FG5 System Interface Module Operator`s Manual - Micro
Contents
1. The purpose of the electronic and mechanical systems for the superspring is to isolate the reference mass from any vertical motion of the instrument in order to keep the path length of the test beam constant Three systems provide coarse and fine adjustment of the spring support structure a motor attached to the top of the mainspring a linear actuator coil and magnet system and an aneroid wafer assembly A controller circuit board drives the motor and the coil and magnet system while the aneroid wafer assembly responds automatically to temperature changes A sphere detector system similar to the one used in the Dropping Chamber provides information on the position of the reference mass relative to the mainspring support system An infrared LED and a photo detector are mounted opposite each other inside the mainspring support housing A sphere attached to the bottom of the mass focuses the light from the LED onto the detector which transmits the resulting signal to a sphere signal preamplifier N The zero position of the sphere on the test mass can be adjusted by moving the top of the main spring with a small DC motor with a very large gear ratio for fine control Micro g LaCoste Tele g Remote Operation User s Manual The main servo electronics control the coil magnet forcer moves the main spring support in such a way to keep the main spring length constant This active servo effectively weakens the main spring synthesizing a long peri2. Drop Sphere BiPolar 20 Drop Cart BiPolar 20 Fringes Setup Trigger Cart Trigger Position r Coupling C Hardware Rising High Falling Low AC coupled Software 7 25 Fal 4 6 DcC coupled Trigger Level 0 3 Data Points 1000 Default Settings Figure 12 A2D Setup screen in Tele g In addition to the channel scale factors the user can also change the trigger points for Dropper OSC mode to get the fringe signal sampled at a convenient time this adjustment is only possible in Software trigger mode The trigger is based on the position of the dropper cart 5 V at the bottom of the travel and about 4 V at the top In order to avoid aliasing of the fringe signal it is necessary to sample the fringes when the cart is traveling slowly near the top and bottom of the travel Typical values are shown in the trigger 19 N 4 SOFTWARE Third Party Micro g LaCoste Tele g Remote Operation User s Manual 4 1 Introduction The Tele g remote system described so far works perfectly well on the actual system controller No mention has yet been made of remote access To facilitate this access two third party programs Virtual Network Computing VNC distributed by RealVNC at www realvnc com and Secure Shell SSH distributed by SSH Communications Security at www ssh com can be employed 42 VNC Virtual Network Computing While a full discussion of VNC an
3. Note that the Destination Port has to be 5900 desktop number assigned by the VNC Server on RR zero in this example The Destination Host is the address of RR behind its firewall Finally the Listen Port can be set to whatever you like 0 through 9 though choosing zero might make things confusing 2 is used in this example Save this SSH connection as a profile with a convenient name so you can use it again e g 123 456 789 0 Use this connection and connect to 123 456 789 0 as a normal user entering username and password for your account on 123 456 789 0 At this point you do not need the SSH connection for anything but you do need to leave it connected It is perhaps best to minimize it Next open VNC Viewer on the local machine LL Have it connect to address 90 0 0 17 2 Yes you are indeed asking it to connect to itself The important part is that 23 N you are having it listen on port 5902 The SSH that is running in the background will now redirect the request for this local port through the firewall tunnel at 123 456 789 0 to the remote VNC Server 192 168 0 4 0 Micro g LaCoste Tele g Remote Operation User s Manual Now enter the password for VNC Server the remote computer RR and run Tele g A flowchart of the whole system is shown in Figure 15 Public Ethernet Remote Firewall Machine FF Local Firewall Machine 95 123 456 789 0 Address irrelevant
4. Running SSH Server Private LAN Private LAN Local Machine LL Remote Gravimeter Machine RR Address 90 0 0 17 Address 192 168 04 Running SSH Viewer listening on local Running VNC Server on port 5900 port 5902 to tunnel through FF to RR Running VNC Viewer connected to 90 0 0 17 2 Figure 15 VNC SSH tunneling diagram 24
