Maintenance of the Unit of Resistance at KFUPM Research Institute PDF

Keywords

resistors, KFUPM Research Institute, resistance

Abstract

The paper presents a technique of maintaining and calibrating similar and non-similar standard resistors based on double ratio set using one reference standard only. This technique is further applied in matrix method of calibrating a group of similar resistors 10 yield heter precision in values and maintain the unit of resistance at KFUPM Research Institute. A group of standard resistors of values 1 Ohm, 1k Ohms and 10k Ohms were calibrated and the results compared with the determinations made through direct substitution method using double ratio set which requires two resistance standards with one as the reference. Performance of calibration is also checked on the basis of closeness between calibrated values of a standard resistor, obtained through use of similar type of standards as reference. The stability requirement of less than 1 ppm/year is achieved.