Mikron STINGER User manual

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PULSEINDUCTIONMETALDETECTOR
STINGER
USER’SGUIDE
MADEBYMIKRON
BULGARIA
2006

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a"STINGER"isan impulsemetaldetectorwithan LCD–Display,digitaland graphical
presentation ofthe levelofsignaland parametersofdiscrimination and working modes,as
well asof the stateoftemperatureofthe storage battery;
aFullyautomaticbalancetogroundconditionswithmemorizing andadapting tothe
levelandparametersofthebackgroundofsoil andtheireliminationbythegeneral
signal.
aReportingoftheinfluenceofearthmagneticfieldanditsisolationfromthegeneralsignal
aReportingofsidedisturbancesandtheirfull eliminationduring work
aPossibilityforworkinpremisesand inproximitytoelectricnetworks–fullsuppressionof
50 zdisturbances.
a10 regimesofwork-5dynamicand 5static-forcorrectlocalizationoftheobject.
aGeneralmode of workforall metals.
aThreemodesofdiscrimination -1fornormalsoil,1forsoilwithhighmineralization,and 1
forhighmineralizedsoilswithchanging background withinwide ranges+outerdisturbances.
aChoiceof2typesofsoundindication -VCO(multi–frequency one)ortwo-tonal
indication,lowtone formagneticandhigh tone fornon –magnetic(non -ferrousmetals).
aBuilt–instoragebattery,providing 10-20 hoursof constantworkdepending onchosen
power
aRegulation of thepowerofemittedimpulses
aAutomaticcharge ofthe battery–measuring ofcharged capacityand tracking of
temperatureduringcharging;
aTracking ofthecapacityofthestoragebatteryandautomaticsignalandturning off at
achieving of acriticalminimum.
aPossibilityforsetting ofover30 working andserviceparametersproviding comfortable
andeffectiveworkundervariousconditionsofwork.
aPossibilityforquickandeasyaccess toall settingsinthemenu;
aAllthesepossibilitiesallow„STINGER“toworkperfectlyunderanyground conditions,
includingathighmineralizedand pollutedsites!
„STINGER“hasthe following partsforcontrol:
Switcher"ON–OFF"forturningonandturning off
Buttons"SELECT", "◄and ►"serveforworkwiththemenu andthesettings,selecting of
amodeofdiscriminationandmotion.
Button"CLEARGND"–servesforautomaticsetting ofthedevicetogroundconditions
ofterrainwhereitworks.
Button"MODE"—usedatthemodesofdiscriminationandservesformomentaryswitching
into„ALL METALS"modeforpreciselocalization ofobjectwithoutlosing ofthe value of
memorizedbalancetothe ground inthe discrimination modes,aswell asforbalancing to

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the conditionsofthe soilthrough pressingand holdingofthe "MODE"and momentary
pressingof "CLEARGND"
-Button"DISCR"–servesforturningon andoffofthediscriminationmodes.
1.Setting and wayofwork:
Seekingframeisassembled and isplaced on the ground paying attention tothe range and
theredon'thavetobe anymetalobjects.
The cableissub -connected tothedevice.Thedeviceisturned onby"ON–OFF"and
yousee„StartDetector“onthedisplay.Nullificationstartsandbalancing toground
conditionsduring whichtimethedisplayshows"CLEAR"andyoucanhearasingle
sound.Thislastsfor3–4sec., thenitisfollowed byadoubleshortsoundandthe
deviceisturned oningeneralmode of"ALLMETALS".Ifyouwishtoworkinamode ofdiscrimination
"DISCR", theyou havetopushthe button"DISCR", atwhichthe deviceisswitched into
discriminationmode and thedisplayshows"DISCR.1".Itsnextpushing switchesagainthe
deviceinto"ALL METALS"mode.
2. Working withthe devicein"ALL METALS"mode
Inthismode thedisplayshows"ALLMETALS".Constantlyshownaerthelevelofsignal
ingraphicalanddigitallook,thecapacityofthestoragebattery,chosenpower,thelevel
ofco–working of thesoundand theworking mode,asfollows:
-1st rowtothe right–capacityofthe batteryinpercent:0%-100%
-2nd rowtothe right–chosen profileofwork-"prf1"or"prf2".Atbothprofilesthedevice
works withdifferent impulsepower-"prf1"–reduced, or"prf2"–fullpower.
