Spectra Precision LL300N-3 User Manual

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Inordertoavoidoffseterrors,thereceivershouldbeusedclosetotheelevationwherethelaserhasbeensetup.

Ifaremotecontrolisavailable,theupanddownarrowbuttonscanbeusedforneadjustments.

LEVELING ACCURACY

Inuences on the leveling accuracy

Theoverallaccuracyoftheunitcanbeinuencedbymanyfactors:

• factoryaccuracy;

• temperatureoftheunit;

• ambientinuenceslikerain,windandtemperature.

The factor thatinuenceson the unit’s accuracymostis the ambient temperature. Vertical differences in

temperature near the ground can divert the laser beam, similar to the heat waves seen on hot asphalt

streets.

This factor also applies to all optical measuring devices such as automatic levels and

theodolites.

Accuracy Check

Toensurejob-siteaccuracy,youneedadistanceof20m(65feet)betweentwowallsAandB,whereyouwill

execute4measuringoperationsonatripodasfollows(transitmeasurement).

SettheunithorizontallyonatripodnearwallAandswitchitonwiththeplusX-axispointingtowardswallA.

Aftertheunitislevel,marktheheightofthelaserbeamusingareceiveratwallA.Turntheentireunit180°,

letitself-levelandmarkthecenterofthelaserbeamatwallB.

Now,placetheunitnearwallBwiththeplusX-axispointingtowardswallB.Aftertheunitislevel,markthe

heightofthelaserbeamatwallB.Turntheentireunit180°,letitself-levelandmarkthecenterofthelaser

beamatwallA.Thedifference(h)ofthemarkedpointsatwallAshowsthedeviation.

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Spectra Precision LL300N-3 Laser Level, Self Leveling Kit