Ib qib yog qhov siab - ntsuas ntsuas qhov tseeb, sib txawv ntawm qhov ntsuas qhov tseeb, muaj peev xwm soj ntsuam, thiab siv tau. Cov txheej txheem engineering feem ntau muaj qhov tseeb ntawm 2 mus rau 5 millimeters ib kilometer, thaum siab -cov cuab yeej precision tuaj yeem ua tiav 0.3 mus rau 1 millimeter ib mais, ua tau raws li qhov yuav tsum tau ua ntawm siab - qib tswj kev soj ntsuam thiab kev tsim kho engineering.
Kev ua tau zoo ntawm lub tsom iav raj yog qhov tseem ceeb ntawm ib theem, suav nrog kev nthuav dav, thaj chaw saib, thiab qhov ntsuas qhov deb tsawg kawg nkaus. Magnification feem ntau yog nyob nruab nrab ntawm 20 thiab 30x kom pom tseeb ntawm lub hom phiaj; thaj tsam ntawm kev pom yog feem ntau ntawm 1 thiab 2 degrees, cuam tshuam rau kev soj ntsuam ntau yam; thiab qhov tsawg kawg nkaus tsom qhov nrug yog nyob nruab nrab ntawm 0.5 thiab 1 meter, kom ntseeg tau tias qhov chaw nruab nrab txawm nyob ze.
Leveling thiab them nyiaj pab kiag li lawm ntawm ib theem kuj muaj cov specifications. Cov cuab yeej leveling yuav tsum ua kom ceev ceev thiab ruaj khov, nrog rau kev hloov pauv npuas rhiab; Qhov tseeb ntawm cov nyiaj npib yog feem ntau nyob nruab nrab ntawm 0.5 thiab 5 arcseconds, muaj peev xwm los kho cov kab rov tav tsis raug. Lub ntsuas kub ua haujlwm, qhov hnyav, thiab kev ntsuas kev tiv thaiv kuj cuam tshuam rau kev yooj yim ntawm kev siv thiab kev hloov pauv ntawm thaj chaw.
