The Yokogawa WT333E is a three-element digital power meter engineered for simultaneous AC and DC power measurements across single-phase and three-phase systems. It delivers ±(0.1% of reading + 0.05% of RMS range) accuracy at 50/60 Hz and samples at 100 kS/s with 16-bit resolution. The instrument measures RMS, MEAN, and DC voltage concurrently, performs harmonic analysis up to the 50th order with optional -G5 module, and executes integration measurements for up to 10,000 hours without mode switching. Real-time filtering removes noise and harmonic components. Four 7-segment LED displays present simultaneous readings. Auto-zero adjustment compensates for zero-level drift in under 100 ms. The WT333E accommodates 1P3W, 3P3W, 3P4W, and 3V3A wiring configurations.
Technical Specifications
• Measurement Channels: 3 elements (3-phase capable)
• Frequency Bandwidth: DC, 0.1 Hz to 100 kHz
• Voltage Ranges: 15 V to 600 V RMS (direct input; Crest Factor 3)
• Current Ranges: 0.5 A to 20 A RMS (direct input; Crest Factor 3)
• Sampling Rate: 100 kS/s, 16-bit
• Data Update Rate: 100 ms, 250 ms, 500 ms, 1 s, 2 s, 5 s, 10 s, 20 s, or Auto (100 ms)
• Accuracy (Basic Power): ±(0.1% of reading + 0.05% of RMS range) at 50/60 Hz
• Harmonics: Up to 50th order with THD calculation (requires -G5 option); PLL synchronization included
• Integration: Up to 10,000 hours with automatic range switching
• External Sensor Input: EX1 accepts 2.5 V, 5 V, 10 V
– Key Features
• Simultaneous RMS, MEAN, and DC measurements without mode reconfiguration
• MAX Hold function captures peak voltage, current, active power, reactive power, and apparent power
• Comparator function for threshold detection
• Line and frequency filters isolate fundamental waveforms
• Auto-zero adjustment (<100 ms) on range changes
– Typical Applications
• Industrial motor testing and efficiency validation
• Power quality analysis and compliance verification
• Home appliance development and characterization
• Energy efficiency measurements
– Compatibility & Integration
Supports single-phase, three-wire; three-phase, three-wire; three-phase, four-wire; and three-voltage, three-current wiring systems. External sensor inputs (EX1) accommodate 2.5 V, 5 V, and 10 V signals.
