| 摘要 |
<p>A weathering apparatus having a light source 50 which irradiates onto specimens located in a specimen supporting wall 46 which is located on a side of a test chamber 44. The output of the light source is controlled by independently adjustable control channels. Each of the control channels include a light source detector e.g. 56c inserted into the test chamber, control circuitry, and ballasts 56a-62a connected to the light sources. The light sources are controlled by the control channels to deliver an output equivalent to a desired set-point. In order to disperse light in an even manner to the specimens, a barrier e.g. 102, 104 is provided which interferes in a predetermined pattern with the passage of light produced by the light sources. The apparatus includes a calibrating device 74 which automatically transfers an irradiance signal from a reference detector selectively positioned immediately adjacent the light source detector. The calibration signal is sent to the controller where the re-calibration of a selected control channel is accomplished. <IMAGE></p> |
