Gate Measurements And Alarms - Olympus EPOCH 650 User Manual

11.8.6

Gate Measurements and Alarms

The interface gate does not allow the same standard measurements as gate 1 and
gate 2. The interface gate only measures the thickness of a given indication, when
applicable.
Individual gate alarms can be set while the interface gate is active. The negative
threshold alarm is most common when looking for interface echo drop-out. For more
information about setting up gate alarms, see "Gate Alarms" on page 133.
11.9 Corrosion Module
The EPOCH 650 ultrasonic flaw detector Corrosion Module provides a rapid and
simple solution for flaw detector users to perform basic corrosion inspections. This
feature provides simplified instrument operation for corrosion applications, requiring
less set up time and more efficient data collection. The Corrosion Module leverages
many of the inspection features used in dedicated corrosion thickness gages while
maintaining a close connection to standard flaw detector operation.
Once the appropriate preset dual transducer is selected, the Corrosion Module
automatically adjusts the pulser and receiver settings to optimize the ultrasonic setup.
Measurement thresholds and gain adjustments are also handled automatically,
allowing immediate thickness measurements with minimal operator intervention.
11.9.1 Key Features
Several key features are included in the EPOCH 650 ultrasonic flaw detector
Corrosion Module that vary from standard flaw detector operation.
• Automatic Zero
Automatic Zero corrects for internal electronic delays, cabling delays and
transducer delays to the end of the delay line. Automatic Zero calculates the zero
offset of the system by measuring the time-of-flight of sound through the end of
the delay material on the connected dual probe. While this measurement does not
correct for couplant variation or surface conditions of the test piece, it calculates
the majority of the zero offset value required for accurate material measurements
before you couple the transducer to the test piece.
• Automatic Gain Compensation
Automatic Gain Compensation (AGC) allows the EPOCH 650 to acquire
consistent measurements. The AGC continuously optimizes the most prominent
DMTA-10055-01EN, Rev. A, February 2015
Software Features and Options 275