Amprobe DM-III

The Amprobe DM-III is a digital multimeter and power quality analyzer engineered for electrical troubleshooting and data logging in industrial and commercial environments. It delivers True RMS measurements across single-phase and three-phase systems (Y and Delta configurations), simultaneously recording up to 64 parameters. The instrument measures AC current from 5A to 1000A (expandable to 3000A with optional flexible current transducers), AC voltage to 600V, and detects voltage sags and surges across the 0–600V range.

– Technical Specifications

• AC Current: 5A to 1000A (expandable to 3000A with optional flexible CTs)
• AC Voltage: 0V to 600V
• Harmonics: Total Harmonic Distortion (THD), DC, and individual harmonics up to the 49th order
• Power: Active (W), Reactive (VAR), and Apparent (VA)
• Energy: Working (kWh), Reactive (VARh), and Apparent (VAh)
• Peak Demand: kW measurement
• Power Factor: 0.00 to 1.00
• Frequency: Selectable 50 Hz or 60 Hz fundamental
• Insulation Testing (Megohmmeter): Test voltages up to 1000V with programmable timer for Dielectric Absorption Ratio Tests
• Ground Resistance: Three measurement modes—2-point continuity/resistance, 3-point Fall of Potential, and 4-point Earth Resistivity
• Safety Rating: CAT III 600V phase-to-phase, 300V phase-to-ground

– Key Features

• Built-in oscilloscope function for waveform display
• Data logger with compression and user-selectable recording rates (hours to years)
• Phase sequence indication
• Sensitive ohmmeter for motor winding and grounding continuity assessment
• Dual power: line or battery operation
• USB download to Windows PC via included software and cable

– Typical Applications

• Power quality analysis in three-phase industrial systems
• Insulation integrity verification for cables, transformers, and motors
• Harmonic content assessment in facilities with nonlinear loads
• Ground resistance and resistivity surveys
• Long-term energy consumption and demand logging

– Compatibility & Integration

Supplied as a complete kit with standard 1000A current transformer, flexible CT options, voltage leads, ground probes and leads, external power supply, carrying case, and PC software with USB download cable.