Precisa 360 - Adjusting the S-Correction; Measuring the S-Curve; Calculating the S-Correction Factors

360 Adjustments
60
3.13 Adjusting the S-correction
Important: The S-correction only has to be adjusted in case the linearity at half and full load stays within and at
quarter and three quarter load stays out of the tolerated range!
Once the linearity is adjusted the balance response behaviour may follow an S-curve, i.e. the
linearity at quarter and three quarter load may stay out of the tolerated range and has to be
adjusted:
3.13.1 Measuring the S-curve
1. Ensure the balance has reached its operating temperature and is in weighing mode (turn it off
and on by pressing ON/OFF twice).
2. Have, according to the specifications, suitable linearisation reference weights at disposal: 1x half
load, 1x quarter load.
3. Tare the balance, place the quarter load and note the displayed value.
4. Place the three quarter load and note the displayed value.
5. Calculate the differences:
∆a = (displayed quarter load) - (placed quarter load)
∆b = (displayed three quarter load) - (placed three quarter load)
Example:
∆a = 50.0004g - 50.0000g = 0.0004g
∆b = 149.9998g - 150.0000g = -0.0002g
3.13.2 Calculating the S-correction factors
1. Indicate the differences in digits and change their signs:
Sa = -∆a [d]
Sb = -∆b [d]
Example:
∆a = 0.0004g = +4 d ⇒ Sa = -∆a = -4 d
∆b = -0.0002g = -2 d ⇒ Sb = -∆b = +2 d
a (1/4 load)
b (3/4 load)
∆b
∆a