GE Ultrasonic USM Go Operator's Manual page 94

Chapter 3. Making Measurements
3.3 Displaying Measured Results (cont.)
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DA - Material-thickness depth from the probe-contacted side of the test-piece surface to the reflector, represented by the Gate A echo.
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DB - Material-thickness depth from the probe-contacted side of the test-piece surface to the reflector, represented by the Gate B echo.
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LA - Leg number of the reflector, represented by the Gate A echo.
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LB - Leg number of the reflector, represented by the Gate B echo.
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PA - Projection distance from the probe BIP to the reflector, represented by the Gate A echo.
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PB - Projection distance from the probe BIP to the reflector, represented by the Gate B echo.
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RA - Projection distance from the probe BIP to the reflector, represented by the Gate A echo, minus the current X-VALUE.
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RB - Projection distance from the probe BIP to the reflector, represented by the Gate B echo, minus the current X-VALUE.
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A%rA - Amplitude of the signal crossing Gate A, as a percentage of the active EVAL MODE reference amplitude.
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A%rB - Amplitude of the signal crossing Gate B, as a percentage of the active EVAL MODE reference amplitude.
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dBrA - dB equivalent height difference between the signal crossing Gate A and the active EVAL MODE reference height.
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dBrB - dB equivalent height difference between the signal crossing Gate B and the active EVAL MODE reference height.
76 USM Go Operator's Manual