Abstract
For the most part, the D/I fluxgate magnetometer is the only absolute instrument used in observatories and in the field. At present no company produces a nonmagnetic theodolite and there are only a few organizations converting geodetic theodolites to nonmagnetic instruments. A classic theodolite has many parts which have a magnetic moment. These parts have to be replaced before the instrument can be used as an absolute instrument for magnetic measurements. The most problematic part of these theodolites is the main axis. The precision of this part determines the overall quality of the instrument. Most observatories require 1″ resolution. This can be achieved by converting the Zeiss THEO 010 or the Russian 3TK2 theodolites. The Zeiss models have been out of production for more than ten years; the Russian theodolites exhibit various qualities. In the future it will be necessary to introduce new measuring techniques and new instrumentation.
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HEGYMEGI, L. (2006). PROBLEMS OF SUPPLY IN DI-FLUX INSTRUMENTS. In: Rasson, J.L., Delipetrov, T. (eds) Geomagnetics for Aeronautical Safety. NATO Security through Science Series. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5025-1_12
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DOI: https://doi.org/10.1007/978-1-4020-5025-1_12
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