Northwest NCL-22 User Manual
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74.4 Horizontal Circle and Vernier ReadingYour instrument is equipped with a easy to read horizontal circle for simple angle turning. You can find the circleand index line above the circle-positioning ring. The horizontal ring is easy to use. It is graduated every singledegree and is numbered every 10 degrees.Use the plumb bob provided and set up the instrument directly above the surveying point. Sight the objective andset the horizontal circle to 0 degrees by turning the horizontal circle positioning knob. Turn the telescope to viewthe second observation of your angle. Use the fine motion tangent screw can to bring crosshairs precisely on linewith the tangent objective. Using the index line take the angle reading. The index line can be used for reading thecircle in increments finer than single degrees. This process is for estimation but the average user can position theindex line for finer readings.4.5 Compensator LockAll Northwest Instrument's NCL series Automatic Levels are equipped with a locking mechanism that protects thecompensator against rough handling, transporting and any time the instrument is in its case.The compensator lock can also be used as a compensator check. Push and release the lock button and jiggle thecompensator. It should return to the exact horizontal position observed before you pushed the lock button. Thiswill assure you that the compensator is working properly before you start a job, or after your instrument has beenknocked out of level.NOTE: This should not be used as a calibration test; regular inspection andcalibration by a qualified technician is recommended. |
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