5. 15 5 TUNNELING DIAGRAM cccccccsscssccscseeeeeeeeeeeeeeeeeseeeeeeeseeeeeeeeeenees 24 N 1 INTRODUCTION Micro g LaCoste Tele g Remote Operation User s Manual 1 1 Design The Tele g Remote Gravimeter Operation system is designed to allow remote access to the system controller computer of a gravity meter In addition to accessing g the gravity measurement software the system has its own software package Tele g that allows the monitoring of a large portion of the system components These include e The system tilt verticality Superspring position Superspring mode Dropper tuning Dropper mode Interferometric fringe amplitude measurement In addition a few parameters can be adjusted through the Tele g interface These include e Resetting the tilt position and thus verticality back to zero Changing the superspring position Enabling Disabling the Superspring servo Changing the dropper controller mode 1 2 Components The complete Remote Gravimeter Operation system is comprised of hardware upgrades to FG5 gravimeter an electronic component known as the System Interface Module SIM and the Tele g software program In addition to facilitate networking the system controller for remote access two additional third party software packages can be used 1 3 Application Examples The Remote Gravimeter Operation system is designed for either long or short term monitoring of a remote FG5 The system be
6. Remote Operation User s Manual f Tiltmeter Uy Tiltmeter Controller DER XY Tilt 00062 00034 Tittmeter x 0 0085 y 0 0036 Zero Tittmeter Figure 10 Level Control windows in Tele g The red curve shows the tilt about the X axis and the blue curve shows the tilt about the Y The large window shows the two tilt meter values as a function of time Red corresponds to tilt about the X axis while blue corresponds to Y To change either the horizontal or vertical axis scales simply double click on the graph The small windows shows the current values of the tilt and allows AUTO LEVEL to be enabled for both the X and Y axes Simply press Zero Tiltmeter to tilt the Superspring tripod back to where the tilt meters read zero 3 5 Dropper Control Figure 11 shows the dropper controller window When accessing the dropper controller modes the program will warn you that it has to switch to a different sampling mode 17 Micro g LaCoste Tele g Remote Operation User s Manual Uy Tele g Dropper Controller Py Fie view Graph Controller Window Remote Help 5 El Micro g Solutions Inc Dropper Controller Dropper Oscillak Remote Disabled Figure 11 Dropper Controller window in Tele g The Status box indicates the current status of the dropper controller lift drop OSC or standby and the current cart position in Volts To initiate OSC mode si
7. cart at a specified velocity and to track the test mass during free fall The motor drives the cart test mass assembly by turning a pulley and stainless steel drive belt which is attached to the cart The motor also turns an optical shaft encoder that provides accurate information to the dropper controller on the position and velocity of the pulley Information on the relative position of the test mass to the cart during free fall is provided by comparing the interferometric fringe output position of the test mass with the shaft N encoder information position of the cart The dropper controller uses this information to determine whether to maintain increase or decrease current to the motor to achieve the appropriate relative position of the cart and the test mass This feedback system is a conventional analog servo system Micro g LaCoste Tele g Remote Operation User s Manual In OSC oscillation mode the cart slowly moves the test mass up and down to generate slow and uniform optical fringes in the interferometer An oscilloscope attached to Fringes in the output portion of the SIM can be used to measure the fringe amplitude The position of the cart is indicated by the CART POS LEDs To automatically stop OSC mode simply press TRIG or DROP and the cart will stop at the bottom of the next cycle Do not press RESET as this will place the cart into freefall which could possibly damage the test mass 2 1 2 2 Operation Using
