The IEEE standard 1139 `` Standard definitions of Physical Quantities for Fundamental Frequency and Time Metrology '' is beyond that of a standard a comprehensive reference and educational resource . The IEEE - Standard 1139 `` Standard definitions of physical sizes for fundamental frequency and time metrology '' is a comprehensive reference and educational resource beyond a standard .
Standard IEEE 1139 "Definisi standard Kuantiti Fizikal untuk Frekuensi Asas dan Metrologi Masa"' adalah di luar standard rujukan komprehensif dan sumber pendidikan. IEEE - Standard 1139 "Definisi standard saiz fizikal untuk metrologi frekuensi dan masa asas"'adalah rujukan komprehensif dan sumber pendidikan di luar standard.