HIOKI PW3337 – 3-Channel High Precision AC/DC Power Meter

Overview

The HIOKI PW3337 is a state-of-the-art, three-channel AC/DC power meter designed for demanding industrial, R&D, and production environments. It allows accurate measurement over a broad range of electrical signals—from very low frequency and DC up to high frequency, over multiple wiring configurations. Whether you’re evaluating motors, inverters, power supplies, or complete power conditioning systems, the PW3337 offers the flexibility and precision needed for both development and compliance testing.

Designed to handle direct inputs of up to 1000 V AC/DC and 65 A per channel (direct input), with optional current sensor inputs for much larger currents (up to 5000 A in some configurations), the PW3337 is well suited for power systems with large dynamic swings. It supports single‐phase (2-wire, 3-wire) to three-phase (3-wire & 4-wire) wiring, with all channels independently ranged for voltage/current.

Because many real-world loads (motors, PV inverters, etc.) have non-sinusoidal waveforms and require harmonic analysis, the PW3337 includes built-in harmonic measurement compliant with IEC 61000-4-7, offering analysis up to the 50th harmonic. It also handles low power factor loads with high accuracy, making it ideal for testing no-load transformer loss, motor idle currents, etc.

Key Features

• 3 channels of input for simultaneous measurement in multi-phase or mixed AC/DC + phase systems.

• Direct input capability: up to 1000 V AC/DC and 65 A per channel (without external sensors).

• Optional external current sensors allow measurement up to 5000 A when needed.

• Wide bandwidth: DC (0 Hz) / 0.1 Hz up to 100 kHz for both voltage and current channels.

• High basic accuracy: around ±0.15% (active power, certain condition), even at low power factor. Some modes/specifications claim ±0.1% under certain inputs.

• Supports harmonic analysis per IEC 61000-4-7 up to the 50th order, with total harmonic distortion, RMS, phase angles etc.

• Multiple measurement items supported: Voltage, Current, Active/Reactive/Apparent Power, Power Factor, Frequency, Phase Angle, Efficiency, Integration (energy cumulation), waveform peaks, crest factor, ripple factor, etc.

• Synchronization: up to 8 units can be synchronized for large‐scale measurements (multi-channel up to 24 channels).

• Optional factory variants/options: GP-IB interface, D/A output, etc.

Applications

The PW3337 is suitable for many applications, including, but not limited to:

• R&D in motors, inverters, and power electronics, especially where both AC and DC components need measurement.

• Production line testing for power supplies, power conditioners, AC/DC converters.

• Efficiency testing of solar inverters / PV systems (PCS), battery inverters, etc.

• Transformer idle loss and no-load testing, especially when power factor is low.

• Compliance testing for harmonic distortion, waveform distortion under load.

• Power quality monitoring, waveform evaluation, ripple in DC supplies.

• Devices that see transient current spikes, varying loads (e.g. compressors, motors, HVAC equipment).

• Applications requiring multiple channels or large current measurement using sensors, or needing synchronized measurements across units.

Package Contents

What you typically receive in the box (depending on variant / region) includes:

• Main unit: HIOKI PW3337 power meter (with 3 input channels)

• AC power cord

• Instruction manual / User guide

• Measurement guide / setup guide

• Optional / variant accessories depending on order: GP-IB interface model / D/A output model

• (If ordered) external current sensors (clamp sensors or pass-through sensors)

• Connection cables, mounting hardware or brackets (depending on distributor)

• Software utilities / PC communicator tool (for data capture, waveform display, synchronization)