Signal frequency conversion preposition module of portable intelligent four-channel partial discharge detector

The present invention discloses a signal frequency conversion preposition module of a portable intelligent four-channel partial discharge detector. The module provided by the invention comprises a signal selective switch, a three-way AMP amplifier, a three-way filter and a frequency converter. The signal selective switch is an automatic selective switch or a manual selective switch; the automatic selective switch receives signals transmitted by an ultrahigh-frequency UHF sensor, a high-frequency pulse current HFCT sensor and an ultrasonic AE sensor; the signals are amplified by the AMP amplifier, then filtered by a corresponding filter and converted by the frequency converter to 1-100MHz signals for outputting; and the converted signals are subjected to detection and A/D conversion and are displayed and calculated by a personal computer. The signal frequency conversion preposition module of a portable intelligent four-channel partial discharge detector is able to reduce the system complexity of a partial disc