-3rd rowtotheright –thresholdof sound, levelafterpassing of whichasoundappears
-4th rowtotheright–thelevelofsignalfromtheregistered metalinfigures–from 0–
400.Ifthereissignalofmetalwithintherangeofthecoil,disturbancesorinfluenceby
soil,uponpressing of"CLEARGND"indicationwill become"0". Afterremovalofthe
sourceofthesignalfromthecoil range,indication will becomeofnegativevalue.Inorder
tobenullified,you havetopushagain"CLEARGND". Uponpushing andholding of
"CLEARGND"formorethan4secthe devicesisrestarted.
Thedevicecan workin10 modesofspeedofseeking –5static(forprecise
localizationofobject)-"FIX0"-"FIX4", and5dynamic(forseeking withmotion)–"MOV0"
–"MOV4".

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"FIX“arestaticmodesofseeking,i.e.,the deviceconstantlyreactstoametal
located withintherangeofthecoil.Theyaresuitableforlocalizationoftheexactplaceof
analreadyfixed metal,andonemayconstantlyworkinthismode.Fastestoneisthe
"FIX0"mode,andslowestoneis"FIX4".
"MOV"aredynamicmodesofworkwithavariousspeed ofseeking.The
differenceamong thesemodesisinthe timeforautomaticnullificationofappeared
signals,i.e.thedeviceisconstantlysetadditionally,butwithavariousspeedat
individualmodes.Fastestoneisthe"MOV0"mode,and"MOV4"isslowestamong the
dynamicmodes.Atthesemodesthedevicereactstometalobjectswithintherangeof
theantennaonlyatmotionoftheantennaabovethem.
Onthe2nd and4th rowofthedisplaytotheleftgraphicalindicatorsaredepictedof
thelevelformorecomfortabletracking ofthe changesinthesignal.Indicatorscanshow
positiveornegativelevelsrespectivelyincreasing totherightortotheleftfromthe
dividing zeropointofeachofthem.
Theindicatoronthe2nd rowisindicatorofthemomentarysignal.Ata"FIX"mode
itrepeatstheindicatorofthegeneralsignal.In"MOV"mode itonlyshowsthechangein
thesignal.
Theindicatoronthe4th rowisanindicatorofthegeneralsignal.Itshowsthe
summarysignalofthecoilwithoutprocessing.
Normally,bothindicatorsshowpositivevaluesatapresenceofasignal,afterits
disappearancetheyshow"0"orhesitate (-1...0...+1).
Shouldwithinthecoil rangetherefallsinametalobject, itprovokesasignalwhich
isdepicted onthe2nd leveloftheindicatorandofthedigitalindication ofthesignal.
Shouldthissignalislouderthanthechosenthresholdofthe sound"tr_A", asoundis
heardwithafrequencywhichdependsonthelevelofthesignal.Themorelouderthe
signal,themorehigherthesoundfrequency.
Shouldthegeneralsignalbecomeshigherthan"90", levelindicatorsshow
">>>>>>>>", andthedigitalindicationcontinuestotracktheincrease,thesoundisalso
changed.Ifthelevelofoverfill isachieved,hesoundischanged toaveryloudsignal
tone,and„OVERFLOW“appearsonthe4th rowofthedisplay.
3. Setting of working parametersin"ALL METALS"mode:
setting ofthethresholdofco–working ofthesound"tr_A"–thisisthelevelofsignal
afterpassing ofwhichasoundisheard.Thedevicemaybesetatsuchstrengthofsignal
toreactwithsound.Thisisdonewithchangeintheparameter"tr_A". Forthispurpose
thearrowismoved through "SELECT"tobeagainst„tr_A"andthrough thebuttons"◄

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and ►"desired valuecanbechosen.Forendyoupress "SELECT"andthearrowgoes
downagainonthe 4th rowforchoiceof"FIX"or"MOV"modes.Thevalueof"tr_A"may
bechanged onlyat"FIX"mode,inmodes"MOV", pressing of„SELECT“isnotserviced
bythesoftware.Thelowerthevalueof„tr_A", thegreaterthesensitivityofthedevice.
