GPT-3000 SERIES - FLT Geosystems

4 DISTANCE MEASUREMENT4.7.1 Angle OffsetThis mode is useful when it is difficult to set up the prism directly, for example at the center of a tree.Place the prism at the same horizontal distance from the instrument as that of point A0 to measure.To measure the coordinates of the center position, operate the offset measurement after setting theinstrument height/prism height.When measuring coordinates of ground point A 1:Set the instrument height/prism height.Prism PWhen measuring coordinates of point A 0 : Setthe instrument height only. (Set the prism heightto 0 ).Prism heightInstrument heightWhen sighting to A 0 , you can select one of twoways. One is to fix vertical angle to the prismposition even updown the telescope position, andthe other is to gear vertical angle to the updown oftelescope movement. In case following thevertical angle to the movement of telescope,SD(Slope Distance) and VD(Vertical Distance)will be changed according to the movement oftelescope.To set this option, refer to Chapter 16“SELECTING MODE”.Occ. Point●●Set the instrument height/prism height before proceeding to the offset measurement mode.When setting the coordinate value for the occupied station, refer to Section 5.1 “Setting CoordinateValues of Occupied Point”.Operating procedure Operation Display1 Press the [F4](P1↓) key from distance measuring [F4] HR: 120°30'40"mode to get the function on page 2.HD: 123.456 mVD: 5.678 mMEAS MODE NP/P P1↓OFSET S.O S/A P2↓2 Press the [F1](OFSET) key. [F1]3 Press the [F1](ANG. OFFSET) key. [F1]4 Collimate prism P, and press the [F1](MEAS) key. Collimate P[F1]OFFSET 1/2F1:ANG.OFFSETF2:DIST.OFFSETF3:PLANE OFFSET P1↓OFFSET-MEASUREMENTHR: 120°30'40"HD:mMEAS --- NP/P ---OFFSET-MEASUREMENTHR: 110°20'30"HD* [n] Measuring...4-7