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General
This Work Instruction is with the ultrasonic thickness
tester "TM1D" which is only accurate in a thickness range from about .5
mm to 8 mm due to the frequency and size of the transducer,
and is accurate on a curved surface down to around 3.5 mm Rad.
Instructions
- Ensure temperature of test standard and part to be
thickness tested are within 10 degrees F of each other and isn't in
the process of changing.
- Plug in transducer into top of "TM1D".
- Turn "TM1D" on.
- Calibrate on STANDARD of like alloy and known thickness
and Rad.
- with enough couplant to eliminate any air pockets
between the transducer and the part to be measured, hold the transducer
"steady and square" on the part with about 3 to 6 oz. pressure.
Note: When reading the "TM1D" all 5 digits MUST remain
the same, without the "NO ECHO" indication showing in the upper
left corner and the screen must be solid green (no blinking) for
at least 3 seconds, to receive a valid reading!!!
- If the "TM1D" reads within .03 mm of the known
thickness, 3 times in a row, no calibration is needed. (the .03
mm allowed difference is most likely due to slight temperature variance)
- If the "TM1D" reads more than .03 mm + or -0.005
mm of the known thickness, calibrate by...
- Following step 4(i)
- While the transducer is in the position of
4(i), push the "CAL" button with your free hand. (5 blank spaces
should show up)
- Enter the correct thickness while holding
the transducer very steady (especially while pushing the last
digit).
- Hold steady until the velocity numbers show
up on the screen.
- Repeat steps 4(iii) (a) through 4(iii) (d)
once again.
- Now that the machine is calibrated, follow step 4(i)
to obtain thickness keeping in mind the "NOTE".
Liquid Dynamics International
Issue No.: 3
Amendment No.: 0
Date: July 29, 1996
Approved: MRP
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