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G–877 MARINE MAGNETOMETER OPERATION MANUAL

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Summary of Contents for G-877

Page 1: ...MAGNETOMETER 25165 OM Rev B Operation Manual COPYRIGHT January 2001 GEOMETRICS INC 2190 Fortune Drive San Jose CA 95131 USA Phone 408 954 0522 Fax 408 954 0902 Eml sales geometrics com Eml support ge...

Page 2: ...2 G 877 MARINE MAGNETOMETER OPERATION MANUAL...

Page 3: ...FIGURING MAGNETOMETER HARDWARE 22 MAGNETOMETER CALIBRATION 24 REAL TIME LAY BACK CALCULATIONS 25 DATA DISPLAY CONFIGURATION 28 CONFIGURING PRINTER 30 FINISHING SETUP 31 4 0 APPENDIX A 33 2 2 1 Quick S...

Page 4: ...4 G 877 MARINE MAGNETOMETER OPERATION MANUAL...

Page 5: ...re sometimes supplied with the system it is important that you read the MagLogNT manual as well as section 3 0 in this manual on the use of the MagLog Configuration Wizard If you are not using our sof...

Page 6: ...0 000 gammas nT Magnetometers can be hand carried vehicle mounted fixed as base stations or operated aboard aircraft marine vessels or even spacecraft Data collected from magnetometers can be used to...

Page 7: ...lign themselves with the earth s field but because of their inherent spin precess like a spinning top As they precess the protons behave like tiny magnets inside the sensor coil inducing a small AC si...

Page 8: ...NOTES 8 G 877 MARINE MAGNETOMETER OPERATION MANUAL...

Page 9: ...C input cable provides for operation from a 24 32 volt DC source such as 2 car batteries wired in series Software to log and display digital magnetic data is available from Geometrics and may be inclu...

Page 10: ...electronics module is internal to the fish body This module produces the polarize signal to the sensor reads the precession frequency and converts it to RS 232 for transmission up the tow cable The t...

Page 11: ...MAGNETOMETER ELECTRONICS INSIDE SACRIFICIAL ANODE SENSOR G 877 CLEVIS TOW CABLE G 877 MARINE MAGNETOMETER OPERATION MANUAL 11...

Page 12: ...nt An On Off switch applies power to the magnetometer If the DC power cable is connected to reversed DC power the LED will light Red Normal operation is with the Green light lit It is imperative that...

Page 13: ...sh As shipped the tow cable should already be connected to the magnetometer fish If the tow cable is not connected to the fish or there is need to disconnect it see Appendix B for instructions For tes...

Page 14: ...CTORS ARE DRY AND SALT FREE USE A SMALL AMOUNT THE SUPPLIED SILICONE GREASE LUBRICANT OR SPRAY ON ALL MALE CONNECTOR PINS BEFORE ATTEMPTING TO MATE THEM DO NOT PACK THE FEMALE RECEPTACLES WITH GREASE...

Page 15: ...UP A SURVEY Configure the logging software in the following section as described Make sure that the magnetometer and GPS are powered up and sending data during the configuration It is important that y...

Page 16: ...cations Manual for Portable Magnetometers Enjoy your new search and survey tool Contact the factory by email or fax or phone with any comments or questions support mail geometrics com or sales geometr...

Page 17: ...NOTES G 877 MARINE MAGNETOMETER OPERATION MANUAL 17...

Page 18: ...upported are o G 880 881 magnetometers with up to two magnetic sensors and optional pressure transducer and altimeter o G 886 G877 family Other devices for logging and display may be configured manual...

Page 19: ...same folder where maglog exe executable files reside but in another folder such as C DATA SURVEY1 Please note that the new file name should not previously exist in the folder MagLog will not overwrite...

Page 20: ...ions is not met an Alarm Window with a warning appears on the screen A note on real time lay back calculations MagLog provides a feature that calculates where the fish is at all times It does this by...

Page 21: ...allows user to set all these parameters It is assumed that user map if any is presented in MagLog format already and user can simply import it up If map has not yet been transformed into Maglog forma...

Page 22: ...baud rate are set correctly the magnetometer will be found very quickly Next set Hardware Type The following configurations are available 1 1 880 881 823 mag system This system consists of one magneti...

Page 23: ...ignal depth altitude and the same 4 values for second sensors Depth and attitude sensors have to be calibrated 7 886 877 Proton Magnetometer This device may have additional channels depth and they are...

