Trimble Spectra Precision LL300 - Page 7

8
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)
HI
131050_01_LL300_GB.indd 8 30.10.13 08:12