A development system and method are provided for testing proximity sensor interfaces, such as a capacitive switch assembly which may be employed in an automotive vehicle. The stress reducing agent reduces stress in the plated rhodium, increasing the thickness of the rhodium that can be plated without cracking. In addition, irradiation with light having a short wavelength is performed concurrently with the heat treatment, whereby elimination of hydrogen, OH, or the like is promoted. In addition, the ATD integrator can be employed as a standalone circuit for use whenever a signal transition is to be delayed.