... 1Hz, 0. 1 Hz Accuracy of amplitude: 0.05 Hz·Phase: 0.0o~359.99o Resolution of amplitude: 30o, 1o, 0 ... meter can be drawn out and tested separately ·13 single-phase active energy meters can be tested simultaneously ·Energy meter starting ... and creeping test· Voltage, current, phase, frequency etc output digital program-controlled adjustment ·With LCD display ...