11. APPENDIX
11.1. THEORETICAL ASPECTS OF THE I-V CURVE MEASUREMENT
The instrument is designed to perform tests and measurements on PV modules
consisting of a suitable number of PV cells in order to determine their I-V (Current-Voltage)
characteristic, which identifies them constructively, based on the reference standard
IEC/EN60891
Tests can be performed either on individual modules or on a PV string (a set of PV
modules), the set of which forms what is commonly known as a “PV generator”, which is
an integral part of a Single-phase or Three-phase PV installation
11.1.1. Theoretical Aspects of I-V Curve measurement
The I-V curve test is performed as described below:
• The meter performs the I-V curve measurement of the PV module connected to it,
further to the real time measurement of irradiance and module temperature
• The measurement result is automatically "translated" to the Irradiance Standard Test
Condition (STC) equal to 1000W/m
2
and module temperature equal to 25°C. In order to
obtain accurate results in accordance with this manual, it is recommended that the
specifications in § 10.1
• The instrument makes a comparison between the maximum rated power, with the
percentage tolerance margin declared by the module manufacturer and included in the
database for the module type selected on the meter (§ 6.3.1), and the measured value
• If the comparison is within the declared tolerance, the final result of the test will be "OK";
if not, the result will be "NOT OK" and the module will therefore not meet the
specifications declared by the manufacturer (§ 6.4.4)
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