Portable Multifunctional Electricity Meter Field Calibrator

The MOEORW-WNX60 is a high-precision integrated testing instrument independently developed for on-site power metering inspection. It integrates electrical parameter measurement, energy meter error calibration, and wiring fault diagnosis, equipped with high-linearity built-in voltage/current transformers and detachable clamp-on current transformers.

The device adopts a full-color large LCD touch silicone keyboard with full Chinese graphical operation interface and vector diagram display, enabling non-power-off live load testing without disconnecting current loops. The built-in mass storage supports saving up to 1,000 groups of test records, with optional RS232, USB, WIFI/Bluetooth communication modules for data uploading to PC management software. The lightweight engineering plastic housing with rear support bracket supports handheld and desktop dual working modes, applicable for field inspection and laboratory standard calibration.

External Dimension & Panel Layout

• Overall dimension: 25cm × 16cm × 6cm; Net weight: 2kg
• Top terminal area: Voltage terminals UA, UB, UC, UN; Current terminals Ia+/Ia-, Ib+/Ib-, Ic+/Ic-; Clamp CT interfaces for A/B/C phase; Optic pulse signal port
• Right side interfaces: RS232 serial port, DC charging port, USB data port
• Front panel: Color LCD display + 30-key silicone touch keyboard (direction keys, confirm, storage, query, function shortcut F1-F5, numeric input keys)
• Packaging box size: 45cm × 29.5cm (L×W)
   

Standard & Optional Accessories
Standard Accessories
1.Voltage test crocodile clip wires (4 groups for three-phase four-wire)
2.5A/25A small-diameter clamp-on current transformer
3.Optic pulse sampling sensor for energy meter pulse acquisition
4.Manual pulse trigger switch
5.Standard pulse test cable (4-channel crocodile clip)
6.DC power charger
7.USB data transmission cable
8.Handheld fixing strap
9.Product operation manual

1.Medium clamp CT (100A / 500A range)
2.Large clamp CT (400A / 2000A range)
3.High-voltage clamp CT (max 500A)
4.Barcode scanner for automatic meter number entry
5.WIFI/Bluetooth remote control module
6.PC background data management software
7.Data storage U disk

1.Input Measurement Characteristics

2.Measurement Accuracy

Meter Calibration Precision (0.05 Class / 0.1 Class)
Power Quality Test Precision

• Fundamental voltage amplitude error: ≤0.5% F.S.
• Fundamental current amplitude error: ≤1% F.S.
• Fundamental voltage-current phase difference error: ≤0.5°
• Harmonic voltage content error: ≤0.1%
• Harmonic current content error: ≤0.2%
• Three-phase voltage unbalance degree error: ≤0.2%

Secondary Load Test Precision

• Conductance G: ±(1%×G + 1%×δ ±0.01) mS
• Susceptance δ: ±(1%×δ + 1%×G ±0.01) mS
• Apparent power S: ±(1%×S ±0.1) VA

3.Standard Energy Pulse Constant

2.3 Environmental & Insulation Parameters

Hardware & Structural Design
1.Integrated engineering plastic housing with foldable rear support, supporting handheld and desktop dual operation modes; equipped with fixing strap for stable handheld measurement.
2.30-key silicone touch keyboard with dedicated shortcut keys F1-F5 for rapid page switching; full graphical LCD with real-time date, time, battery level and gear status display.
3.Multi-channel independent terminal layout, separating voltage, current, pulse and communication interfaces to avoid signal crosstalk during field testing.
4.Built-in non-volatile mass storage, data will not be lost after power failure; multiple data export channels including RS232, USB and optional WIFI/Bluetooth.
5.Optional barcode scanner realizes one-click automatic entry of meter serial numbers, eliminating manual numeric input errors.
6.Independent lithium battery power supply, supporting continuous field operation without external mains power.
 

