Olympus Sonic 1200S/HR, User Manual

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Applications 87
Figures 19 and 20
5.2.7 Manual Echo-to-Echo Mode Calibration
To calibrate the gage using Manual Echo-to-Echo mode, follow instructions for AUTO Echo-
to-Echo calibration (see above) and instead of calibrating thickness using PT1 and PT2, do as
follows:
1. From the THICK Menu, set VELOCITY according to nominal material velocity.
2. Place the transducer on the thin block and adjust OFFSET for the block value.
3. Place the transducer on the thick block and adjust the THICK VELOCITY for that value.
4. Repeat as necessary.
5.3 Delay Line Thickness Testing
In testing thin materials with smooth surfaces, the use of a wideband delay line transducer is a
good method. The delay through the plastic enables better resolution. Thicknesses down to
0.010 inch can be resolved, since the delay moves the echoes away from the initial pulse
ringing, as shown in
Figure 5-21.
The range is limited by the delay in the plastic as the 2nd echo will interfere with the multiple