Specifications

USN52 L Operating Manual Page 97
14.1 Before Taking Measurements
The measurement line of the USN 52 L provides a digital display
of wall thickness or distance to flaw along the
soundpath.
Before digital readings can be taken:
1. Select a probe that is suitable for the application.
2. Select the proper MEASURE mode, 0 TO 1st or
MULTECHO. See Section 13.1 for descriptions.
3. Select TOF mode, PEAK or FLANK. Refer to Section 13.9
for selection criteria.
4. If thickness measurements only will be taken, and the visual
alarm is not needed, set GATE LOGIC function (lower level)
to MEASURE (ref. Section 10.2, Setting Gate Logic).
5. Calibrate the A-scan display according to the applicable pro-
cedure in Chapter 9.
6. Calibrate the digital measurement display according to the
procedure in Chapter 13 for the selected probe type and
MEASURE mode.
14.2 Taking Digital Measurements
NOTE: This procedure applies to measurement of parts at
ambient temperature. Special procedures may be required
for objects with elevated surface or internal temperatures.
Use the following procedure when measuring wall thickness or
distance to a discontinuity:
1. Remove any dirt, loose scale, or flaking from the test sur-
face.
2. Apply a small amount of couplant to the surface of the part.
3. Place the probe on the surface with even, but not excessive,
pressure.
4. Observing the A-scan display and S= value in the measure-
ment line, obtain maximum echo signal amplitude and a stable
digital readout.
5. Read the digital measurement.
14. Digital Thickness / Distance Measurement