Measurement & Calibration Performance
1.Supports live-load on-site calibration without power cut-off, no disassembly of metering loops, no modification of original metering equipment.
2.Simultaneously calibrate single-phase, three-phase three-wire and three-phase four-wire active/reactive energy meters (1A/5A rated current); support simultaneous error detection of main and auxiliary meters.
3.Three pulse sampling modes: optical sampling, manual trigger, wired pulse line, compatible with mechanical disc meters and electronic smart meters.
4.Built-in CT for high-precision laboratory calibration; clamp CT for quick field wiring without breaking secondary current circuits.
5.Real-time synchronous measurement of voltage, current, active/reactive power, phase angle, power factor and frequency, automatically calculate metering comprehensive error.
 

Wiring Diagnosis & Power Quality Analysis
1.Vector diagram real-time display function, visually judge three-phase wiring correctness; automatically identify 48 types of wrong wiring for three-phase three-wire systems.
2.Automatic correction coefficient calculation for miswiring, supporting automatic back-calculation of supplementary electricity consumption for abnormal metering circuits.
3.Real-time waveform display of single/three-phase voltage and current, equivalent to portable oscilloscope to judge waveform distortion, peak clipping and harmonic interference.
4.Harmonic spectrum analysis function, display 1~63 times harmonic content, total harmonic distortion rate (THD) of voltage and current in histogram and table format.
5.Complete power quality monitoring: frequency deviation, voltage deviation, voltage fluctuation, three-phase unbalance and harmonic index quantitative analysis.
6.CT transformation ratio test function, judge CT primary-secondary polarity and phase matching via phase angle difference.
 

Smart Meter Communication & Auxiliary Functions
1.Independent RS485 detection module, compatible with DL645-1997 and DL645-2007 communication protocols, supports 7 kinds of baud rates from 300bps to 19200bps.
2.Read full data of smart meters via 485 bus: total / sub-rate active/reactive energy, maximum demand, meter operating status, programming records, battery running time, demand cycle and sliding time.
3.Load fluctuation continuous recording function, store full-cycle electrical parameters to evaluate power quality impact of electrical equipment.
4.Dynamic parameter test of reactive power compensation and filter devices, quantitative evaluation of compensation performance indicators.
5.Built-in perpetual calendar clock, each test record automatically binds timestamp, voltage and current vector data for traceability.
6.Walk test function for energy meters, compare cumulative energy with meter mechanical counter to identify meter tampering by nameplate or gear replacement.

Three-Phase Four-Wire Measurement Principle
Adopt three independent power element measurement architecture: voltage coils connect A/B/C phase to neutral N respectively, current coils series connect A/B/C three-phase current loops. The instrument collects instantaneous voltage and current signals of each phase, calculates single-phase and total active/reactive energy, power parameters and phase angles through internal high-speed sampling chip.
 

Three-Phase Three-Wire Measurement Principle
Dual power element measurement mode: voltage loops collect Uab and Ucb line voltages, current loops only sample A and C phase currents. The internal algorithm compensates B-phase power loss mathematically to realize full three-phase electrical parameter calculation, matching standard two-element metering cabinet wiring logic.
 

Energy Meter Calibration Principle
The instrument outputs standard energy pulse via built-in high-precision transformer, collects pulse signals from tested energy meter through optical/wired/manual sampling. Compare the standard pulse count and tested meter pulse count within set calibration cycles, automatically calculate relative error of the meter, and record continuous multiple error values to output average error and standard deviation.
 

Wrong Wiring Diagnosis Principle
Collect real-time vector angles of all voltage and current signals, compare with standard vector phase sequence range (divided into inductive 5°~55°, inductive 55°~115°, capacitive -5°~-65°, capacitive -65°~-125°). Match the measured vector combination with pre-stored 48 kinds of three-phase three-wire miswiring models, output wiring judgment result and metering correction coefficient.

