GF333B Three phase portable multifunction energy reference standard meter

three phase reference standard meter

GF333B three phase reference standard meter is a high accuracy portable reference standard energy meter used to test three phase meters and single phase meters error, it designed to work both in the field and in the laboratory. The GF333B reference meter is used to measure three phase AC energy and voltage, current, power, phase angle, harmonic and other parameters in lab, and it also can be used to integrated in the energy meter test system and supply the standard energy pulse and every measurement parameters. Its stability 0.005%/min.



  • Vector diagram function;
  • Waveform display function;
  • Energy accumulating function;
  • ISO17025 laboratory standard;
  • With big screen TFT color LCD;
  • High accuracy up to 0.04% or 0.05%;
  • Testing type: 3P4W, 3P3W, 1P2W, 1P3W;
  • With RS232 port, connection PC computer;
  • Harmonic analysis function, measurement 2nd-128th;
  • Fully automatic switching of all measuring ranges;
  • Meeting ANSI C12.1-2022 and IEC60736 & IR46 standard;
  • Wide testing range: voltage 0V-600V, current 1mA-120A;
  • Internal pulse input port, testing meter's error directly;
  • Testing mode: active power, reactive power, apparent power;
  • Designed this reference standard meter for meter test bench;


  • Power plant;
  • AMI design center;
  • Energy meter R & D;
  • Electrical laboratory;
  • Watt-hour meter factory;
  • Colleges and Universities;
  • Metrological service center;
  • 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 0.04%, 0.05%
Voltage supply 220V±10% or 110V±10%, 50/60Hz
Power consumption 15VA
Warming-up time <30min
Voltage measurement(U1 U2 U3 UN)
Range 0V-600V
Error ±0.02% (50V-600V), ±0.05% (5V-40V)
Display range 0.000000V-600.0000V
Harmonic 2nd-128st
Current measurement(I1 I2 I3)
Range 1mA-120A
Error ±0.02% (0.1A-120A), ±0.05% (1mA-0.1A)
Display range 1.000000mA-120.0000A
Harmonic 2nd-128st
Power measurement 
Active power ±0.02% (0.1A-120A)
±0.05% (0.01A-0.1A)
±0.1% (0.001A-0.01A)
Reactive power ±0.05% (0.1A-120A), ±0.1% (0.001A-0.1A)
Apparent power ±0.05% (0.1A-120A), ±0.1% (0.001A-0.1A)
Energy error 
Active energy ±0.02% (0.1A-120A)
±0.05% (0.01A-0.1A)
±0.1% (0.001A-0.01A)
Reactive energy ±0.05% (0.1A-120A), ±0.1% (0.001A-0.1A)
Apparent energy ±0.05% (0.1A-120A), ±0.1% (0.001A-0.1A)
Phase measurement 
Range 0°-360°
Error ±0.01°
Display range 0.0000°-359.999°
Frequency measurement 
Range 40-70Hz
Display range 40.0000-70.0000
Resolution 0.0005
Accuracy 0.001Hz
Power Factor measurement 
Range -1.00000 ~ 0 ~ +1.00000
Resolution 0.0001
Accuracy 0.0005
Energy pulse 
High frequency output(CH) 12000Hz
Low frequency output(CL) 5000Hz
Pulse ratio 1:1
Output level 5V
Input level 5V
Input frequency Max. 1MHz
LCD Display 6 inch color touch display
Vector diagram Yes
Waveform Yes
Energy accumulation Yes
Harmonic Yes
Self-calibration Yes
Data storage Yes
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) 480×138×486
Weight (kg) 8.5
Environmental conditions 
Ambient temperature -10°C to 45°C
Storage temperature -20°C to 65°C
Relative humidity 10%-85%
Influence of external fields ≤0.05 %/mT
Temperature coefficient ≤0.0005% /℃

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