doc. ref. · 2018. 5. 10. · autograv model. the meter has many advantages over existing meters in...
TRANSCRIPT
•000
SCINTREX5~9001
A REPORT ON
GRAVITY CHECK SURVEY OVER RMIP ANOMALIES
ON THE BOCO SIDING AREA
WITHIN E.L. 17/88. QUE RIVER. TASMANIA
ON BEHALF OF
SAM ISEN PTY. LTD.
Doc. Ref.
MINES
•
001
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•
SCINTREX
PRIVATE AND CONFIDENTIAL
A REPORT ON
GRAVITY CHECK SURVEY OVER RMIP ANOMALIES
ON THE BOCO SIDING AREA
WITHIN E.L. 17/88. QUE RIVER, TASMANIAON BEHALF OF
SAMISEN PTY. LTD .
BY
A.W. HOWLAND-ROSE
MSc,DIC,FIMM,FAusIMM,FAIG,FGS,CEng.
GEOPHYSICIST
SYDNEY, N.S.W .
589002
SEPTEMBER, 1989
TAS-126
'.
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SCINTREX
CONTENTS
Summary
Introduction
Equipment
Data Presentation
Discussion of Results
Conclusions
Data Profiles
RPS contour plan showing location of gradient traverse3
589003
Page 1
Page 2
Page 3
Page 4
Page 7
•589004
SCINTREX PTY. LTD.(;,f:OPHVSICAL CONSULTANTS .... ND <:..:01\011 RAC.TQRS
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SlJJ'II'IAR(f
f1 ;,eA-liz;, 01- I-.ive (!Al'.M u:h.vuz. .induced polan..izaLion anoma.L.ieA ,<!l'.J1£ depne.d,
Wl'./1R. ;,elede.d 1-01/. dda.i1in.g wdh a gl/.avily ;'Ul/.uey.
On1.y one. 01- the. RJ'S anofTlJ:Llie./> de/-.ine.d ljL the. Te£./wall.Y-('lall.ch. /11'111' ;'Ul/.vey
;,howe.d h.ighell. Man £nckg/l..,wui mM;' ;'Ul/.phM, and the.n not to a />ul-I-.ic.imtfy
h.igh de.g/l£e to iI£ judged ;,.ign-ipcani•
'031 WELLINGTON STREET,WEST PERTH. 6005WESTERN AUSTRALIA
TELEPHONE: (09) 321 6934TELEX 92353
FACSIMILE: (Og) 481 1201
6 TRAMORE PLACE,KILLARNEY HEIGHTS, 2087N.S.W. AUSTRALIA
TELEPHONE: (02) 451 5367TELEX: 26859
FACSIMILE: (02) 451 4670
'NCORPORATED IN W,A.
•"",... d
UU'l
SCINTREX
INTRODUCTION
589005
Page - one
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Following an RMIP survey carried out by Scintrex Pty. Ltd. in the Boca
Siding area of EL 17/88 between 15th February and 13th March, 1989, and
described in a report by the author dated May, 1989, Scintrex Pty. Ltd.
carried out a series of short gravity traverses over selected RMIP
anomalies.
The work was requested by MR. I. Shulman, Chairman of Samisen Pty. Ltd., and
carried out by Mr. P. Brown,BSc, and Mr. M. Joint,BSc, over 5f production
days between 20th July and 5th August, 1989. The author visited the site
during the survey .
•00:'
SCINTREX
EQUIPMENT
589006
Page - two
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The gravity meter employed was the Scintrex CG-3 microprocessor based IGS
autograv model. The meter has many advantages over existing meters in the
button grass plains environment of the Boco Siding, not least of which was
the electronic tilt sensor feature, and being able to be remote from the
meter during reading time, thus reducing problems generated by the meter
settling in the soft ground. A specification sheet is appended.
Levels were read only locally along the line using a Fuji T-202 theodolite
and staff with no attempt being made to tie in the stations to one another .
•006
SCINTREX
DATA PRESENTATION
589007
Page - three
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The Bouguer gravity data is presented in profile form in absolute units
using a density correction factor of 1.8.
