DV Power provides high-accuracy, portable, and rack-mounted instruments for the comprehensive diagnosis of power and instrument transformers. Key applications include winding resistance, turns ratio, heat run tests, and automatic demagnetization. A standout feature is the non-intrusive condition assessment of On-Load Tap Changers (OLTC) using Dynamic Resistance Measurement (DRM). The system is supported by DV-Win software, which facilitates detailed graphical analysis and one-click customizable reporting (XLS, PDF).