PTB�s Time and Frequency Services 2017

Piester, D.; Bauch, A.; Becker, Jürgen; Polewka, T.; Riedel, Franziska; Sibold, Dieter; Staliuniene, Egle; Teichel, Kristof; Vajen, Wilfried

doi:10.33012/2018.15602

Cited by 3 publications

(2 citation statements)

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“…This device is capable of detailed real-time measurements and recording of air temperature and relative humidity. Time accuracy of the data logger is ensured by an in-built radio receiver, which receives signal from longwave time signal and standard-frequency radio station DCF77 in Mainflingen, Germany (near Frankfurt am Main), [4].…”

Section: Methods and Equipmentmentioning

confidence: 99%

Influence of Orientation of Building on Indoor Conditions in a Roof Truss

Sibilla

Vlček

Struhala

et al. 2016

AMM

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Protection of historical roof trusses is an important part of efforts to protect our cultural heritage. These timber structures carry a lot of information about used tools, technologies or construction processes. Roof trusses are generally threatened by many dangers, which could cause irreparable damage and loss of the carried information. Wood destroying insects and fungi are the gravest threat to historical roof trusses in our climatic conditions. Their spreading depends on several specific (interior) conditions. These include critical moisture content in the wood, relative humidity, amount of natural light and ventilation. In addition to these commonly monitored parameters (and their critical levels) we also must not forget the influence of local geography, biotope or orientation to the cardinal. This paper describes temporal fluctuations of some of the mentioned physical parameters in a historical roof truss with regard to external climatic conditions and orientation to the cardinal.

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Section: Methods and Equipmentmentioning

confidence: 99%

Influence of Orientation of Building on Indoor Conditions in a Roof Truss

Sibilla

Vlček

Struhala

et al. 2016

AMM

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“…the European Galileo Satellite System [29] or the traditional (and regional) low frequency transmitters, e.g. the German DCF77 [30]. Users of such signals can rely on the fact that these time signals are monitored continuously by national authorities, which are National Metrology Institutes, like the PTB in Germany, or so-called Designated Institutes in some countries.…”

Section: Architecture For Traceable Frequency Measurementsmentioning

confidence: 99%

Traceable frequency measurements with counters

Piester,

Staliuniene,

Bauch

2024

Meas. Sci. Technol.

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Received signals from Global Navigation Satellite Systems (GNSS) are nowadays widely used by industry laboratories for ensuring metrological traceability for their respective range of calibration services in the field of time and frequency. Usually, a local frequency standard is steered by continuous GNSS signal reception providing at its output stable and accurate reference signals for the laboratory measurement equipment, in general for synthesizers and counters. Reception of GNSS signals is surely an adequate and practical tool for the purpose, however further steps are needed to establish traceability in a strict metrological sense. Based on already available guidelines and publications, this paper is a contribution to the discussion how metrological traceability to internationally accepted standards can be established in a calibration laboratory. We restrict the discussion to equipment in common use which may not necessarily be of the highest sophistication. In this spirit, we develop a detailed scheme for an uncertainty budget comprising all links of the traceability chain from the device under test to the SI second, the scale-unit of Coordinated Universal Time. Then we go through and apply this scheme step by step to a demonstration setup for frequency measurements with a counter with varying operational parameters. In this framework, a novel approach to distinguish between components of statistical measurement uncertainty is introduced. Furthermore, the limiting uncertainty contributions are discussed and based on a suitable set of parameters an expression for the best measurement capability is given. With this scheme at hand a user may develop an uncertainty budget adapted to his own setup, especially if acceptance from a national accreditation body is sought.

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