The elevation, together with the MMR and RPS data are also shown on the same
profile .
•OOi
SCINTREX
DISCUSSION OF RESULTS
589008
Page - four
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While some seven zones of internal polarization were defined over the
section of the grid surveyed, the associated MMR data showed that the
sources had little resistive contrast with the enclosing rocks. Ideally the
massive copper (lead-zinc) or lead-zinc lenses sought would be expected to
show strong and weak conduction relative to the enclosing rocks.
Nevertheless six of the anomalies showing internal polarization were
selected for detailing, plus one area in the southern section of the RMIP
survey grid which showed strong conduction but weak polarization.
Each section surveyed is separately discussed below.
Lines 4500N 3600E to 4000E
4600N 3600E to 4000E
This section of the grid was characterised by a broad moderate MMR response
of up to +60% with some sharp relatively high RPS peaks to +0.5° RPS.
The gravity data shows a broad low of approximately one milligal which
mirrors the MMR data.
Conclusion It would appear that the anomaly on the RMIP survey was due to
polarization within a rock unit less resistive than the enclosing rocks.
Pyritic and/or graphitic shales are the suggested source.
Line 4600N 3300E to 3700E
A series of low amplitude internal polarization anomalies +0.5° RPS relative
to background at 3425E, 3475E and 3575E showed no response in the MMR data.
The gravity data over this section shows no significant response over these
minor anomalies .
•008
SCINTREX
589009
Page - five
Conclusion The source is disseminated sulphides (and/or graphite) within a
rock unit showing no resistive contrast with the enclosing rocks.
Lines 5 lOON
5000N
3400E to 3800E
3400E to 3800E
•
A series of +0.5° to +0. r RPS responses from a flat section of MMR were
interpreted to be due to disseminated sulphides and/or graphite from within
a uniform sequence of rocks.
The gravity data shows no specific significant responses associated with
these maxima.
Conclusion The RPS features observed are due to minor disseminated
sulphides (and/or graphite), probably of 'formational' origin •
Line 5600N 3400E to 4000E
Two significant groups of internal polarization responses were recorded
+l.loRPS at 3450E and +0.5° at 3525E and to the east up to 1!0 RPS at 3800E.
The MMR da ta over these responses is essentially featureless, implying
either a disseminated source, or if massive, electrically discontinuous.
The gravity data similarly shows only minor increases (after allowing for
the gradient in the field).
Conclusions The RPS anomalies defined are due to a disseminated s,)urce
•
(sulphides and/or graphite) within rocks having little ;cesistive contrast
with the enclosing rocks .
•OOi;
SCINTREX
589010
Page - six
Lines 6100N
6000N
2975E to 3500E
2975E to 3550E
The best RMIP response was recorded on line 6000N centred at 3175£ with
subsidiary maxima at 3225£ and 3325£. While this was accompanied by a
depression in the MMR from a local background of about zero to -30%,
indicating a resistive host, the magnitude of the RPS anomaly was considered
worthy of further investigation.
The gravity data on line 6100N showed a local increase of 0.6 milligals with
individual maxima in the gravity data tending to coincide with individual
RPS maxima.
anomaly, the magnitude thereof
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Conclusion While sulphides almost certainly contribute to
does not warrant further work.
the gravity
•010
SCINTREX
CONCLUSIONS
589011
Page - seven
The RMIP survey carried out over a section of EL 17/88 in the Boco Siding
area, yielded a series of polarization sources which are interpreted as
being due to disseminated (formational ?) sulphides and/or graphite.
The gravity survey carried out showed only a weak to moderate anomaly of 0.6
milligals (±) over the sections of lines 6000N and 6100N centred at 3175E
±50 metres and east and west thereof. However, this is not considered to
have economic potential.
•Respectfully submitted on
SCINTREX PTY ~ LTD. /'
•
A.W. Howland-Rose,MSc,DIC,FIMM,FAusIMM,FAIG,FGS,CEng.
