Table of Contents

Overview

The HF-MT-502 three-phase energy meter field calibrator is professionally developed for on-site inspection of operating status and fault diagnosis of metering devices in high-voltage power grids. Adopting high-precision built-in transformers and clamp-on transformers for signal sampling, the instrument enables technicians to measure meter errors and wiring faults rapidly, safely and reliably. It provides solid technical support for power utilities to detect electricity theft, leakage loss, troubleshoot metering defects, conduct accurate metering calculation and recover lost electricity charges.

This calibrator adopts a mainstream ARM processor with a 168MHz main frequency and 128M memory expandable to a 4G storage card. Equipped with a 7-inch high-definition color touch screen and an EmWin display interface, it delivers a user-friendly interface with simple operation and full-touch control (no physical keyboard required). It supports a complete file system for seamless data connection with computers.

Functions & Features

Detects errors of metering devices without power cut or rewiring of metering loops to judge equipment faults.
Measures voltage, current, power, phase angle, power factor, frequency and other electrical parameters to accurately locate faults in metering circuits.
Measures CT ratio error and phase angle (optional function).
Displays vector diagrams of three-phase voltage and current for intuitive identification of wiring errors on metering equipment.
Adopts clamp-on transformers for current loop measurement, allowing fast, convenient, safe and reliable testing without breaking the current circuit.
Tests comprehensive errors of reactive energy meters without altering existing wiring.
Integrated waveform display and harmonic analysis function. It displays voltage and current waveforms of each channel individually or simultaneously, analyzes the content and amplitude of the 1st to 32nd harmonics, and generates harmonic bar charts.
Built-in EmWin operating system with full Pinyin Chinese input support. The 7-inch true-color LCD supports full-touch operation and optional keypad control for ergonomic operation. Multiple electrical parameters can be displayed on one screen.
Supports DBF database query, USB flash drive data export, and direct opening of Excel files without dedicated backend software.

Technical Specifications

Category	Technical Index	Parameter Value
Input Characteristics	Voltage measurement range	2~450V, with automatic range switching
	Clamp-on current transformer measuring range	0.1~5A (20A, 100A, 500A available as optional configurations)
	Phase angle measurement range	0 ~ 359.9°
	Frequency measurement range	45 ~ 55Hz
Accuracy	Calibrator accuracy class	0.05
Operating Environment	Operating temperature range	-20°C ~ +50°C
Power Supply	Operating input voltage	85V ~ 265V AC
	Total power consumption	≤3VA
Physical Parameters	Dimensions (L × W × H)	320mm × 270mm × 140mm
	Weight	3kg
Insulation Performance	Insulation resistance between voltage/current input terminals and instrument casing	≥100MΩ
	Withstand voltage performance of working power supply input terminals	Withstands power-frequency AC voltage of 2kV (RMS) for 1-minute test against the outer casing

FAQ for Portable Three-Phase Meter Tester

Q1: What is the Portable Three Phase Meter Tester mainly used for?

A: It is used for on-site live calibration of three-phase watt-hour meters, checking wiring faults, vector diagram analysis, harmonic detection, CT ratio error test, electricity theft investigation and metering error troubleshooting for power system metering devices.

Q2: What is the accuracy grade of this tester?

A: The instrument accuracy class is 0.05, meeting high-precision field calibration requirements for metering devices.

Q3: Do we need to cut off power for field testing?

A: No power outage required. Equipped with clamp-on current transformers, testing can be completed without disconnecting the current secondary loop safely and quickly.

Q4: How to quickly identify incorrect meter wiring?

A: The device displays three-phase voltage and current vector diagrams, which can visually judge reversed wiring, missing phase and wrong phase sequence faults.

Q5: Can it calibrate reactive energy meters?

A: Yes, it can test the overall error of reactive power meters without modifying on-site wiring.

Q6: Does the tester support harmonic analysis?

A: It supports real-time voltage/current waveform display, analyzes 1~32nd harmonic amplitude and proportion, and generates harmonic bar graphs.

Q7: What are the screen operation methods?

A: 7-inch true-color touch LCD with EmWin system, full-touch operation as standard, physical keyboard available as alternative, supports Chinese Pinyin input.

Q8: How to export measured test data?

A: Built-in DBF database, support USB flash drive export; exported files can be opened directly with Excel, no dedicated upper computer software required.

Q9: What is the voltage measurement range?

A: 2V~450V AC with automatic range switching to adapt to various voltage level metering loops.

Q10: What are the specifications of the clamp-on current sensor?

A: Standard measuring range 0.1~5A; optional clamp sensors of 20A, 100A, 500A for different working conditions.

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HF-MT-502 Portable Three-Phase Meter Tester