calibration of UT devices

hello , i'm an instrumentation technician with not much experience on NDT, i need some help regarding the calibration of UT equipment ( USM 36, EPOCH 650, .... ) i did bought the necessary equipment ( oscilloscope, signal generator, lead ....), new i have to perform the calibration, i will appreciate if anyone could help me by sharing the procedure or asiste me technically by video or phone call thank you by advance