Specifications

USN52 L Operating Manual Page 63
9. Calibrating the A-scan Display
Sample specific procedure:
NOTE: The following procedure is an example only. It re-
quires a steel, 1 inch thick test block (for example, an IIW or
step block), couplant, and a single element contact probe.
The A-scan will be calibrated to a depth range of 5 inches of
steel.
1. Turn on the USN52 L and set initial instrument settings per
Section 9.2.
2. Select the PULS menu:
or
3. Set PULSER to SINGLE:
4. Select the BASIC menu:
5. Set RANGE to 5.000 in:
6. Select the S-CAL menu: or
7. Couple the probe to the test block.
8. Adjust GAIN as necessary throughout this procedure to keep
reference echo signals at suitable levels (see illustration at
right):
,
9. Adjust ZERO to place the leading edge of the backwall echo
signal at the second vertical graticule division (see illustration
at right):
10. Adjust MTL VEL to place the leading edge of the fourth
backwall multiple at the tenth vertical division (see illustration
below):
,
11. If necessary, repeat steps 9 and 10 until all echo signals are
positioned horizontally as shown in the following illustration.
A-scan Calibrated for 5 Inch Range