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EPOCH 4PLUS
If an echo exceeds the gate threshold and the EPOCH 4PLUS is in the Amplitude mode,
the amplitude information for that echo is displayed as a percentage of Full Screen Height
as both Current Amp and Amp Max.
Figure 14 Amplitude Mode Displaying Current Amp and Amp Max
Current refers to the real time percentage of screen height of the highest amplitude signal
within the gate.
The Amplitude Max display retains the highest amplitude of a signal that has broken the
gate threshold. If a higher amplitude signal is read, the Amplitude Max value is updated.
Reset the maximum amplitude value by pressing any one of the red gate keys.
If there is no echo within the gate, Current will read “_____%” indicating no reading was
taken.
6.7 Operating Time-of-Flight (TOF) Mode
The EPOCH 4PLUS is capable of displaying Time-of-Flight (TOF) soundpath data for an
echo that breaks the gate. Time-of-Flight is the location of the reflector in terms of
microseconds (µs).
When the Time-of-Flight mode is turned on, all EPOCH 4PLUS distance parameters are
displayed using µs values instead of inches or millimeter values.
Note: Unlike other measurement modes, Time-of-Flight mode does NOT divide
the reading 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 4PLUS
must divide the product of material velocity and Time-of-Flight by two in
order to calculate the thickness of a part. If this were not done, then the unit
would display twice the actual thickness because the sound energy passes
through the part twice.
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