‌I-V curve testing‌ is a method to evaluate the electrical performance of electronic devices by measuring their current response under varying voltages and plotting the current-voltage (I-V) relationship. Below are the general testing steps applicable to photovoltaic modules and semiconductor devices:
 

1. Test Preparation

  1. ‌Equipment Selection‌: Use a dedicated IV tester (e.g.,Yoha Solar's Panel IV Tester ,Fluke I-V Analyzer) or a solar array analyzer (e.g., Fluke PVA-1500).
  2. ‌Environmental Requirements‌:
    1. For photovoltaic testing, ensure stable illumination (typically using a solar simulator or clear outdoor conditions).
    2. For semiconductor testing, maintain a constant temperature and interference-free laboratory environment.
  3. ‌Circuit Connection‌:
    1. Correctly connect the device under test (e.g., solar panel, MOSFET) to the testing system.
    2. Ensure proper polarity to avoid short circuits.
 

2. Test Procedure

  1. ‌Parameter Setup‌:
    1. Set the voltage sweep range (from 0V to slightly above the open-circuit voltage, Voc).
    2. Define the voltage step size and sampling frequency to ensure data accuracy.
  2. ‌Sweep Execution‌:
    1. The tester automatically applies incremental voltage and records the corresponding current.
    2. For three-terminal devices like MOSFETs, fix the gate voltage (VG), sweep the drain voltage (VD), and measure the drain current (ID).
  3. ‌Data Acquisition and Plotting‌:
    1. The system automatically generates the I-V curve.
    2. Extract key parameters: ‌Voc‌ (open-circuit voltage), ‌Isc‌ (short-circuit current), ‌Pmax‌ (maximum power point), and ‌FF‌ (fill factor).
 

3. Result Analysis

  1. ‌Performance Evaluation‌: Compare the measured curve with the standard reference to assess efficiency compliance.
  2. ‌Anomaly Detection‌:
    1. Abnormal slope may indicate increased series resistance or shunt leakage.
    2. "Steps" or "dips" in the curve suggest partial shading, hot spots, or internal connection failures.
  3. ‌Standards Reference‌: Follow international standards such as ‌IEC 61829 ED3‌ for field measurements and uncertainty evaluation.