A CNR4 on a CR1000x. The logger outputs a net radiation value that is, according to the program,
RnAs = (LWin - LWout) + (SWin - SWout)
We are also logging those four components individually. When I do a manual calculation, for example in a database query
SELECT (LWin - LWout) + (SWin - SWout) as net_calc, RnAs as net_logger FROM data.Cr1000x
I would expect to get the same, or very similar values (rounding...). But the values differ quite a bit, just some random sample data:
net_calc net_logger
249.60479999999998 249.8723
245.78705999999997 247.8013
240.75883999999996 242.7817
237.44592999999998 238.6025
The differences can be much smaller/nonexistent for periods, but also larger than this at times. The calculation is in a slow sequence of the logger program. Can that be the reason?