Inductance control system

A test system comprising:

• a device interface board (DIB) to connect to devices under test (DUTs);
• an interposer to connect to the DIB;
• a current source;
• and
• a polarity inverter to receive current from the current source and to control a directional flow of the current relative to the interposer;
• the polarity inverter comprising:
• multiple contactors, each of the multiple contactors comprising switches that are controllable to configure a current path, each of the multiple contactors comprising contacts, the contacts being interleaved such that first contacts to receive voltage having a first polarity alternate with second contacts to receive voltage having a second polarity, the first polarity and the second polarity being different;
• a first conductive plate to connect electrically to each of the first contacts;
• a second conductive plate to connect electrically to each of the second contacts, the first conductive plate and the second conductive plate being in parallel;
• and
• a dielectric material between the first conductive plate and the second conductive plate.