光学和光学仪器 大地测量和地质勘测仪器的现场试验程序 第3部分：经纬仪

[中文适用范围]： ISO 17123 的这一部分规定了在建筑和测量测量中使用经纬仪及其辅助设备时确定和评估精度（重复性）时要采用的现场程序。 这些测试主要是为了现场验证特定仪器对于当前任务的适用性，并满足其他标准的要求。 它们并不建议作为本质上更全面的验收测试或性能评估。 ISO 17123 的这一部分可以被视为评估测量（更具体地说是被测量）不确定度过程的第一步。 测量结果的不确定度取决于许多因素。 其中包括：重复性（精确度）、再现性（日间重复性）、可追溯性（国家标准的完整链条）以及对所有可能误差源的全面评估，如 ISO 测量不确定度表达指南所规定（胶）。 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，并且经过专门设计，以最大限度地减少大气影响。 [外文原描述]： 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.