Spectra Precision LL300N-3 User Manual

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LL300

OPERATING EXAMPLES

Determining the Height of Instrument (HI)

Theheightofinstrument(HI)istheelevationofthelaser’sbeam.

TheHIisdeterminedbyaddingthegrade-rodreadingtoabenchmarkorknownelevation.

Setupthelaserandplacethegraderodonajob-sitebenchmark(BM)orknownelevation.

Slidethereceiverup/downthegraderoduntilitshowsanon-gradereading.

Addthegrade-rodreadingtothebenchmarktodeterminetheheightofinstrument.

Example:

Benchmark = 30.55m(100.23ft)

Rodreading = +1.32m(+4.34ft)

Heightofinstrument = 31.87m(104.57ft)

UsethisHIasareferenceforallotherelevations.

Marking Heights

Setupthe laserin horizontal mode(e.g., using atripod orwall mount)sothat thelaser beamis atthe

desiredheight.

Whenworkingwithoutatripodorwallmount,setupthelaseronastablesurfaceandmeasuretheheight

differencebetweenlaserbeamanddesiredheightbyusingarulerandmarkthemeasuredheightagain.

Vertical Application

Levelthetripodandallowthelasertolevelinautomaticself-levelingmode.

Pushthemanualmodebuttonandchangethelaser’spositiononthetripodforverticalalignmentbyusing

theverticalmountingthread.

Rotatethelaseruntiltheverticallaserplanealignswiththereceiver’son-gradeposition.

HeightofInstrument(HI)

RodReading

1.32m(4.34ft)

Benchmark

30.55m(100.23ft)

HI=RodReading+Benchmark

HI=1,32m+30,55m=31,87m(4.34ft+100.23ft=104.57ft)

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Spectra Precision LL300N-3 Laser Level, Self Leveling Kit