Dillon FI-127 - Manual (Page 21)

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The test menu, shown below, gives you access to diagnostic tests.
These are the items listed in the Test menu from left to right:
Display Press ENTER to start and stop a continuous display test. With
the test stopped press the Е Е Е Е Е or MENU key to move backward
or forward one step at a time. Press ENTER again to resume
the automatic test or press ESCAPE to stop the test and
return to diSPLAy.
Buttons This provides a test of the keypad. The name of the key that is
pressed appears on the display. If no key is pressed, nOnE is
displayed. Press MENU to return to buttonS.
A to D Press this key to see the current A to D value. The displayed
resolution is 1 part in 20,000 per mV/V. This test exists so that
the offset and gain of the electronics can be checked. The offset
is initially set to the nominal offset of the electronics, but you can
press the ZERO key to establish the actual offset, allowing the
gain to be evaluated.
Test Menu
Figure 9
Test menu