Forinstance,ifatabalanceddevicetheconstantsignalfromsoil is"1"andwehave
chosenfor"tr_A"avalueof "1", thenasound signalisgoing toappearwhenthegeneral
signalbecomesgreaterthan"1". Ifforexamplefor"tr_A"avalueof"6"hasbeenchosen,
thenthedeviceisgoing toreactwithsound ataconsiderablystrongersignal–value
greaterthan"6". Greatervaluesof"tr_A"canbeselected ifthegeneralsignalfromthe
backgroundofsoil changeswithinwiderlimits,inorderthedevicetobecalm,aiming a
soundsignalnottoneproducedwhichisnotduetodetected metal,butthegreaterthe
value of “tr_A”,themoresensitivityof the devicedecreases!
-changeofworking power-the devicecanworkinamode offull power"prf2“and
reduced power"prf1"ofemitted signal.
Selectionoftheoneoroftheotherprofileisdonethrough pressing of"SELECT"
until thearrowisfixed onthe 2nd rowtotherightbefore"prf"and through the"◄and ►"
buttonsthedesiredpowerischosen"prf1"or"prf2". Workisnormalin"prf2"inordera
normaldepthtobeachieved,and"prf1"isusuallyused whenalargeobjectisdetected
atasmall depthinearth.Then the signaliscontinuousinordertodeterminethe exact
placeof theobjectit ismoreconvenienttouse„prf1“.
Thusthesignalfromthedetected objectbecomesmuchshorter.Itisnecessaryto
haveitinmindthatateveryswitching of“prf1”or“prf2”thedevicerestarts,inorderto
defineall working parametersinaccordancewiththepowerchosen.
Incaseofdisbalanceyoushouldpush“GNDCLEAR”andtheantennashouldat
thesametimebeclosetotheground.
Whenworking at“ALL METALS”itispossibletosomeextenttodeterminethe
sizeofthedetectedobject, bypressing thebutton“MODE”.Thanthedeviceworksat
“CHECK”mode,whichisused forquickchecking thelengthofthesignal.Non-ferrous
metalsandtheverysmallferrousonesaregistred withashortsignal,whilethebig
ferrous(magnetic)andandthebignon-ferrousmetals–withalong signal.Thedepthat
whichtheobjectisberried isalsoimportant.
4.Setting up theworking parametersin“DISCR”mode
“STINGER”has3discriminationmodes-“DISCR.1”,“DISCR.2”and“DISCR.3”,
thatarechosen bypushing the“SELECT”button,until thearrowpointsthediscrimination
indication -1st lineandthe“DISCR”mode shouldbeon.

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Whendiscriminationison,besidesthesignalstrengthtwomorevalueslightup C1
and C2,whichwhenaferrous(magnetic)metalisregistered havenegativevalues,and
incaseofanon-ferrous(non-magnetic)metal–havepositivevalues.“C1”isthevalue
forchromaticityof metal,and“C2”-isavalue foritsmagnetism.
Mostoftenwhenanon-ferrousmetalisdetected C1 hasaverybigvalue,e.g. +10
+15,whilethevalueof C2 isaroundzero.
Whenfoil,aluminiumandironthatisnotrusty, C1 and C2 havenegativevalues,
andtheirvaluesarebigandpositive,whenthenon-ferrousmetalispure,withoutalloys–
gold,bronze,copper,silver.Whenahighlyrustediron isdetected, C2 hasahigh
negativevalue,e.g. -10 -15, and C1 isaround zero.
C1 and C2 canhavedifferentvaluesif ferrousand non-ferrousmetalispresentwithinthe
coilrange.
Thevalues C1 and C2 appearonlywhenmetalisdetected,and whenthesignalis
missing ,“tr_C”and “tr_D”lightup intheirplace,as:
“tr_C”isthethresholdofsoundchangefromlowtohigh tone.Itexpressesthe
value of C1,beforewhichthe signalisalowtoneandafterit-ahigh tone.Forexample
if“tr_C”is 5,signalswithlevelslowerthan 5will beregistredwithalowtone,andin
caseofsignalsexceeding 5,ahigh tonewill beheard.Usually“tr_C”shouldbe 1sothat
signalswithpositive“C1”areregistredwithahigh tone,ornon-ferrous.
