| coordinate system composed of three mutually perpendicular axes (X-, Y- and Z-axes) as illustrated in Figure 1
Figure 1 – Quartz crystal axial system and designation
Note 1 to entry: Note that α quartz crystal expressed by the orthogonal axial system in IEC standards is different to that specified in IEEE Standard 176-1987. More details are provided in IEC 60758:2016, Annex F “Differences of the orthogonal axial system for quartz between IEC standard and IEEE standard".
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