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在 1.5 GHz 频段工作的卫星导航接收机检测项目报价? 解决方案? 检测周期? 样品要求? |
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本标准适用于固定式剂量率仪、报警装置和监测仪,这些仪器用于防止或减轻放射性释放或燃料劣化使其保持在核动力厂(NPP)/核设施(NF)的设计基准之内,并在核动力厂/核设施出现或导致放射性释放或者人员受到辐射照射危险的事件期间或之后,对人员发出警告以保证其安全。按照IEC 61226:2009,设备分为“A”类、“B”类、“C”类或“无类别”。本标准涉及的设备用于各向同性地测量由能量范围在50 keV~7 MeV的X或7辐射产生的空气比释动能、周围剂量当量或其他照射量。设备主要用于辐射防护目的并可在获得或保持核动力厂安全中起辅助或间接作用。在本标准规定的范围内,仪器测量的有限能量范围至少覆盖80 keV~1.5 MeV。一般规定这类装置作为区域辐射监测仪。通常这些装置用于连续确定在辐射场可能随时间变化的工作区域(例如,核动力厂、粒子加速器、高放射性实验室、核燃料后处理厂)中的放射性状况,并在辐射场超出预定限值时提供报警。这些装置也用于与安全有关的保护系统中,例如,允许进入可能受辐射场照射区域的人员通道控制系统。本标准也为在脉冲辐射场使用的设备给出了指导,例如,测量由脉冲辐射或粒子加速器产生的辐射。由于本标准规定的大多数设备在脉冲辐射场中工作可能给出错误读数,所以这种指导十分重要。本标准涉及的装置至少包括:--探测器(例如,电离室、盖革-米勒计数管、闪烁计数器、半导体)装置;--测量装置可安装在中央控制盘上,并对报警装置和监测仪提供输出信号并能触发报警或紧急停堆/联锁电路的触点以达到辐射防护目的。本标准还适用于为特
本标准规定了在微波频率下利用双谐振器法测试超导体表面电阻的方法,测试目标是在谐振频率下R<下标s>随温度的变化。改进型镜像介质谐振器法,作为另外一种可选用的方法,在附录B中给出。本标准适用于表面电阻的测试范围如下:——频率:8 GHz<f<30 GHz;——测试分辨率:0.01 mΩ(f = 10 GHz)。测试报告给出在测试频率下的表面电阻值,并且给出利用R<下标S>∝f<上标2>的关系折合到10 GHz的值。
本标准定义了水轮发电机组状态在线监测系统的术语、提出了状态在线监测系统的系统功能、基本结构、测点布置以及相关技术要求,适用于水电站各种类型水轮发电机组的状态在线监测系统的设计、制造和运行管理。
GB/T 29306的本部分规定了以谐振法测定绝缘材料介电性能的试验方法。 本部分适用于以谐振法测定微波频率范围(即从约300MHz一直到光频)中固体、液体或熔融状介质材料的相对电容率、介质损耗因数和与此有关的量,如损耗指数。
This Recommendation proposes methodologies for determining performance objectives for digital systems in the 11.7-12.7 GHz, and sets availability objectives for digital systems that are higher than those for analogue systems. Annex 1 to this Recommendatio
Digital System DH, also known as the hybrid satellite/terrestrial WorldSpace system, is designed to provide satellite digital audio and data broadcasting for vehicular, fixed and portable reception by inexpensive common receivers
This Recommendation is intended to provide a basis for the derivation and estimation of the values of electromagnetic radiation from a broadcasting station that occurs at particular distances from the transmittersite. Using such information, responsible
This Recommendation is intended to provide a basis for the derivation and estimation of the values of electromagnetic radiation from a broadcasting station that occurs at particular distances from the transmitter site. Using such information, responsible organizations can then develop appropriate standards that may be used to protect humans from undesirable exposure to harmful radiation. The actual values to be applied in any regulation will naturally depend on decisions reached by responsible health agencies, domestic and worldwide.
This Recommendation is intended to provide a basis for the derivation and estimation of the values of electromagnetic radiation from a broadcasting station that occurs at particular distances from the transmitter site. Using such information, responsible organizations can then develop appropriate standards that may be used to protect humans from undesirable exposure to harmful radiation. The actual values to be applied in any regulation will naturally depend on decisions reached by responsible health agencies, domestic and worldwide.
This Recommendation covers the data structure and dual link serial interface for 525/625-line digital signalsas defined in Recommendation ITU-R BT.601-5.
This Recommendation covers the data structure and dual link serial interface for 525/625-line digital signalsas defined in Recommendation ITU-R BT.601-5.
This Recommendation covers the data structure and dual link serial interface for 525/625-line digital signalsas defined in Recommendation ITU-R BT.601-5.
La présente Recommandation indique les prescriptions etles techniques de base applicables aux systèmes d'accès hertzien fixe fonctionnant dans les bandes au-dessous de 3 GHz à utiliser pour l'établissement de connexions hertziennes dans les zones rurales. Ces prescriptions couvrent les aspects de service ainsi que les objectifs de qualité de fonctionnement et de disponibilité. Les Annexes décrivent les caractéristiques techniques et opérationnelles spécifiquement requises pourles applications d'accès hertzien fixe utilisées dans les zones rurales.
Esta Recomendación proporciona los requisitos básicos y las tecnologías para los sistemas de acceso inalámbrico fijo (FWA) que funcionan en bandas por debajo de 3 GHz para su utilización en las conexiones inalámbricas en zonas rurales. Los requisitos incluyen varios aspectos así como objetivos de calidad de funcionamiento/disponibilidad. Los Anexos presentan información técnica y de funcionamiento necesaria específicamente para aplicaciones FWA utilizadas en zonas rurales.
that according to Article 5 of the Radio Regulations (RR) the frequency bands 406.1- 430 MHz and 440-450 MHz are allocated to the fixed service (FS) on a worldwide basis
This Annex describes a digital RF channelling arrangement for the bands 406.1-430 MHz and 440-450 MHz. The arrangements provide some different channelling and capacities uses.
This Annex describes a digital RF channelling arrangement for the bands 406.1-430 MHz and 440-450 MHz. The arrangements provide some different channelling and capacities uses.
This Annex provides typical technical characteristics for the FS using HAPS in the frequency range of 18-32 GHz focusing on the bands 27.5-28.35 GHz and 31-31.3 GHz, which may be used in the relevant studies.
This Annex provides typical technical characteristics for the FS using HAPS in the frequency range of 18-32 GHz focusing on the bands 27.5-28.35 GHz and 31-31.3 GHz, which may be used in the relevant studies.