“tr_D”isthethresholdofsoundharmonisationindiscriminationmode.It
determinestheminimumrateofsignal,afterwhichthecalculationofthe C1 and C2
valuesbegins.The“tr_D”setting lightsup onthe3d lineattherightsideandis
analogicalto“tr_A”.Smallervaluesof“tr_D”will ensurethebeginning ofthe
discriminationincaseofweakersignals,butthatcouldlead tomoreunstableindications
orfakesignals.

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Thebalanceindicator“I-I”regarding thesoil backgroundlightsup on the1st line
attherightside andshowsifthedeviceisbalanced whenthesignalismissing.When
thedeviceisbalanced andtherearenometalobjectswithinthereachoftheantenna,
theindicatorshouldhavetwoequallevelstotherightandtotheleftofthe“ - ”symbol.If
thereisadifferencebetweenthetwolevelsthedeviceshouldbebalanced again,by
pressingthe“CLEARGND”button.Thelevelofthetwocolumnsofthebalanceindicator
showsalsothepowerofthesignalfromthesoil.Thehigherthelevel,thestrongerthe
signalandthustheoperatorcangetorientatedwhichdiscriminationmode touse–when
thesignalisweak(lowindicatorlevel)itisrecommended toworkat“DISCR.1”,whet itis
at averagelevel-“DISCR.2”,andathigh levels(strong signalfromthesoil)-“DISCR.3”
Whenthe“SELECT”buttonispushed atadiscriminationmode andmovementof
thearrow(>)at1st line,thetypeofdiscrimination canbechosen “DISCR.1”,“DISCR.2”
or“DISCR.3”.Ifthediscriminationtypeisnotchanged,afterasecondpushing ofofthe
“SELECT”button,thearrow(>)will positionitselfatthe3dlineand“ggt2”and “ggt3”will
lightup.Bythemthepossiblerangeofsignalsischosenwhenitisbalancedtothesoil
conditions.“ggt2”-at “DISCR.2”,and“ggt3”at“DISCR.3”.
“DISCR.1”isanappropriatemode whenthesoil backgroundisdisparaginglysmall
anddoesnotsignificantlychangethesignal,receivedwhenametalobjectisdetected.
-Whenthesall ismoremineralised,ittransmitsasignal,thatcanincreasesignificantly,
especiallywhentheframeisclosetothegroundsurface.Thehighlymineralised soils,
especiallyiftheyhaveahigh moisturecontent, additionallyincreasethetotalsignalandit
canhavehigh values.Ifthereisanon-ferrousmetalinthistypeofsoil,itwill invertthe
overall signaltomorepositivevalues,thusthesensitivitywill decreasebecauseofthe
soil background.
-Forcaseslikethatthe“DISCR.2”mode isappropriate,wherethe average background
levelsareassumed tobeequaltozeroandeachinstantincreaseofthesignaldetected
fromametalobjectwill besignalised.
Thesensitivityatthismode isgreater,becausethesignalappearsbeforethesoil
backgroundistotallycompensated.Forexampleifthesoil backgroundis“C1=-7”,in
caseofincreasing to -6,-5 thedevicewill makeasignal,whileatanormal
discrimination,thesignalshouldincreaseover0,inorderforasoundsignaltoappear.
Somewhataflawofthismode is,thatitcan giveasignalwhenevenwhena
ferrousmetalisdetected,withitsowncoefficient,morepositivethanthatofsoil.For
exampleifthesignalfromthesoil is -7,and thatofmetalis -3,thedevicewill makea

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soundsignal.Inthiscase,thevaluesof C1 and C2 shouldbeobserved,andthusthe
operatorcanmakeaconclusionregarding the typeofthemetal.
