Olympus Sonic 1200S/HR, Руководство пользователя

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32 Chapter 3
5. Choose the RCVR DISPLAY mode which gives the best signal response.
6. Using a standard step block with graduated steps of at least 0.100" and 0.500", make the
following instrument adjustments:
a) Move the transducer to the 0.100" step
b) Adjust the timebase DELAY until the first echo falls on the 2nd graticule line
(0.100").
c) Move the transducer to the 0.500" step
d) Adjust the timebase VELocity until the first echo falls on the 10th graticule line
(0.500").
e) Repeat the above adjustments and checks until the echoes fall on the correct graticule
lines.
The calibration may be checked by testing other steps and verifying that the echoes fall on the
correct lines.
3.4.2 Go - Weld Inspection
1. Calibrate the search unit reference level sensitivity using a calibrated reference block.
2. Adjust the RCVR GAIN in accordance with the inspection code. The weld may now be
inspected using the scanning pattern indicated by code. Flaw location and sizing may be
done using traditional methods.
When using the thickness gauge for flaw location:
1. Change the THICK T-GAUGE to IP-1 (IP to 1st echo).
2. Adjust the T-VEL to the welded material velocity.
3. Set the OFFSET to the wedge thickness (to find the wedge offset in µs, divide the wedge
thickness by the wedge velocity) or use a calibration plate to find wedge offset.
4. From the ANGLE menu, set TRIG=ON.
5. Set the angle beam ANGLE to the wedge angle.
6. Change the angle beam THICKness to the plate or wall thickness.
7. Adjust the GATE1 POSN to cover the weld area.
8. Adjust the GATE1 LEVEL to approximately 70% of the reference level.
9. If a flaw is detected, adjusting the gain to determine flaw size will cause the defect echo to
cross the flaw gate.