Yokogawa WT310HC Digital Power Meter

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

• 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