General
126
MC4 User Guide
As Found Calibration
The As Found calibration documents the state of the instrument be-
fore carrying out any adjustments. The calibration specifies the
amount of drift in the instrument during the calibration period.
Below is an example of an error graph. It is used for evaluating the
instrument.
0
0
2 5
5 0
7 5
1 0 0 %
E r r o r
More of error calculation in chapter
Error Calculation Formulas
on
page 181.
Adjustment
If the found error is outside acceptable limits (reject limits), the in-
strument needs adjustment. Activate one of MC4's error display
modes to help you minimize the error (see chapter
Tools Menu
in
part B).
Use the instrument's ZERO adjustment at lower end of the range.
Adjust the higher end of the range with the instrument's SPAN ad-
justment. The two adjustment points do not necessarily need to be
the end points of the instrument range. You may want to use other
points to optimize the calibration at the most important part of the
range. Note, however, that if the points are very close to each other,
the error at other points of the range may be quite big (see
As Left
Calibration
on next page).
Z E R O
S P A N
0
0
2 5
5 0
7 5
1 0 0 %
E r r o r
Содержание MC4
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