Objective 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. Programme(s) FP2-BCR 4 - Research and development programme (EEC) in the field of applied metrology and chemical analysis (Community Bureau of Reference - BCR), 1988-1992 Topic(s) Data not available Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator PHYSIKALISCH-TECHNISCHE BUNDESANSTALT EU contribution No data Address Bundesallee 100 BRAUNSCHWEIG Germany See on map Links Website Opens in new window Total cost No data Participants (7) Sort alphabetically Sort by EU Contribution Expand all Collapse all Elektronik Centralen Denmark EU contribution No data Address See on map Total cost No data Institute for Industrial Research and Standards Ireland EU contribution No data Address See on map Total cost No data Istituto Elettrotecnico Nazionale 'Galileo Ferraris' Italy EU contribution No data Address See on map Total cost No data Laboratoire Central des Industries Electriques France EU contribution No data Address 33 avenue du Général Leclerc 92260 Fontenay-aux-Roses See on map Total cost No data Ministere des Affaires Economiques Belgium EU contribution No data Address See on map Total cost No data National Physical Laboratory (NPL) United Kingdom EU contribution No data Address Queen's Road TW11 0LW Teddington See on map Total cost No data Van Swindon Laboratorium Netherlands EU contribution No data Address See on map Total cost No data