Kipp&Zonen CFR Calibration Facility - Manual (Page 5)

CFR manual
4
Table of contents
IMPORTANT USER INFORMATION ............................................................................................................. 1
Declaration of Conformity ............................................................................................................................... 3
Table of contents ............................................................................................................................................ 4
1 Introduction .......................................................................................................................................... 5
2 Installation and operation ..................................................................................................................... 6
2.1 Delivery ................................................................................................................................................ 6
2.2 Installation ............................................................................................................................................ 7
2.2.1 Environmental conditions ................................................................................................................. 7
2.2.2 Mechanical and electrical set-up ...................................................................................................... 7
2.3 Maintenance ...................................................................................................................................... 10
2.3.1 Lamp .............................................................................................................................................. 10
2.3.2 Maintenance and recalibration of the reference pyranometer ........................................................ 10
2.3.3 Spare Parts Specification ............................................................................................................... 12
3 Calibration operation .......................................................................................................................... 13
3.1 Description of the procedure .............................................................................................................. 13
3.2 Description of the procedure step-by-step ......................................................................................... 15
3.3 Calibration uncertainty ....................................................................................................................... 16
3.3.1 Instability of the lamp output power ................................................................................................ 16
3.3.2 Pyranometer offsets ....................................................................................................................... 16
3.3.3 Voltmeter offset .............................................................................................................................. 17
3.3.4 Tilting of the pyranometers ............................................................................................................. 17
3.3.5 Differences in sensor height and geometry .................................................................................... 17
3.3.6 Calibration repeatability and overall uncertainty ............................................................................. 17
3.4 Calibration Form ................................................................................................................................ 18
4 Principle components and specifications of the facility ...................................................................... 19
4.1 Table .................................................................................................................................................. 19
4.2 Turntable ............................................................................................................................................ 19
4.3 Shading mechanism .......................................................................................................................... 20
4.4 Lamp mounting pillar ......................................................................................................................... 20
4.5 Lamp housing .................................................................................................................................... 20
4.5.1 115VAC/60 Hz Calibration Facility ................................................................................................. 20
4.5.2 230VAC/50 Hz Calibration Facility ................................................................................................. 20
4.6 Lamp bulb .......................................................................................................................................... 20
4.7 Voltage Stabilization .......................................................................................................................... 21
4.8 Voltmeter ........................................................................................................................................... 21
4.9 Switch and clamps ............................................................................................................................. 21
4.10 Reference pyranometer .................................................................................................................. 21
4.11 Mountings for other radiometers .................................................................................................... 22
4.12 Stopwatch ...................................................................................................................................... 22
5 Frequently asked questions ............................................................................................................... 23
Appendix I: Calibration Form for pyranometers .......................................................................................... 24
Appendix II: Pyranometer Classification According to WMO Guide 1996 ................................................... 25
Appendix III: List of World and Regional Radiation Centres ......................................................................... 26
Appendix IV:Recalibration service ................................................................................................................ 27