Geophysicist
589012
How the Autogravs microprocessor-based automation contributes to ease ofoperation and high accuracy in gravity surveying:
• ~ Reading resolution of 0.01 mGal
• Worldwide range withoutresetting
• Repeatability of 0.01 mGal
• Measures at the simple press ofa key
• Samples each second, stacks,calculates standard deviationsand rejects spurious values
" Records in solid state memory
'I Outputs to a printer or computer
~ No need to pack and unpackbetween stations
012
•Brief Description
The New Scintrex Autograv is amicroprocessor-based, automatedgravity meter with numerousrevolutionary features. The CG·3Autograv provides the essentials of afull worldwide range of 7000 mGa/~
without the need for resetting,combined with a measurementresolution of 0.01 mGal. Operator erroris reduced through the automatictaking of readings which arecontinuously sampled for real timesignal enhancement and statisticalanalysis. This ensures accuratereadings which the Autograv thenautomatically corrects for earth tidesand tilt errors. These readings arethen stored in solid-state memory forlater outputting to a printer, modem ormicrocomputer. All o( this capabilitycomes in a rugged, compact transitcase which wiJI slide convenientlyunder an aircraft seat.
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The sensing element of this GravityMeter is based on a fused quartz elasticsystem which takes full advantage at theremarkable elastic properties andstrength of this material. The gravitalianalforce on the proof-mass is balanced by aspring and a relatively small electrostaticrestoring force. A change in gravIty altersthe position of the mass which is sensedby a capacitive displacement transducer.An automatic feedback circuit applies DCvoltages to the capacitor plates producingan electrostatic force on the mass whichbrings it back to a null position. Thefeedback voltage, which is a measure ofthe relative value of gravity at the readingsite. is converted to a digital sIgnal andthen transmitted to the instrument's dataacquisition system for processing, displayand storage.
The parameters of the CG-3 gravitysensor and its electronic circuits arechosen so that the feedback voltagecovers a range of over 7,000 mGalswithout resetting. The use of low noiseelectronic design together with a highlyaccurate autocalibrating analog-to-digItalconverter results in a resolution of 0.01mGal. enabling the gravity meter to beused for both detailed field investigationsand large scale regional or geodeticsurveys.
One of the convenient new features of lheAutograv design is its electronic tiltsensors which provide greater accuracythan conventional bubble levels. The
589013
outputs from Ihe sensors are displayedon high resolution meters on theinstrument front panel and alsotransmitted to the data acquisition systemfor storage and digital display.
Protection from ambient temperaturechanges is provided by locating thequartz elastic system, theanalog-to-digital converter, sensitlveelectronic components and the tiltsensors inside a high stabilIty, two-stage.thermostatically-controlled environment.In addition. the entire gravity sensingmechanism is enclosed in a sealedvacuum chamber, isolating it fromvariations in atmospheric pressure. Theinstrument is inherently free from errorsdue to magnelic field variations as Ihesensor is made from non-magnetic fusedquartz.
The Autograv is very Simple to operate,requiring only a few keystrokes to take ameasurement, store data in thesolid-state memory and advance thestation coordinates. Information is clearlydisplayed on a 32 character LCD dispiay.The stored data can be output to aprinter, modem, cassette recorder ormicrocomputer.
The packaging represents anotherinnovation which makes operation easier.The integrated housing doubles as acarrying case, eliminating the need furunpacking and packing the sensor ateach station. The lack of a cableconnecting the sensor and balleryminimizes accidental upsets.
AUIOQrav pnnclple of operation
Scintrex can supply sollware for use on amicrocomputer. These fully documented,easy to use programs Will correct,process. grid and plot your gravity data.
A gravity meter capability identical to thatof the CG-3 is available by selectingInstrumentation from the Scintrex IGSIntegrated Portable GeophySical System.Details regardmg the IGS-2iCG-4Autograv Automated Gravity Meierconfiguralion and its additional featuresare provided later in lhis brochure. Interms of use for gravity measurements allspecifications of the CG-3 are also melby the IGS-2iCG-4_
013
•Features
589014
SCINTREX
Aulograll .Automated Gravity Meter
Worldwide coverage with 0.01 mGalresolution. The CG-3 combines ameasuremenl range of over 7,000 mGalswithout reselling and a reading resolutionof 0.01 mGa!. These two features enablethe gravity meter to be used for detailedlocal invesllgations, comprehensiveregional surveys or large scale geodeticstudies.
