Epson USN 52R, USN 52L manual Calibration with a straight-beam probe

Operation USN 52R/USN 52L calibration

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

5-18 Issue 05, 02/00 Krautkramer USN 52R/USN 52L