DO3020A Multi-functional Meters Checker, Electricity Meter Checker, Power Meter Checker \ Three-Phase AC/DC Meters Checker
DO3020A Multi-functional Calibration Instrument is a calibration device designed according to national standards and regulations, which does not require an external standard meter. It can automatically or manually calibrate single-phase and three-phase AC/DC voltmeters, AC/DC ammeters, and wattmeters below 0.5 class. Additionally, it can also perform calibration and verification on frequency meters, phase meters, power factor meters, transmitters, electrical load transformers, and power relays. This instrument features a power meter calibration function.
◆ Standard for Technical Specifications of Our Verification Instrument
JJG307-88 Specification for the Verification of AC Electric Energy Meters
JJG597-89规程 for the Verification Device of AC Energy Meters

SD109-83规程 for Electric Power Measuring Device Calibration

SD-11-83 AC Instrument Calibration Device Calibration Method

◆Main Function Description
Digital Frequency, Phase, and Amplitude Modulation; intelligent design, operation via keyboard control;
Voltage and current outputs feature constant voltage and constant current characteristics, as well as fixed frequency and phase functions.

The multi-functional standard meter features power, electrical energy, AC/DC voltage, and AC/DC current standards.
DC output is separated from AC output;

Output voltage short circuit and output current open circuit are equipped with automatic protection, along with audio-visual alerts.
Backlit LCD display for clear and intuitive viewing.

The electricity meters are inspected through programmed methods, displaying errors directly and printing the test results.
Features a software correction standard meter function, excluding the electrical energy meter.

◆Main Technical Parameters

Output voltage ranges: 30V, 100V, 200V, 400V, 600V with fine adjustment to 0.01%; each range includes an extra 20%.

Output Current Ranges: 0.1A, 0.5A, 1A, 2.5A, 5A, 10A, 20A; fine adjustment to 0.01%, each range with a 20% reserve.
Output Frequency Range: 45-65Hz, Fine Adjustment: 0.01Hz
Output Phase Adjustment: 0-360°, fine adjustment 0.1°

Phase Angle Symmetry: Three-phase four-wire voltage 120°±0.5°, three-phase three-wire voltage 60°±0.5°, current 120°±1°;
Output Waveform Distortion: Voltage and Current Waveform Distortion < 0.5%
Direct current (DC) voltage is the same as alternating current (AC) voltage, with an additional 75mv DC range.
Direct current (DC) is the same as alternating current (AC) and adds a 1mA DC step.
Output DC voltage, current ripple is ≤1%.
Output voltage, current, and power stability is 0.02%/2 (minute).
Output voltage and current meter accuracy: 0.1%; (Energy meter accuracy: 0.1%).

Output voltage and current per phase are rated at 20VA, with the rated capacity for output DC voltage and current at 15VA.
Power Supply: 220V ±10%, 50Hz ±1%; no sudden load changes on the line.

Operating Environment Temperature: -5℃ to 35℃, humidity of 85%, free of corrosive gases.
Volume: Length 350 x Width 430 x Height 190 (mm)
Weight: 25 kg
 

DO30 Series Electronic Instruments: DO30-A; DO30-B; DO30-C; DO30-D; DO30-E; DO30-E+; DO30-G; DO30-G+; DO30-G1; DO30-2; DO30-3; DO30-3a; DO30-IIB; DO30-V; DO30-VI; DO30B-1; DO30B-2; DO30B-3; DO30D; DO30J; DO30G+; DO30E+; DO30B-3; DO30A; DO30A*; DO30DQ; DO3020A; DO30E-I; DO30-Q; DO30-I; DO30-II
D030 Series: D030-A; D030-B; D030-C; D030-D; D030-E; D030-E+; D030-G; D030-G+; D030-G1; D030-2; D030-3; D030-3a; D030-IIB; D030-V; D030-VI; D030B-1; D030B-2; D030B-3; D030D; D030J; D030G+; D030E+; D030B-3; D030A; D030A*; D030DQ; D03020A; D030E-I; D030-Q; D030-I; D030-II
Series XF30 Electronic Instruments: XF30A; XF30A-1; XF30A-2; XF30A-3; XF30A+; XF30B-1a; XF30B-2; XF30B-3; XF30DA; XF30DQ; XF30-I; XF30-Ia; XF30-II; XF30Q-2; XF30ZA-1; XF30ZA