Accurate, automatic measurements.With the fully aulomatcd capabilities ofthe Autograv, reading errors common toother older gravity meters due to opticalparallax, operator judgement andmechanical design, are eliminated.Accurate measurements are taken bysimply pressing a key. The measurement,along with other survey information, isstored in fail-safe, solid-stale memory forlater retrieval. As noise reduction isaccomplished by a signal averagingtechnique, measurement time depends
•
on local seismicity. Under most conditionsreading duration is 20 seconds.
It IS not necessary to record everymeasurement Several readings can betaken before one is selected forrecording. Alternatively, more than onevalue can be recorded with identicalcoOrdinates at different times.
Additional information can also beentered at the time of measurement lorrecording In memory. Eight blocks ofdata, each containing up to a five digitsigned number can be recorded.
Accurate calibration. The use of a welldelined gUidance system for theproor-mass allows the gravity meler to beinitially calibrated with an accuracy ofapproximately 0.01 % on a tilt table. Thecalibration curve is linearized in softwareand the output is displayed directly inmGals. The accuracy of the calibration isensured by the use or high stabilityelectronic components and a softwarecontrolled procedure in which theanalog-to-digital converter is calibrated byan internal reference before eachreading.
Before shipment the calibration of each• instrument IS checked on a 120 mGal
test range established and mainlained bythe Geological Survey of Canada.
Low drift. The extremely stable operatingenvironment of the quartz elastic systemallows the long-term drift of the sensor to
be accurately predicted and a real timesoftware correction reduces it to lessthan 0 02 OlGais per doy.
Rugged, robust sensor. The Inherentstrenglh Elnd excellent elJstic properties01 fused quarlz together with limit stopsaround lhe proof-mass permit theinstrurnent (0 be operated without internalclamping. Funher protection IS providedby a durClble shock mount system.
Temperature and pressure control. TheAutograv sensing clement IS sealed In atemperature· stabilized vacuum chamberto protect it from variations in the ambienttemperature and changes In atmosphericpressure The signal from a temperaturesensor In close contact with the elasticsystem IS used 10 make a softwarecorrection for any small residualtemperalure changes
Electronic tilt sensors. Easy-to-readmeters mounted on lOP of the Instrument
x
arc connected to electronic tilt sensorswhich provide greater accuracy, reliabilityand stability than conventional bubblelevels. Leveling can be accomplishedlaster and operalor errors reducedlhrough Ihis feature. Instrument lilt canalso be dIsplayed digitally and, as an aidto data quality control, it is automaticallyrecorded at each station.
Automatic tilt compensation. Usingconstantly updated information suppliedfrom Ihe internal !,It sensors, the Autogravcan automatically compensatemeasurements lor changes in orientation.This operator selectable feature ensuresthat when measurements are taken onunstable ground errors due to instrumentmovement will be automaticallyehminated.
589015
•Features
Automatic tidal corrections. Basedupon geographical location and time zoneinformation entered by the operator, theAutograv will automatically calculate andapply a real lime tidal correction \0 eachreading. This feature is operatorselectable
Solid-state data recording. Headerinformal ion, observed values, stationnumber, Ime number and time for eachobservation are all recorded for eachmeasurement. The standard, internal 16KRAM solid-state memory is large enoughto store up to 420 slat ions. To store moredata, the memory can be expanded in 8KRAM Increments to a maximum of 48K.
A scI of buill-In miniature balteries,charged from the main batteries, willkeep the memory intact for several daysin the event 01 main battery failure.
•
Outputs to many peripheral devices.The RS-232C port with keypadselectable baud rates and carriage returndelays permrt data to be output 10 manycommonly available devices. A digitalprinter can be used to print data aslistings or as profile plots. A modem canbe used to transmit data to head officevia a telephone line, or a magnetic taperecorder can store data for futurecomputer processing.
