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Geometrics, Inc

.

G-856AX Operation Manual

11

a

b

Figure 10 Removing standard sensor cable from top sensor.

Note: Geometrics recommends using non-magnetic tools for this task and it is

important to use the original brass nuts and washers supplied with the instrument as

substitutes could be contaminated with ferrous material.

2) Attach one of the thinner gradiometer sensor cables to the top sensor as shown

in Figure 11 using the stud nuts washers and clamp that secured the standard
cable.

Figure 11. Top sensor with gradiometer cable attached.

3) As shown in Figure 12, attach the other gradiometer sensor cable to the

bottom sensor in the same manner used on the top sensor.

Figure 12. Bottom sensor with gradiometer cable attached.

Содержание Memory-Mag G-856AX

Страница 1: ...ton Precession Magnetometer P N 18101 02 Rev E Operation Manual GEOMETRICS INC 2190 Fortune Drive San Jose CA 95131 Phone 408 954 0522 Fax 408 954 0902 Email sales mail geometrics com Web www geometri...

Страница 2: ......

Страница 3: ...nal clock 17 3 Setting the Line Number Marker 18 4 Manual Tuning of the Magnetometer 19 5 Automatic tuning 21 6 Acquiring and storing a magnetic field reading 22 7 Recalling measurements from memory 2...

Страница 4: ...ure 7 G 856 shoulder harness 9 Figure 8 Assembled magnetometer 9 Figure 9 Location of Read key on magnetometer console 10 Figure 10 Gradiometer components 10 Figure 11 Removing standard sensor cable f...

Страница 5: ...Operation Manual v List of Tables Table 1 An example of the console memory stack 23 Table 2 Battery endurance comparison 36 Table 3 RS 232 cable connector pin assignment 43 Table 4 Summary of programm...

Страница 6: ...Geometrics Inc G 856AX Operation Manual vi...

Страница 7: ...etometer applications Most rocks contain some magnetite hematite or other magnetic material and will produce disturbances in the local magnetic field Because of this most soils and many man made objec...

Страница 8: ...data from the magnetic survey Software Programs are available from Geometrics to help the user process and interpret survey data These programs include MagMap2000 and MagPick and are available for dow...

Страница 9: ...re that it will work properly anywhere in the world Above all the G 856AX is a high precision magnetometer the result of many years experience in the manufacture of similar instruments The operation o...

Страница 10: ......

Страница 11: ...id level by the degree of sloshing A more accurate level check requires removal of the sensor s fill plug and visual inspection of the contents If the sensor is empty or needs filling proceed as follo...

Страница 12: ...ard G 856AX comes packed in a durable plastic carrying case with compartments for its accessories It contains G 856AX console Sensor Sensor signal cable Aluminum staff four 4 mating sections Console c...

Страница 13: ...air space above the fluid needed for thermal expansion see instructions on sensor fluids in this section for details Figure 3 shows the location of the sensor fluid fill port and the mounting points o...

Страница 14: ...er before proceeding Clasps securing console case a Slide consol cover off to access batteries b Velcro straps securing batteries c Figure 5 Console battery compartment 5 The magnetometer is shipped w...

Страница 15: ...ady for 3 4 seconds before taking a reading Figure 7a shows the completed assemble ready for measurement Figure 7b shows an alternate method for carrying the staff with the sensor with its central axi...

Страница 16: ...optional set of accessories These items are shown in Figure 9 and include Gradiometer sensor Lower staff adapter Upper staff adapter Gradiometer sensor cable Gradiometer Switch Velcro attachment pack...

Страница 17: ...as substitutes could be contaminated with ferrous material 2 Attach one of the thinner gradiometer sensor cables to the top sensor as shown in Figure 11 using the stud nuts washers and clamp that sec...

Страница 18: ...t Note that Figure 14a shows only one staff section separating the sensors Normally two staff sections will support the bottom sensor so that the top sensor is at 8 ft and the lower sensor at 4 ft An...

Страница 19: ...uld also be mounted on a stable structure in order to minimize wind induced motion of the sensor Geometrics provides a base station kit that can be used with the G 856AX staff sections to construct a...

Страница 20: ...world Horizontal and vertical mounting is also accommodated on the gradiometer sensor When making a measurement the correct sensor orientation will be determined by the Earth s magnetic field inclinat...

Страница 21: ...on the other hand the staff is held horizontally during measurement the mounting points should be reversed That is the sensor should be attached at the saddle mount in regions of high inclination and...

Страница 22: ...surement of the magnetic field FIELD Used during memory recall to recover the field reading after TIME has been depressed TIME Accesses the real time clock Also displays the time at which readings wer...

Страница 23: ...aps on it sides and slide the cover off of the console Verify that the batteries are correctly oriented D cells or that they are connected rechargeable Gel cells Reinstall the console cover 5 Attach t...

Страница 24: ...isplay will automatically go blank 5 seconds after pressing TIME If you decide that you need to reset the clock choose a time in the near future when you plan to start the G 856AX clock Then proceed w...

Страница 25: ...order to provide its amplifier circuits with the greatest signal strength and thereby provide the best sensitivity The tuning procedure is a matter of matching the console s internal tuning frequency...

Страница 26: ...signal strength as indicated under SIG Approximate tuning will be adequate for most surveys but the G 856AX does allow you to tune the magnetometer very precisely the magnetometer may be tuned to 3 di...

Страница 27: ...of the field Signal strength levels of 6 to 10 are typical and should provide consistent measurement results 5 Automatic tuning The G 856AX can be set to tune itself automatically When the automatic t...

Страница 28: ...ays will light briefly showing the battery voltage For example batt FIELD TIME 11 7 STATION DAY 2 Then the battery voltage will turn off after a short interval and the FIELD TIME display will light wi...

