Calculating the weight

Each measurement of the analog inputs is followed by the calculation of the resulting weight or the resulting force, which is made up of the ratio of the measuring signal to the reference signal and of several calibrations.

YR = (UDiff / URef) ⋅ Ai

(1.0)

Calculation of the raw value in mV/V

YL = ( (YR - CZB) / (Cn - CZB) ) ⋅ Emax

(1.1)

Calculation of the weight

YS =  YL ⋅ AS

(1.2)

Scaling factor (e.g. factor 1000 for rescaling from kg to g)

YG =  YS ⋅ (G / 9.80665)

(1.3)

Influence of acceleration of gravity

YAUS =  YG ⋅ Gain - Tare

(1.4)

Gain and Tare

Name

Description

CoE Index

UDiff

Bridge voltage/differential voltage of the sensor element, after averager and filter

 

URef

Bridge supply voltage/reference signal of the sensor element, after averager and filter

 

Ai

Internal gain, not changeable. This factor accounts for the unit standardization from mV to V and the different full-scale deflections of the input channels

 

Cn

Nominal characteristic value of the sensor element (unit mV/V, e.g. nominally 2 mV/V or 2.0234 mV/V according to calibration protocol)

0x8000:23

CZB

Zero balance of the sensor element (unit mV/V, e.g. -0.0142 according to calibration protocol)

0x8000:25

Emax

Nominal load of the sensor element
The firmware always calculates without units, the unit (kg, g, lb) used here is then also applicable to the result

0x8000:24

AS

Scaling factor (e.g. factor 1000 for rescaling from kg to g)

0x8000:27

G

Acceleration of gravity in m/s2 (default:  9.80665 ms/s2)

0x8000:26

Gain

 

0x8000:21

Tare

 

0x8000:22