which measurement mode did you use? Since you show measurement data down to 200 nm the measurement mode without stray light correction must be used. There are several measureemnt modes provided in the meter. Some without filters for fast measurements as this one down to 200 nm, however low stray light reduction. The ones with stray light reduction based on bandpass filter stray light reduction methods delivers data only down to 280 nm. This mode is called solar BP measurement mode. Only this measurement mode used for solar measurements with the high spectral stray light reduction.
I can just recommend to use this methode for solar measurement. This is shown in many papers, see:
Hence the comparison what you performed is based on data with a not suited measurement mode for solar measurements. Do you may want to repeat this measurement with the suited mode?
I'm happy to discuss your measurement results direclty.
Dear Mr. McKenzie,
which measurement mode did you use? Since you show measurement data down to 200 nm the measurement mode without stray light correction must be used. There are several measureemnt modes provided in the meter. Some without filters for fast measurements as this one down to 200 nm, however low stray light reduction. The ones with stray light reduction based on bandpass filter stray light reduction methods delivers data only down to 280 nm. This mode is called solar BP measurement mode. Only this measurement mode used for solar measurements with the high spectral stray light reduction.
I can just recommend to use this methode for solar measurement. This is shown in many papers, see:
DOI 10.1088/1361-6501/aada34
https://doi.org/10.5194/amt-11-2477-2018
https://doi.org/10.5194/amt-14-4915-2021
Hence the comparison what you performed is based on data with a not suited measurement mode for solar measurements. Do you may want to repeat this measurement with the suited mode?
I'm happy to discuss your measurement results direclty.