3M Dynatel 2250M - Page 34

 34 78-8130-6150-0-F
12. SettheFrequencyandmodeofthereceiver.
a. PressFreq[SK]
b. Selectthesamefrequencyonthereceiver
asthetransmitterbypressingActive [SK
Toggle].
c. PressLocate/OK [5]tosavethesettingand
returntolocatemode.
d. PressMode [SKToggle]untilDirPkis
displayed.
13. StandawayfromthesuspectedtargetpathandadjusttheGain [4]down untilthe
bargraphopenscompletely.
14. Walkinawidecirclewithyourbacktowardthetransmitter(about10to15feet
(3–4.5m)away).
− Watchthereceiverdisplayandlistentothesignal.Takenoteofwherethe
receiverdetectsthestrongestSignalStrength[10].
− Thebargraphwillclosewhentheunitdetectsasignal,andthearrows
willreverse.
− AdjusttheGain[4]downifthebargraphclosescompletely.
− TheSignalStrength[10]numbersonthedisplaywillchangewiththesignal
strength(smaller,asyouwalkawayfromthetargetpath;larger,asyouapproach
thetargetpath).
− Makeacompletecirclearoundthetransmitter.Returntoeachpointinthecircle
thatthereceiverdetected.
15. Measurethedepthandcurrentofeachpointtoidentifythetargetpath.Thedepth
ofthetargetpathshouldbeasexpectedandtherelativecurrentshouldcompare
totherelativecurrentthatisalternatelyflashingwiththefrequencyvalueonthe
transmitter.
Note: The relative current reading will decrease steadily as the locator moves away
from the transmitter. When using higher frequencies, this decline is more evident.
16. Adjustthegainsothatthebargraphrespondstothetargetpath(openwhenoff
path,almostcompletelyclosedwhendirectlyovertarget).
17. Tracethecable/pipeataslowwalkwhilemovingthereceiverinaside-to-side
motion,keepingthereceiverperpendiculartotheground.
18. Measurethedepthandcurrentoccasionallytoverifytargetpath.