Data can be output directly Into aportable microcomputer so that dataarchiving on floppy disk, or addItionalprocessing, can be done in the field. Inaddition, several data dumps can bemade sequentially from the memory.
Simple, automatic plots, Only a printeris required to output header inrormationas well as data listings or profile plots inthe field. This immediate, error-freeoutput enhances in-field quality controland saves time and effort compared tomanual data compilation.
When profiles are output onlo a pnnter,any two parameters can be selected forsimultaneous plot printing. Scale factorscan then be selected which greallyenhance the resolution of the data to beplotted as well as a bias value which canbe selected to establish a predeterminedIhreshald lor the plaUing of data. In theprofile display3, the actual stationnumbers and data values are also printednumerrcally.
Statistical parameters. A reading isobtained by continuously averaging aseries of one second samples.. TheSlandard deviation of these samples canbe viewed on the display and used by theoperator to estimate the measurementlime 10 obtain sufficient accuracy. Thestandard deviation is stored in memory.
Noise rejection. Measurementinterterence due to locally inducedshocks and vibrations can be eliminatedon a sample-by-sample basis. Values ofmore than four standard deviations fromthe mean during a measurement areautomatically rejected.
Cycling mode. The cycling mode can beemployed to automatically record a seriesof gravity measurements at a fixed site.
Analog output. A digital-la-analogconverter provides an output for use witha chart recorder. When this feature isused with the cycling mode it proVIdes apseudo·analog record of the gravitymeter output in real time.
Autograv outputs data to complJters
GR(.;VIl"lETER / Cycling Mc.de Rl.mSClt4TREX Vl.6 CG-3Cycl~ TimeJ 58Lin~= 1. Grid:
Timem 1Zl9131Zltl1
Date: 88/~2/~3
0.55485.938-7.76229
1ZJ.2
1.2.
178.6
i75.4
79.61
Uti"
co~E~E~
"•~-~. 183 J:
43.67
Corrected ""
Ber ~Jo:
Ope-rCl.tor:
On-Line Tilt
Tilt y sensitivity:Tjlt K sen~i~ivi-tYJ
Temperature constant:Deg.La-titude:Deg.LongtitudE-t
10.Job:1.
Drift Correction Start
Gravity Reference:Gr~vity constant #1:Gravity constant #2:Dr- i ft constant::Gt"IT Di fference:
Stati on Grav. ER. Tilt " Tilt y Temp. Tide Dur Ii Re.l Time110 • 4232.3<Q 0.010:2 2. -4. -i.69 (Zj.~37 36 0 17m 1 ::; = 110110, 4"'''''',,:) 30 10.10103 2. -4. -1.68 10.037 36 10 17: 16: 1".......'..c;..
110 • 4232.3121 (ZJ.003 2. -4. --1 .69 lli.~37 36 10 17, i 7 t 110 •110 • 4232.3lZJ 0.003 2. -4. -1. 68 121.12137 36 10 17; 18 z 110 ro• 0.037 "10. 4232.30 10.1003 2. -4. -1.68 ...:.'c-... ~i .t 7, 1.9: 110tlO • 4232.30 10.10103 2. -4. -1.69 121.12136 36 10 17~ 2~1 : 110110 • 4232.29 10.003 2. -4. -1.68 (£;.036 '-'6 10 17,21 , 110
Typical Autograv Printout: The header information presenTed at rhe top of each data listing provides a summary of Ihe survey nRramelers andcons/ants used by Ihe instrumenl Eight variables arc recorded at each station.- ') corrected gravity. 2) standard deviation. 3) til! about/he X-axis. 4) filtaboutlhe Y-axis, 5) gravity sensor temperature. 6) tidal correction, 7) duration of measurement and 8) number of relected samples In Rdd/lion. al {11&end ()f each station'S listings is the lime at which Ihe measurement was initialed
013
•Features
•
Power Supply. TI10 Infernal,rechargeable ljatti;~ry provides suffiCientpower 10 operate the instrumentthroughout a norm,ll SIJrvCY day.
