Mass calibration designs for a robotic comparator loading three weights at most

Mass calibration designs for a mass comparator loading three weights at most were searched for a weight series of 10–5–5′–2–2′–1–1′. Under exclusive consideration of Type A variance, the criteria of A-optimality was applied to the designs by minimizing the sum of the variances. A design introduced for the comparator by its manufacturer but not originally intended for the comparator was compared with an A-optimality design that can reduce the average variance by 33%.