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After this has already been done for the coarse range, any remaining deviations can also be
corrected in the fine range.
Δ
A1
0
A1
1/8
1.
Ensure the balance has reached its operating temperature, is levelled and set to the service
mode according to chapter 2.3.
2.
Wipe left > (MSP) > Context menu > {S-correction}.
3.
Have, according to the specifications, suitable linearisation reference weights at disposal: 1×
quarter load and 1× eighth load.
4.
Tare the balance, place the eighth load and note the displayed value.
5.
Addittionally place the quarter load and note the displayed value (three eighth load).
6.
Calculate the differences:
Δ
= eighth load
A1
Δ
= three eighth load
B1
Example:
Δ
= 25.00002g − 25.00000g = 0.00002g
A1
Δ
= 74.99999g − 75.00000g = −0.00001g
B1
7.
The S-correction values correspond to the differences determined above with reversed sign in
digits [d]:
S
= −Δ
[d]
A1
A1
S
= −Δ
[d]
B1
B1
Example:
Δ
= 0.00002g = +2d
A1
Δ
= −0.00001g = −1d
B1
8.
Enter the determined S-correction values; S
2.5.3
Notes on S-correction
•
A correction of the S-curve is actually a refined adjustment of the linearity at additional points.
Correction values of up to 4, maximum 5 digits are the normal case and should not be
exceeded. If the measurements described above nevertheless result in higher correction values,
the error must be sought elsewhere. The most common cause is a damaged or incorrectly
tightened flexure, which means that the weighing cell must be overhauled. Much less frequently
it is due to the main board or the floating sensor.
•
S-correction of the fine range requires very accurate or calibrated weights, which can quickly
become tricky. In addition, experience has shown that the deviations are within the repeatability
limits. To avoid this, it is recommended that the weighing cell be carefully overhauled and the
linearity adjusted in the same way.
Precisa Gravimetrics AG
1/4
B1
3/8
Δ
1/4
B1
− eighth load
displayed
placed
− three eighth load
displayed
S
= −Δ
= −2d
⇒
A1
A1
S
= −Δ
⇒
B1
B1
1/2
1/2
placed
= +1d
for sector A1 (1/8), S
A1
Adjustments
3/4
for sector B1 (3/8).
B1
1
1
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