ISO 17123的本部分规定了在确定和评估精度（重复性）时应采用的现场程序 经纬仪及其辅助设备在建筑和测量中的应用。主要地 这些测试旨在现场验证特定仪器是否适用于当前任务 并满足其他标准的要求。不建议将其作为验收或性能测试 本质上更全面的评估。 ISO 17123的这一部分可以被认为是评估测量不确定度过程中的第一步 测量（更具体地说是被测量）。测量结果的不确定度取决于 许多因素。其中包括: 重复性（精密度）、再现性（日间重复性）， 可追溯性（国家标准的完整链条）和对所有可能错误源的彻底评估，如 由ISO《测量不确定度表示指南》（GUM）规定。 这些现场程序是专门为现场应用而开发的，无需特殊的辅助设备 设备和设备的设计目的是将大气影响降至最低。

This part of ISO 17123 specifies field procedures to be adopted when determining and evaluating the precision (repeatability) of theodolites and their ancillary equipment when used in building and surveying measurements. Primarily, these tests are intended to be field verifications of the suitability of a particular instrument for the immediate task at hand and to satisfy the requirements of other standards. They are not proposed as tests for acceptance or performance evaluations that are more comprehensive in nature. This part of ISO 17123 can be thought of as one of the first steps in the process of evaluating the uncertainty of a measurement (more specifically a measurand). The uncertainty of a result of a measurement is dependent on a number of factors. These include among others: repeatability (precision), reproducibility (between day repeatability), traceability (an unbroken chain to national standards) and a thorough assessment of all possible error sources, as prescribed by the ISO Guide to the expression of uncertainty in measurement (GUM). These field procedures have been developed specifically for in situ applications without the need for special ancillary equipment and are purposefully designed to minimize atmospheric influences.