Calculating the total irradiance ratio
Place the photometer head in parallel to the plane of the item which is being measured. See to it that
the shadow of the operator who conducts the measurement does not cast itself onto the photohead
window, as well as the shadow of any irrelevant objects that are temporarily present.
In this mode the device is installed on the bench so that on the zero range the maximum signal might
be obtained in the area of
3,900
…
4,000
units. The position on the bench is fixed, the photohead re-
moved. Then, in the fixed point reference receivers determine irradiance in the wavelength range 220
… 400 nm (zones А, В, С). After that, the photohead returns to the reference point, and the irradiance
value is entered into the entry field, and the total irradiance ratio calculated.
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