HDB-P / Q active / reactive combined transmitter has the same performance as active power transmitter and reactive power transmitter. Only one set of input signals can be used to measure active and reactive power at the same time. The outputs are isolated from each other and can run continuously for a long time. It is the most economical product for realizing active and reactive power measurement. This series of transmitters are suitable for single-phase, three-phase (balanced or unbalanced) lines with a frequency of 50Hz or 60Hz. They can be widely used in places where power and non-electric power systems require high power measurement to achieve system power Measurement and control. The instrument has high measurement accuracy, good conversion linearity, and good electromagnetic compatibility.