SDL V401 Sentinel® Voltage Loggers The Sentinel® Voltage Logger Model SDL V401 is a rechargeable battery powered four-channel voltage recording device designed to record voltages up to 600VAC or 850VDC. Real-time display of waveforms and harmonics is available with the DataView® software, which is included. Programmable storage rate and storage modes, combined with simple one button operation, make this a versatile and easy-to-use data logger, perfect for a variety of applications. # Features True RMS measurements # Low-cost, self-contained, portable # Measures up to 600VAC Trms # Measures up to 850VDC # Programmable storage mode # Programmable data storage rate # Stores up to 480,000 points (1MB) # 64 samples per cycle # Includes DataView software for data storage, real-time display, analysis and report generation # Optically isolated USB # 2.0 communication600V Cat. III, 300V Cat. IV # Applications Phase unbalance monitoring # Surge and Sag recording # Line surveys