8. controller has local IP address 192 168 0 4 is running VNC Server on desktop 0 and is behind a firewall Let s assume the firewall FF has a public IP address 123 456 789 0 Let s assume your local machine has it s own local IP address 90 0 0 17 and let s refer to the machine as LL On LL open the SSH program go to Settings Connection Tunneling and enter parameters following Figure 14 22 Micro g LaCoste Tele g Remote Operation User s Manual Profile Settings Connection Cipher List Configure secure tunnels that are initiated from the local computer Authentication to the server Communication will be secured between the local computer and the server but insecure beyond the server The settings will take effect upon next login Colors Keyboard Tunneling File Transfer Remote Favorites Global Settings Appearance Font Colors Messages User Authentication Keys Display Name Outgoing Incoming Listen Port Dest Host Dest Port Allow Certificates SSH Accession PKCS 11 Listen Port 5902 OK Configuration Authenticatior Allow Local Connections Only E Host Keys Destination Host 192 168 0 4 saci Certificates LDAP Servers Destination Port 5900 Help File Transfer Advanced E Type TCP z OK Cancel Figure 14 SSH Setup for connecting through a firewall
9. the tilt system will provide a measure of possible change in beam verticality throughout the gravity measurement Also for long term measurement applications the leveling system can be used to restore the gravity meter to its original verticality There are two main mode classes for the leveling system AUTO and MANUAL In both cases it is possible to separately level system along the X and Y axes Both axes can also be leveled simultaneously in AUTO mode The MODE switch is used to cycle between these five modes and the selected mode is indicated by the LED Once a mode is selected it will only be activated when the ENABLE button is pressed This allows power to reach the selected motor leg s on the Superspring tripod In MANUAL X or Y mode the MANUAL knob can be used to drive the selected leg up or down The output of the tilt meters can be monitored at the X and Y BNC connectors The output of the tilt meters is discussed in Section 2 4 2 1 5 The Tele g and g Software Interfaces The software portion of the SIM is shown in Figure 5 10 Micro g LaCoste Tele g Remote Operation User s Manual Figure 5 The Tele g and Software Interface The REMOTE button is used to toggle between two modes local and remote Local mode allows user operation of the SIM buttons as described above Remote mode disables the buttons and allows the Tele g program on the system controller computer to operate the electronics Note that the
10. the FG5 as described in the 5 manual 2 4 The Tilt Meters The tilt meters used in the Remote Gravimeter Operation System are each individually calibrated but have the following approximate characteristics Full range 3 Output 2 2arcsec mV The tilt meters are set at the factory to read zero when the system is nominally leveled During shipping large temperature changes or even system setup the meters may be disturbed and depending on the actual tilt meters installed can take up to a few hours to truly read zero again This is why during setup it may be necessary to use MANUAL level to fine tune the Superspring level It is important to understand that the system resets the verticality by driving the tripod legs until the tilt meters think they are at zero If for some reason the tilt meter zeroes have been reset or disturbed using AUTO level will drive the system to a new non vertical setting Therefore it is important that BEFORE LEAVING THE SYSTEM TO RUN VERIFY THAT WHEN AUTOLEVEL IS ENABLED THE TEST BEAM REMAINS VERTICAL In other words with the alcohol pool in the interferometer and without adjusting the verticality enable AUTO level and verify that the test beam is still vertical At this point should the tilt meters read something other than zero it should be okay to remotely AUTO level the system to restore verticality If AUTO level causes the system to no longer be vertical this is probably because the ti
11. used to verify that a meter set up to run for a long weeks period of time is still functioning The user can check system tilt verticality and make adjustments to it The user can also reset the Superspring position if necessary And if the system stops due to a power outage or a hardware reset in most cases it can be restarted remotely Even for short overnight applications the system is highly useful In time critical surveys the meter can be checked in on to verify that things are still functioning properly N 2 HARDWARE Micro g LaCoste Tele g Remote Operation User s Manual 2 1 The System Interface Module The electronics for the Remote Gravimeter Operation System are housed in the System Interface Module SIM This unit replaces the separate Patch Panel Superspring Controller and Dropper Controller of previous FG5 systems In addition the SIM provides tilt meter control and a separate communication link for the Tele g software program Functionally the SIM can be divided into five sections e The Outputs The Dropper Controller The Superspring Controller The Auto Level Controller The Patch Panel to the Tele g and g programs The SIM be in either Remote or Local mode Remote mode is discussed in Section 3 where the system is accessed through the Tele g program Local mode is actual at the instrument button operation of the electronics 2 1 1 The Outputs The outp
