The AMT Series consists of three basic parts as shown in the image. The AC field transmitter emits a signal that is modulated by the metal pattern on the rotor as it turns. The sinusoidal metal pattern on the rotor creates a signal modulation that is repetitive and predictable. This occurs as a result of varying capacitive reactance between the signal generated by the transmitter and the metal on the rotor. The field receiver uses a proprietary ASIC to convert the modulated signal into output pulses that can be read by the same circuits used to receive optical encoder output. If users have ever used digital calipers, then they are already familiar with capacitive encoding. The code generation used in digital calipers for decades is the same technology built into the AMT. This capacitive code-generation technology has been shown to be reliable, accurate, economical and rugged enough to outlast other types of optical encoders.