Multifunctional Wireless Phase Volt-Ampere Meter

The MOEORW-WNS41 is a high-precision AC parameter testing instrument developed by Wuhan Moen Intelligent Electric Co., Ltd., adopting direct AC sampling technology to measure power frequency electrical parameters and identify wiring faults of power circuits on-site. Equipped with a 7-inch TFT color touch screen, dual power supply modes, Bluetooth wireless communication and supporting PC/Android APP data management, it is specially designed for power supply and consumption enterprises to inspect energy metering systems and relay protection secondary circuits. The equipment can automatically generate vector diagrams, calculate correction coefficients and recoverable electric quantity for miswiring scenarios, with built-in storage and multi-channel data export functions to support on-site inspection, data archiving and remote analysis.

The instrument adopts true RMS (RMS) sampling architecture for three independent voltage channels and three current clamp sampling channels. Voltage signals are input via Ua/Ub/Ucn terminals with 500kΩ high input impedance; current signals are collected through split-core current transformers and converted into standard low-current signals for internal DSP processing.
1.Electrical parameter calculation: Real-time calculation of voltage, current, frequency, active/reactive/apparent power and power factor based on sampled sinusoidal waveforms.
2.Wiring identification logic: Compare measured phase angles, vector relationships and phase sequences with standard three-phase three-wire/three-phase four-wire wiring models, match 336 groups (3P3L) / 672 groups (3P4L) miswiring combinations, and output corresponding power expressions and correction coefficients.
3.Data communication & storage: Local data cached and stored in internal memory; data transmitted to PC via RS232/USB flash drive or to Android terminals via Bluetooth for real-time monitoring, trend curve drawing and unbalance analysis.
4.Dual power supply logic: Auto-switch between PT voltage side AC power supply (80V~480V) and built-in 7600mAh lithium battery; auto screen saver and auto power-off functions activate under no signal/idle conditions to extend battery life.

Main Unit Front Panel

• 7-inch 800*480 TFT touch display, combined physical key operation
• Dedicated function keys: Power On, Parameter Measurement, Wiring Check, CT Ratio Test, Range Selection, System Setting, Data Query, Data Save, Extended Function, Return, Character Switch & Input Keyboard

Rear Panel

• Factory label: Mark model, accuracy, specification, production date and service hotline
• Removable battery compartment with fixed screws, heat dissipation vents, wrist strap reserved slots
• DC12V charging port, Ua/Ub/Uc/Un voltage terminals, dual current clamp interfaces (small current Ia/Ib/Ic, large current IA/IB/IC), USB flash drive port, RS232 communication port, PT power switch

Standard Accessories
1.Main unit ×1
2.Split-core current transformers (5A standard) ×3
3.Three-phase four-wire voltage test leads (Y/G/R/B) ×1 set
4.Three-phase three-wire voltage test leads ×1 set
5.AC220V/DC12V power adapter ×1
6.Special USB data flash drive ×1
7.Carrying case with shockproof liner ×1
8.Operation manual ×1

Reference Operating Conditions

Basic Measurement Accuracy
Note: Phase error reaches ±3° when voltage 5~10V & current 1.5~10mA; rated working error ≤ 2× basic error limit.
 

Channel Characteristics
1.Voltage Channel: 3 independent channels UAN/UBN/UCN, input impedance 500kΩ, true RMS measurement
2.Current Channel: 3-channel clamp CT sampling, true RMS algorithm; dual current interfaces for small (1mA~200mA) and large (10mA~10A) current measurement

Safety & Mechanical Parameters

Power Supply Parameters

1.PT AC Power Supply: AC80V~480V, power consumption 7.5VA
2.Built-in Lithium Battery: 7600mAh 7.4V, charging time >8h, cycle life >500 times
3.External Adapter: AC220V input, DC12V output

Hardware & Display Configuration
1.7-inch 800*480 TFT color touch screen, dual touch/physical key operation, full Chinese character library supporting Chinese/English/numeric input for data labeling
2.Automatic range switching for voltage and current channels, no manual range adjustment required
3.Dual power supply architecture: self-powered via PT secondary voltage or built-in high-capacity lithium battery for outdoor field testing without external power
4.Multi-mode wiring compatibility: support single-phase, three-phase three-wire (Δ), three-phase four-wire (Y) measurement modes
5.Dual data export interfaces: USB flash drive offline export + RS232 wired PC communication; Bluetooth wireless linkage with Android mobile terminals
 

