Epson USN 52L User Manual

Page 63

5-18

Issue 05, 02/00

Krautkramer USN 52R/USN 52L

Recommendation:

As long as the echoes to be evaluated indicate a dis-
tinct maximum amplitude, select the PEAK mode of
measurement.

Basic adjustment:

Before calibrating the instrument, you must carry out
the following basic adjustment:

Group

Function

Setting

BASIC

DELAY

0.000 ms

RANGE

adjust

Calibration with a straight-beam probe

Known sound velocity, no delay block

– Set sound velocity MTL VEL

– Position Gate a over one of the echoes

– Adjust ZERO so that the correct “S=...”-value is

indicated in the measurement line.

Example:

Carry out the calibration on a flat calibration block V1
(thickness: 25 mm) for a calibration range of 100 mm.

– Set RANGE to 100 mm

– Set known sound velocity MTL VEL (5920 m/s)

– Position the gate over the first calibration echo out of

25 mm

– Adjust ZERO so that “S=25.0" is displayed in the

measurement line

The display range is now calibrated for the described
task.

Sound velocity unknown, no delay block

– Set MEASURE to MULTECHO

– Set the gates so that the first echo is evaluated in

Gate a and the second echo in Gate b.
Attention: Be careful of node errors when adjusting
the threshold!

– Adjust the sound velocity MTL VEL until the

displayed reading (sound path between the two
backwall echoes) corresponds to the actual
thickness of the test object. If necessary, you have
to readjust the gate parameters.

– Set MEASURE to 0 TO 1st

Operation

USN 52R/USN 52L calibration