12. 0 2 2 ASSEMBLING THE SUPERSPRING AUTO LEVELING 002 12 2 3 SETTING UP THE TELE G ENABLED FG5 GRAVIMETER 13 2 4 THE TILT METERS i cccosssvacssesssecenctondecvesescvaccesveusdersneccdeducsedveteast ocausvetucossevcedecsxes 14 3 SOFTWARE TELE G iu cscssssssssssssssssssssssssssssssssssssssesssesssesssesssesesesssesesesesess 15 3 1 INTRODUCTION cccsssscecccccccccssssescsccccccssesssscsccesceseeseusscsscsccesseausseseesscseseaueaes 15 3 2 STARTING Uetevsdeaoeeeeace 15 3 3 SUPERSPRING 110 15 3 4 LEVEL CONTROL ccccccccccccccscssssssccccccccssucssescccccscessusssescceccseceseussscseesseeeseususcsees 16 3 5 DROPPER CONTROL 50 17 3 6 A2D SETUP ess 19 4 SOFTWARE THIRD PARTY ccccccscssscscscssscssscssscssssssscssscssscscscscccscsesssesess 20 4 1 INTRODUCTION 20 4 2 VIRTUAL NETWORK 2 0 0 0 20 4 2 1 Setting up the VNC Server the System Controller 21 4 2 2 Setting up the VNC Viewer 22 4 3 SSH SECURE SHELL FOR CONNECTIONS THROUGH FIREWALLS 22 Micro g LaCoste Tele g Remote Operation User s Manual Table of Figure
13. Mic RO LACO STE WWW MICROGLACOSTE COM FG5 System Interface Module Operator s Manual WITH REMOTE OPERATION PACKAGE INSTRUCTIONS MARCH 2006 N Micro g LaCoste Tele g Remote Operation User s Manual TABLE OF CONTENTS TABLE OF FIGURES Do sisssscssccssccscsesscesaccscsesecccesesssssesesecesecesecesecesesesesesesesesesesececeseccscoasetes 3 1 GN PRODUCTION oisscciscccsccdccccdsdisscdcssdscctdscsscvsvstesevcdstesesiesssseccdesssovesssscscedslesavcess ectes 4 1 1 4 1 2 COMPONENTS cccccsssssscsccccccccssssssescccccceesssssesccsscssessuussesccssceesessussessceseseauueusscsscs 4 1 3 APPLICATION EXAMPLES 4 2 HARDWARE sisccccccccsccscccscsccccesescoccosssccecesdsocacesssecccessssencessdecocedssececessseaccesnscencesssoceeds 5 2 1 THE SYSTEM INTERFACE 0 000 0 000000 5 2 1 1 EE E Eae EE TE En aaie 5 2 1 2 The Dropper Controller sssicnccianissanesnhesaseaddoubewbailerntinsatasbinseratioahsantesadeuizandes 6 2 1 3 The Superspring Controller 8 2 1 4 The System Leveling 9 2 1 5 Tele g g Software 2 1
14. TRIG button in the Dropper Controller section of the SIM is enabled whether or not the system is in REMOTE mode The BNC connectors in this section are all inputs The Ion Pump and Laser inputs are used in the g software for diagnostic purposes CHs 3 4 and 7 10 are auxiliary inputs for user defined functions or future upgrades For past 5 users note that the rest of the connections barometer triggers Superspring sphere are now all connected internally 11 N Micro g LaCoste Tele g Remote Operation User s Manual 2 2 Assembling the Superspring Auto Leveling Tripod Figure 6 shows the assembled Superspring tripod and Superspring Figure 6 Superspring on Auto Leveling Tripod The small box on the tripod houses the tilt meter and electronics It also sends power to the motorized legs that live in the cylindrical housings The leg nearest the small box is referred to as the Y leg and the other is the X leg Level the X axis before leveling the Y axis however in fully AUTO mode both legs are activated simultaneously 12 N 2 3 Setting up the Tele g Enabled FG5 Gravimeter The tilt meters employed in the Remote Gravimeter Operation System are highly accurate and highly reproducible but they are sensitive large rotations and vibrations For best results do not turn the tripod upside down during assembly In fact it is best to keep the tripod as horizontal as possible during the assembly process Micro g LaCoste Tel
15. d how it works are beyond the scope of this manual a few features focusing on the Tele g application are described below VNC simply displays the desktop of a remote computer on a local computer Figure 13 shows Tele g running on a remote computer displayed in a window on the local computer The local computer runs the VNC Viewer while the remote machine runs the VNC Server 20 Micro g LaCoste Tele g Remote Operation User s Manual File View Graph Controller Window Remote Help Solutions Inc Tiltmeter Super Spring Tiltmeter Controller Super Spring Controller D itmeter Tiltmeter Controller XY Tilt 00140 Y 00007V 10 0057 0 0006 Zero Tittmeter Bz E 11 5214 11 5219 11 52 24 11 52 29 11 52 34 11 52 39 11 52 44 11 52 49 11 52 54 Time 5 Super Spring Cy Super Spring Contr EBX Super Spring Se Super Spring 0 2382 V Sphere Position 0 2383 Servo Zero Spring 2 0 23840 5 gt 0 23835 0 23830 0 23825 0 23820 1 1 1 1 1 1 1 11 52 13 11 52 18 11 52 23 11 52 28 11 52 33 11 52 38 11 52 43 11 52 48 11 52 53 11 52 5 Time f Remote Disabled NUM CustomTree Microso TestTreeControl Mic Re
