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E. Two-person Active Induction Mode Sweeps

Intwo-personactiveinductionmodesweeps,onepersonholdsthetransmitterand

theotherholdsthereceiverwhilewalkingtogetherinasweeppatterndetectinglong

conductorsinthegroundwhencrossedbytransmitterandreceiverpositionsand

orientation,asshownbelow:

Transmitter Set-up

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

Mode),selecthighfrequency(200kHz),ormediumfrequency(33kHzor82kHz),

andhighestoutputpowerlevel.

• HoldthetransmitterwiththelidfacingupandalignitwiththeInductionDirection

arrowlabel,asshownonthetransmitter,withthereceiver

Receiver Set-up

• Setthereceivertothesamefrequencyasthetransmitter.

• SelecttheInductionPeak(IndPk)mode,andpresstheGain Adjust[4](+or-)key

untilthebargraphisjustvisible.

Sweeping

• Sweepingcanbedoneatclosedistancesbetweenthetransmitterandreceiver.

• Forbestresults,thereceivershouldbeatleast25feet(7.6m)awayfromthe

transmittertobegintracingthetargetpathandhavethegainsetbetween78-84%

whenstartingthesweep.Attemptingtotracethetargetclosetothetransmittermay

leadtofalseindicationsduetothereceiverdetectingthelargemagneticfieldradiating

fromthetransmitter.

• InductionPeak(IndPk)modecancelstheairsignalcomingdirectlyfromthe

transmitterinductionantennatothereceiver.Increasingthesweepdistancebetween

thetransmitterandreceiverreducesthedirectairsignalandallowsforsensing

deeperconductorsandsectionsofmetalpipes.UseInductionPeak(IndPk)mode

whensweepingdistancebetweenthetransmitterandreceiveris25–60feet(7.6–20

m).Beyond60feet(20m)youcanalsousetheSpecial(single)Peak(SplPk)or

DirectionalPeak(DirPk)modes.

• Special(single)Peak(SplPk)canbeusedformaximumdetectiondepthandrange

(neededfordeepconductorsandmetalpipes),butwouldrequireincreasedsweep

distanceseparationbetweenthetransmitterandreceiver.

3M Dynatel 2250M User Manual

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