Operating In Time-Of-Flight Mode; Zooming On A Gate - Olympus EPOCH 650 User Manual

DMTA-10055-01EN, Rev. A, February 2015
7.6

Operating in Time-of-Flight Mode

The EPOCH 650 ultrasonic flaw detector is capable of displaying time-of-flight (TOF)
sound path data for a gated indication. Time-of-flight is the location of the reflector in
terms of microseconds.
The time-of-flight mode does not divide the measurement reading value by two. The
entire time-of-flight through the test piece in both directions is displayed.
When the instrument is set up to display distances in time-of-flight mode, the Basic >
Velocity parameter becomes inactive. This is because the time-of-flight mode does not
use the material velocity to calculate sound path measurements.
To operate in time-of-flight mode
 Select Meas Setup > Unit = µs.
In time-of-flight mode, all distance measurements are displayed in microsecond
values instead of inches or millimeters.
7.7

Zooming on a Gate

The EPOCH 650 ultrasonic flaw detector allows you to quickly zoom the screen range
to provide fine resolution of a particular inspection zone. Using zoom, the instrument
automatically uses screen delay to bring the point that corresponds to the gate start to
the left side of the screen and adjusts the displayed range to match the gate width. The
new range equals the normal gate width. The lowest achievable value of the expanded
range is equivalent to the minimum range of the instrument at the current material-
velocity setting. When the zoom is active, the zoom flag (
of the display.
To zoom on a gate
1. Select Gate 1 > Status or Gate 2 > Status (group 2/5).
2. Press On (P7 key) to activate the gate.
132 Chapter 7
)appears on the right side