Olympus Panametrics Epoch 4 Plus, Руководство пользователя

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Managing Special Waveform Functions
Part # 910-250C 41
5 Managing Special Waveform Functions
This chapter describes how to manage special waveform functions.
Topics are as follows:
• Reject
• Peak Memory
• Peak Hold
• Screen Freeze
5.1 Reject
The Reject function eliminates unwanted, low-level signals from the display. Because the
EPOCH 4PLUS features a digital waveform display, the reject function is linear.
Increasing the reject level does not affect the amplitude of the signals above the reject
level. The reject level is continuously adjustable from 0 to 80% of full scale with 1%
resolution and is displayed in the upper left corner of the screen in the split screen view.
Note: It is not possible to add Reject while in the unrectified, RF display.
To access the reject function, follow these steps:
1. Press [2ndF], [VEL] (REJECT).
2. Use the function keys to select preset values or use the [ ], [ ], [ ], and [ ] keys
to adjust the reject level upward or downward. Any signal whose amplitude is less
than or equal to the specified reject level is eliminated from the display.
5.2 Peak Memory
The Peak Memory function enables the display to capture and store on the screen the
amplitude of each display point. The display updates each pixel if a signal of greater
amplitude is acquired. When a transducer is scanned over a reflector, the signal envelope
(echo dynamic as a function of transducer position) is held on the screen. In addition, the
current, live waveform is displayed at the appropriate place within the echo envelope.
This function is useful when it is necessary to peak up an indication during an angle beam
calibration.
Note: The Peak Memory function cannot be activated in the unrectified, RF
display mode.
To activate Peak Memory, follow these steps:
1. Press [PEAK MEM].