The National Institute of Standards and Technology (NIST) maintains the United States' primary standards for traceable RF and mm-wave power measurements. In the 2.4 mm connector type, the specialized sensors that NIST currently uses as primary standards are not commercially available, which raises concerns about the long-term sustainability of NIST's measurement capabilities. These concerns motivated us to explore the option of using commercially available thermoelectric power sensors. In this paper, we describe a power metering procedure and a preliminary uncertainty analysis for a power sensor that could be used for traceable RF power measurements. With our metering procedure we see good metered power linearity up to about 17 mW of RF power, weak temperature dependence, and an overall fractional measurement uncertainty of about 0.10\% (k = 1).

As a National Metrology Institute (NMI), the National Institute of Standards and Technology (NIST) maintains traceable measurement capabilities for a variety of quantities, including microwave power. At NMIs and calibration laboratories, traceable microwave power measurements often rely on the principle of dc substitution. This approach involves a power meter that provides dc power to a sensor under test. DC substitution power meters are typically implemented by analog electronics, making them difficult to maintain. Here, we explore programmable source measure units as an alternative implementation of the power meter. We offer a preliminary uncertainty analysis and describe a method to reduce measurement uncertainty due to the accuracy of the measurement equipment. This is data for the manuscript "Using Commercial Source Measure Units for Traceable RF Power Measurements" for the 2024 ARFTG conference.

After recently completing a five year renovation, the NIST anechoic chamber for radio-frequency field strength measurements was returned to service. Tests of field probe transfer functions can now be performed from 10 kHz to 40 GHz. To validate that the chamber and measurement process maintained continuity, measurements of NIST field probes in the new chamber were compared with measurements in the chamber before renovation and in another test facility at NIST. An uncertainty analysis was carried out on the new measurement process.

After recently completing a five year renovation, the NIST anechoic chamber for radio-frequency field strength measurements was returned to service. Tests of field probe transfer functions can now be performed from 10 kHz to 40 GHz. To validate that the chamber and measurement process maintained continuity, measurements of NIST field probes in the new chamber were compared with measurements in the chamber before renovation and in another test facility at NIST. An uncertainty analysis was carried out on the new measurement process.

요청하신 원격검침기 설치현황을 공공데이터포털에 개방하였습니다.현재 공사진행 중으로 추후 수량변경이 있을 수 있음을 알려드립니다.

한전원자력연료(KNF)의 교정 활동 정보로 측정량/장비, 분류번호, 측정범위, 현장교정가능여부를 제공합니다.

The ThermoData Engine fully implements all major principles of the concept of dynamic data evaluation formulated at NIST?s Thermodynamics Research Center (TRC). Dynamic data evaluation relies on large electronic databases to store the currently known experimental data along with detailed descriptions of relevant metadata and uncertainties. Combining this data with expert software allows the ThermoData Engine to producing data compilations 'to order' which include all major thermophysical properties (such as density, vapor pressure, heat capacity, enthalpies of phase transitions, critical properties, melting and boiling points, etc). As the name of this resource implies, its scope is pure compounds, binary mixtures and reactions. If you are only interested in pure compounds please see NIST ThermoData Engine - Pure Compounds - SRD 103a (https://www.nist.gov/srd/nist-standard-reference-database-103a).

This web application provides free and open access to literature information contained in the NIST SOURCE Data Archive, and provides an easy-to-use tool for generation of a NIST Literature Report in PDF format, as required by the Journals. The tool is intended to aid researchers and reviewers in determining relevant literature sources for a given experimental measurement; however, it is not intended to replace the comprehensive literature review required by all journals, and no guarantee is made regarding completeness of the information provided. For an analysis of the comparative impact a particular measurement may have, the ThermoPlan: Experimental Planning and Coverage Evaluation Aid for Thermophysical Property Measurements web tool (http://trc.nist.gov/thermoplan/) is recommended.

This web application provides free and open access for the broader research community to the experimental planning utilities that are incorporated into ThermoData Engine (TDE) [J. Chem. Inf. Model. 2005, 45, 816-838]. TDE provides recommendations for the relative merit of a proposed measurement via assessment of the existing body of knowledge, including availability of experimental thermophysical property data, variable ranges studied, associated uncertainties, state of prediction methods, and parameters for deployment of prediction methods. The web applications provides utilities for the assessment of specific property measurements for pure and binary chemical systems, the broader data needs of pure systems, and recommendations for binary mixture measurements that could extend the current UNIFAC model. The primary focus of this recommendation service is molecular organic compounds. Some common inorganic and organometallic compounds are included, but, in general, polymers, radicals, ions, salt and acid solutions, metals, metal oxides, and inter-metallics are not considered. References NIST Standard Reference Data 103a and 103b.

,System SI2PEM gromadzi i udostępnia dane na temat stacji bazowych telefonii komórkowej (SBTK), wyniki pomiarów oraz wyniki symulacji rozkładu pól elektromagnetycznych na terenie Polski. Dostępne są również informacje o zgłoszeniach instalacji wytwarzających pola elektromagnetyczne. Dane dostarczane są przez operatorów telefonii komórkowych, laboratoria akredytowane, Wojewódzkie Inspektoraty Ochrony Środowiska, Główny Inspektorat Ochrony Środowiska oraz Organy Ochrony Środowiska.,Udostępniane dane to m.in.:,