How important is it to keep the sun photometer from getting hot or cold while Im taking measurements?
The LED detector in your sun photometer is temperature-sensitive, so its output is slightly influenced by its temperature. Therefore, it is very important to protect your instrument from getting too hot in the summer or too cold in the winter. In the summer, it is essential to keep the instrument case out of direct sunlight when you are not actually taking a measurement. In the winter, it is essential to keep the instrument warm — you can tuck it under your coat between measurements. Never leave your sun photometer outside for extended periods of time. The sun photometer case itself provides some protection from temperature changes that can affect the electronics inside. (This is why newer GLOBE sun photometers have a built-in temperature sensor to monitor the air temperature inside the case, near the detectors.) If you follow these precautions and take your measurements as quickly as possible, then your measurements will be acceptable. In extreme conditions (winter or summer), you sho