-Inthe“DISCR.3”mode thesignalisanalysed andincaseofchange,itiscalculated
whatpartof itisaresultoftheoveralsoil background andtowhatextenditisaresultof
theimpactofanotherobject. Thusitiscalculated whatisthesignalcoming fromthe
objectitself,it isclosetothis, ifthesoil doesnothaveitsownbackgroundoriftheobject
isintheair.Forexampleifwehaveasignalfromametalobjectwithitsowncoefficient
“C1=-3”located insoil,thathasitsownbackground“-7”,atthismode therewill beno
signal,becauseafterobtaining thesignalofthemetalfromthesoil background andits
discrimination,theresultwill benegative(“C1=-3”).Similartothe“DISCR.1”therewill
beasignalonlywhenthevaluesarepositive.Thedifferencebetween“DISCR.3”and
“DISCR.1”isthatwith“DISCR.3”thesignalfromtheobjectdoesnothavetocompensate
thesoil backgroundfullyinordertoreactwithsound.Fromtheoveralsignalthe soil
backgroundsignalseparatesandonlytheusefulsignalstays.If discriminated non-
ferrousmetal,thedevicewill reactwithsoundalthough thesoil background couldhave
high negativevalue.Thesensitivitywith“DISCR.3”ishigherthan with“DISCR.1”butitis
bettertouse“DISCR.3”onsoilswithincreased mineralizationandabackground
changing withinlargelimitsandalsoupon presenceofouterdisturbances.
Oneshouldbareinmindthattheefficiencyofthediscriminationdependsquiteon
thesizeofthemetalobjectand thedepthitissituated inthesoil.Itcouldbe100%
accurateforsmall and middle-sized objectssituated on thesurfacelayer(withdepth
approximately50-100 cminthesoil),up to50-60%accurateforbigmetalutensil (1x1m
forinstance)buried at2-3minthesoil.Thatistosaythe biggertheobjectthedeeperit
isburied inthesoil andthe harderitistobediscriminated.Smallercoilshavebetter
opportunitiesfordiscrimination.
5. Balancing towardsthesoil background indiscriminationmodes.
In“DISCR.2”and “DISCR.3”anopportunityisprovided tosetthe device
automaticallyaccording tothesoil background.
Whenpressing the“SELECT”buttonindiscriminationmode andmoving thearrow
(<)onfirstrowyoucanselectthediscriminationmode “DISCR.1”,“DISCR.2”,or
“DISCR.3”.Ifthediscriminationtypedoesnotchangewiththenextpressing ofthe
“SELECT”buttonthearrowwill bepositionedonthirdrowand“ggt2”and“ggt3”will be
displayed.Through themtheacceptablevariationscouldbechosen whenbalancing to
thesoil conditions.“ggt2”-at“DISCR.2”and “ggt3”at “DISCR.3”.

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Foradaptiontothesoil press andholdthe“CLEARGND”button.Onthefirstrow
ofthedisplayyouwill see “Getground”andthedevicewill makeacontinued soundfor
adaptationstart. Afterthatyoumustbring closerandthenmoveawaythesearchcoilto
andfromtheground surfacewithinthe rangeofnormalsearching distances,5-20 cmfor
instance. Witheverymoveup-downthe devicesanalysesthereceiving signaland makes
shortsound.
Iftheparametersofthesoil backgroundexceed therangeofthecurrentchosen
background,adaptationshall berestarted andthedevicewill makethatlong sound
again.
Wheninfull movementup-downtheshortsoundstopsforadditionalsetting or
long oneforadaptationrestartdespitetheremightbesignalalterationsbecauseofthat
particularmovementthenthe adaptationiscompletedmeaning thedevicehas
rememered thevariation limitsofthesoil signal.Thenyoureleasethe“CLEARGND”
buttonandyouwill hearaconfirmativedoubleshortsoundforsuccessfulbalancing of
thesoil background.Afterthesuccessfulbalancing onthe firstrow,onthe rightside of
thedisplayyouwill seetheaccepted bythe applianceaverage value forsoil background,
“gnd 17”forinstance.Thisvalueisconsideredtobetheconditionalenvironment(“0”) of
discrimination.Thevalueof“C1”becomes“0”andeverysignalwithmorepositivevalue
will besignalized withsound.
Ifyoureleasethe“CLEARGND”buttonbeforethesuccessfulbalanceofthedeviceyou
willsee“gnd ???”-signalization formissing tone and itwill constantlyreleaseshort
sounds.
Ifthesoil signalvariesinwidelimitsaconstantrestarting ofthesoil balanceis
possible.Inthatcaseyoushouldincreasetheacceptabletoleranceofadaptation asyou
increasetheparameter“tr_D”of 2or 3(1isnormal).Thatwill allowadaptationatbigger
variationsbutitwill resultincertaindecreaseinthesensitivitytonon-ferrousmetals.