1.Power grid operation & maintenance: On-site regular inspection of high/low voltage metering cabinets, user energy meter error verification, abnormal wiring troubleshooting.
2.Anti-electricity theft inspection: Vector diagram diagnosis, walk test, CT transformation ratio detection to identify under-voltage, under-current, phase shifting, CT polarity reversal and other theft behaviors.
3.Power quality supervision: Harmonic, three-phase unbalance, voltage fluctuation monitoring for industrial and commercial large power consumers.
4.Transformer & reactive compensation equipment acceptance: Dynamic parameter testing of capacitor banks, filter devices, CT/PT transformation ratio verification.
5.Metrology laboratory calibration: High-precision built-in CT mode for fixed calibration of single/three-phase standard energy meters, indicating instruments (voltmeter, ammeter, phase meter).
6.Smart meter batch acceptance: RS485 communication function detection, demand error verification according to meter preset demand cycle and sliding time.
7.New energy power station inspection: Wind/solar on-site metering device testing, grid connection power quality evaluation.

Clamp Transformer Maintenance
1.Handle clamp CT gently to avoid collision and deformation of iron core, which will reduce measurement accuracy.
2.Keep clamp iron core contact surface clean without metal debris, dust or oxidation layer to ensure complete closure during measurement.
3.Do not let clamp iron core directly contact copper/aluminum busbars during live measurement to prevent short-circuit hazard and equipment damage.
 

Lithium Battery Maintenance
1.Avoid deep discharge of the built-in lithium battery; charge the device daily under normal working conditions.
2.For long-term storage without use, charge the instrument once every 2 weeks, charging time ≥4 hours each cycle.
3.If the battery is disassembled and reinstalled, connect the charger first to release the battery protection state before normal startup.
4.Do not replace the built-in lithium battery with non-matching third-party batteries to avoid circuit damage.
 

General Equipment Maintenance
1.Store the instrument in dry, dust-free environment with temperature range -10℃ ~ +40℃, avoid direct sunlight and humid outdoor storage.
2.Clean the LCD and keyboard with soft dry cloth only, prohibit corrosive liquid or water flushing.
3.All terminal ports shall be kept clean; remove dust regularly to prevent poor contact during wiring.
4.After field test, detach all test wires and clamp CT, store in matching accessory box to prevent wire breakage and clamp damage.

Large Calibration Error of Energy Meter
1.Check parameter setting: PT/CT ratio, meter constant, clamp CT range and wiring mode must match on-site actual conditions.
2.Verify clamp CT closing state and iron core cleanliness; replace with built-in CT for high-precision measurement scenarios.
3.Confirm pulse sampling channel is correctly selected (optical / wired / manual), adjust optical sensor sensitivity to avoid missing or false pulse capture.
4.Check voltage and current wiring polarity, reverse CT clamp direction if phase angle deviation reaches 180°.
 

Abnormal Vector Diagram / Wiring Judgment Failure
1.Recheck three-phase voltage sequence and clamp CT phase matching (A/B/C clamp correspond to A/B/C current wire).
2.Confirm no open circuit in secondary voltage/current loop, check fuse and terminal contact tightness.
3.Switch to electrical test page to confirm voltage and current amplitude are within normal range, eliminate missing phase fault.
 

Instrument Cannot Store or Export Test Data
1.Check storage capacity, delete redundant historical records via history data page.
2.Verify USB/RS232 cable connection integrity, restart instrument and background management software for re-transmission.
3.For WIFI/Bluetooth remote control: confirm optional module is installed correctly, re-match tablet terminal.
 

Short Battery Endurance / Unable to Charge
1.Replace the original power charger, ensure charging voltage matches equipment specification.
2.Charge continuously for more than 6 hours, if battery still fails to hold charge, contact manufacturer for battery replacement.
3.Avoid long-term high load operation without charging, reduce deep discharge frequency.
 

485 Communication Reading Failure
1.Select matching DL645 protocol version and baud rate according to tested smart meter parameters.
2.Check 485 wiring positive/negative polarity, eliminate open circuit or short circuit of communication line.
3.Adjust meter communication address setting, re-initiate data reading operation on Test_485 page.