Three Phase Digital Combined Meter

Product Overview

Its core application focuses on the accurate measurement and visualization of three-phase current, three-phase voltage, and grid frequency, with scalable parameter options to meet diverse user requirements for power system diagnostics and efficiency analysis.

Core Measurement Capabilities
The Instrument offers flexible, configurable measurement ranges to accommodate both three-phase three-wire (3P3W) and three-phase four-wire (3P4W) system topologies, with the following parameter coverage:
1. Current Measurement: Accurate RMS current detection for all three phases, denoted as IA (Phase 1 Current), IB (Phase 2 Current), and IC (Phase 3 Current).
2. Voltage Measurement: Comprehensive RMS voltage monitoring including both phase voltages (UA = L1-N, UB = L2-N, UC = L3-N) and line-to-line voltages (UAB = L1-L2, UBC = L2-L3, UCA = L3-L1), totaling six independent voltage channels.
3. Extended Parameter Options: The Instrument is available in multiple variants with additional measurement functions to suit specific application needs:
Basic Variant: Grid frequency measurement (typically 45–65 Hz)
Mid-Range Variant: Frequency + power factor (capacitive/inductive range) measurement
Advanced Variant: Frequency + active power (W/kW/MW) measurement
This multi-parameter design enables the Instrument to replace a suite of standalone devices, including three-phase ammeters, three-phase voltmeters, frequency meters, power factor meters, and active power meters, streamlining system architecture and improving monitoring efficiency.

Key Technical Features & Advantages
1. Advanced Surface Mount Technology (SMT) Construction
The Instrument utilizes state-of-the-art SMT for component assembly, resulting in a highly compact, dense circuit layout. This design minimizes internal signal interference, enhances structural stability, and delivers superior operational reliability—even in harsh industrial environments characterized by high vibration, temperature fluctuations, or electromagnetic interference (EMI). The compact form factor also supports flexible DIN-rail or panel-mount installation, saving valuable space in control cabinets.

2. True RMS Measurement with AC Sampling
Equipped with a high-precision AC sampling module and true RMS measurement algorithm, the Instrument ensures accurate parameter readings regardless of waveform distortion caused by non-linear loads (e.g., variable frequency drives, rectifiers, switching power supplies, or arc furnaces). Unlike average-value sensing meters, this technology eliminates measurement errors induced by distorted waveforms, making the Instrument ideal for modern power systems with complex load profiles.

3. Programmable Display Scaling & Wide CT Compatibility
The Instrument features a user-programmable display multiplier function, enabling seamless calibration to match the ratio of external current transformers (CTs) with primary current ratings ranging from 5 A to 10,000 A. This flexibility allows the local digital display to directly show the primary system current values, eliminating the need for manual ratio calculations and simplifying on-site data interpretation for field technicians. The Instrument is compatible with standard CT models rated for 1 A or 5 A secondary output, ensuring easy integration with existing power monitoring infrastructure

Technical Parameters