Hi,
The "short circuit current" (measured across a low-valued resistor) should vary linearly with the watts/m2 illumination. The line should pass through the origin (0 / 0) so in principle you only need to take one calibration reference point against a "known" source. But more points (on a straight line) will confirm whether your hardware is working properly.
Of course it becomes much more complex if you want to achieve "accurate" pyranometric measurements.
Cheers, Alan.
The "short circuit current" (measured across a low-valued resistor) should vary linearly with the watts/m2 illumination. The line should pass through the origin (0 / 0) so in principle you only need to take one calibration reference point against a "known" source. But more points (on a straight line) will confirm whether your hardware is working properly.
Of course it becomes much more complex if you want to achieve "accurate" pyranometric measurements.
Cheers, Alan.