This video demonstrates how to measure the depth of an EDM notch using the tip diffracted signal.
Equipment: Olympus EPOCH 1000i UT tester, 45 degree, 4Mhz, 10mm diameter transducer and a carbon steel bar that contains a 0.300" high ID connected EDM notch.
I work at Central Piedmont Community College in Charlotte, NC. Please visit our website to explore your NDE training needs.
Central Piedmont Community College NonDestructive Examination Technology Program
https://www.cpcc.edu/programs/nondestructive-examination-technology
Central Piedmont Community College NonDestructive Examination Technology Program College Catalog
http://catalog.cpcc.edu/programsofstudy/collegelevelprograms/associateinappliedscienceaasdegreesdiplomasampcertificates/nondestructiveexaminationtechnology/