TS EN 60027-3
Letter symbols to be used in electrical technology - Part 3: Logarithmic and related quantities, and their units
Applies to logarithmic quantities and units. Quantities that can be expressed as the logarithm of a dimensionless quantity, such as the ratio of two physical quantities of the same kind, can be regarded and treated in different ways. In many cases, differences do not affect practical treatment.
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About This Item
TS EN 60027-3 is the part of the letter-symbols series for electrical technology that addresses logarithmic quantities and the notation of their units. It supports consistent symbol use where ratios, levels, and similar comparative quantities are expressed in logarithmic form.
What logarithmic quantities mean in practice
Logarithmic quantities are associated with values that can be expressed as the logarithm of a dimensionless quantity, typically the ratio of two physical quantities of the same kind. In electrical and electronic practice, logarithmic expressions are common for gain, attenuation, levels, and related descriptions. They provide a compact way to represent very large ranges and help keep unit and symbol usage consistent, especially in contexts linked with dB notation.
How this part is used
- Symbolic notation for logarithmic quantities and their units
- Expression forms based on ratios of like physical quantities
- Cases where practical differences in formulation do not change the engineering meaning
The standard focuses on consistent letter symbols for these quantities, while the broader technical context explains why multiple expressions can exist for the same underlying comparison. This makes terminology and notation in electrical-technology documents clearer and easier to compare.
- Publication Date: 3.07.2007
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 29.160.01 Döner Makinalar (Genel); 01.075 Karakter Sembolleri
- Pages: 5
- Source Standard: EN 60027-3:2007
- International Equivalents: IEC 60027-3-EQV; EN 60027-3-EQV
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