共找到 515 条与 量和单位 相关的标准,共 35 页
本文件规定了植物补光用LED灯产品的一般要求,性能和技术评价技术要求,包括分类、一般要求、光合光子性能要求、产品评价分级、测试方法。 本文件适用于在自然光不足的条件下的植物补光用的以LED为光源的电源电压超过1000 V的LED灯的技术评价。
General Evaluation Specification of LED Lamps for plants supplementary lighting
IEC 60375:2018 specifies the rules for signs and reference directions and reference polarities for electric currents and voltages in electric networks.
Conventions concerning electric circuits
This document gives names, symbols, definitions and units for quantities of acoustics. Where appropriate, conversion factors are also given.
Quantities and units — Part 8: Acoustics
Flight dynamics — Vocabulary — Part 7: Flight points and flight envelopes
Quantities and units — Part 5: Thermodynamics — Amendment 1
Quantities and units — Part 3: Space and time — Amendment 1
Quantities and units — Part 12: Condensed matter physics — Amendment 1
Quantities and units — Part 10: Atomic and nuclear physics — Amendment 1
Quantities and units — Part 8: Acoustics — Amendment 1
Quantities and units — Part 7: Light and radiation — Amendment 1
Quantities and units — Part 4: Mechanics — Amendment 1
Quantities and units — Part 9: Physical chemistry and molecular physics — Amendment 1
Quantities and units — Part 11: Characteristic numbers — Amendment 1
This document gives names, symbols, definitions and units for quantities of physical chemistry and molecular physics. Where appropriate, conversion factors are also given.
Quantities and units — Part 9: Physical chemistry and molecular physics
This Document provides considerations for countries and economies, or Regional Legal Metrology Organisations (RLMOs), that are planning to develop conformity to type (CTT) programs in the field of legal metrology. This Document also provides illustrative examples of CTT programs currently in operation.
Conformity to Type (CTT) – Pre-market conformity assessment of measuring instruments
Letter symbols to be used in electrical technology — Part 4: Rotating electric machines
Letter symbols to be used in electrical technology — Part 1: General
Letter symbols to be used in electrical technology — Part 1: General
Letter symbols to be used in electrical technology — Part 4: Rotating electric machines
What is BS EN ISO 80000-1 - Quantities and units about? The first in a multi-part international series, BS EN ISO 80000-1:2022 gives general information and definitions concerning quantities and units for general use by scientists and technologists. Who is BS EN ISO 80000-1 - Quantities and units for? Relevant across a wide range of disciplines such as international trade, manufacturing, human health and safety, protection of the environment, global climate studies and scientific research; specific users include: Electronics/telecommunications equipment and components manufacturers Aerospace component manufacturers Healthcare providers and medical equipment manufacturers Measuring equipment manufacturers Test/sampling laboratories Heat treatment service providers Casting foundries What does BS EN ISO 80000-1 - Quantities and units cover? BS EN ISO 80000-1 gives general information and definitions concerning quantities, systems of quantities, units, quantity and unit symbols, and coherent unit systems, especially the International System of Quantities, ISQ. The principles laid down in BS EN ISO 80000-1 are intended for general use within the various fields of science and technology, and as an introduction ...
Quantities and units. General
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