Complex express TEC testing

For fast (express) quality control of Thermoelectric (TE) Coolers (TEC) in manufacturing &d application, electrical resistance (R) and Figure-of-Merit (Z) measurements are widely used. Here it is shown that there are TEC damage or defect instances not covered by one-parameter testing (R) and even two-parameter testing (QZ). We offer a three-parameter approach to control TEC's quality: by measuring TEC electrical resistance (R), Figure-of-Merit (Z) and time constant (τ). This method provides possibilities to diagnose TEC defects, which is of vital concern for technology and operational conditions correction. The paper yields theoretical and experimental results proving it. The experimental check is provided with the help of the original testing device R,Z,τ-meter DX3065.