Specifications

9. Calibrating the A-scan Display

Page 66 USN52 L Operating Manual

9.5 Calibration - Angle Beam Probe

General procedure:

NOTE: This procedure requires a test block, suitable for

use with angle beam probes, which will produce reference

echo signals at two different, known, soundpath distances

from the probe. Commonly used standard blocks include

IIW, DSC, DC, and Angle Beam Calibration Block.

1. Turn on the USN52 L and set initial instrument settings per

Section 9.2.

2. Set PULSER (PULS menu) to SINGLE:

3. Set RANGE (BASIC menu) to at least the maximum thick-

ness or distance to be displayed in the A-scan:

4. Couple the probe to the test block.

5. Adjust GAIN until reference echo signals are at their desired

amplitude:

6. Adjust ZERO (S-CAL menu) to place the leading edge of the

first (from left) reference echo signal at its correct horizontal

position:

7. Adjust MTL VEL (S-CAL menu) to place the leading edge of

the second reference echo signal at its correct horizontal

position:

NOTE: Factory setting of coarse velocity #2 is close to the

shear wave velocity in steel, as measured on typical steel

test blocks.

8. Repeat steps 6 and 7 until both reference echoes are cor-

rectly positioned.

Sample specific procedure:

NOTE: The following procedure is an example only. It re-

quires a steel, IIW Type 1 test block, couplant, and a single

element angle beam probe. The A-scan will be calibrated

to a depth range of 10 inches of steel.

1. Turn on the USN52 L and set initial instrument settings per

Section 9.2.

2. Select the PULS menu:

3. Set PULSER to SINGLE:

4. Select the BASIC menu: