Delta-T SPN1 User Manual
Also see for SPN1: Technical note
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Contents
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The value of RATIO is 1.35 for a standard SPN1 with a 120 W.m-2 direct beamthreshold, and 1.55 for the MeteoSwiss variant of the SPN1 which has a 200 W.m-2direct beam threshold. The 24 W.m-2 value cuts out times when the radiation is solow that there cannot be any direct sunshine, but the TOTAL/DIFFUSE value may behigh due to noise or offsets dominating the low reading values.Test resultsSPN1 output0100200300400500600700800900100005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0027 April 2006Reading in W.m-2CM6 TotCM6 DiffSPN1 TotSPN1 DiffThis graph shows a typical daily output from the SPN1. It is plotted against two KippCM6 pyranometers, one shaded by a disk on a solar tracking arm. This day startedovercast, with cloud breaking up during the middle of the day, followed by a cloudlessevening.34 z Appendix A: Design and test summary SPN1 User Manual v1.0 |
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