There are several commercial systems for testing PV modules under field conditions but they are expensive. This paper presents a design and implementation of a simple, low cost and high efficient data acquisition system for testing the photovoltaic modules under different operating conditions (different solar radiation levels and surface temperatures). It has been designed to be the laboratory basic element for the photovoltaic generators characterization. This data acquisition system is designed to acquire and then records the signals from the different sensors that are used for measuring the different parameters of the PV system. These measurements of the different parameter include the incident solar radiation on the PV module, PV module surface temperature, load voltage, and load current. These parameters are measured via physical sensors and transducers and recorded using Analog-Digital (AD) card driven by a PC.