16. e g Remote Operation User s Manual When stored in the transit case the motor legs are detached from the Superspring tripod and it is necessary to assemble them The process is quick and quite simple While keeping the tripod as level as possible place the Y leg short cable connection in the tripod hole nearest the small tilt meter box Place lock nut shown in purple up from below to lock the leg in place a wrench is also provided to tighten the nut if necessary Then snap the foot to the bottom of the leg Repeat the process for the X leg Finally connect the two small cables from the leg to the tilt meter box and connect the red LEMO connector to the back of the SIM Figure 7 Superspring tripod during assembly The Y leg is shown without the foot Before snapping the feet in place it is necessary to insert and tighten the lock nuts shown in purple 13 N Then place the center of the tripod over the spot where gravity is to be measured Turn on DC power on the FG5 power supply use the SIM in AUTO level mode to level the tripod Measure the lower reference height Micro g LaCoste Tele g Remote Operation User s Manual Place the Superspring in the tripod If necessary use MANUAL X and Y to fine tune the tripod so that the Superspring bubbles are level If the bubbles were very far from level it may be necessary to remove the Superspring and re measure the lower reference height Turn off DC power and assemble the rest of
17. lt meters have not reached equilibrium If after a day or so this is still the case it is possible to rest the zero of the tilt meters using the adjustment screw on front of the SIM Again though if the system is just being set up and it is likely that the tilt meters are not in equilibrium do not adjust the screws use MANAUL X and Y to fine tune the tilt of the tripod 14 N Micro g LaCoste Tele g Remote Operation User s Manual 3 SOFTWARE Tele g 3 1 Introduction The software portion of the system is actually composed of a few separate components Tele g which be used locally or remotely to access the gravity meter g which is used to run the gravity meter and acquire data e Third party software to facilitate remote connections to the gravity meter system controller Tele g is designed to allow computer access to the hardware described in Section 2 The Dropper Controller Superspring Controller and Leveling functions can all be operated using Tele g 3 2 Starting Tele g When Tele g starts the user is presented with the dialog box shown in Figure 8 Card Name Identiher Card Name DaaBoard2k1 DaqBoard 2000 OK Figure 8 Initialization screen Tele g Normally the default settings are correct This tells Tele g which of the two DAQ cards to communicate through the g software communicates through the other card 3 3 Su
18. mateG Microsoft 4 Figure 13 VNC display with Tele g running on a remote computer 4 2 1 Setting up the VNC Server on the System Controller The first step is to run the VNC Server on the system controller which will be the remote machine when accessed from afar Simply run VNC Server and take note of the IP address and desktop number It is also necessary to assign a password for the session the first the VNC Server is run It is recommended to create a shortcut for the VNC Server and place it in the Windows Start Menu Startup folder This way during any reboot after a power outage for example remote access to the machine will still be possible Finally a note about desktop number The desktop numbers are assigned by the server and can be through 9 The VNC Server opens port number 590X on the server computer where X is the desktop number As an example if the server assigns desktop 0 for the session the system will be listening for viewer connections on port 5900 21 N 4 2 2 Setting up the VNC Viewer The VNC Viewer can be installed on any machine including Unix machines or even run through Java on a web browser Simply tell the Viewer to connect to the IP address of the Server followed by a gt and the desktop number that the Server is running on As an example let s assume the IP address of the system controller computer 15 111 222 333 444 We would then ask our VNC Viewer to connect
