Patent ID: 7839148

Claim:
A logging tool, comprising: a tool body; a transmitter antenna associated with the tool body; a transmitter electronics coupled to the transmitter antenna; a first receiver antenna associated with the tool body; a first receiver electronics coupled to the first receiver antenna, the first receiver electronics comprising: an attenuator circuit coupled to the first receiver antenna and an amplification circuit by way of a first transformer; and the amplification circuit coupled to the first receiver antenna by way of a second transformer; the attenuator circuit attenuates a calibration signal and thereby creates an attenuated calibration signal provided to the amplification circuit, the attenuated calibration signal provided to the amplification circuit by way of the first transformer, the first receiver antenna, and the second transformer; and a signal generator separate from the transmitter electronics, the signal generator coupled to the first receiver electronics, and the signal generator provides the calibration signal to the first receiver electronics.