1. The amplitude of the reflected echo of the artificial sharp groove can be adjusted to 50% of the full scale of the fluorescent screen directly on the comparative test block as the reference sensitivity.
2. For the inner and outer surface processing slot comparison test blocks, the echo amplitude of the inner surface slot shall be adjusted to 80% of the full scale. Then the reflection amplitude of the outer surface slot shall be marked on the fluorescent screen to make a distance. Amplitude curve.
3, the detection sensitivity should be 6dB higher than the reference sensitivity.