The Amprobe DM-II is a power quality recorder and data logger engineered for electrical system analysis, maintenance, and troubleshooting across single and three-phase installations. It captures simultaneous measurements of voltage, current, power, energy, and power quality parameters with True RMS accuracy, then stores data at user-selectable intervals spanning one hour to several months. Engineers deploy the DM-II to monitor voltage anomalies, harmonics, frequency deviation, and demand profiles in Y and Delta configurations without interrupting system operation.
Technical Specifications
Measurement Range
• AC Voltage: 0–600 V
• AC Current: 1–1000 A (expandable to 3000 A with optional current transducers)
• Active Power (W), Reactive Power (VAR), Apparent Power (VA)
• Energy (kWh), Peak Demand (kW), Power Factor (0–1)
• Voltage Anomalies (sags and surges), Harmonics, Frequency (50/60 Hz)
Accuracy
• AC Voltage: ±(1.0% Rdg + 3 LSD)
• AC Current: ±(1.0% Rdg + 3 LSD)
– Key Features
• Simultaneous recording of all parameters across all phases
• User-selectable recording rates: 1 hour to several months
• Threshold-based recording for RMS voltage or current within specified bounds
• Unlimited recording duration for event data (max, min, average, peak, energy)
• True RMS readings for non-linear loads
• Adjustable LCD brightness for temperature compensation
• Line and battery power with visual status indicators (green for 110 V line, red for battery)
• Real-time data download via RS-232 serial interface
• Data analysis using DM-II View or DMII™ PRO software
• Direct on-screen data review without PC transfer
– Typical Applications
Power quality audits, demand profiling, harmonic analysis, transient event capture, and long-term energy monitoring in commercial and industrial three-phase systems.
– Compatibility & Integration
RS-232 serial connectivity supports Windows PC software for data export and analysis. Compatible with single-phase and three-phase systems in Y and Delta configurations. Optional current transducers (3000 A flexible and 100 A fixed) extend measurement capability beyond standard 1000 A range.
