43 research outputs found
The INRIM Role of Inter-laboratory Comparison Provider for Electrical Power and Energy at Industrial Frequency: A Two-Year Activity Report
No full textThe technical surveillance of secondary calibration laboratories accredited according to the ISO/IEC 17025 standard for electrical power and energy at industrial frequency is very important, as these measurements are the basis of the commercial relations between an electricity supplier and a user. An effective technical surveillance requires the execution of inter-laboratory comparisons (ILCs). With them, it is possible to verify the competence of the laboratories and the correctness of the dissemination process from the national standards of power and energy, usually maintained at national metrology institutes (NMI), to these laboratories. The paper deals with the ILCs that the National Institute of Metrological Research (INRIM) provided and carried out as reference measurements provider for Italian accredited laboratories for power and energy (active and reactive) at industrial frequency. The ILCs were carried out involving various instrument types and at different uncertainty levels. The 2 relative uncertainties of the INRIM calibrations ranged from 1.0104 to 1.5103. The ILCs had satisfactory results confirming the correctness of both the dissemination from INRIM and the accreditation process by the Italian accreditation body for calibration laboratories
A Modular Sampling Standard for Quantum Traceable Power Measurements: Comparison and Perspectives
No full textA power frequency modular digital sampling power standard (DSPS) is developed and extensively characterized at the Istituto Nazionale di Ricerca Metrologica (INRiM) for accurate electric power measurement with a relative uncertainty (k = 1) better than 8 mu W/VA. The calibration strategy employed allows to link its key constituents to electrical quantum standards with a relative uncertainty (k = 1) within 3 x 10(-6). Comparison measurements against the national power standard at 53 Hz agree well within the respective measurement uncertainties and did not exceed 10 mu W/VA at 240 V and 5 A and any power factor. The various novelties introduced make the DSPS a versatile metrological grade measurement setup, which lends well to further improvements and accurate evaluation of electrical parameters involved in power quality measurements. This article reports the standard, its traceability chain and calibration strategy, comparison measurements, and uncertainty budget
Recent advancements and perspectives of INRiM’s time-dependent Josephson voltage standards
No full textQuantum sampling modular setup for practical power measurements based on a programmable binary Josephson voltage standard
No full textThe new quantum SI opens the route to link the base unit definitions to fundamental constants of
nature. In the spirit of the quantum SI, a similar traceability route can be implemented for alternating
electrical quantities, such as electrical power. Its implementation is summarized in the present paper
along with the main steps about the realization of a quantum-based sampling power standard carried out
in the framework of the EMPIR project Quantum Power. A programmable Josephson voltage standard
(PJVS) based on a 1-V SNS binary array provides the traceability of the power standard. The PJVS has been
integrated into an existing sampling power standard and its main purpose is the real-time calibration of
high-precision waveform digitizers using a new synchronous quantum power multiplexer (SQPM).
Measurement scenarios and experimental characterization aimed at evaluating the gain and
phase errors of the system constituents, and in particular of SQPM, are presented
Quantum sampling AC standard for electrical power metrology based on programmable Josephson junction series array
No full textDISPOSITIVO DI TERMALIZZAZIONE
No full textÈ descritto un dispositivo di termalizzazione atto al raffreddamento uniforme di almeno un campione dotato di una struttura a strati, tale struttura a strati è composta da almeno una lamina termoconduttiva elettroisolante, almeno una struttura elastica termoconduttiva, almeno un substrato su cui è depositato il campione e almeno un mezzo di supporto
Development of a PJVS System for Quantum-Based Sampled Power Measurements
No full textThe paper deals with recent progresses at INRiM towards the development and characterization of a programmable Josephson voltage standard (PJVS) operating in a small liquid helium dewar as well as with its integration for the realization of a practical quantum sampling electrical power standard. The
PJVS is based on a 1V superconductor-normal metal-superconductor (SNS) binary-divided array of 8192 Josephson junctions. To ensure proper operating conditions of the PJVS chip, a custom short cryoprobe was designed, built and successfully tested. The overall system is being developed in the framework of EMPIR project 19RPT01-QuantumPower. The goal is to establish a new quantum power standard (QPS) based on a single Josephson voltage standard for sampled power measurements and to gain confidence
in running PJVS for precise calibration of digital sampling multimeters and arbitrary waveform digitizers used in the ac-voltage and power metrology community
