DMTA-10084-01EN, Rev. 2, November 2018
Calibration
89
8. Calibration
Calibrating the EPOCH 6LT is the process of adjusting the unit so that it measures
accurately on a particular material, using a particular transducer at a particular
temperature.
In calibrating the instrument, you set the zero offset and velocity parameters. The zero
offset (sometimes referred to as probe delay) is set to compensate for the dead time
between the firing of the main pulse and the entry of the sound into the test piece. The
velocity is set so it matches the material velocity of the test piece.
The EPOCH 6LT features advanced auto-calibration that provides for a fast and easy
calibration process. This section details the example procedures to calibrate the
EPOCH 6LT using the two basic transducer configurations: straight beam and angle
beam.
8.1 Basic Setup
Until you are completely comfortable operating the EPOCH 6LT ultrasonic flaw
detector, we recommend using a basic setup procedure before starting the actual
calibration.
To setup the EPOCH 6LT before calibrating
1. In the Gain adjustment box, set an initial gain value that is appropriate for the
calibration (see “Adjusting the Gain (System Sensitivity)” on page 59 for
instructions on using the Gain adjustment box).
If the appropriate gain level is unknown, set the initial gain to 20 dB and adjust it
as necessary during calibration.
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