GF311 Portable three phase multifunction digital phase angle tester

phase angle tester

It can be applied to electric power dispatching center, relay protection department or relay protection in power plant. Its metric division class makes it suitable for petroleum, railways and the iron and steel industries also.



  • Simultaneously measuring three-phase voltages, current, power, frequency, power factor, phase, etc.
  • Display vector map for the use of user directly.
  • Horizontal liquid crystal big screen TFT displays all electric parameters;
  • The smallest current it can measure is 1 mA, 2 mA above can display vector diagram;
  • Small volume, light weight and the operation is simple, convenient;
  • DSP digital signal processing chip, wide measuring range, high accuracy, good stability;
  • It can store data; data can be using computer software to upload for management;
  • Range switches automatically, software for be calibrated.


Electrical parameters 
Accuracy class  0.5%
Power supply AC 85-265V 50/60Hz or Li-battery 5000mAh
Communication Port RS232
Warming-up time < 5min
Power consumption ≤5VA
Voltage measurement 
U1, U2, U3 Range 0-480V
Resolution 0.001V
Accuracy 0.2%
Current measurement 
I1, I2, I3 Range 1mA-10A  or  50mA-200A or 50mA-500A
Resolution 0.5mA
Accuracy 0.5%
Active power measurement 
Active accuracy 0.5%
Reactive power measurement 
Accuracy 1%
Phase measurement 
Range 0°-359.9°
Resolution 0.001°
Accuracy 0.1° 
Frequency measurement 
Range 45-65Hz
Resolution 0. 001Hz
Accuracy 0.01Hz
Power factor measurement 
Range -1 to 0 to +1
Resolution 0.0001
Accuracy 0.01
Mechanical parameters 
Dimensions (W×D×H) (mm) 245×162×60
Weight (kg) 1 (mains)
6.5 (appendix and box)
Environmental conditions 
Working temperature -10°C to 55°C
Working humidity 15%-85%RHD
Storage temperature -25°C to 70°C
Storage humidity 5%-95%RHD

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