The Yokogawa WT310HC is a single-phase digital power meter engineered for high-accuracy AC and DC power measurements across distorted waveforms and high harmonic content. Built for modern switching power supplies and energy-efficient devices, it simultaneously measures voltage, current, active power, reactive power, apparent power, power factor, frequency, harmonics, and energy integration without mode switching. Direct current input capability reaches 40 A RMS, making it suitable for both precision laboratory work and production-line validation.
Technical Specifications
Measurement Parameters
• Voltage, Current, Active Power, Reactive Power, Apparent Power, Power Factor, Frequency, Harmonics, and Integration (Ah, Wh)
• Integration function supports up to 10,000 hours with auto-ranging for fluctuating power devices
• Average Active Power measurement for burst-waveform and variable-load applications
Voltage Measurement
• Ranges: 15 V, 30 V, 60 V, 150 V, 300 V, 600 V RMS
• Crest Factor: Up to 3 or 6 (range-dependent)
• Input Impedance: Approximately 2 MΩ with ~13 pF parallel capacitance
Current Measurement — Direct Input
• Crest Factor 3: 5 mA to 20 A RMS (twelve ranges)
• Crest Factor 6: 2.5 mA to 10 A RMS (twelve ranges)
• High Current: Direct input up to 40 A RMS (WT310HC)
• Input Impedance (≤200 mA): ~500 mΩ + ~1 μH series inductance
• Input Impedance (0.5 A–20 A): ~6 mΩ + 10 mΩ max, ~0.1 μH series inductance
Current Measurement — External Sensor Input
• EX1 (Crest Factor 3): 2.5 V, 5 V, 10 V
• EX1 (Crest Factor 6): 1.25 V, 2.5 V, 5 V
• EX2 (Crest Factor 3): 50 mV to 2 V (six ranges)
• EX2 (Crest Factor 6): 25 mV to 1 V (six ranges)
Bandwidth
• DC and 0.5 Hz to 100 kHz
– Key Features
• Single measurement mode captures all AC and DC parameters, harmonics, and integration simultaneously
• High-resolution analog-to-digital converter for precise waveform capture
• Auto-ranging integration function for standby and variable-load power analysis
• Handles waveforms with DC components and severe harmonic distortion
– Typical Applications
• R&D characterization of switching power supplies and renewable energy converters
• Production-line efficiency validation for consumer electronics
• Standby power and energy consumption testing
• Harmonic and power quality assessment in non-linear loads
