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EPOCH 4PLUS
4.4 Using the Pulser Key
The following pulser receiver and filter parameters can be adjusted on the EPOCH 4PLUS
keypad:
• Waveform Rectification
• Pulser Energy
•Pulser Damping
• Pulser Test Mode
• Filter Selection
• Pulser Type (square wave or spike excitation)
• Pulser Frequency (tuned for square wave pulser only)
To access the available parameters, follow these steps:
1. Press [PULSER] multiple times to toggle through the several features.
2. Press [2nd F], [PULSER] (FILTER) to go directly to the filter parameter.
Each pulser-receiver and filter characteristic adjustments can be done in either full A-
Scan or Split Screen.
• In the full A-Scan, the current parameter being adjusted appears at the top left of
the screen and directly above the waveform.
• In the Split Screen mode, the parameter is highlighted on the lower half of the
EPOCH 4PLUS screen.
Note: For reviewing the adjustments in this manual, the Split Screen mode was
used.
To view how the selections of the pulser receiver affect a waveform, couple a transducer
to a sample or test block, which produces an echo on the top half of the screen.
4.4.1 Waveform Rectification
The EPOCH 4PLUS can operate in one of four different rectification modes:
• Full Wave
• Half Wave Positive
• Half Wave Negative
• RF (unrectified)
The RF mode is not active while operating in DAC or TVG mode, or Peak Memory.
To select a waveform rectification mode, follow these steps:
1. Press [PULSER] once to display the current screen rectification. This is highlighted
and displayed at the bottom of the screen.
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