Abstract: This study aims to ensure the accuracy and reliability of voltage and current measurement systems used in impulse testing by examining and quantifying the impact of digital recorders on impulse measurement outcomes. It focuses on the influence of range selection in digital recorders and evaluates their performance within these systems. The paper outlines calibration methods, procedures, and principles for impulse-specific digital recorders, discussing the technical specifications and calibration device feasibility. The study also proposes an experimental approach to evaluate the effect of range selection on digital recorders, using high-precision models PXI-5124, PXIe-5164, and PXIe-5172. Results reveal a consistent relationship between measurement range and error: larger ranges result in greater peak errors but reduced time parameter errors. Optimal measurement ranges for peak and time parameter accuracy are identified for each recorder. Furthermore, a methodology to calculate recorder uncertainty is presented. For the PXIe-5164 at a 10V range, under a 0.84/60 waveform, the expanded uncertainty (k=2) was determined: U_t at 0.15%, T₁ at 2.1%, and T₂ at 0.51%. This research thoroughly assesses digital recorder performance, their role in the uncertainty of impulse measurement systems, and contributes to enhancing both the theoretical and practical aspects of these systems.