Ifaftersuccessfulbalancing during searchthesignalfromthesoil background
fadesawaysufficientlyandgetsevenquieterthan theremembered minimuma
signalizationformissingbackgroundwill appear-“gnd ???”Inthatcaseyoushould
eitherbring theaerialclosertothesoil during searchorrepeatthebalancing.
Whenlocating ametalobjectinthesoil during searchindiscrimination modesthe
devicemakesashortsound withonefrequency.Thatmakesithardertofind the exact
location oftheobjectinthesoil thanitiswithasoundwithchanging frequency.Forthe
purposeanopportunityisprovided fortransitorychanging into“ALLMETALS”mode for
locating during discriminationsearch.Thisisdonebypressing andholding the“MODE”
buttonandonthedisplayyouwill see “ALL METALS”andthedeviceswitchestoamode
ofmulti-frequencysoundindicationfortheeasierlocating oftheobject. Afterreleasing
the“MODE”buttonthedevicereturnstothediscriminationmode andthebalance
settingshehadbefore.Ifyouswitchoff“DISCR”andgoto“ALL METALS”mode the
objectcouldbelocated aswell butafterthatwhenyouswitchonto“DISCR”againyou

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will havetoperform soil backgroundbalancing againwhereasifyoupress andholdthe
“MODE”buttonforlocating thedevicekeepsthesettingsithad beforethediscrimination
mode.
Thediscriminationmode “MODE”couldalsobeused forbalancing the deviceto
thesoil conditionsbypressing andholding “MODE”andtransitorypressing “CLEAR
GND”.Normallywhenworking indiscriminationmode thepressing of“CLEARGND”is
notmaintained bythesoftware.
6. Thedetectiondepthdependsonthefollowing:
-size,shapeand locationoftheobjectinthe soil.Thebiggerthereflecting surfaceofthe
objectthedeeperit istobefound;
-soil compositionandmineralization level–thedrierandmorehomogeneousthesoil the
easieritwill betoadaptthedeviceandforthe devicetodetectdeeper.Understones,dry
sandorinclayutensil,metalsareeasiertobe foundthaninfreshlydug outordampsoil.
-thelongerthe objecthasbeeninthe soil theeasieritwill betobefound asaresultof
thegood contactwiththesoil.The longertheobjecthasbeeninthegroundthebigger
thefieldisandimitatesbiggerobject!
-typeofdetecting coil.Thebiggerthediameterofthecoillthedeeperitwill beableto
detectmetals.
-operator's experienceandskills.
Youcando fieldtestsbyyourselfusing thedeviceifyouburydifferentmetalobjectsin
differentdepthbutyoushouldleavethem inthegroundforatleast3months.Thusthe
testresultswill bemorereliable.Youshouldmindthesoil typeandthemoisture
compositioninit. Bestresultsarereceivedwhenthesoil isdry.
7.Charging storagebatteriesand indicationsfortheirstatus.
“STINGER”hasabuilt-instoragepackage 18V/2,3Ah,whichisabletoprovide 10-
20 hoursofworking process withoutanyinterruption depending on thechosenpower
andthetypeoftheused searchcoil.Biggercoilsconsumemorepowerandthusthe
workingtimeisshorter.
Theaccumulators'statusisshownonthefirstrowontherightaspercentsofthe
capacity(0%-100%).Whenthecapacitydecreasesbelow 0% itwill show“---”and iffully
charged batteriesorifusing externalsupplying blockwithhighervoltageitwillshow
“+++”.Ifitshows“---”ontheforthrowofthedisplayitwill say“SIGNALERROR”.
Thecharging isautomaticandbeginswhenthedeviceis SWITCHEDOFF and
youplug thechargerintothecharging jackofthebackpanelof thedevice.Thejackcage
is“-”andthemiddleterminalis“+”.During charging onthedisplayyouwill seetransitory
andmaximumvoltageofstorage batteries,theirtemperature,aswell asthe chargedso
farcapacityandon thelowerrowofthedisplay“Charging”.

