DMTA-10084-01EN, Rev. 2, November 2018
Chapter 6
66
P/E
Used to select pulse-echo mode, where a single element transducer sends and
receives the ultrasonic signal. You must use the red T/R transducer connector in
pulse-echo mode.
Dual
Used to select pitch-catch mode, where a dual-element transducer has one
element that transmits the ultrasonic signal and another element that receives the
signal. Use the transducer connection labeled T/R as the transmit connector.
Thru
Used to select the thru-transmission mode, where two separate transducers are
typically located on opposite sides of the test specimen. One transducer transmits
the ultrasonic signal, the other receives. Use the transducer connection labeled
T/R as the transmit connector.
To compensate for the one-way sound path in thru-transmission (Thru) mode, the
EPOCH 6LT does not divide transit time by two when calculating thickness
measurements.
To select the test mode
In the pulser dialog box, press the Tab key to select Mode, and then turn the
adjustment knob to select and set a mode.
6.2.6 Pulse Repetition Frequency (PRF)
The EPOCH 6LT allows you to manually adjust the PRF from 10 Hz to 2000 Hz in
50 Hz (coarse) or 10 Hz (fine) increments. The instrument has an Auto-PRF mode to
automatically adjust the PRF based on screen range.
To select a PRF adjustment method
1. In the pulser dialog box, press the Tab key to select PRF Mode.
2. Turn the adjustment knob to select Auto or Manual.
— Auto is used to automatically set the PRF value based on the chosen screen
range.
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