Title :
Investigation into the effect of loading on the NIS primary group of standard resistors
Author :
Tadros, Nadia N.
Author_Institution :
Nat. Inst. of Stand., El Haram, Egypt
Abstract :
The effect of loading on the performance of the primary group of standard resistors maintaining the ohm at NIS has been investigated at 23°C, the same temperature as the laboratory. For this reason the temperature coefficients of resistance (TCR) have been evaluated at 23°C. The values of α´s are almost half of those evaluated in 1990 by the BIPM, whereas the β values are about the same. The NIS primary resistances standard is shown to reach its steady state value of load correction after about 15 minutes of application of the load. A load coefficient of resistor of ~0.2 ppm/mw was deduced for these resistors
Keywords :
electric resistance measurement; measurement standards; 23 degC; NIS primary group; load correction; loading effects; standard resistors; temperature coefficients of resistance; Bridges; Electric resistance; Electrical resistance measurement; Hall effect; Laboratories; Performance evaluation; Power measurement; Resistors; Steady-state; Temperature;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1998. IMTC/98. Conference Proceedings. IEEE
Conference_Location :
St. Paul, MN
Print_ISBN :
0-7803-4797-8
DOI :
10.1109/IMTC.1998.676956
