The Solar Cell Tester measures current-voltage (I-V) characteristics. Its high resolution also permits testing of very small area devices. Separate current and voltage probes on the solar panel provide I-V measurements. A programmable electronic load varies the resistance across the cell to measure its I-V characteristics. By adjusting the lamp intensity, controls the measurement process, and acquires cell performance data. The measured data will be displayed in the LCD which is like an inverse exponential curve. When the open voltage is maximum, the current will be zero. At the maximum load current the voltage will be zero.
The voltage will measure through potential transformer connected and the current is measured through current sensor which outputs are given to ADC. The ADC output is processed through microcontroller and displayed in the LCD. Through the DAC output we can vary the load that means light intensity is varied through DAC. These all are done automatically