Yokogawa WT310 Digital Power Meter

The Yokogawa WT310 Digital Power Meter is a half-rack instrument engineered for precise measurement of electrical power across AC and DC systems in industrial and research environments. It delivers 0.1% basic accuracy and simultaneous measurement of voltage, current, active power, reactive power, apparent power, power factor, frequency, and harmonics without mode switching. The WT310 operates from 100–240 VAC supply (90–264 VAC permitted range) at 50/60 Hz and consumes maximum 50 VA, with lithium battery backup for setup parameters.

Technical Specifications

• Measurement Bandwidth: DC, 0.5 Hz to 100 kHz (0.1 Hz to 100 kHz for WT310E/EH variants)


• Basic Accuracy: 0.1% of reading (0.1% of reading + 0.05% of range for WT310E/EH)


• Voltage Input Ranges: 7.5 V to 600 V direct input (crest factor dependent); maximum 1000 VRMS or 1.5 kV peak


• Voltage Input Impedance: Approximately 2 MΩ


• Current Input Ranges: 2.5 mA to 20 A direct input (standard); 1 A to 40 A for WT310EH; down to 50 µA for WT310 base model


• Current Input Resistance: 6 mΩ + 10 mΩ (max) for 0.5–20 A ranges; approximately 500 mΩ for 5–200 mA ranges


• Warm-up Time: Approximately 30 minutes


• Operating Environment: 5–40°C, 20–80% RH (non-condensing), elevation ≤2000 m


• Storage Environment: −25–60°C


• Weight: Approximately 3 kg


• Dimensions: Half-rack size

Key Features

• Simultaneous AC and DC parameter measurement across multiple channels


• Harmonic analysis and integration performed concurrently with primary measurements


• External current sensor input options (EX1, EX2) for extended range capability


• Lithium battery-backed parameter retention


• Direct voltage input to 600 V; direct current input to 40 A (WT310EH)


• Low input capacitance (13 pF) and inductance specifications minimize circuit loading

Typical Applications Product development, quality assurance, energy efficiency analysis, production line testing, and R&D power characterization where simultaneous multi-parameter AC/DC measurement and harmonic content analysis are required.