Страница 29: ...9 12 32 55 10 68645 5 008 12 32 30 10 68857 4 007 12 32 00 10 68682 9 006 12 32 54 10 68432 8 005 12 32 20 10 68845 7 004 12 31 59 10 68723 8 003 12 31 37 10 68245 6 002 12 31 02 10 68290 0 001 12 30...

Страница 30: ...second half of the memory line you can still decrement or increment by depressing RECALL or ENTER You can also view the field measurement and station number by pressing the FIELD key while the displa...

Страница 31: ...eadings automatically at a specified time interval When the magnetometer is set up for automatic reading it is usually stationary operating at a fixed location as a base station The purpose of base st...

Страница 32: ...ere will be a slight delayed action when commands are keyed This is because the console processor will be busy taking readings and displaying the results You may find that you will need to hold down t...

Страница 33: ...r the transfer process If you need to stop the transfer process before it has completed press CLEAR This will halt the data process but the data will remain in G 856AX memory until it is erased as des...

Страница 34: ......

Страница 35: ...ries by less than 1 nT you should expect less than 1 nT variation in repeatability That is changes in position by as much as 30 or 40 cm should not produce measurements that vary by as much as 1 nT Un...

Страница 36: ...in the following manner 1 Mount the sensor on its staff place the suspected article far away from the sensor and take several measurements Each measurement should repeat to 1 nT 2 Now place the suspe...

Страница 37: ...ne to the next MagMap2000 will be able to locate the measurement points correctly For greatest measurement accuracy it is best to orient the sensor in the same direction at each station when acquiring...

Страница 38: ...one sensor and then a reading is obtained from the other sensor These two readings are separated by approximately three seconds and it is important to hold the gradiometer staff steady during measurem...

Страница 39: ...e case you will need to connect an adapter e g a USB serial port converter We recommend that you use the MagMap2000 software supplied with the magnetometer to facilitate data retrieval and processing...

Страница 40: ...that appears The Flags discussed in item 4 above are also reproduced on the 2 D and 3 D map data plots 6 Survey results can be exported as a file in ASCII Text format for processing or plotting using...

Страница 41: ...wing the battery voltage This number is the actual battery voltage present under load That is the battery voltage is measured during the polarize cycle of the magnetometer When operating from internal...

Страница 42: ...is used as a survey instrument and is configured for operation from D cells we recommend using cardboard or plastic jacketed batteries If steel jacketed batteries carbon zinc or alkaline are used in t...

Страница 43: ...or exposure to below freezing temperatures while in a deeply discharged state Leaving them under charge for an extended period cannot damage the Gel cell battery packs When the system is not in use w...

Страница 44: ...lder the lead wires to the pads Trim off any extra wire Connection is made with wires running through the center of the board 9 Replace the circuit boards cables screws and cover 10 Install the operat...

Страница 45: ...d fill port have tapered threads designed to form a tight seal Tighten the plug just enough to prevent leakage over tightening may damage the sensor housing 7 Sensor is now ready for use The different...

Страница 46: ......

Страница 47: ...Geometrics Inc G 856AX Operation Manual 41 Appendix Magnetic field inclination degrees Magnetic field intensity variation nT...

Страница 48: ...y still Try shortened count 3 Magnetic objects on operator 3 Remove iron objects from pockets belt etc 4 Magnetic dirt on sensor 4 Scrub or scrape magnetic particles off sensor 5 Review causes under f...

Страница 49: ...ls and protocol for interfacing data terminal and data communications equipment that uses serial binary interchange The latest revision to this standard has been in effect since 1969 and is referred t...

Страница 50: ...lear to send H Battery positive Connected to Internal Battery J Data 0 Serial BCD is no longer used K Data 1 Character L Data 2 Serial M Data 3 BCD out N Data valid P End of data R Instrument power Ex...

Страница 51: ...xternal power supply can be a source of interference if it is not well regulated and this may reduce signal quality To operation from external power connect the positive terminal of the external sourc...

Страница 52: ...e is started External SYNC may be momentary or many be held low indefinitely If it is held low momentarily polarization current will shut off at the normal time If SYNC is sustained then the polarizat...

Страница 53: ...ining a magnetic field measurement using a proton precession sensor During the first stage polarize cycle a current is fed to the sensor coil This coil is immersed in sensor fluid and the current flow...

Страница 54: ...n precession magnetometers do not operate well especially those models optimized for higher latitudes In these areas the precession signal may be small and decay beyond detectability before the end of...

Страница 55: ...face will receive at 110 baud A standard telephone line with a modem will communicate at 300 baud or higher Printers with RS 232 interfaces may handle 300 baud and higher Computers can accommodate dat...

Страница 56: ...ility of 5 seconds per month at room temperature and 5 seconds per day over the temperature range of 20 to 50 degrees Celsius Tuning Push button tuning from keyboard with current value displayed on re...

Страница 57: ...cm 4 LB 1 8 kg o Staff 1 inch x 8 feet 3cm x 2 5m 2 LB 1kg Environmental Meets specifications from 1 to 40 C Operates satisfactorily from 20 to 50 C Power Depending on version operates from internal...

Страница 58: ...for a particular purpose and of all other obligations or liability on the part of Geometrics and Geometrics neither assumes nor authorizes any person to assume for it any other liability Geometrics s...

Страница 59: ...RTANT Please explain why this instrument or part is being returned include a complete description of any malfunction use additional paper if necessary SHIP TO Geometrics Inc 2190 Fortune Drive San Jos...

Страница 60: ...5 ENV 50140 1994 ENV 50141 1994 EN 61000 4 2 1995 EN 61000 444 1995 per the provision of the Electromagnetic Compatibility Directive 89 336 EEC of May 1989 as Amended by 92 31 EEC of 28 April 1992 and...

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