Patent ID: 8401605

Claim:
A measuring apparatus for determining the amount of at least one substance in blood of a subject, the measuring apparatus comprising: a sensor unit comprising an emitter unit comprising a first plurality of emitter elements configured to emit radiation at a second plurality of wavelengths; and a detector unit configured to receive radiation generated by the emitter elements and transmitted through tissue of a subject, wherein the detector unit is further configured to produce electric measurement signals indicative of absorption caused by blood of the subject; a first memory storing emitter activation information for at least a third plurality of wavelengths, wherein the third plurality of wavelengths belongs to the second plurality of wavelengths, and wherein the emitter activation information indicates, for each wavelength in the third plurality of wavelengths, input terminals of the sensor unit to which the corresponding emitter element is connected; and a monitoring unit configured to process the electric measurement signals, wherein the monitoring unit is further configured to produce, based on the emitter activation information, control information for employing a desired combination of wavelengths selected from the third plurality of wavelengths.