Yokogawa WT332E Digital Power Meter

The Yokogawa WT332E is a 2-element digital power meter engineered for precise AC and DC power analysis across wide frequency and dynamic range. It simultaneously measures voltage, current, active/reactive/apparent power, frequency, power factor, harmonics up to the 50th order, THD, and energy/current integration over extended periods - making it ideal for characterizing power supplies, consumer electronics, and standby power consumption per IEC62301, EN50564, Energy Star, and SPECpower standards.

Technical Specifications

Measurement Range & Accuracy

• Voltage: 6 direct-input ranges, 15 V to 600 V RMS (option to 1200 V RMS max input)


• Current: 6 direct-input ranges, 0.5 A to 20 A RMS; 50 µA sensitivity available; options down to 25 mARMS


• External sensor inputs: EX1 (2.5 V, 5 V, 10 V); EX2 (50 mV to 2 V)


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


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


• Crest factor: Up to 300 measurable across all ranges Frequency & Sampling


• Frequency bandwidth: DC to 100 kHz


• Sampling rate: 100 kS/s, 16-bit resolution


• Data update: 100 ms, 250 ms, 500 ms, 1 s, 2 s, 5 s, 10 s, 20 s, or Auto (100 ms default) Harmonic & Integration Capabilities


• Simultaneous harmonic analysis up to 50th order (with -G5 option)


• THD calculation included


• Energy (Wh) and current (Ah) integration: up to ~10,000 hours with automatic range adjustment

Key Features

• Simultaneous RMS, MEAN, and DC measurements on all parameters


• Automatic range switching for integration measurements


• Comparator function available


• MAX HOLD function for RMS/PEAK voltage, current, and active power


• High crest factor tolerance (300:1) for distorted waveforms

Typical Applications Power supply efficiency testing, standby/idle power measurement, device energy profiling, harmonics compliance verification, and extended-duration energy consumption auditing.

Compatibility & Integration 2-element configuration supports dual-channel simultaneous measurement. External sensor inputs permit current transformation and extended measurement range via analog transducers.