Page 24: ...dialog boxes but we recommend that you use the Wizard only when all devices to be logged are connected and sending data The communication program may fail due to other reasons as well such as a wrong...

Page 25: ...ort because the final data will be logged in a format ready to be loaded into many popular programs like Surfer for example with the position of the fish not the boat in the file In order to use this...

Page 26: ...figurations for multiple sensors Note the gradiometer applications are many and varied primarily associated with wider swath of coverage or removal of the diurnal field variations Contact Geometrics f...

Page 27: ...ally measured on the vessel and entered The final Interpolator Configuration screen presents the layout of interpolator log file This file consists of many columns and includes magnetic field signal d...

Page 28: ...e from the following display configurations Horizontal landscape or vertical graph orientation Color of the traces Color of coordinate grid Annotation text font and color Window background color Depen...

Page 29: ...s have fixed values if value to be plotted is out of this range the curve simply disappear from the screen Depth also can be plotted in either mode If there are depth and altimeter sensors MagLog make...

Page 30: ...n select the correct printer type Note that if the printer type is incorrectly selected unrecognizable characters will be printed You also can configure the following printer options Select chart spee...

Page 31: ...input to data file input demo mode MagLog creates two windows a magnetometer display window and a GPS view window and tiles them on the screen The GPS window initially has the minimum possible magnif...

Page 32: ...NOTES 32 G 877 MARINE MAGNETOMETER OPERATION MANUAL...

Page 33: ...elsewhere in this manual It should be noted that the following information is not required for MagLogLite or MagLogNT users and is supplied for developers of their own logging systems or for third par...

Page 34: ...is a measurement of system Noise see paragraph 3 4 Pol OFF This is accomplished by typing P255 Enter on the Control and Display Computer The Noise amplitude should be approximately in the range 10 to...

Page 35: ...d to log GPS will have minimal usefulness If MagLogLite logging software was purchased follow the instructions in the MagLogLite logging software manual to install the MagLogLite software Windows Hype...

Page 36: ...correctly and save them before you can run In many cases pressing a character will cause a list of items to be sent and or set before returning the prompt A few moments may be required before you get...

Page 37: ...ng will cause the initiation of the process of defining the format of the data string that is transmitted by the Magnetometer Each paragraph below represents a data item that may be included in the da...

Page 38: ...these parts of the firmware Password Gate time as percent of cycle time 50 0 Maximum gate time in seconds 0 5 Maximum pol time 5 0 auto tuning search increment in Kgammas 2 0 Bad readings before auto...

Page 39: ...ms initializing the system do the following 1 Turn leave the power off to the magnetometer 2 Press the CAPS LOCK to select all upper case letters to be output to the Magnetometer 3 Hold the Q key to r...

Page 40: ...displayed This string marks the start of the line of text that is the data so that the manual tuning information does not get confused with the data After the preamble comes the data item selected by...

Page 41: ...onics process To help the user in properly programming the magnetometer operation we offer these descriptions Specific questions should be addressed to Geometrics Customer Service 1 Invalid character...

Page 42: ...before it If you have a variable specified to print in the fourth position you also must have ones in the first second and third positions 10 is a nonstandard BAUD rate If you enter a number such as 1...

Page 43: ...e and sensor A Abandon Changes E Everything Q Quit abandon changes S Save parameters C Cycle time F Format of output R Run magnetometer D Display all parameters N Next for multi sensor arrays A messag...

Page 44: ...em need to be reset and saved Download latest operational software from our Website regularly MagLogLite and MagMap2000 Please refer any comments questions or technical support issues to Customer Serv...

Page 45: ...reverse order To connect the tow cable clevis assembly to the magnetometer fish begin by arraying the parts as show in the picture below MAGNETOMETER FISH NOSE CLEVIS PIN AND COTTER PIN CLEVIS ON THE...

Page 46: ...hole in the side of the seawater electrode It must be oriented as shown towards the nose or you will be unable to mount the nose later Place the single pin watertight connector onto the single pin co...

Page 47: ...d to slide it as far inside the fish as possible approximately four inches It will reach a stop Next slide the seawater electrode into the fish until the hole in the electrode aligns with the second h...

Page 48: ...rificial anode saddle a one inch brass screw and the brass locking nut Assemble them together with the flat side of the anode against the flat side of the saddle and the brass screw through the right...

Page 49: ...g a 7 16 open end wrench hold the nut and finish tightening the screw Remove the left hand screw Push the tow cable and ground wire into the cavity in the fish and then insert the nose Wile inserting...

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