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all of the measurements the gauge makes will be erroneous by some fixed
percentage.
The One Point calibration is the simplest and most commonly used calibration
method - optimizing linearity over large ranges. The Two Point calibration allows for
greater accuracy over small ranges by calculating the probe zero and velocity. The
MMX-7 provides four simple methods for setting the sound-velocity outlined below:
1) Press the MENU key once to activate the menu items tab. Press the MENU
key multiple times to tab right, and the ESC key multiple times to tab left,
until the CAL menu is highlighted and displaying the submenu items.
2) Use the UP and DOWN arrow keys to scroll through the sub menu items
until VELOCITY is highlighted.
3) 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 velocity number is correctly displayed.
7)
Press the OK key to set the velocity and return to the menu screen, or ESC
to cancel entering the velocity.
Calibration to a known velocity
34
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