63
Appendix
Ⅳ
Definition of Measurement Point Data
Data
Definition
Sa
Sound path of first echo inside Gate A
Sb
Sound path of first echo inside Gate B
Sa-b
Sound path difference between first echo inside Gate A and Gate B
Sa-a
Echo spacing inside Gate A
Ha%
Amplitude of highest echo inside Gate A (in percentage)
Hb%
Amplitude of highest echo inside Gate B (in percentage)
Ha dB
Difference between amplitude of echo measurement point inside
Gate A and gate threshold (in dB)
Hb dB
Difference between amplitude of echo measurement point inside
Gate B and gate threshold (in dB)
R-start
Starting position on the screen, that is, "DISP DELAY" settings
R-end
Ending position on the screen, that is, actual value of " range"
Da
Depth from the test-piece surface (the probe-contacted side) to the
reflector represented by the first echo in Gate A
Db
Depth from the test-piece surface (the probe-contacted side) to the
reflector represented by the first echo in Gate B
Pa
Projection distance from the probe’s front edge to the reflector
represented by the first echo in Gate A
Pb
Projection distance from the probe’s front edge to the reflector
represented by the first echo in Gate B
Ra
Projection distance from the probe’s beam incident point to the
reflector represented by first echo in Gate A
Rb
Projection distance from the probe’s beam incident point to the
reflector represented by first echo in Gate B
DAC dB
dB difference between echo magnitude inside the gate and rating
line of DAC
AVG dB
dB difference between echo magnitude inside the gate and rating
line of AVG
