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 26 78-8130-6150-0-F

ground.Otherpassivesourcesexist,suchasCathodicProtection,LFandCATVcable

(withNTSCTVCRTturnedon).

Walkinagridpatternoverthesweepareaholdingthereceiverasshowninthe

followingillustration.Stopwhenthereisaresponseincrease,locatethepositionofthe

maximumsignal,followtheconductorpathallthewayoutofthesweepareawhile

puttinglocationmarksontheground.Resumethesweepuntilanothercableorpipeis

detected,orthewholeareaiscompletelyswept.Switchtoanotheravailablepassive

frequencyinthereceiverandsweepagain.

D. One-person Active Induction Mode Sweeps

One-personactiveinductionmodesweepsrequirethatthetransmitterbesetonthe

groundoverthesuspectedpathoftheburiedinfrastructure.Thereceiverisusedto

detectsignalsinducedbythetransmitteronburiedlongconductors.Properplacement

andorientationiskeytomaximizetheinducedsignalintheburiedcableormetallic

pipeenoughtobedetectablebythereceiveralongeachpathinthesweptarea.(Note

thatnosignalisinducedontoaconductorwhosepathisperpendiculartotheInduction

Directionindication.)

• Placethetransmitterintheupright(bottomonground)positionfordirectional

optimizationwhenalignedwiththeInductionDirectionshownonthelabelonthe

transmitter.

• Tipthetransmitterovertowardsthefront,andlayitonit'sfrontsurface,formulti-

directionalwideareainduction.(Notethatnosignalisinducedontoaconductor

whosepathisdirectlyunderthetransmitter).

• RemoveanythingpluggedintotheOutput Jack [T-6](thiswillplaceunitinInduction

Mode),selecthighestavailablefrequency(200kHz)andhighestoutputpowerlevel.

• SelecttheInductionPeak(IndPk)modeand200kHzfrequencyonthereceiver.

Whenincloseproximitytothetransmitterininductionmode,thereisadirectsignal

fromtheinductionantennainthetransmittertothereceiverthroughtheair.Induction

Peak(IndPk)modeisanewlyaddedlocatemodeforuseincloserproximitytoa

transmitterinInductionmode(<60ft,20mtyp.).Special(single)Peak(SplPk)

wouldgivethehighestsensitivity,butisaffectedbytheairsignalmorethanInduction

Peak(IndPk)mode.

3M Dynatel 2250M User Manual

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