TABLE OF CONTENT
Instruction manual CM 121
3
TABLE OF CONTENT
IMPORTANT USER INFORMATION.............................................................................................1
TABLE OF CONTENT ...................................................................................................................3
1. INTRODUCTION........................................................................................................................5
2. UNPACKING AND ASSEMBLING............................................................................................7
2.1 CM 121B ..............................................................................................................................7
2.2 CM 121C ..............................................................................................................................9
3. PRINCIPLES & SPECIFICATIONS........................................................................................11
3.1 Theory ................................................................................................................................11
3.2 Construction .......................................................................................................................12
3.3 Specifications .....................................................................................................................12
4. MOUNTING AND ALIGNMENT..............................................................................................14
4.1 Introduction.........................................................................................................................14
4.2 North-south alignment (one time installation).....................................................................14
4.3 Tilting of the sliding bars (one time installation)..................................................................17
4.4 Setting of the shadow ring sliding bars (regular servicing procedure)................................18
5. MEASUREMENT OF THE DIFFUSE SKY RADIATION ........................................................19
5.1. The shadow ring correction ...............................................................................................19
5.3 Diffuse sky radiation on a tilted plane.................................................................................21
6. APPENDIX..............................................................................................................................23
6.1 Theoretical derivation of the correction factor, for uniform sky radiation............................23
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