GF333 Multifunction AC DC digital meter calibration electrical equipment

calibration electrical equipment

GF333 multifunction AC DC digital reference multimeter can be used as a calibration device standard meter in the laboratory, also as a testing calibrator in metrology testing center of grid corporation, power company and metrological department in power plant, national levels of metrological service, quality inspection departments, research institutes, tertiary institutions, industrial and mining enterprises, electric energy meter and electrical instrument production enterprises etc. The model GF333 high precision AC DC reference meter can test three phase ac voltage, current, phase angle, active power, reactive power, apparent power, energy, power factor, frequency and harmonic, also test DC voltage, DC current and DC power and transducer. The digital reference meter fully meet ISO17025 standard in the electrical laboratory.


Functions & Features

  • Transducer measurement;
  • High accuracy up to 0.02%;
  • Measure DC voltage and DC current;
  • Meet IEC60736 & IR46 & ANSI C12.20-2022 standard;
  • Measure calibration device of the magnetic induction;
  • With RS232 interface, it can be controlled by PC operation;
  • Measure calibration device the standard deviation of estimate;
  • Measure calibration device of voltage, current, power stability;
  • Using 6.5 inch TFT color LCD screen, character display clear chart;
  • Measurement range widely from 0 to 1000V & 0 to 120A AC, 0 to 1000V & 0 to 36A DC;
  • Measure the AC voltage, current 2-31 harmonic content and waveform distortion degree;
  • Using the 32 bit DSP and 24 bit low power and high speed DAC consists of high accuracy AC collector;
  • Measure the AC voltage, current, active power, reactive power, frequency, phase angle and power factor etc;
  • Measure active power energy error, reactive power energy error, the maximum output pulse frequency is to 2 MHz;
  • Have the advantages of wide measuring range, high precision, stable and reliable operation, simple operation etc.
  • Measure the voltage of the calibration device three-phase symmetric degrees, the current of three three-phase symmetric degree;


  • Power plant;
  • AMI design center;
  • Energy meter R & D;
  • Electrical laboratory;
  • Watt-hour meter factory;
  • Metrological service center;
  • ISO17025 electrical laboratory;
  • Electricity meter manufacturers;
  • Laboratories of power utilities;
  • Meter test bench integrated factory;
  • Electricity power bureau & power company;
  • National Metrology and testing department;
  • Electrical Department of industrial and mining enterprises;


Electrical parameters 
Accuracy class  0.02%, 0.05%
Power supply AC 220 V±10% or 110 V±10%, 50/60Hz
Power consumption <30VA
Warming-up time <30min
Voltage measurement 
U1, U2,U3 6.25V, 12.5V, 25V, 50V, 100V, 200V, 400V, 800V (switch automatically), max 1000V
Range (0-120%)RG
Resolution 0.01%RG
Accuracy 0.02%RD or 0.05%RD
Current measurement 
I1, I2, I3 0.25, 0.5, 1, 2.5, 5, 10, 25, 50, 100A(switch automatically)
Range (0-120%)RG
Resolution 0.01%RG
Accuracy 0.02%RD or 0.05%RD
Power measurement 
Active accuracy 0.02%RD or 0.05%RD
Reactive accuracy 0.05%RD or 0.1%RD
Apparent accuracy 0.02%RD or 0.05%RD
Energy measurement 
Active accuracy 0.02%RD or 0.05%RD
Reactive accuracy 0.05%RD or 0.1%RD
Phase measurement 
Range 0.00°-359.99°
Resolution 0.001°
Accuracy 0.02° (voltage ≥50V and current ≥250mA)
Frequency measurement 
Range 45-65Hz
Resolution 0. 001Hz
Accuracy 0.001Hz
Power Factor measurement 
Range -1.00000 ~ 0 ~ +1.00000
Resolution 0.0001
Accuracy 0.0005
Electric energy pulse output  
Pulse constant range 1-2880000000
Output frequency of max. pulse 600 kHz
Load capacity >2mA
Default pulse output frequency 10kHz-600kHz
Energy pulse Input 
Input range of pulse constant 600-700000
Setting range of test pulse 1-999999999
Max. pulse receiving frequency 2MHz
Pulse input level 5V
Voltage/current harmonics measurement 
Times 2-31
Error 0.05%
Distortion degree error 0.05%
Transducer measurement 
DC voltage range ±1, ±5, ±10, ±20 V
Accuracy 0.01%
DC current range ±1, ±2.5, ±5, ±10, ±20mA
Accuracy 0.01%
Ripple error 1%
DC measurements (option) 
DC voltage 50V, 100V, 200V, 400V, 800V (switch automatically), max 1000V
Range (0 -120%) RG
Resolution 0.01% RG
Accuracy 0.02% RD
DC current 0.1A, 0.3A, 1A, 3A, 10A, 30 A(switch automatically)
Range (0-120%) RG
Resolution 0.01% RG
Accuracy 0.02% RD
LCD Display 6.5 inch color disply
Vector diagram Yes
Waveform Yes
Energy accumulation Yes
Harmonics measurement Yes
Distortion degree Yes
Self-calibration Yes
Data storage Yes
Keys Yes, 18pcs
PC software Optional
Communication port RS232
Standard IEC 62053-21,22, 23; IEC 60736; IR46; ANSI C12.20-2022;
JJG 597-2005; JJG596-2012; JJG 1085-2013; JJF 68-2019;
DL/T 826-2002; DL/T 1478-2015; DL/T 448-2016
Isolation protection IEC 61010-1:2001
Measurement Category 300 V CAT III, 600 V CAT II
Degree of protection IP40
Declaration of conformity CE & CNAS certified
Mechanical parameters 
Dimensions (W×H×D) (mm) 440×360×160
Weight (kg) 10
Environmental conditions 
Operating temperature 10°C to 30°C
Storage temperature -20°C to 65°C
Relative humidity ≤85%
Influence of external fields ≤0.05 %/mT
Temperature coefficient ≤0.0005% /℃

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