New generation of precision digital power meter – the GPM-8340.

Designed specifically for multiphase AC power measurements with high accuracy.

The GW Instek GPM-8340 is a digital power meter designed specifically for multiphase AC power measurements, making it suitable for a wide range of electrical and electronic product testing applications.

Featuring a test bandwidth of DC, 0.1 Hz to 10 kHz, a 16-bit A/D converter, and a 300 kHz sampling rate, the GPM-8340 utilizes a 5” TFT LCD display, 5-digit measurement display, provides 28 relevant power measurement parameters, and offers high-precision measurement capabilities.

It also features waveform display (voltage/current/power), integration measurement function, harmonic measurement and analysis (50 Hz / 60Hz measurement compliant with IEC61000-4-7 requirements), external sensor input terminals, and various communication interfaces, helping users achieve clear, convenient, and accurate power measurements.

It is considered one of the most feature-rich and cost-effective power meters in its class.

Wiring Modes & Measurement Capabilities

Flexible input voltage configuration modes for comprehensive power & efficiency evaluation.

The GPM-8340 offers multiple input voltage configuration wiring modes (1P2W/1P3W/3P3W/3P4W/3V3A), allowing users to select the wiring mode to meet specific parameter measurements or even efficiency calculations.

Furthermore, it has a rated direct input voltage of 1000V and an input current of 20A, supports a minimum current range down to 5 mA (resolution 0.1 µA), a power measurement resolution of 0.1 µW, and fixed crest factors (voltage: 3, current: 4). Its voltage/current/power measurement capabilities reach (±0.1% of reading ±0.05%).

The GPM-8340 supports multiple measurement modes—AC+DC, AC, DC, and V-MEAN—to accommodate a wide range of testing requirements.

It provides up to 28 power-related measurement parameters, including voltage (Vrms, Vac, Vdc, Vmn, V+pk, V-pk), current (Irms, Iac, Idc, I+pk, I-pk), frequency (VHz, IHz), power (P, P+pk, P-pk), crest factors (CFV, CFI), apparent power (VA), reactive power (VAR), power factor (PF), phase angle (DEG), total harmonic distortion (THDV, THDI), maximum current ratio (MCR), and inrush current.

It also features MATH and EFFi calculation functions. With its comprehensive measurement capabilities, the GPM-8340 provides the measurement ranges and accuracy needed for reliable power consumption testing of electrical and electronic products.

Display & Graphical Analysis

Intuitive numerical displays and waveform visualization on a 5” TFT LCD.

1. 5' LCD
2. Function Keys (F1 ~ F5)
3. Soft Keys
4. Function Key
5. Hardcopy Key
6. Waveform & Harmonic Key
7. Arrow Key
8. USB Host Port
9. Wiring Ke

The GPM-8340 makes effective use of its TFT LCD to present measurement results in both numerical and graphical formats. For numerical displays, the instrument offers two modes: Normal Mode and Multi-Element Mode.

• Normal Mode
  Normal Mode provides five pages (Page 1 to Page 5), each displaying up to 10 measurement parameters (including two primary measurements and eight monitoring measurements). Users can freely configure the displayed parameters to suit their specific measurement requirements across different modules.

• Multi-Element Mode
  Multi-Element Mode simultaneously displays measurement results from four modules, making it particularly useful for comparing measurement differences between modules, such as in three-phase unbalanced power systems. This mode also provides four pages, each displaying up to eight measurement parameters.

For graphical analysis, the GPM-8340 features a simplified oscilloscope mode that displays voltage, current, and power waveforms. In addition, the measurement and analysis of each harmonic of the measurement signal can be fully presented in numerical or bar graph format, which not only meets the requirements of accuracy and readability in process testing, but also meets the diverse measurement application needs in R&D design and quality verification.

Auxiliary Measurement & Range Control

Built-in mechanisms to extend voltage/current range and optimize workflow efficiency.

Furthermore, the GPM-8340 excels in its auxiliary measurement mechanisms and functions. For high-voltage applications, it offers a VT rate setting for use with an external potential transformer.

For high-current measurements, depending on the type of current transformer (voltage output or current output), the current output type can be directly mounted to the rear panel and used with the CT rate setting; the voltage output type can be measured via the external current sensor input terminal (EXT) provided by the GPM-8340.

Automatic range switching allows for customization of desired range levels, saving unnecessary switching time. The 10,000-entry internal memory can store measurement data according to the update rate set by the GPM-8340 or a user-defined time interval for subsequent analysis.

Data Storage & System Integration

Comprehensive connectivity and automated test interface for system integration.

1. Voltage Input Terminal
2. External Sensor Input
3. Current Input Terminal
4. LAN Port
5. Digital I/O
6. USB Device Port
7. RS-232 Connector
8. CAN Port or mini GPIB

For data acquisition and storage, the GPM-8340 offers a variety of communication interfaces: RS-232C, USB device (virtual COM), LAN and mini GPIB or CAN (select one). Users can write programs to read measurement results according to their usage habits or existing system interfaces.

The USB host supports screen capture, access to internally recorded data, and firmware updates. For applications requiring external signal control, the GPM-8340 also provides a Digital I/O interface for connecting external controllers such as PLCs to meet the needs of automated measurement applications.

The GPM-8340 is 3U in height and half the width of a standard rack, making it ideal for system integration.