A.100V B.500V C.2500V D.2000V
A.±0.05%、±0.2′ B.±0.025%、±1.5′ C.±0.03%、±1.5′ D.±0.05%、±1′
A.±2.5% B.±2.0% C.±3.0% D.±3.5%