From the measured values there were set the calibration
constants (the measured value multiplied by the constant) for
particular prototypes. It was: the individual calibration constant
(an individual constant for each prototype) or the type
calibration constant (the same for all pieces). The final errors
after conversion are shown in Figs. 8 and 9. The maximum
error in was 11.9 % the conversion by the individual constant
and 13.9 % in the conversion by the type constant. In both
cases an incandescent lamp was a light source.