You should not expect to have to do this very often. The photodiodes and light measurement circuits are very stable.

The source of the apparent variability mentioned above is the not quite ideal cosine and spectral response of the sensors.

Restoring the factory calibration

At any time after carrying out the Recalibrate option you can restore the original factory calibration. You do not have to set up the probe or BFS in uniform light.

♦On the Workabout, simply access the Calibrate procedure (∪ +C) and select

Restore Factory calibration.

You will briefly see a message confirming that this has been done.

Effect of the shade ring on the BFS

If the above matching tests are carried out with the shade ring elevated (but not actually casting a shadow on either BFS sensor), you will get different results.

The shade ring blocks about 7% of the diffuse sky light, and none of the direct beam. In bright sun conditions it will have no significant effect on LAI readings. In completely overcast conditions it might contribute a small error of up to 0.1 to the LAI value.

Comparing the calibration with other PAR sensors

You can carry out matching comparisons between the probe and BFS and any other PAR quantum sensor. You cannot reset the probe values to it, but you can annotate the readings and retain the comparison information in the SunScan data files.

Routine maintenance and cleaning

The probe diffuser is Perspex. Clean it when necessary with a damp cloth, moistened with mild detergent, or with IPA (iso propyl alcohol).

The BFS diffusers are also made of Perspex. Clean them very carefully, especially the groove around the diffusers. Use a fine soft brush to remove any dirt or dust from the groove - it could affect the accuracy of the cosine response of the sensors.

The "spread" measurement

The "spread" value is a measure of the relative variation of the light along the probe. This is a useful parameter in light profiling measurements: it is the value of the standard deviation of the 64 photodiode readings, divided by their mean.

You can check the probe uniformity of calibration at any time by taking a reading in uniform light. The spread value should be 0.00 or 0.01.

52 • Measurement options

Document code: SS1-UM-1.05

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Delta Electronics SS1-UM-1.05 Restoring the factory calibration, Effect of the shade ring on the BFS, Spread measurement
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SS1-UM-1.05 specifications

Delta Electronics has long been recognized for its innovative solutions in power and thermal management technologies. One of its notable products is the SS1-UM-1.05, a compact and efficient power supply module designed to meet the needs of a variety of applications, from industrial automation to telecommunications.

The Delta SS1-UM-1.05 is a key component in the company’s extensive portfolio, providing reliable and stable power supply for both demanding and sensitive electronic equipment. One of the main features of this module is its high efficiency, which typically exceeds 90%. This not only minimizes energy consumption but also reduces heat generation, making it an ideal choice for applications where thermal management is crucial.

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Overall, the Delta SS1-UM-1.05 power supply module is an exemplary solution for those seeking a reliable, efficient, and compact power source. Its advanced features and technologies make it an indispensable component in modern electronic systems.
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