The conductivity meter has a synchronized selectable multiple-frequency sine wave current drive. The unit uses the synchronous nature of the waveform to perform sinusoidal averaging and detection for noise reduction.
The 3-phase voltage transducer boxes accept up to 250V per phase. The 3-phase current transducer boxes accept up to 10A per phase. Each phase has variable offset and gain. The output is -10 to +10VDC for use with a data acquisition system. Additionally, a TTL to CMOS conversion box was created for this project.
The electromagnet control box powers 16 pairs of electromagnets - the voltage to each pair is variable using the potentiometers. Hall effect sensors detect loss of contact between the electromagnet and its metal plate triggering the power to the electromagnet to turn off.