The xenon-arc lamp shall have a continuous spectrum at least over the wavelength range of 250 to 1200 nm, and shall have a similar spectral characteristics to glass-through-sunlight in combination with filter.
4.1.3 Irradiance of test piece surface
Irradiance of test piece surfaces shall be able to be set on any certain value within 48-100W/m2 at least over the wavelength range of 300 to 400 nm.
Also, spectral irradiances of test piece surfaces in the wavelength of 300 to 400nm shall be indicated for each type of test apparatus. Further, the irradiance in other wavelength ranges or the spectral irradiance at s specific wavelength should also be marked upon agreement between the parties concerned. The measuring method is to be in accordance with the annex of JIS B 7754.
4.1.4 Tolerance in irradiance during operation
It shall be capable of maintaining ±10% of the set irradiance.
4.1.5 Tolerance in irradiance of test pieces surfaces
The difference of irradiances of test piece surfaces due to the position must not exceed 10% of the maximum value.
4.1.6 Irradiation method
As a rule, a certain constant irradiance shall be kept continuously during operation.
4.2 Irradiance Adjusting Apparatus
The irradiance adjusting apparatus is an apparatus to correct the attenuation of radiation energy accompanying the use of a xenon-arc lamp and filter, measuring the irradiance in the wavelength of 300 to 400 nm, and shall be provided with one of the following conditions:
1) It shall be capable of manual adjustment of the lamp power to make the irradiance constant.