Core Measurement Performance
1.Simultaneous measurement of 3-channel voltage, current, frequency, phase angle, active/reactive/apparent power and power factor; real-time hexagonal vector diagram display
2.Automatic miswiring identification: cover 336 groups of 3P3L and 672 groups of 3P4L miswiring combinations, output secondary wiring diagram, power expression, correction coefficient and recoverable electric quantity calculation
3.CT transformation ratio & phase difference test for low-voltage current transformers; support PT/CT ratio setting to convert secondary measured data to primary high-voltage/high-current values
4.Voltage & current unbalance rate calculation, support manual switching of nominal voltage gears (57.7V/100V/220V/380V)
5.Vector calculator function: calculate vector sum of three-phase currents to derive theoretical neutral line current
 

Data Recording & Management
1.Trend recording function: arbitrarily select 4 electrical parameters for cyclic logging, interval adjustable 1~99s, store up to 500 record points per task, generate load curve graphs
2.Local storage capacity: save maximum 4000 groups of complete measurement data including vector diagrams and wiring schematics; support single record deletion or full data batch clearing
3.Offline data export: export all stored records to dedicated USB flash drive, readable by supporting PC management software for report generation and printing
4.Android APP wireless linkage: Bluetooth real-time data collection, on-site photo/video positioning for inspection evidence, cloud remote data upload and off-site query
 

Auxiliary & Software Functions
1.Wiring simulation module: manually set voltage, current amplitude and phase angle to simulate various wiring faults for training and verification
2.System parameter adjustment: editable system time, serial port baud rate, sampling frequency, screen brightness and screen saver time
3.PC upper computer management software: support real-time online data collection, U 盘 data import, historical data query, curve plotting and A4 standard test report output
4.Automatic power-saving logic: auto screen saver after 2min idle without operation; auto power-off after 2min when no voltage/current input signal

1.Power supply company metering inspection: on-site check of energy meter secondary wiring, identify reverse polarity, phase misconnection and open/short circuit faults
2.Industrial & commercial power consumption audit: calculate electricity recovery amount via correction coefficient for miswiring loss
3.Relay protection commissioning: measure three-phase vector relationship to verify protection circuit wiring correctness
4.Low-voltage distribution network quality monitoring: record long-term voltage/current fluctuation, calculate three-phase unbalance rate
5.CT on-site calibration: test transformation ratio and phase error of low-voltage current transformers
6.Power training institutions: wiring simulation function for electrician training and fault diagnosis practice

Standard Operation Sequence
1.Power on the instrument first, connect test leads to instrument terminals
2.Clamp CT sensors on measured conductors, connect voltage probes to power circuit terminals
3.Select corresponding wiring mode (single-phase/3P3L/3P4L) on interface, complete measurement and save data
4.Disconnect test probes from field equipment first, then remove leads from instrument terminals and power off

Daily Maintenance Requirements
1.Split-core CT maintenance: Clean jaw contact surfaces with silk cloth dipped in anhydrous alcohol regularly; avoid hair, metal debris or dust between jaws to prevent accuracy drift
2.Storage environment: Store in dry, dust-free warehouse; avoid long-term exposure to high temperature, humidity and strong electromagnetic field
3.Battery maintenance: Charge fully every 3 months during long-term storage; stop charging once the battery indicator stops flashing
4.Cable management: Do not pull test leads violently; store leads neatly to avoid core wire breakage
5.Prohibition: Do not disassemble the instrument shell; only use factory-provided original test accessories

Safety Operation Rules
1.Maximum test voltage shall not exceed 500V AC; do not plug/unplug test leads when the circuit is live
2.Do not touch terminal jack surfaces with bare hands during live measurement to prevent electric shock hazards
3.For three-phase three-wire testing, leave Ub terminal vacant; for single-phase testing, only use Ua and Ia channels
4.Keep CT clamps away from adjacent large-current conductors to reduce electromagnetic interference
5.Do not operate the instrument with wet hands or immerse the unit in liquid