MoTeC AFM1 - Manual (Page 12)

8 Meter Operation
A. Adjustment During Range Selection
The Analog Output may be adjusted while in the Range Select Mode
(i.e. While The Display is Showing AO 1 to AO 9).
During Range Selection the Analog Output voltage will be set to a
predetermined level which is dependant on the selected range.
Appendix E shows the voltage level and corresponding Lambda value
for the various output modes.
The + and - buttons may be used to adjust the output voltage to give
the correct reading on the measurement device.
B. Adjustment During Normal Operation
The + and - buttons may be used to adjust the output voltage to give
the correct reading on the measurement device.
Adjust so that the reading on the measuring device corresponds exactly
to the reading on the Meter display.
Note The adjustment should be checked at two or more points
covering the extremes of the normal operating range.