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Thecharging continuestill themomentwhenthebatteriesreachtheirmaximum
capacitywhichalsoreflectsinincreaseinthetemperature.When reaching theirfull
capacityandincreaseinthetemperatureup to 40 Cthecharging stopsanddownonthe
displayyou will see “FULL”.Atthesametimethedevicewill starttomakeshortsound
signals.
Alwayschargedevice'sstoragebatteries ONLYwiththepairedchargerstoit.Thus
you will preventdamages orconfusion between“+”and “-”because theuse of
otherchargersoradaptorsmay leadtoirretrievabledamages inthebatteries!
Possibleproblemsduring exploitationof “STINGER”:
1.Whenswitching itonyoucannothearasound,thereisnoinformationonthe
display,noindicationthatthedeviceisswitched on.Itmight indicatefor:
-storagebatteriesaredead(usuallyafteralong period oftime).Chargethebatterieswith
thecharger.Iftheproblemisnotsolved contacttheservice-station (office)ofthe
companymanufacturerorthelocaldistributor.
-theaccumulatorblockconsistsofthree elements 6V/2,3V connected inseries.If just
oneofthemisdamaged theconnectionbetweenthemwill bedestroyed andpractically
thedevicewill beleftwithoutpowersupply.
2.Theworking depthissignificantlyshallowerthanthenormal.Itmightindicate
for:
-storagebatteriescouldbedead –payattentiontotheshown%forthecapacityofthe
storagebatteries.Ifitis“---”chargethebatterieswiththeautomaticcharger.Ifyou can
notsolvetheproblemcontacttheservice-station(office)ofthecompanymanufactureror
thelocaldistributor.
3.During detectionthedevicedoesnotworkstable,makesstrangesoundswhich
arenot duetoametaldetection.Itmightindicatefor:
-irregularelectromagneticexternalinterruptions.
-problemswiththeaerialcable–disconnected conductor,ashotcircuitorbad
connectioninthecoupling.Ifdisconnected conductororshotcircuitinthe cableonthe
lowerrowof thedisplayyouwill see “SIGNALERROR”.
Itispossibleaftercontinuanceworkandmanytimesofswitching onandoff the
cable's coupling tothejackboxthe contactbetweenthemtobedestroyed.Thereare2
terminalswithsightholesinthejackofthebackpanelofthedevice.Putsomething sharp
likeaknifeorascrewdriverinthesightholesandmakethemwider.Thusthecoupling
will fitbetterintothe jackwhichwill improvethecontactbetweenthem.Itispossiblein

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thepresenceofsomekindof dirtylikedustormoisturetocleantheterminalswithcotton-
woolandalcohol.Ifyou cannotsolvetheproblemcontacttheservice-station(office)of
thecompanymanufacturerorthelocaldistributor.
4.Thedeviceworksonlywithheadsetandwhenworking withamplifieryoucannot
hearasound.Usuallythathappenswhentheheadsetjackisdamaged.Inthatcase
contacttheservice-station(office)ofthecompanymanufacturerorthelocaldistributorto
changethejack.
5.Whenswitching onthechargertochargethestoragebatteriesyouwill see on
thedisplay“FULL”.Usuallythathappenswhenthedevicewaskeptinthecoldandthe
batterytemperatureisaroundorbelow 0C.Ifthemicroprocessorcan notdefinethe
batteriestemperatureyou cannotstratthe charging andonthedisplayyouwill see
“FULL”.Leavethedeviceinawarm premiseandwaittill thetemperatureofthebatteries
increasesup to 5-6ºC.
Ifyoucannotsolvethe problemcontacttheservice-station(office)ofthecompany
manufacturerorthelocaldistributorand donotcharge withanyotherdevicesor
ordinaryadaptors.
6.Batteriescharge quicklyand afterthatduring theworking process theygodead
quickly.Usuallythathappenswhenthebatteriesarereallyoldandneedreplacement.
Contacttheservice-station (office)ofthecompanymanufacturerorthe localdistributor
forchangeof thestoragebatteries.
The Manufacturer(trader) doesnotbearanyresponsibilityifyou usethe devicein
violation ofthe law,on archeologicalorforbidden forsearchplacesaswell ason private
propertywithout the knowledge orthe permission of the owner.
Protect the environmentand always fill back inthe holesyou havedugged out!