Grid Modes - Olympus EPOCH 650 User Manual

To activate the freeze function automatically
1. Enable at least one gate alarm function (see "Gate Alarms" on page 133)
2. In the gate menu, set AFREEZE = On
To deactivate the freeze function
 Press FREEZE to deactivate a manual or automatic freeze.
The freeze function is useful when storing waveforms because it holds the current A-
scan. This allows the transducer to be removed from the test piece. Once the display is
frozen, you can use a variety of instrument functions. These include:
• Gate movement
To position the gate(s) over area(s) of interest to obtain measurement data.
• Gain
To amplify signals of interest or to reduce the amplitude of signals when high-
scanning gain values are being used.
• Range and delay
To manipulate the time base to focus on the area of interest. The total instrument
range cannot be increased, but can be decreased to "zoom in" on a certain area of
the frozen waveform.
• Rectification
To adjust the rectification view of the frozen waveform
• Data logging
• Printing
When the freeze function is active, the following parameters cannot be
changed/accessed:
• Zero offset
• Range (cannot be increased)
• Pulser/Receiver settings such as PRF, Energy, Mode, pulser waveform, and Filter
6.5

Grid Modes

The EPOCH 650 ultrasonic flaw detector provides multiple grid modes for easy A-
scan interpretation, depending on the application.
DMTA-10055-01EN, Rev. A, February 2015
Managing Special Waveform Functions 119