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11.
MAKING MEASUREMENTS
Before making measurements, make sure that the pyranometer and the temperature probe have been connected, as
follows:
PYRANOMETER:
the pyranometer must be placed on the same level as the modules to be tested; also make sure
that there are no shadows.
Attach the pyranometer directly to the PV module frame or to the main structure using the metallic accessory supplied
with the pyranometer (take care to avoid further shade by improper positioning of the pyranometer).
Make sure the angle between the sun’s ray and the module’s surface is as close as possible to 90°, the ideal angle for
obtaining excellent reliable results. If need be repeat the measurements at other times of the day.
Plug the connector directly into the instrument or the Remote Unit (if used).
AMBIENT TEMPERATURE PROBE:
the temperature probe must be placed in a shaded area that is adequately
ventilated and near the modules.
Plug the connector directly into the instrument or the Remote Unit (if used).
PANEL TEMPERATURE PROBE:
the temperature probe must be positioned on the back of the panel aligned to a
cell; if you are measuring a string of panels, place the probe on a panel in the middle of the string.
Plug the connector directly into the instrument or the Remote Unit (if used).
11.1.
Electrical connections:
The inputs for the V-DC voltage and I-DC current measurements are on the front panel.
Connect cables in parallel from the positive terminals of the instrument to the positive terminal of the panel or string and
from the negative terminals of the instrument to the negative terminal of the panel or string. This 4-wire connection
makes the voltage and current measurements of the panel or string independent and more accurate.
ATTENTION
: use only the cables supplied for the electrical connections or, possibly, cables with suitable characteristics
and certifications.
If the measurement connection is made using cables other than those supplied, use cables that are as short as
possible.
Example of electrical connections without remote unit
Example of electrical connections with remote unit
