The utility model discloses a novel portable signal testing appearance, it relates to tester technical field, the reference signal generation unit generates and divide into two the tunnel with the reference signal that current frequency is the same that awaits measuring: input analog multiplier all the way, all the way through AC the DC transform circuit conversion provide reference voltage for the ADC that DC signal is the control unit, induction coil and preamble signal treatment circuit electric connection, preamble signal treatment circuit and analog multiplier electric connection, analogmultiplier and low pass filter circuit electric connection, the low pass filter circuit is connected with the control unit's ADC, the control unit and display element electric connection, the utilitymodel discloses portable, and can realize the accurate measurement, convenient to use, it is easy and simple to handle, efficient.