Olympus Sonic 1200S/HR, Руководство пользователя

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86 Chapter 5
8. Place the transducer on the thinnest step (0.200 inch). Verify proper Gate1 and Gate2
positioning, as above (the thickness gauge starts the measurement with the 1st echo to
break Gate1, and stops the measurement with the 1st echo to break Gate2). Press the THK
CAL softkey, and rotate the SmartKnob until the THK CAL value for CAL PT1 reads
0.200 inch. Press ENTER to log this value (Please refer to
Figure 5-19 ).
9. Place the transducer on the thickest step (0.500 inch of steel). Verify proper Gate1 and
Gate2 positioning, as above (a slight adjustment of the Gate2 position may be required to
prevent triggering on unwanted signals), press the THK CAL softkey, and rotate the
SmartKnob until theTHK CAL value for CAL PT2 reads 0.500 inch. Press ENTER to log
this value.(Please refer to
Figure 5-20 ).
10. Calibration is now done. Check other thickness values to verify; if the thickness readings
are correct, the thickness gauge is calibrated. If the thickness gauge is not calibrated,
repeat calibration steps 5 through 14 (velocity of the material under test).
Gate 1 must start prior to the 1st echo (left side of echo) and the width must be wide
enough so the 1st back wall echo passes through it.