Worn inside the operalor's coal duringcold weather operation, the Belt BatteryPack is used to k8ep rechargeablebatteries warm so Ihal their lifetime canbe extended
_ The battery vollage can be checkednytlme on the display and there is an
audible low ballery level alarm. If thebatteries are not replaced or recharged,then the ins1rument will eventually slopmeasuring in order to eliminate thechance 01 corrupted data beingmeasured or recorded.
In audition, the Ins!rumcnl con beoperated rrom any ex!ernClI 12 V DCpower supply 01 battery capable 01supplying 2 amperp.s. A 'c;pcciClI optionalcable facilitales this appllcatlun.
Speaks your language. Your operatorWill lind it very easy to lakemeasurements with the Autograv due tothe fact lhal it can lilerally .speak yourown languEloe, provided you use the Latinalphabel. The rlisplayed messages are inactual words, no! codes or symbolsenabling the 0lJerator to qUickly lemn howto use the instrurnenl in etfl error-Ireemanner.
589016
32 characler LCD display. Messagesand dala are spelled out clearly in twolines of 16 characters each, on a displaywhich is easy to read in either brightsunlight or dim conditions..
Program access lock-out. Once thesurvey parameters have been set, accessto the programming lunction can bebarred, preventing the unintentionalchange of system setup menus duringsurveys.
Real time clock. The buill-In real limeclock shows day. month and year as wellas hour, minute and second, informationwhich is recorded with eachmeasurement. The clock is accurate toone second over 12 hours over the fulloperating range of the instrument. It iseasily reset, if required. Time can beshown on the display, after twokeystrokes.
Integrated instrument housing. Thegravity sensor, solid-slale control systemand battery are integrated into a single,easy-to-use package The base of theAutograv case incorporates a specialtydesigned kinemalic mounting systemwhich indexes onto the tripod furtherincreasing the stability of the instrument.
Wide operating temperature range. Allspecification are mel over the --40°C to+ 45°C. Optionally, Autograv meters maybe supplied rated to + 50°C. For usebetow -20°C the Display Heater Option,and Belt Battery Pack should be used.
589017
•Autograv Accuracy
18015012090Minutes
6030o
~ l.-~
.//
"- I I I I O·lmGaI
50./
Temperature
/' - h
7 Gr vitI---
/30
~--
/ "-
I--_._-
20i,
---- -
•"",~
"o
u
The high accuracy ot the AutogravGravity Meiers comes about mainlythrough automation, robust design, lowdrift, precise calibration and freedom fromtares. Field repeatability tesls areperhaps the best measure of a gravitymeIer's pertormance. Field testing ofAutograv meters demonstrates thatthe standard deviation of thedifference between individualreadings and station means is lessthan O.Ot mGal, that is, less than thereading resolution of the CG-3 andIGS-2/CG-4 instrument models.
Autograv temperature lest
Orangeville-Grillia Test Range Temperature Coefficient Pressure Coefficient Tests
USing a number of LaCoste andRomberg G and D meters. the Geological
•
survey of Canada has established a 140km test profile north of Toronto whichcovers a 120 mGal range. Typical runson this profile with Autograv GraVityMeters result in: 1) the largest differencebetween repeat readings at any station is0.02 mGal, 2) the standard deviation ofthe difference between the individualreadings and reference values is 0.008mGal and 3) the linearity is 0.015%.These repealabilities have been achievedeven when the instrument is transportedbetween stallons over badly corrugated,unsealed roads.
8
'0 4
•~
~ 6o•
12090
Oislcrnce 10 slolion ( km 1
Gravity (mGal)
60Minules
30
83 1"0
I I100 125
I I
Autograv pressure lest
•Difference bel ween
To determine the pressure sensl\ivity of anAutograv it is placed in a vacuum chamber.The pressure is quickly reduced from 1 to0.15 atmosphere where it is held for up to1 hour before being quickly returned tonormal pressure. While offsets of up to 0.1mGal occur at the two step functionchanges. the observed gravity valuesquickly return to normal. The pressurecoefficient is typically less than 0.03mGallatm. Errors are therefore negligiblefor the maximum pressure changes whichmight be observed in the field. ThISstrenuous test also proves that no damagewill be done to an Autograv which istransported in an unpressurized aircraft.
values (mGal)
measured and
reference gravily
o
, .