19. mply press the Oscillate button The motion of the cart will be apparent on the Cart graph To gracefully stop OSC mode press Trigger This will stop the cart at the bottom of the next cycle During OSC mode the system will sample the interferometric fringe signal and display it in the upper graph This allows the user to measure the amplitude of the fringe signal To put the dropper in Drop mode necessary for data acquisition press Drop Then to manually lift the cart press trigger and to initiate a drop press trigger again To allow the software to initiate drops simply leave the dropper in this Drop mode Note that during the drop the sphere signal is displayed on the upper graph This is a representation of the distance between the test object and the drag free cart See the 5 manual for a full discussion of the sphere signal 18 NUM N 3 6 A2D Setup Micro g LaCoste Tele g Remote Operation User s Manual As mentioned above Tele g communicates with the hardware via a second A2D DAQ card The setup screen for this communication is shown in Figure 12 Itis accessed by going to View Channel Setup or F4 Normally the default settings are optimal However the user does have the ability to change the input scales offsets and multipliers lOTech Setup Channels Type Range Offset Multiplier On Fringes BiPolar 20 X Tilt BiPolar 20 Y Tilt BiPolar 20 S S Sphere BiPolar 20
20. od isolation device The active period of the superspring is nominally about 60 seconds 2 1 3 2 Operation using the SIM ZERO is used to automatically position the superspring corner cube in the center of the detector range With the Superspring travel lock disengaged monitor the SPHERE position using a voltmeter Once the voltage has settled down to a few 10s of mV enable ZERO The spring should come to within approximately 20 mV of zero SERVO is used to enable the servo circuit on the superspring The two functions are mutually exclusive one cannot zero the spring while the servo is enabled and vice versa Once the spring has settle down near the zero position enable SERVO There are two BNC outputs in the Superspring controller SPHERE is a voltage proportional to the location of the superspring corner cube Ideally this is within 100mV or so of zero COIL is a voltage proportional to the current being applied to the coil magnet mechanism Ideally after the spring has come to equilibrium this is constant at zero See the FG5 manual for details 2 1 4 The System Leveling Controller The leveling portion of the SIM is shown in Figure 4 N Micro g LaCoste Tele g Remote Operation User s Manual Figure 4 Auto Leveling Portion of System Interface Module The leveling system is used to monitor and or actively change the tilt of the Superspring tripod The tripod is rigidly coupled to the Superspring and interferometer and thus
21. perspring Control Figure 9 shows the two Superspring windows 15 Micro g LaCoste Tele g Remote Operation User s Manual File View Graph Controller Window Remote Help te S iy E Solutions Inc Super Spring Super Spring Controller Super Spring supe Spring 0 000 Dy Super Spring Contr Super Spring Sphere Position 0 0001 Servo Zero Spring 1 1 1 10 33 13 10 33 18 103923 102328 10 33 32 10 32 38 10 33 43 102348 10 33 52 102 6 Time 5 Remote Disabled NUM A Figure 9 Superspring Control windows in Tele g The large window shows the spring position sphere as a function of time Both the X and Y axes can be adjusted by double clicking on the graph Note that the default is for the Y axis to scale automatically so it is important to make a note of the scale when trying to determine the state of the Superspring The small window is the Superspring controller This also displays the spring position and allows the user to either zero the spring automatically set it at its central position or enable the Superspring servo mechanism Note that it is up to the user to enable the Servo only after the spring has settled down to a few 10s of mV Once the Servo is enabled the Zero function is disabled and vice versa 3 4 Level Control The level control windows are shown in Figure 10 16 Micro g LaCoste Tele g
22. s FIGURE THE OUTPUT PORTION OF THE SIM THIS PROVIDES AN OUTPUT OF THE ANALOG FRINGE SIGNAL AND CONNECTIONS AN OPTIONAL ML 1 5 FIGURE 2 DROPPER CONTROLLER SECTION OF THE SYSTEM INTERFACE MODULE 6 FIGURE 3 SUPERSPRING PORTION OF THE SYSTEM INTERFACE 8 FIGURE 4 AUTO LEVELING PORTION OF SYSTEM INTERFACE 10 FIGURE 5 THE TELE G AND SOFTWARE 11 FIGURE 6 SUPERSPRING AUTO LEVELING 88 12 FIGURE 7 SUPERSPRING TRIPOD DURING ASSEMBLY THE Y LEG IS SHOWN WITHOUT THE FOOT BEFORE SNAPPING THE FEET IN PLACE IT IS NECESSARY TO INSERT AND TIGHTEN THE LOCK NUTS SHOWN IN PURPLE tacos 13 FIGURE 8 INITIALIZATION SCREEN IN 15 FIGURE 9 SUPERSPRING CONTROL WINDOWS 0 08 16 FIGURE 10 LEVEL CONTROL WINDOWS IN TELE G THE RED CURVE SHOWS THE TILT ABOUT THE X AXIS AND THE BLUE CURVE SHOWS THE TILT ABOUT THE 17 FIGURE 11 DROPPER CONTROLLER WINDOW IN 18 FIGURE 12 A2D SETUP SCREEN IN 19 FIGURE 13 DISPLAY WITH TELE G RUNNING ON A REMOTE COMPUTER 21 FIGURE 14 SSH SETUP FOR CONNECTING THROUGH A FIREWALL 23 FIGURE
