Epson USN 52L manual Preparing the instrument for digital measurement, Preconditions, Gate Logic

USN 52R/USN 52L calibration Operation

Operation:

–In the function CAL press N and Osimultaneously. The function is now enabled.

–REC 0 is displayed, indicating that no calibration echo has been recordet yet.

–Set the gate onto the first calibration echo and enter the sound path in S-REFusing M.

–Save the first calibration echo using M in the CAL function. On the display: REC 1.

–Set the gate onto the second calibration echo and enter the sound path in S-REFusing M.

–Save the second calibration echo using M in thte CAL function. On the display: REC 2.

–Press Oon CAL again to terminate the 2-step calibration procedure.

Automatic calibration is carried out after the instrument has calculated the entered parameters and made a plausibility check.

HNote:

To verify a correct instrument calibration, always check

the setting using the echo of a known distance, other than those used for calibration.

Preparing the instrument for digital measurement

USN 52R/USN 52L must be calibrated to the material to be tested in order to give the correct measurement readings.

HNote:

For all calibration procedures, use a calibration block with a known thickness, made of the same material and having the same temperature as your test object.

Preconditions:

To start with, calibrate the A-scan display as described in the preceding section. Carry out the following basic settings:

GATE LOGIC:

POSITIVE, NEGATIVE or MEASURE

MEASURE: 0 TO 1st – for measurement to the first echo in the gate. By this, the thickness or the flaw posi- tion can be measured.

Krautkramer USN 52R/USN 52L Issue 05, 02/00 5-23