Olympus EPOCH 1000 Series, User Manual

Page: 130 / 364

910-269-EN, Rev. B, June 2011
118 Chapter 6
The echo-to-echo mode flag appears on the right side of the display,
indicating that the instrument is measuring the distance between positions of the
indications in gate 1 and gate 2.
4. To see the measurement value, configure one of the measurement reading boxes
to display the
G2-1 parameter (see section 3.3.3 on page 71 for details).
6.7 Operating in Time-of-Flight Mode
The EPOCH 1000 Series 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 (µs).
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.
As a reminder, when taking thickness measurements, the EPOCH 1000 Series must
divide the product of material velocity and time-of-flight by two in order to calculate
the thickness of the part. If this were not done, the unit would display twice the actual
thickness because the sound energy would pass through the part twice.
When the instrument is set up to display distances in time-of-flight mode, the
1/5 > 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 3/5 > Meas Setup > Unit = µs .
In time-of-flight mode, all distance measurements are displayed in microsecond
values instead of inches or millimeters.
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