Dakota Ultrasonics MMX-7 - Manual (Page 55)

MMX-7 Data Logging Ultrasonic Thickness Gauge
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How do I know when to increase the gain? Often times the user will be trying to
measure a material that is hard to penetrate or pass sound through. This may be
due to the material type, or overall thickness of the material. When a material is hard
to pass sound through because of the thickness or general make-up, it would be a
good time to consider switching the MMX-7 into a high gain setting. In any case, the
selectable gain settings offer the user some additional options to resolve application
issues.
Note: When the echo-echo thru-paint measurement mode is selected, the gain
manual gain feature is disabled and grayed out in the menu items. In this mode, the
MMX-7 switches to an automatic gain mode (AGC), that optimizes the gain setting
automatically in the hardware of the MMX-7.
The procedures to adjust the Gain are outlined below:
Adjusting the Gain using the Hot Menus
1) Press the MEAS key once to activate measure menu items. Press the
MEAS key multiple times to move right, and the ESC key multiple times to
move left until the GAIN cell is highlighted.
2) Press the UP, DOWN, LEFT, and RIGHT arrow keys to scroll the highlighted
value.
3) Alternatively, press the ENTER key to display the Digits Edit Box.
4) Press the UP and DOWN arrow keys to scroll the highlighted value.
5) Press the LEFT and RIGHT arrow keys to scroll the digit locations.
6) Repeat steps 4 & 5 until the GAIN value is correctly displayed.
7) Press the OK key to return to the measurement screen, or ESC to cancel
entering the GAIN.