Wider impedance test range and better stability for small signal test, Built-in 0-100mA0-10V bias source (standard) or 1A bias source (optional), Diode PN characteristic detection can test all parameters of network transformer.Improved high turn ratio and weak coupling transformer test ability, To display one or two groups of primary and secondary parameters is selectable in LCR test.Flexible time-labeling system: time of file setting, calibration and deduction can be saved.