23. the SIM Default mode of the dropper controller at power up is RESET When in RESET mode the dropper cannot be made to either oscillate lift or drop Pressing RESET at any time will immediately drop the cart to the bottom of its travel Pressing DROP will put the dropper in drop mode In this mode pressing TRIG will e Cart at the bottom TRIG will lift the cart to the top of its travel e Cart at the top TRIG will initiate the drop sequence in which the cart places the test mass in freefall and then gracefully catches it at the bottom The dropper should be in DROP mode for data acquisition Again the CART POS LEDs will indicated the position of the cart There are three BNC outputs for the Dropper Controller TRIG OUT sends out a logic pulse when the drop has been initiated This is normally used to trigger the Time Interval Analyzer card in the system controller computer OBJECT POS can be used to read out the position of the test mass relative to the cart As the distance increases during the freefall portion of the drop the voltage output increases CART POS can be used to read out the position of the cart relative to the dropping chamber N 2 1 3 The Superspring Controller The Superspring Controller section of the SIM is shown in Figure 3 Micro g LaCoste Tele g Remote Operation User s Manual SUPER SPRING SERVO ZERO SPHERE Figure 3 Superspring Portion of the System Interface Module 2 1 3 1 Theory of Operation
24. tol 11 222 333 444 0 Micro g LaCoste Tele g Remote Operation User s Manual After entering the password successfully the desktop of the gravity meter system controller can be accessed At this point it is equivalent to running the system controller at the gravity meter location Tele g can be used to monitor and change system oe 99 settings and g can be run normally to acquire gravity data 4 3 SSH Secure Shell for Connections through Firewalls A problem with the above scenario is that many gravity meters are setup in laboratories that have internet access through a network firewall and remote access to the local IP address is impossible In this case it is possible to use the third part software Secure Shell SSH to tunnel through the firewall Note that this is not hacking per se It is assumed that you have permission to do the following Note also that the firewall computer has to be running an SSH server and you have to have a user account on it Most unix firewalls run SSH by default Finally note that if the local machine is behind a firewall of its own none of these instructions change Setting the system up is perhaps a little confusing and is best illustrated through an example Again this is only necessary for accessing machines that are behind firewalls If your system has a public IP address the following steps are unnecessary Let s assume that the remote computer RR gravity meter
25. ut portion of the SIM is displayed in Figure 1 6 Solutions Inc OUTPUTS FRINGES LASER MODE LASER LOCK Figure 1 The Output Portion of the SIM This provides an output of the analog fringe signal and connections to an optional ML 1 laser Fringes provides an output of the analog signal measured at the photo detector in the interferometer This is identical to Analog on the actual interferometer By placing the N dropper in OSC mode see Section Error Reference source not found for discussion of the dropper controller the fringe amplitude can be measured here See the 5 Operator 5 Manual for discussion of fringe optimization Micro g LaCoste Tele g Remote Operation User s Manual The laser mode and lock are for communication with an optional ML 1 HeNe laser See ML 1 Manual for details 2 1 2 The Dropper Controller The dropper controller portion of the SIM is displayed in Figure 2 DROPPER asc DROP OB i CTPOS Figure 2 Dropper Controller Section of the System Interface Module 2 1 2 1 Theory of Operation The dropper controller uses two modes to operate the dropping chamber These modes are OSC and DROP The operator controls the status of these modes and also the dropper triggering with the RESET and TRIG switches In DROP mode the dropper controller directs the motor in the Dropping Chamber to lift the cart and test mass to a specified height to move the
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