Epson manual USN 52R/USN 52L calibration, Calibration of display range

USN 52R/USN 52L calibration Operation

5.3 USN 52R/USN 52L calibration

Calibration of display range

Before you operate the instrument, you must calibrate it. Depending on the material and the dimensions of the test object, the sound velocity and the calibration range have to be set and the probe delay taken into consider- ation. In addition, the test sensitivity has to be adjusted according to the specified requirements.

AAttention:

In order to reliably operate the instrument, adequate training in ultrasonics is required.

Calibration guarantees that

–the total thickness of the test object is displayed,

–the distance to the flaw or to the backwall of the test object can be determined using the horizontal position of the echo, or it can be digitally displayed,

–all flaws are displayed which must be detected according to test specifications,

–the size of the flaw can be determined by comparison with a known reflector.

HNote:

For all calibration procedures, use a calibration block which is made of the same material and has the same temperature as your test object.

The following examples show three main methods of ultrasonic testing:

•Testing with a straight-beam probe,

•Vertical testing with a dual (T/R) probe,

•Angle beaming with an angle-beam probe (transverse waves).

With all calibrations you must

–set the pulser and receiver according to the test task and

–decide whether you are going to use the FLANK or PEAK mode for your measurements (MEASURE function int the lower operating level) before calibrating.

Krautkramer USN 52R/USN 52L Issue 05, 02/00 5-17