Yokogawa WT500 Power Analyzer

The Yokogawa WT500 is a mid-range power analyzer for simultaneous single-phase and three-phase measurements of voltage, current, power, and harmonic components. It measures AC and DC signals concurrently, making it essential for evaluating DC/AC conversion in renewable energy applications. The instrument performs efficiency calculations, transient analysis, and power quality assessment with harmonic measurements to the 50th order.

A 5.7-inch color TFT LCD displays numerical values, waveforms, trends, and optional vector/bar graph formats. Data exports directly to USB memory in CSV format.

Technical Specifications

• Voltage Measurement: 0.1 V to 1000 V; 1.5 V to 1000 V; 15 V to 1000 V; selectable 15/30/60/100/150/300/600/1000 V ranges; up to 1000 Vrms


• Current Measurement (Direct): 0.5 A to 40 A; 5 mA to 30 A; up to 40 Arms


• Current Measurement (External Sensor): 50 mV to 10 V selectable input ranges


• Basic Power Accuracy: ±0.1% of reading ±0.1% of range; ±0.2% alternate specification


• Measurement Bandwidth: DC to 100 kHz; 0.1 Hz to 1 MHz


• Sampling Frequency: Approximately 100 kS/s


• Crest Factor: 3 or greater


• Internal Memory: 20 MB or 2 GB options


• Power Supply: 100–240 VAC (auto-switching), 50/60 Hz


• Power Consumption: Max 80 VA

Key Features

• Simultaneous AC/DC signal measurement for renewable energy and power conversion analysis


• Harmonic analysis up to 50th order with optional /G5 power quality module


• Total harmonic distortion (THD) measurement without mode switching


• Dual efficiency calculations via input/output element selection


• Integration functions for charge/discharge current and bought/sold power evaluation


• Average active power over user-defined integration intervals


• Transient analysis capability

Typical Applications

• Power supply and inverter testing


• Motor efficiency characterization


• Energy-saving equipment evaluation


• Photovoltaic power generation system analysis


• Secondary cell charge/discharge profiling

Compatibility & Integration

• USB data export (CSV format)


• USB, GP-IB, Ethernet, and RS-232C communication interfaces (optional)


• External USB memory storage up to 1 GB