IEC 60904-10:20 20描述了用于测量光伏(PV)设备的任何电参数(Y)相对于测试参数(X)的依赖性并确定该依赖性接近理想线性(直线)函数的程度的程序。它还就如何考虑与理想线性相关性的偏差以及一般如何处理光伏器件电参数的非线性给出了指导。 这第三版取消并取代了2009年出版的第二版。与上一版相比，此版本包括以下重大技术变更: a.标题的修改。 b.包括对这些变化及其背后的推理的介绍性解释。 c.纳入新条款术语和定义（第3条），区分一般线性依赖和短线性依赖-电路电流与辐照度（线性）。 d.等效样品的明确定义（条款4）。 e.设备（条款5）、测量程序（条款6至条款8）和数据分析（条款9）的技术修订，将一般线性相关性的数据分析与线性（即短路电流对辐照度的依赖性）评估的特定数据分析分开。此外，纳入光谱效应对线性和线性相关性评估的影响。 f.引入双灯法的具体数据分析，使其完全定量。增加了称为N-lamp方法的扩展版本。 g.修改线性评估标准，纳入可用于校正PV参比器械非辐照度读数的公式其短路电流对辐照度的线性。为此专门新定义了线性因子。 h.修订报告要求（第10条），以更清楚地了解哪些信息始终是必要的，哪些信息取决于测量线性相关性实际遵循的程序，包括测量的相关性类型（一般或线性）。

IEC 60904-10:2020 describes the procedures used to measure the dependence of any electrical parameter (Y) of a photovoltaic (PV) device with respect to a test parameter (X) and to determine the degree at which this dependence is close to an ideal linear (straight-line) function. It also gives guidance on how to consider deviations from the ideal linear dependence and in general on how to deal with non-linearities of PV device electrical parameters.
This third edition cancels and replaces the second edition published in 2009. This edition includes the following significant technical changes with respect to the previous edition:
a. Modification of title.
b. Inclusion of an Introduction explanatory of the changes and the reasoning behind them.
c. Inclusion of a new Clause Terms and Definitions (Clause 3), with distinction between generic linear dependence and linear dependence of short-circuit current versus irradiance (linearity).
d. Explicit definition of equivalent sample (Clause 4).
e. Technical revision of the apparatus (Clause 5), of the measurement procedures (Clause 6 to Clause 8) and of the data analysis (Clause 9), with separation of the data analysis for a generic linear dependence from the data analysis specific to linearity (i.e. short-circuit current dependence on irradiance) assessment. Additionally, inclusion of impact of spectral effects on both linearity and linear dependence assessment.
f. Introduction of specific data analysis for two-lamp method, making it fully quantitative. Addition of extended version called N-lamp method.
g. Modification of the linearity assessment criterion with inclusion of a formula that can be used to correct the irradiance reading of a PV reference device for non-linearity of its short-circuit current versus irradiance. A linearity factor is specifically newly defined for this purpose.
h. Revision of the requirements for the report (Clause 10) in order to improve clearness about what information is always necessary and what is dependent on the procedure actually followed to measure the linear dependence, including the type of dependence measured (generic or linearity).