Yokogawa WT310EH Digital Power Meter

The Yokogawa WT310EH is a single-phase digital power meter engineered for high-accuracy AC and DC power measurements in compact form. It delivers ±0.15% basic power accuracy at 50/60 Hz across all ranges and supports simultaneous measurement of voltage, current, power, frequency, power factor, harmonics, and THD without mode changes. The instrument handles currents from 5 mA to 40 A RMS directly, with voltage measurement capability from 15 V to 600 V, making it suitable for applications ranging from low standby power measurements to high-current device testing.

Technical Specifications

• Current input range: 5 mA to 40 A RMS


• Voltage measurement range: 15 V to 600 V


• Frequency bandwidth: DC, 0.1 Hz to 20 kHz


• Basic power accuracy (50/60 Hz): ±(0.1% of reading + 0.05% of RMS range)


• Basic DC accuracy: ±(0.1% of reading + 0.2% of RMS range)


• Data update rate: 100 ms maximum; auto-adjustable down to 0.1 Hz for fluctuating frequencies


• Crest factor: Up to 300 (or 6 A, depending on mode)


• Integration measurement: Energy (Wh) and charge (Ah) over extended periods up to approximately 10,000 hours


• Harmonics analysis: Up to 50th order (with optional -G5 configuration)

Key Features

• High-speed auto-ranging in integration mode ensures continuous accuracy when input levels exceed selected ranges, eliminating test repetitions


• Auto-ranging function across selected measurement ranges


• Simultaneous AC and DC parameter measurement including harmonic and THD analysis


• Fast display update enables quick test procedures


• Automatic data rate adjustment for tracking motor frequencies and other variable input conditions


• Standby power measurement compliance with IEC62301, Energy Star, and SPECpower standards


• High measurement resolution: 100 µW on 5 mA range

Typical Applications

• Low standby power characterization


• Induction cooker and high-current device testing


• Motor and variable-frequency equipment analysis


• Energy consumption profiling over extended durations


• Harmonic distortion assessment

Compatibility & Integration

• USB (standard)


• GP-IB (optional; standard on -C1)


• RS-232 (selectable; standard on -C2)


• Ethernet via Modbus/TCP (optional -C7)


• External sensor input support