Obiettivo The primary volt is derived at present from Josephson Junctions and maintained in the metrology laboratories with Weston Cells. The transfer of the volt eg to industrial calibration laboratories is done by means of digital voltmeters which provide an accuracy of about 10 ppm. Recent solid state voltage standards using Zener diodes appeared to be able to transfer and maintain the volt with an accuracy of the order of 1 ppm or better over one year. The objective of the project was to investigate how such a solid state standard would behave when transported from one metrology laboratory to another for an intercomparison. Three instruments are being circulated amongst the metrology laboratories for calibration at 1 V and at 10 V. RESULTS For intercomparison measurements three sources of two different types have been circulated: 1. Fluke model 732 with the output of 10 V, 1.018 V and 1 V. 2. Cropico VSIO, with the output of 10 V. 3. Cropico ECSI, with the output of 1.018 V and 1 V. The laboratories agreed in their measurements to within +/- 1 x 1E-6. The long term stability analysis performed by the pilot laboratory (PTB) over a longer period (5 years) has shown for all sources a linear drift with time of a few parts in 1E-6. Programma(i) FP2-BCR 4 - Research and development programme (EEC) in the field of applied metrology and chemical analysis (Community Bureau of Reference - BCR), 1988-1992 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore PHYSIKALISCH-TECHNISCHE BUNDESANSTALT Contributo UE Nessun dato Indirizzo Bundesallee 100 BRAUNSCHWEIG Germania Mostra sulla mappa Collegamenti Sito web Opens in new window Costo totale Nessun dato Partecipanti (7) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Elektronik Centralen Danimarca Contributo UE Nessun dato Indirizzo Mostra sulla mappa Costo totale Nessun dato Institute for Industrial Research and Standards Irlanda Contributo UE Nessun dato Indirizzo Mostra sulla mappa Costo totale Nessun dato Istituto Elettrotecnico Nazionale 'Galileo Ferraris' Italia Contributo UE Nessun dato Indirizzo Mostra sulla mappa Costo totale Nessun dato Laboratoire Central des Industries Electriques Francia Contributo UE Nessun dato Indirizzo 33 avenue du Général Leclerc 92260 Fontenay-aux-Roses Mostra sulla mappa Costo totale Nessun dato Ministere des Affaires Economiques Belgio Contributo UE Nessun dato Indirizzo Mostra sulla mappa Costo totale Nessun dato National Physical Laboratory (NPL) Regno Unito Contributo UE Nessun dato Indirizzo Queen's Road TW11 0LW Teddington Mostra sulla mappa Costo totale Nessun dato Van Swindon Laboratorium Paesi Bassi Contributo UE Nessun dato Indirizzo Mostra sulla mappa Costo totale Nessun dato
