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Instructions for Ultrasonic Thickness TestingInstructions for Ultrasonic Thickness Testing: Thin, Flat or Round Surfaces


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.


  1. 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.
  2. Plug in transducer into top of "TM1D".
  3. Turn "TM1D" on.
  4. Calibrate on STANDARD of like alloy and known thickness and Rad.
    1. 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!!!
    2. 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)
    3. If the "TM1D" reads more than .03 mm + or -0.005 mm of the known thickness, calibrate by...
      1. Following step 4(i)
      2. While the transducer is in the position of 4(i), push the "CAL" button with your free hand. (5 blank spaces should show up)
      3. Enter the correct thickness while holding the transducer very steady (especially while pushing the last digit).
      4. Hold steady until the velocity numbers show up on the screen.
      5. Repeat steps 4(iii) (a) through 4(iii) (d) once again.
  5. 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.:
July 29, 1996