Title :
Change of the working temperature of the IEN primary group of standard resistors
Author :
Boella, Giorgio ; Reedtz, Giancarlo Marullo
Author_Institution :
Ist. Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy
fDate :
4/1/1997 12:00:00 AM
Abstract :
To improve the temperature stability of the IEN primary group of standard resistors, their working temperature has been increased from 20°C to 23°C, the same value as the temperature of the laboratory. The experimental procedure adopted for this change is described. The behavior of the resistors with time, both before and after the change, has been monitored by comparison with the quantum Hall effect and is also reported. Before the change the resistors show a linear drift with perturbations due to transport. The temperature change causes the resistors to drift exponentially with mean time constant of about 0.6 years. After three years not all the standards seem to be recovering their original drift rate
Keywords :
electric resistance measurement; measurement standards; quantum Hall effect; resistors; stability; 20 to 23 C; IEN primary group; drift rate; linear drift; mean time constant; perturbations; primary standards; quantum Hall effect; resistance measurement; standard resistors; temperature change; temperature coefficient; temperature stability; working temperature; Bridges; Electrical resistance measurement; Hall effect; Laboratories; Measurement standards; Petroleum; Resistors; Temperature; Thermal stability; Uncertainty;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
