Correcting The S-Curve (Pb); Notes On The S-Correction - Precisa 520 Service- Und Wartungsanleitung
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Verfügbare Sprachen
520
3.4.2
Correcting the S-curve (PB)
0
1.
Ensure that the operating conditions are as described in chapter 3.1.2 and that the balance is in
the service mode as described in chapter 3.2.2.
2.
Press and hold [MODE] until "S-CORRECTION" appears. The balance displays "SET SECTOR-A
+0".
3.
Have the appropriate linearizing reference weights ready according to the specifications: 1× half
load and 1× quarter load.
4.
Tare the balance, place the quarter load and write down the displayed value.
5.
In addition, apply the half load and write down the displayed value (three-quarter load).
6.
Calculate the differences:
Δ
= quarter load
A
Δ
= three quarter load
B
Example:
Δ
= 50.0005g − 50.0000g = 0.0005g
A
Δ
= 149.9997g − 150.0000g = −0.0003g
B
7.
The S-correction values correspond to the differences determined above with reversed sign in
digits [d]:
S
= −Δ
[d]
A
A
S
= −Δ
[d]
B
B
Example:
Δ
= 0.0005g = +5d
A
Δ
= −0.0003g = −3d
B
8.
Enter the determined S-correction values; S
Increase the value by 1d: Press and hold [REF] until "FKT-KEY-3" appears.
Decrease the value by 1d: Press and hold [REF] until "FKT-KEY-4" appears.
Switching between sector A and B: Press and hold [REF] until "FKT-KEY-2" appears.
3.4.3
Notes on the 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, at most 5 digits are the normal case and should not be exceeded.
If the measurements described above nevertheless yield higher correction values, the error
must be sought elsewhere. The most common cause is a damaged or improperly tightened
layer, which means that the weighing cell must be overhauled. Much less frequently, it is due to
the main board or the floating sensor.
Precisa Gravimetrics AG
Δ
A
A
1/4
− quarter load
displayed
− three quarter load
displayed
S
= −Δ
= −5d
⇒
A
A
S
= −Δ
= +3d
⇒
B
B
1/2
placed
placed
for sector A (1/4), S
A
Adjustments
3/4
B
Δ
B
for sector B (3/4):
B
1
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