MEDN-3T Three-Phase Electric Energy Meter Calibration Device Send email to us

1. Instrument Features
1) Integrated meter-source design incorporates a built-in 0.05-class three-phase wide-range multifunction digital standard meter. All electrical parameters of the standard meter can be read via software.
2) Utilizes the latest DDS technology, 36,000-point waveform synthesis technology, large-scale CPLD, and a 32-bit embedded system. The signal source output features high stability, fine adjustment, and low distortion.
3) Features a 7-inch color touchscreen LCD with the latest RAM system, displaying comprehensive information including three-phase voltage, current, active power, reactive power, and apparent power. Also displays power vector diagrams, waveform analysis charts, and other functions.
4) Incorporates a compact, high-efficiency PWM digital power amplifier with over 90% efficiency and a 300kHz carrier frequency, offering low distortion, minimal heat generation, and high efficiency.
5) Comprehensive protection functions include voltage short-circuit alarm, current open-circuit alarm, and overload alarm.
6) Built-in high-stability temperature-compensated crystal oscillator outputs 500KHz high-precision pulses for testing electricity meter clocks. When paired with meter calibration management software, it can measure daily timing errors, time-of-use switching errors, etc. (Optional feature)
7) Equipped with a 485 communication interface to perform various communication tests on multifunction meters. (Optional feature)
8) Capable of automatic meter calibration without a computer via built-in protocols, storing data for over 10,000 meters.
9) Features a USB port for automatic firmware upgrades via flash drive, exporting stored data, and direct device operation with an external mouse.
2. Primary Functions
1) Creep test
2) Starting test
3) Basic error
4) Harmonic function
3. Multifunctional Tests (Requires management software)
1) Influence quantity test
2) Indicated value error
3) Daily time measurement error
4) Maximum demand error
5) Communication protocol consistency check
6) Time-of-use switching error

1. Device Class: Class 0.05, Class 0.1
2. Computer Interface Port: RS232 Communication Port
3. Three-Phase Source Technical Parameters:
1) Output Voltage:
3 × 57.7V Y        3 × 100V ∆
3 × 220V Y         3 × 380V ∆
2) Adjustment Range: 0–120% continuously adjustable
3) Adjustment Resolution: Better than 0.01%
4) Output Current: 25mA, 0.1A, 1A, 5A, 25A, 100A  
5) Adjustment Range: 0–120% continuously adjustable; Adjustment Resolution: Better than 0.01%
6) Minimum output current: 1mA (Accuracy: <5%)  
7) Output power: (Voltage circuit) 3×50VA  
            (Current circuit) 3×150VA  
8) Output voltage, current, power stability: ≤0.02%/120S  
9) Output voltage, current waveform distortion: ≤0.5%
10) Three-phase symmetry: Better than 120° ± 0.3°
11) Frequency range: 45Hz to 65Hz  Adjustment resolution: 0.01Hz
12) Phase shift range: -180.0° to 180.0°  Adjustment resolution: 0.01°
13) Indicator meter class: Voltage and current meter accuracy ±0.01%
                 Phase meter accuracy: ±0.01°
Frequency meter accuracy: ±0.01Hz
4. Built-in Three-Phase Standard Meter Technical Parameters:
1) Voltage Input
① Input Range (V): 40-480
② Input Ranges (V): 60, 120, 240, 480
③ Overload Capacity (V): 600
④ Input load: ≤0.5mA (480V)
2) Current Input
① Input range (A): 0.01~100
② Input ranges (A): 100, 50, 25, 10, 5, 2.5, 1, 0.5, 0.25, 0.1, 0.05, 0.025
③ Overload Capacity (A): 150
3) Accuracy
① Accuracy Class: 0.05 (0.1A~120A)
② Power Measurement Accuracy
a. Active Power Measurement Accuracy: 0.05%/0.1% (PF≥0.5)
b. Reactive Power Measurement Accuracy: 0.1%, 0.2% (PF≥0.5)
③ Energy Measurement Accuracy
a. Active Energy Measurement Accuracy: 0.05%, 0.1% (PF ≥ 0.5)
b. Reactive Energy Measurement Accuracy: 0.1%, 0.2% (PF ≥ 0.5)
5. Comprehensive Protection Features: Voltage short-circuit, current open-circuit protection, load overload protection; display overvoltage protection.
6. Capable of conducting 2nd to 21st harmonic tests, voltage interruption and sag tests, with adjustable harmonic amplitude.
7. Power supply: 230V ±10% / 50Hz
8. Maximum power consumption: 300VA
9. Operating environment: Temperature 20°C ±5°C, relative humidity ≤85%