Yokogawa WT1803E Precision Power Analyzer

The Yokogawa WT1803E is a precision power analyzer engineered for high-accuracy measurement of electrical power parameters across R&D, manufacturing, and energy efficiency applications. It simultaneously acquires up to 6 voltage and 6 current inputs at 2 MS/s with 16-bit resolution, displayed on an 8.4-inch XGA touch-screen interface. The instrument delivers 0.05% basic power accuracy and supports harmonic analysis to the 500th order, making it ideal for characterizing power supplies, inverters, motors, and frequency conversion equipment.

Technical Specifications

• Simultaneous measurements: 6 voltage + 6 current inputs


• Sampling rate: 2 MS/s, 16-bit resolution


• Voltage range: 1.5 V to 1000 V direct input


• Frequency bandwidth: 2 MHz (voltage and current at 5 MHz, −3 dB typical)


• Power accuracy: 0.05% of reading ± 0.05% of range (1% to 110% of selected range)


• Low power factor error: 0.1% of apparent power


• Harmonic analysis: Up to 500th order at 50/60 Hz fundamentals - includes THD, HDF, THF, and impedance measurements


• Dual Harmonic option: Simultaneous analysis of two independent sources


• Data capture rate: 5 ms (external sync OFF) or 1–100 ms (external sync ON)


• Frequency measurement: Down to 0.1 Hz for low-speed motor evaluation


• Input elements: Configurable 5 A and 50 A ranges; single unit supports mixed element installation

Key Features

• High-resolution 8.4-inch XGA color display with touch-screen control


• Split-screen waveform viewing: up to 6 simultaneous traces


• Parameter display: up to 12 diverse pages


• Motor evaluation functions (optional): rotational speed, torque, slip, electrical angle, mechanical power, motor efficiency


• Auxiliary input measurement (optional): 2 additional channels


• Reduced power factor error ensures accuracy even at low displacement factors

Typical Applications

• Power supply and inverter characterization


• Motor efficiency and performance evaluation


• Harmonic distortion analysis in frequency conversion equipment


• High-frequency electronic product testing

Compatibility & Integration Flexible input element architecture accommodates 5 A and 50 A current ranges in a single chassis, scaling from single to triple input element configurations.