DMTA-10084-01EN, Rev. 2, November 2018
Chapter 6
64
6.2.2 Damping
The damping control enables you to optimize the waveform shape for high resolution
measurements using an internal resistive circuit. There are two damping settings on
the EPOCH 6LT ultrasonic flaw detector: 50 Ω and 400 Ω.
To adjust the damping
1. In the pulser dialog box, press the Tab key to select Damp.
2. Turn the adjustment knob to vary the value (see “Navigating Dialog Boxes and
Setup Pages” on page 19).
Generally, the lowest resistance (Ω) setting increases the system damping and
improves near-surface resolution, while the highest resistance setting decreases
system damping and improves the instrument penetration power.
Selecting the correct damping setting fine-tunes the EPOCH 6LT in order to operate
with a particular transducer selection. Depending on the transducer, the various
damping settings either improve near-surface resolution or improve the instrument’s
penetration power.
6.2.3 Pulser Type
The EPOCH 6LT has two pulser modes to choose from:
Tunable
Used to adjust the pulse width of the instrument square wave pulser for optimal
response from the connected transducer.
Min
Sets the pulse width to its minimum square wave pulse value, mimicking the
response of a traditional “spike” pulser.
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