations or liabilities on the part of LaCoste and Romberg LLC for damages including but not limited to consequential damages arising out of or in connection with the use or performance of the meter Page 16 of 16
19. r the Palm If you have a Palm with internal rechargeable batteries this cable will power and charge the Palm from the gravity meter power also Optionally a straight thru 9 pin serial cable male one end female other end will connect the meter to any standard PC serial port This data can be recorded using any standard terminal or communications program L amp R can provide an unsupported Labview Windows program that can filter display and record the data at arbitrary intervals for those customers who need this capability The serial port settings are 4800 N 8 1 4800 baud No parity 8 bit data 1 stop bit The data packets are sent out at a 2 Hz rate The overall packet format is Sync 1 byte Data 35 bytes End 2 bytes or 38 bytes total in each data packet For example lt SYN gt 3423 122 31289 32001 53 8 12 6 lt CR gt lt LF gt where lt gt brackets are around unprintable ASCII codes and are not part of the actual characters in the packet Sync 1 character ASCII SYN 22 decimal or 16 Hex not printable Data is divided as follows Page 8 of 16 Mgals 4 numeric characters period 3 numeric characters comma space 2637 978 Long Level 5 numeric characters comma space 32195 Cross Level 5 numeric characters comma space 33422 Meter Temp 2 numeric characters period 1 numeric char comma space 597 Battery Volts 2 numeric characters period 1 numeric char comma 12
20. sing the build in database COUNTER 2805 90 browser The data can also be transferred to a PC GRAVITY 0 212 T C Grav 0 262 fi for further analysis A backup copy of the program ye on floppy disk is provided with each system p FEATURES Large data capacity User data entry Automatic or manual Station Name entry Elevation Latitude and Longitude Counter Value Automatic tide corrections Continuous data logging at user selected interval Copyright 2003 LaCoste amp Romberg LLC 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 LaCoste amp Romberg 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 losses sustained by any other programs even if LaCoste amp Romberg has been advised of the possibility of such damages The program will not work on ver 3 1 or earlier of the Palm OS HotSync and Palm OS are registered trademarks of Palm Inc Palm is trademark of Palm Inc Page 10 of 16 SETUP You should be warned that there are at least 2 different and incompatible connectors on various Palms so you
21. t setting to 4800 8 N 1 You can store the data in a file on the PC by selecting the option on the terminal program to capture the incoming text In Hyperterminal select Transfer then Capture Text Connect the Palm to the PC using the correct serial cable Press the START button to initiate the transfer You will be prompted when the data transfer is finished Close your terminal program down you may have to disconnect first depending on what program you are using If your PC only has USB ports you will have to get a USB to Serial port adapter which are available at most computer stores Install the driver and connect it up to the PC USB port and the serial connector from the Palm Proceed as above DATA FORMAT ON PC Page 14 of 16 The data records are comma delimited If you save the file on your PC with the extension CSV then any spreadsheet like Excel can import the file directly The data fields in each record for version 20 software are Station Name Date Time Gravity Tide Corrected Gravity Tide Latitude Longitude Elevation Long Level Cross Level Sensor Temperature Battery Voltage Counter Value And it looks like BOT 0004 GRV 4 23 2003 18 30 50 10 002 9 99 0 012 30 389083 97 710389 807 31523 31365 51 3 12 4 2892 3 TOP 0004 GRV 4 23 2003 18 37 00 7 106 7 117 0 011 30 389083 97 710389 4807 31523 31365 51 3 12 4 2892 3 BOT 0005 GRV 4 23 2003 18 43 15 10 005 9 994 0 011 30 389083 97 7103
22. ystem and the LCD heater The heater enables the LCD display to function in temperatures below 15 C but draws extra power and is not needed above 15 C The meter and feedback system will drift less if the Aliod100 switch is left on all day while surveying With a good battery you should get a full day of use out of your meter even with the Aliod100 on constantly unless it is very cold Display information The LCD panel on the top of the meter has two lines of information The first line displays the feedback system gravity in mGals This value can be from 50 to 50 mGals The Aliod100 displays two decimal digits xx xx and the Aliod100x displays three digits xx xxx of gravity If the feedback system is out of range to the negative side then a small arrow lt appears to the left of the number If the feedback system is out of range to the positive side then a small arrow gt appears to the left of the number The second line of the display shows meter temperature in degrees Celsius and the battery voltage in Volts The meter temperature should remain constant at the nose temperature for that meter somewhere between 48 and 58 C In extreme ambient conditions the temperature will vary 0 1 degrees normally The battery needs to be replaced or re charged when the voltage gets below about 10 6 Volts The LCD is an extended temperature version and is specified to work from ambient temperatures of 20 C to 50 C The
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