Performance monitoring of geodetic instruments

Basic Construction of the Flat Angle Calibration Test Bench for Geodetic Instruments

“…The third method is a classical one both in geodesy and in general technology [5,[9][10][11]. This method has been very widely used in the past and it requires a highly accurate circular scale and one or more (depending on the measuring method) microscopes (preferably photoelectrical) for the scale readings.…”

The Correlation Analysis of the Angle Measurements

“…The test rig constructed operates as usual comparator device -it compares the angular position of the rotary table (6, Fig 1) with the readouts of geodetic instrument (4) mounted on the table. An angular positioning of rotary table of the test rig is performed by the worm-gear drive with the step motor (7). Angular position of the rotary table is determined by photoelectric angle encoder (8).…”

“…Normally rotary disk angular positioning by the drive according to pulses from the photoelectric angular encoder is considered as "rough", and the precise angular value is determined by autocollimator and microscope. That way, the test rig is tested and calibrated by means of the installed instruments in it [7,8]. Usual procedure of testing consists of positioning (by the encoder) of rotary disc at a pitch of 30° (due to the number of faces of multiangular prism) in full circle and registering the autocollimator and microscope readings at every position.…”

Traceability enhancement in angle measurements

“…Preliminary calculations, based on the research are presented in [11,13] give the result of the combined uncertainty u 2 c ¼ ðh e Þ of the standard angle of p rad determination equal to 0:06 00 . .…”

“…Use of the standard angle created depends on the needs for angle values measurement or angle measuring instrument calibration. For the circular scale calibration, the three microscope method [13] can be used.…”