Abstract
It is shown that the current of a pyranometer can be made independent of temperature by connecting a resistor of appropriate characteristics in series with the pyranometer. The temperature coefficient of the pyranometer with respect to the electromotive force should be made equal to the temperature coefficient of the resistance of the circuit. A resistor with a semilinear temperature characteristic and a negative temperature coefficient can be constructed by connecting a N.T.C. (Negative Temperature Coefficient) resistor in parallel with a resistor of constant resistance. A complete calculation is carried out for a case where the pyranometer is a Moll-Gorczynski solarimeter and the instrument indicating the current is a potentiometer. It turns out that the temperature influence on the radiation measurement can be almost eliminated.
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