ITT Ti- l-J
01mG1J,I t- -1-1 -1--Gr(]v,'v-i -
- - -It I· j ..
1
II1011
11 B'''"''i :_.
Tr ·l+:=H. -
•
G'
•
I
",54
•
,'0
22"1
Olilward
R,lurl'l
o
oI
•Del. 87
The automatic cycling mode and analogchart recorder output are ideal featureslor use when Aulograv Gravity Metersundergo tests, They permit a permanentrecord of gravity to be made withchanges over lime.
In the high temperature test, an oven isplaced over an Autograv which is heatedfrom room temperature to above Itsmaximum operating temperature overabout 2 hours. The oven is then removedallowing the instrument to return rapidly10 room temperature. Typically. thetemperature coefficient of an Autograv isless Ihan 0.001 mGalrC within itsoperating temperature range.
For the low temperature test, a series ofreadings is made at room temperature,then the Autograv is placed in a freezerat -30°C tor approximately 4 hours. It isremoved and a series of readings startedimmediately. Typically the first fewreadings shown an offset of up to 0.003mGal. Thereafter there is no oNsel as aresult 01 the 50aC temperature shock.
...0·02+0'01a
Deviation of readings fromstation averages (mGal )
-0,02 -0,01
rr • 0-007 mGal
~
I
,•.aE 2,z
•Tcst rcsults far an Autagrav on the Orangevifle-Qrillia Te~f Range.
017 58~018
•Autograv Accuracy IGS-2!CG-4 Configuration
EM-4
/EM
CG-4Gravity
-::::::::::m
IGS-2Control
VLF-4VLF EM
+
IPRF-3 IP
/"System
tMP-4
Magnetics
The versatile /GS·2 system Con/rot Console reduces instrumentation, capilal costs, servicingexpenses and operator training to a minimum.
'''''0
! I I I T! , I I I I f -
I Oi mGoI I I I I I -~"Lr?- 1-,i ~ J,i i ' i MaQneli c FieldI~ G~"" Ir+t ' ,
1+1 I.J ' I if" :___~ I I X I I _.
Magnetic Field Coefficient
Gravity MeIers having metal elasticsystems may exhibit errors due toorientation in the earth's magnetic field orwhen used over highly magnetic rockIypes. To prove the insensitivity of anAutograv 10 such errors, a coil is orientedalong each of three perpendicular axesand fields of + 15 and -15 Gauss (30 to60 limes the earth's magnetic field) areapplied. The maximum deflection is nomore than 0.02 mGal. This lestdemonstrates that the earth's magneticfield will not cause measurement errorsand fhat no damage will be done to anAutograv which is exposed to strongindustrial magnetic fields.
,+
• r! '°AUlograv magnetic field lest
The IGS-2/CG·4/MP-4 configurnlion permitsone operator 10 efficiGnrly perform both gravityand magnetic measurements.
The performance specifications of theIGS-2/CG-4 configuration are identical tothose of the CG-3. The modular designof the IGS-2/CG-4, however, allows theuser greater flexibility as the IGS-2Console can be removed from theCG-4 Console and used with a varietyof other Sensor Options which areavailable from the IGS family ofinstruments_ Combinations of these IGSSensor OptIons can reduce yourinvestment in inslrumenfallon and permita SIngle operator to carry out certaincombined measurements, therebyreducing survey cosIs.
A CG-3 can be upgraded 10 anIGS-2/CG-4 by returning it to the Scintrexplant for modifications 10 the dataacqUISition/control unit,
To perform gravIty measuremenls usingan IGS-2 System Control Console, thefollowing items are required: 1) A CG-4Carrying Case, 2) A CG-4 AutomatedGravity MeIer Sensor which is installed,at the factory. Irlslde a CG·4 CarryingCase, 3) An EPROM that contains theIGS-2iCG-4 gravity program which IS
installed on the IGS-2 microprocessorboard, 4) A Gravity Method PrintedCircuit Board for installation inside anIGS-2 Console, and 5) Standard CG-3accessories.
