Integrating precision power measurement, waveform visualization, energy integration and harmonic analysis for R&D, manufacturing and quality assurance

【TAIPEI, Taiwan, November 13, 2026】 GW Instek introduces the GPM-8340 Four-Element Digital Power Meter, designed to bring multiphase AC power measurement, graphical analysis and measurement-data management into one instrument. Intended for research and development, manufacturing engineering and quality assurance, the GPM-8340 combines four input elements with a five-inch color TFT LCD, waveform display, energy integration and harmonic analysis. The result is a practical measurement platform for engineers who need to evaluate electrical and electronic products under different wiring configurations and operating conditions.

The GPM-8340 offers a voltage and current measurement bandwidth covering DC and 0.1 Hz to 10 kHz, with a 16-bit analog-to-digital converter and a maximum sampling rate of approximately 300 kHz. Its five-digit display supports a selection of 28 power-related measurement parameters. Users can examine RMS and peak voltage and current, active, apparent and reactive power, power factor, phase angle, crest factor, frequency and total harmonic distortion. Mathematical calculation and efficiency functions, together with inrush-current measurement, broaden the information available during product characterization.

GPM-8340 Four-Element Digital Power Meter
*Note: Image is for illustration purposes only; actual product appearance may vary.

Technical Advantages | Flexible Wiring Configurations and High-Precision Measurement Engine

Flexible wiring configuration is central to the product's design. The instrument supports single-phase two-wire (1P2W), single-phase three-wire (1P3W), three-phase three-wire (3P3W), three-phase four-wire (3P4W) and three-voltage/three-current (3V3A) connections. These choices enable engineers to match the measurement arrangement to the system under test and to assess differences between electrical phases or input elements. The direct voltage measurement ranges extend to 1000 V, while current measurement ranges extend from 5 mA to 20 A. The lowest current range provides a resolution of 0.1 µA, while power measurement resolution reaches 0.1 µW.

For voltage, current and active-power measurements from 45 Hz to 66 Hz, the specified accuracy reaches ±(0.1% of reading + 0.05% of range) under the conditions defined in the detailed specifications. Those conditions include appropriate input waveforms and power factor, environmental limits, instrument warm-up and measurement settings. Accuracy requirements vary outside this frequency band, so the relevant specifications should be consulted when establishing a test procedure. This distinction enables users to apply the instrument's performance figures with the precision required in engineering verification.

Application Functions | Intuitive Graphical Display, IEC 61000-4-7 Harmonics and Energy Integration

The five-inch display allows measurement results to be viewed in numerical and graphical formats. Normal Mode offers five pages, each capable of showing up to ten selected parameters, including two primary readings and eight monitoring values. Multi-Element Mode helps users review results from the instrument's input elements and compare conditions such as three-phase imbalance. A simplified waveform view presents voltage, current and instantaneous power waveforms, giving engineers a visual reference when examining changes that may not be obvious from numeric readings alone.

Harmonic analysis further extends the evaluation workflow. The GPM-8340 presents harmonic results in numerical lists or bar graphs, supporting the inspection of voltage, current and power components. Under the applicable frequency and update-rate conditions, it supports analysis up to the 50th harmonic. The instrument's 50 Hz and 60 Hz harmonic measurement functions meet the relevant IEC 61000-4-7 requirements under their specified operating conditions. This capability supports design verification and quality investigations where understanding harmonic content is important alongside conventional power and efficiency measurements.

For applications in which consumption changes over time, the integration function measures energy and current accumulation, including watt-hours and ampere-hours, and supports average-power evaluation over a defined interval. Automatic ranging can remain active during integration to accommodate changes in the device under test. Users can also customize automatic range-switching behavior to reduce unnecessary changes during repetitive procedures. These functions help engineering teams monitor power use throughout a test cycle rather than relying only on isolated instantaneous readings.

System Expansion and Integration | Flexible Interfaces, Memory Logging and External Sensor Support

The instrument also supports external measurement arrangements. Voltage-transformer ratio settings enable the use of an appropriate external potential transformer, while current-transformer ratio settings and an EXT input facilitate current measurements with suitable external sensors. Four front-panel setups can be stored and recalled, and internal memory accommodates up to 10,000 measurement records. Logging can follow the instrument's update rate or a user-defined interval. Through the front-panel USB host, users can access recorded data, capture screen images and perform firmware updates, simplifying documentation and subsequent analysis.

For automated test systems, the GPM-8340 includes RS-232C, USB device and host connections, LAN and Digital I/O. Buyers select a factory-installed version equipped with either CAN or mini GPIB; these are alternative interface configurations rather than two interfaces included together. Digital I/O enables connection to external controllers, including PLCs, and allows integration operations to be started, stopped or reset by external signals. Its 3U-height, half-rack-width enclosure supports benchtop installation and system integration, with a rack-mount kit available as an optional accessory.

Comprehensive Application | Delivering Reliable Power Measurement from R&D to Production

In manufacturing engineering, the instrument's configurable display and automatic ranging help technicians focus on the measurements relevant to a production step. Quality-assurance teams can combine wiring selections, harmonic analysis and recorded values when documenting test outcomes. Development engineers can use integration, waveform observation and comparative element readings to investigate how a design behaves under changing conditions. In each case, the same instrument supports both direct observation at the bench and structured collection of measurement results through its communication interfaces.

With its combination of multiphase connection options, graphical analysis, integration and flexible communications, the GPM-8340 supports power testing across product development, production inspection and quality verification. GW Instek offers two factory-configured interface versions with a one-year warranty. Detailed performance conditions, regional ordering availability and accessory information can be obtained from GW Instek's official product documentation and local sales representatives.

GPM-8340 Digital Power Meter | Key Specifications Overview

View GPM-8340 Product Details

Wiring Configurations	4 Elements (1P2W, 1P3W, 3P3W, 3P4W, 3V3A)
Basic Accuracy	±(0.1% of reading + 0.05% of range) [45 Hz ~ 66 Hz]
Display & Parameters	5" TFT LCD; 28 measurement parameters; supports Waveform display & Multi-Element mode
Measurement Bandwidth	DC, 0.1 Hz to 10 kHz (16-bit ADC, approx. 300 kHz sampling rate)
Key Features	Up to 50th harmonic analysis (IEC 61000-4-7), energy integration (Wh/Ah), inrush current measurement
Data & Control Interfaces	Stores 4 panel setups & 10,000 data records; RS-232C, USB, LAN, Digital I/O, plus factory-installed CAN or mini GPIB