910-269-EN, Rev. B, June 2011
92 Chapter 4
4.4 Pulser Adjustments
The pulser settings in the EPOCH 1000 Series conventional ultrasound mode are
available from the 1/5
> Pulser submenu. The pulser setup parameters are:
• Pulse Repetition Frequency (PRF)
• Pulse Energy (Voltage)
• Damping
• Test Mode
• Pulser Waveform
• Pulser Frequency Selection (Pulse Width)
4.4.1 Pulse Repetition Frequency (PRF)
Pulse repetition frequency (PRF) is a measure of how often the transducer is being
pulsed by the electronic circuitry in the EPOCH
1000 Series.
PRF is typically adjusted based on the test method or test piece geometry. For parts
with long sound paths, it is necessary to lower the PRF to avoid wrap-around
interference that results in spurious signals on the display. For applications with rapid
scanning, it is often necessary to use a high PRF rate to assure that small defects are
detected as the probe moves past the part.
The EPOCH 1000 Series allows you to manually adjust the PRF from 5 Hz to 6000 Hz
in 50
Hz (coarse) or 5 Hz (fine) increments. The instrument also has two Auto-PRF
settings to automatically adjust the PRF based on screen range.
To select a PRF adjustment method
Choose 1/5 > Pulser > PRF Mode, and then vary the setting. The available choices
are:
Auto Low
Used to adjust the PRF to the lowest standard value based on screen range
and test mode (default setting).
Auto High
Used to adjust the PRF to the highest possible value based on screen range
and test mode.
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