Abstract: A measuring apparatus that measures a characteristic of a transfer circuit includes: an electrical signal sending section that transmits a sending signal; a current to light converting section that converts the sending signal into an optical signal; an optical signal transmitting section that transmits the optical signal; a photo-electric converting circuit tat converts the optical signal into an electrical signal; a level measuring section that compares the intensity of the electrical signal output from said photo-electric converting circuit and a predetermined reference level to detect a data value of the electrical signal; an electrical signal receiving section that detects a data value of the electrical signal; and a timing controlling section that controls latch timing at which said electrical signal receiving section detects the data value of the electrical signal.

Abstract: The invention provides an apparatus for measuring a hue of a predetermined primary color included in light reflected from a surface. The apparatus has a diffuse light source for creating incident light comprising a plurality of primary colors including the predetermined primary color, the incident light being directed onto the surface. The incident light is reflected from the surface to produce the reflected light. The apparatus also has a photometer for receiving and analyzing the reflected light to provide objective chromaticity data representing the hue of the predetermined primary color, and a scale adapted for converting the objective chromaticity data to a clinical score measuring the hue of the predetermined primary color in the reflected light.