Tonghui TH3422 Power Meter

The Tonghui TH3421/TH3422 is a versatile, high-precision digital power meter offering multi-channel measurement, sophisticated harmonic and waveform displays, and rich connectivity—all in a compact, user-friendly touchscreen package. Ideal for labs, R&D, manufacturing QA, and energy analysis scenarios.

Key Features

• Multi-channel measurement: Optional 3 or 4 channels (TH3421/TH3422) with single‑phase and three‑phase wiring modes .
• Wide measurement range:
  • Voltage: 5 V–600 V
  • Current: 10 μA–20 A
  • Power: 5 mW–12 kW .
• Superior accuracy: Basic measurement accuracy of 0.15% reading + 0.2% range + 1 digit .
• Harmonic analysis: Can display harmonic content via list, bar graph, waveform, and vector display .
• High-resolution touchscreen: 7″ TFT resistive touch panel (800×480 or 800×600), mouse support, screenshot capture .
• Flexible energy logging: Continuous or manual integration, USB file storage compatible with most flash drives .
• Programmable relay output: Up to 8 comparison channels, configurable output for thresholds .
• Robust connectivity: RS‑232C/RS‑485, USB host/device, LAN, handler interface, Wi-Fi with external network card .
• Embedded & synchronized control: Uses PLL for frequency‑synchronized sampling, supports both AC/DC testing .
• Broad frequency support: Handles fundamental frequencies from DC or 45 Hz up to 420 Hz (21 kHz bandwidth, 5 kHz filter) .