GPT-3000 SERIES - FLT Geosystems

17.3 Checking/Adjusting the Theodolite Functions17 CHECK AND ADJUSTMENT● Pointers on the Adjustment1) Adjust the eyepiece of the telescope properly prior to any checking operation which involvessighting through the telescope.Remember to focus properly, with parallax completely eliminated.2) Carry out the adjustments in the order of item numbers, as the adjustments are dependent oneupon another. Adjustments carried out in the wrong sequence may even nullify previousadjustment.3) Always conclude adjustments by tightening the adjustment screws securely (but do not tighten themmore than necessary, as you may strip the threads, twist off the screw or place undue stress on theparts).Furthermore, always tighten by revolving in the direction of tightening tension.4) The attachment screws must also be tightened sufficiently, upon completion of adjustments.5) Always repeat checking operations after adjustments are made, in order to confirm results.● Notes on the TribrachNote that the angle measuring precision may be effected directly if the tribrach has not been installedfirmly.1) If any leveling screw becomes loose and slack or if collimation is unstable due to the looseness ofleveling screws, adjust by tightening the adjusting screws (in 2 places) installed over each levelingscrew with a screwdriver2) If there is any slack between the leveling screws and the base, loosen the set screw of the holdingring and tighten the holding ring with adjusting pin, until it is properly adjusted. Re-tighten the setscrew on completing the adjustment.Adjustment screwAdjustment screwLeveling screw Holding ring Set screw17-7