GPM-8340 Digital Power Meter

The GW Instek GPM-8340 is a four-element digital power meter for single-phase and three-phase AC power measurement. It measures from DC and 0.1 Hz to 10 kHz, accepts 15 V to 1000 V and 5 mA to 20 A directly, and reports up to 28 power-related parameters, with harmonic analysis to the 50th order, waveform display, integration (energy) measurement and inrush current capture on a 5-inch TFT LCD.

Key specifications

Accuracy applies with a sine-wave input from 1% to 105% of range (1% to 110% for active power) at 23 °C ±5 °C after a 30-minute warm-up; GW Instek’s specification sheet lists the full accuracy table for the other frequency bands.

Four elements for three-phase and efficiency work

The four input elements and selectable wiring modes let you set up the GPM-8340 for specific parameter measurements or efficiency calculations, using its MATH and EFFi calculation functions. Normal Mode shows up to 10 parameters per page across five pages; Multi-Element Mode shows the four elements side by side, which is useful when comparing phases in an unbalanced three-phase system. The display also shows voltage, current and power waveforms and presents harmonics as numbers or bar graphs.

Extending range with external transformers and sensors

For high-voltage applications, a VT ratio setting scales readings from an external potential transformer. For high currents, a current-output CT connects to the current inputs with a CT ratio setting, and a voltage-output sensor such as the GW Instek GCP-300 current probe connects to the external sensor input (EXT). Auto-ranging, a configurable integration timer and remote start/stop of integration support long energy tests.

Interfaces and the CAN or GPIB choice

RS-232C, USB device (virtual COM), USB host and LAN are standard. The fourth interface is a factory-installed choice: order the GPM-8340 with CAN (CAN + Digital I/O) or with GPIB (mini GPIB + Digital I/O). The Digital I/O port connects to a PLC for automated pass/fail. The meter is 3U high and half a standard rack wide, and the GRA-452 kit mounts it in a 19-inch rack.

Applications

• Power consumption testing of electrical and electronic products.
• Three-phase measurement, including comparison of elements in unbalanced systems.
• Efficiency calculation with the MATH and EFFi functions.
• Harmonic, inrush current and energy measurement at 50/60 Hz.
• Automated test through LAN, RS-232C, USB and the PLC-ready Digital I/O.

Buy the GPM-8340 in India from GSAS Micro Systems

GSAS Micro Systems is an authorized GW Instek engineering partner for Karnataka, Andhra Pradesh and Telangana, supporting customers across India. We help you select the CAN or GPIB variant, current sensors and leads, and provide GST-compliant quotations and application support for teams in Bengaluru, Hyderabad, Chennai, Pune, Mumbai and Delhi NCR. Request a quote or read our LCR-7000 and GPM-8340 launch post.