DayTronic 3000PLUS - Page 71

3KP64 - 4.12
3000PLUS WITH 5D64 INSTRUCTION MANUAL V. SB.2
Daytronic Corporation
2211 Arbor Blvd. Dayton, OH 45439 • (800) 668-4745
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output reading to see if further adjustment is necessary
(if so, you may use the corresponding
UP / DOWN
ARROW
buttons). Fig. 15 illustrates a typical nonlineari-
ty in need of both positive and negative midscale cor-
rection.
NOTE: A
positive LNP value moves the positive-domain
midpoint
upwards (yielding a larger positive reading at
that point), while a negative LNP value moves it down-
wards
(yielding a smaller positive reading). Similarly, a
positive LNN value moves the negative-domain mid-
point
upwards (yielding a smaller negative reading at
that point), while a
negative LNN value moves it down-
wards
(yielding a larger negative reading).
4. SOFTWARE CONFIGURATION
AND CALIBRATION
Ideal
"Linear"
Output
NOTE: For purposes of illustration, the
magnititude of nonlinear deviation (∆y)
has been exaggerated in this figure.
Full-Scale
(Positive)
Midpoint
(50% of full scale,
Positive)
Uncorrected
"Nonlinear"
Output
y
d
∆y
Actual (Uncorrected)
Midscale Output
Uncorrected
Midscale Error
y
d
=
∆y
=
Fig. 15
Linearity Correction
in the Positive Domain
To correct for positive-directed non-
linearity in the positive domain, enter
a
POSITIVE LINEARITY (LNP)
command of
LNP = –(∆y/y
d
*
100)
A negative LNP value is entered
because the midpoint of the actual
output curve needs to be pushed
downward (in the negative direction).
A comparable
positive NEGATIVE
LINEARITY (LNN)
value would be
entered to move the output curve
upward (in the positive direction) in
the negative domain.