Voltage (U) ±0.1% 0.001V
I1, I2, I3, I4 5A/1A ±0.1% 0.001A
P, Q, S 5A/1A ±0.2%0.001k 
kWh, kVAh 5A/1A IEC 62053-22 Class 0.2S 0.1kXh 
kvarh 5A/1A IEC 62053-24 Class 0.5S IEC 62053-23 Class 2 0.01kvarh PF 5A/1A ±0.2%  0.001
Phase Angle ±1° 0.1°
Freq., Freq. Deviation ±0.003 Hz 0.001Hz
U Unbalance ±0.1% 0.01% 
I Unbalance ±0.5% 0.01%