STONEX R6 Series - Calibrating Line-of-Sight and Vertical Index Error

R6,Calibration
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Beforestartingtowork,theinstrumenthastobecomeacclimatisedtotheambienttemperature.
Approximatelytwominutesper°Coftemperaturedifferencefromstoragetoworkingenviron‐
ment,butatleast15min,shouldbetakenintoaccount.
11.3 CalibratingLineofSightandVerticalIndexError
Lineofsighterror
Theline‐of‐sighterror,orhorizontalcollimationerroristhedeviationfromtheperpendicular
betweenthetiltingaxisandthelineofsight.Theeffectoftheline‐of‐sighterrortothehorizontal
directionincreaseswiththeverticalangle.
Verticalindexerror
Theverticalcircleshouldreadexactly90°(100gon)whenthelineofsightishorizontal.Any
deviationfromthisfigureistermedverticalindexerror.Thisisaconstanterrorthataffectsall
verticalanglereadings.
Beforedeterminingtheinstrumenterrors,level‐uptheinstrumentusingtheelec‐
troniclevel.TheLevel & Plummet isthefirstscreentoappearafterturningon
theinstrument.
Thetribrach,thetripodandthegroundshouldbeverystableandsecurefrom
vibrationsorotherdisturbances.
Theinstrumentshouldbeprotectedfromdirectsunlightinordertoavoidthermal
expansionononesideonly.
a) Tiltingaxis
b) Lineperpendiculartotiltingaxis
c) Horizontalcollimation,orline‐of‐sight,error
d) Line‐of‐sight
a) Mechanicalverticalaxisoftheinstrument,alsocalledstanding
axis
b) Axisperpendiculartotheverticalaxis.True90°
c) Verticalangleisreading90°
d) Verticalindexerror
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Bydeterminingtheverticalindexerrortheelectronic
levelisadjustedautomatically
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b
d
c
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c
d
a
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