910-269-EN, Rev. B, June 2011
276 Chapter 17
The majority of initial instrument setups in phased array mode are accomplished
using the Beam setup page accessible by choosing 1/5> PA Probe
> Beam. Automatic
probe identification or manual probe definition allows to easily set appropriate
parameters for the selected phased array transducer, wedge, and inspection type. For
more information on using the Beam setup page, see section
12.2 on page 240.
To set up the EPOCH 1000 Series phased array mode before calibrating
1. Use the Beam setup page to define the probe, wedge, geometry, focal laws and
other general inspection items.
2. Press [GAIN] to select an initial gain value that is appropriate for the calibration
and adjust the value by using the [UP] and [DOWN] arrows or the adjustment
knob. If the appropriate gain level is unknown, set the initial gain to 12
dB and
adjust it as necessary during calibration.
3. Use the Range parameter to set the range based on the sound path range within
the selected calibration block.
Always use the steepest angle to select the maximum range for calibration. This
ensures full coverage across all focal laws during calibration.
17.2 Calibration Types
The EPOCH 1000 Series phased array mode requires up to three types of calibration
to be performed to attain accurate distance and amplitude measurements across all
focal laws within the angular coverage area (sweep). These three calibration types are
described in the following sections.
17.2.1 Velocity
The Vel oc it y calibration type allows you to properly calibrate for the velocity of
sound within the test material. This calibration type can only be performed using a
single reflector of known sound path (typically the arc or back wall of a test block).
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