Kipp&Zonen CFR Calibration Facility - Manual (Page 16)

CFR manual
15
3.2 Description of the procedure step-by-step
1. Switch on the lamp and the voltmeter.
2. Place the reference and test pyranometers in the calibration room, outside the lamplight, in order to
let their temperatures stabilize. Allow 2 hours for the test pyranometer to stabilize if it has been
outdoors.
3. Allow 20 minutes for the lamp to stabilize.
4. Put a test pyranometer and the reference in position marked with
reference. Check that the detector surface heights are the
same.
5. Darken the pyranometers with the shading mechanism and wait 2
minutes.
6. Expose the pyranometers to light.
7. After exactly one minute note the outputs of the reference and test
pyranometers. Write them down on the calibration form.
8. Darken the pyranometers.
9. Exactly one minute after darkening, note the outputs of the
reference and test pyranometers. Write them down on the
calibration form.
10. Rotate the turntable so that the pyranometers are in opposite
position, in the dark.
11. Expose the pyranometers to the light.
12. After exactly one minute note the outputs of the reference and test
pyranometers. Write them down on the calibration form.
13. Darken the pyranometers.
14. Exactly one minute after darkening, note the outputs of the
reference and test pyranometers. Write them down on the
calibration form.
15. Calculate the calibration factor according to the procedure that is
described on the calibration form.
16. Check if the lamp stability has been sufficient, according to the
procedure that is described on the calibration form.
17. For multiple calibrations start again at step 4.
figure 8 Different positions of the turntable
and shutter during the calibration procedure