Kipp&Zonen CFR Calibration Facility - Manual (Page 20)

CFR manual
19
4 Principle components and specifications of the facility
The Calibration Facility consists of a number of parts. These are described in the following paragraphs.
4.1 Table
The table serves for mounting the lamp, the turntable, the voltage stabilizer (230 VAC version) and the
shading mechanism. Additionally, it can serve as a worktable and has clamps for connecting the reference
pyranometer signal wires, the test pyranometer signal wires and the voltage meter wires. During
calibration, the voltmeter is used alternately to measure both the reference pyranometer signal and the test
pyranometer signal.
In order to reduce light reflections, the table has a gray finish.
4.2 Turntable
The turntable serves for mounting the test pyranometer and the reference pyranometer. By rotating the
turntable, the positions of these two can be precisely interchanged.
The two available positions are called position 1 and 2. In position 1, the reference is at the left, as seen
standing in front of the Calibration Facility. In position 2, the reference is at the right.
The interchange of position during calibration is necessary because the light coming from the lamp is not
uniformly distributed across the surface in which the pyranometers are positioned.
In its standard form, the turntable is suitable for
installation of Kipp & Zonen pyranometers models
CM 6B, 11, 11B, 21, 22 and 31 and the successor
models CMP 6, CMP 11, CMP 21 and CMP 22.
Note: there is only one position in which the
pyranometers are properly supported by the
turntable pillars.
In order to change the voltmeter input signal from
the test pyranometer to the reference pyranometer,
a switch is incorporated in the turntable base.
For calibration of other Kipp & Zonen radiometers,
or pyranometers from other manufactures, a range
of adaptors is available.
figure 9 Turntable with reference pyranometer