Olympus 45MG, Руководство пользователя

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DMTA-10022-01EN, Rev. C, January 2015
Chapter 9 150
Figure 9-1 Manually adjusting the gain
When activated, the manual gain adjustment also modifies the way in which echoes
are shown on the waveform display (optional). With the default automatic gain, the
measured echo peak is visible on the display, enabling you to readily observe the
measured echo position, independent of its strength or the gain. When you manually
adjust the gain, the displayed echo height changes proportionally to the actual echo
amplitude at the receiver output, enabling you to readily observe gain changes.
To be processed for thickness calculation, the peak amplitude of measured echoes
must be at or above the threshold.
To view, restore, or change the gain value
When the optional waveform is not activated:
1. Press [GAIN/WAVE ADJ] to change the gain from default gain to HIGH (+10 dB).
2. Press [GAIN/WAVE ADJ] again to change the gain to LOW (
−
6 dB).
3. Press [GAIN/WAVE ADJ] a third time to change the gain back to default gain (no
gain showing).
When the optional waveform is activated:
1. Press [GAIN/WAVE ADJ] to view the current automatic gain value.
Echo must be above the 20 %
detection threshold of the waveform
display height in order to be detected.
Manually adjusted gain
value