Specifications

9. Calibrating the A-scan Display
Page 64 USN52 L Operating Manual
9.4 Calibration - Dual Element (TR) Probe
General procedure:
NOTE: This procedure requires either two test blocks of
different thickness or a stepped block. Reference thick-
nesses should cover the range of thicknesses or distances
to be inspected.
1. Turn on the USN52 L and set initial instrument settings per
Section 9.2.
2. Set PULSER (PULS menu) to DUAL:
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 thin section or test block.
5. Adjust GAIN until the thin section backwall echo signal is at a
suitable amplitude:
,
6. Adjust ZERO (S-CAL menu) to place the leading edge of the
thin section backwall echo signal at its correct horizontal po-
sition:
7. Couple the probe to the thick section or block.
8. Adjust GAIN until the thick section backwall echo signal is at
a suitable amplitude:
,
9. Adjust MTL VEL (S-CAL menu) to place the leading edge of
the thick section backwall echo signal at its correct horizontal
position:
,
10. Repeat steps 4 through 9 until both backwall echo signals
are correctly positioned.
Sample specific procedure:
NOTE: The following procedure is an example only. It re-
quires a steel test block with thicknesses of 0.100 and 0.500
inch, couplant, and a dual element probe. The A-scan will
be calibrated to a depth range of 0.5 inch of steel.
1. Turn on the USN52 R and set initial instrument settings per
Section 9.2.
2. Select the PULS menu:
or
3. Set PULSER to DUAL:
4. Select the BASIC menu:
5. Set RANGE to 0.500 in: