The ESA program covers DC, AC, Semi and Digital in 4 parts. Certificates are awarded for passing each of the 4 parts, DC, AC, Semi-conductor & Digital. Once all 4 certificates are earned the Associate CET is awarded. The ESA program offers advantages to student and instructors that the Associate level CET program does not offer. Once all four (4) parts of the ESA are successfully completed, the Associate CET Certificate is awarded.