018
Technical Descriptionof the CG-3 and
eIGS-2ICG-4 AutogravAutomated Gravity Meters
589019
Reading Resolutionom mllilgai.
Minimum Operating Range7000 mllligals. without resetting.
Residual Long-term DriftLess Ihan 0.02 milligal/day.
Typical RepeatabilityLess than 0.01 mGal standard deviation.
Range of Automatic TiltCompensation:::!:: 200 arc sec.
Dimensions240 mm x 310 mm x 320 mm.
Weight12 kg, Including standard battery.
Power Consumption.5 W ot + 25°C.
Operating Temperature Range--40°C to 145°C Optionally to + 50°C
Interval Between Readings inCycling ModeAdjustable trom 42 to 99999 seconds.
Standard Memory16K RAM internal solid-slate memoryrecords up to 420 gravity observations.Memory can be expanded 10 48K RAM.
Noise RejectionSamples ot more Ihan 4 standarddeviatIons from the average are rejected,if thIS feature is selected uponinitialization of (he instrument
Displayed and Recorded DataCorrected Gravity, Standard Deviation,Tilt about the X-axis, Tilt about the Y-axIs,Gravily Sensor Temperature, TidalCorrec!lon, Duration 01 Measuremenl,Time at start of measurement andHeader Information (including date andinitialization constants).
Digital Display32 character, 2 line LCD display.
• eYbOard Input14 keys for entering all commands,coordinates, header and ancillaryinformation.
Real Time ClockDay, month, year, hour, minute andsecond. One second resolution, 1 secondstability over 12 hours.
Digital Data OutputRS-232C serial interface. Data outputs in7 or 8 bit ASCII, one start, Iwo stop bits,no parIty format. Baud rate is selectableat 110, 300, 600, 1200 and 2400 baud.Carriage return delay is keyboardseleclable in increments of one from a to999. X-on/X-olf handshaking protocol
Standard Accessories
TripodGravity meter tripod with built-in bubbletevet and 0.5 m Jeg extensions; 2.0 kg.
Battery5.7 Ah, 2.2 kg.
Battery Charger115/230 V AC; 50160 Hz.
Optional Accessories
Belt Battery PackWorn inside the operators coat duringcold weather operation, the Belt BatteryPack IS used to keep rechargeablebatteries warm so (hat their lifetime canbe extended.
RS-232C Cable and AdaptorIncludes a special RS-232C data transfercable and adaptor. Used forcommunicating with peripheral devices.
Minor Spare Parts KitIncludes 2 keyboard diaphragms and twofuses.
Display HeaterRequired for cold wealher operation.Powered by main balleries,thermostatically-controlled lo turn offabove -20°C.
Chart Recorder CableThis cable interiaces with any standardchart recorder.
External Power CableRequired lor operation of the inslrumenlfrom either an external 12 V DC powersupply or battery.
Carrying Case for AccessoriesA case can be supplied which willaccommodate the Tripod, Belt BatteryPack, Battery Charger, RS-232C Cablewith adaptor and manuals.
Language OptionsIn addition to English, a second languageuSing Lalin characters can replaceFrench.
Memory ExpansionMemory can be added to complementthe 16K RAM Standard Memory. ThiScan be done in up to four 8K RAMincrements to raise the system memory10 a tOlal of 48K RAM. Each 16K RAMincrement holds as many readmgs as theStandard Memory.
Peripheral DevicesScintrex can recommend and supplysUItable digital printers, microcomputers,modems and cassette tape recorders.
Applications SoftwareScinlrex supplies fully documentedsoftware written for the IBM family 01microcomputers, and certain othermicrocompulers, which use the MS DOSoperating system. This software permits:1) archiving of data, 2) processmg ofdata and 3) profile and contour plotting.
SCINTREX
222 Snidercroft RoadConcord Ontario CanadaL4K 1B5
Telephone: (416) 669-2280Telex: 06-964570Fax: (416) 669-5132
Geophysical and GeochemIcalInstrumentation and Services
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