Marathon Computer AACC 2000 - Manual (Page 89)

Marathon Monitors Inc.
AACC 2000 Carbon Nov. 1, 1997
89
Two-point calibration
The previous section described how to apply a offset, or trim, calibration, which applies a
fixed offset over the full display range of the controller. A two-point calibration is used
to calibrate the controller at two points and applies a straight line between them. Any
readings above, or below, the two calibration points will be an extension of this straight
line. For this reason it is best to calibrate with the two points as far apart as possible.
Proceed as follows:
1. Decide upon the low and high points at which you wish to calibrate.
2. Perform a two point calibration in the manner described below
x 3
Input list header
Press until you reach the input list header, ‘
ip LiSt’.
Press until you reach the ‘
CAL’ display.
Calibration type
• FACt:
Factory Calibration
• USEr:
User Calibration
Use or to select ‘
USEr’.
Selecting ‘
USEr’ enables two-point calibration.
[If two-point calibration is unsatisfactory, select ‘
FACt’ to
return to the factory set calibration.]
Press
Displayed Value
Input
x
x
Factory Calibration
High-point calibration
Low-point calibration
Calibration high-point value
Calibration low-point value
Offset introduced
Offset introduced
User Calibration