Contents
1 Load Cell Fundamentals.3
2 Weight Measurements Using a Load Cell and the MSC1210 .4
3 Theory ...5
3.1 Decimation Ratio ..5
3.2 PGA and Buffer ....6
3.3 Offset and Gain Calibration of Load Cell..6
3.4 Calculating the Display Resolution (Count)...7
3.5 Reference Voltage8
3.6 Filtering, Display Rate, and Settling Time 9
3.7 Dynamically Controlled Window Sizes 9
3.8 Temperature Drift Compensation .10
4 Results 11
4.1 No Averaging12
4.2 Running Average14
5 Summary..16
Example Code .16
References..22
Figures
Figure 1. Schematic of TH1042 High Precision Load Cell...3
Figure 2. Load Cell Setup ..5
Figure 3. Output Voltage vs. Load ...7
Figure 4. Example of State Machine for Dynamically Controlling Window Sizes .10
Figure 5. 200 Consecutive Readings ..12
Figure 6. Histogram for Data in Figure 5..13
Figure 7. 200 Consecutive Readings, Window Size = 8 ....14
Figure 8. Histogram for Data in Figure 7..15
Tables
Table 1. Bin Number and Interval 13
Table 2. Bin Number and Interval 15
Table 3. Summary of Results.. 15