Leica TPS700 Series Field Manual - Surveying Equipment

18Atmospheric ParametersDistance measurement isinfluenced directly by theatmospheric conditions of the airthrough which distancemeasurements are taken.ATMOSPHERIC PPM 1/2Temperature : 12 °CPressure : 1013 paAtmos.ppm : 0 Ht.a.MSL : 0 mRefr. Coeff: 0.13Under these circumstances,mesurements are corrected withatmospheric correctionparameters (PPM)The atmosperic distancecorrections are derived from theair temperature, from the airpressure or the height at meansea level and the relative airhumidity or the humiditytemperature.• PressureAir pressure at instrumentlocation.• Ht. a. MSLHeight above sea level atinstrument location.• TemperatureAir temperature at instrumentlocation.• Rel. Humid.Relative humidity of air in %(normally 60%)• Refr.CoeffInput of refraction coefficientfor the atmospheric conditions.• Atmos_ppmCalculated and indicatedatmospheric ppm.