## 3 Results and Discussion
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & \multicolumn{6}{c}{**Coefficient of Variation, Submission of Results on the Virtual Boom/**Number of Cylinders Out of Range \(\pm\) 15\% of Average Volume Value**} \\ \hline \hline \multicolumn{2}{c}{**Groove Table—CV\({}^{\textbf{b}}\) [\%]**} & \multicolumn{6}{c}{**Point Measurement with a PDA Analyzer—CV(D30)\({}^{\textbf{b}}\) [\%]**} \\ \cline{2-7}  & \multicolumn{6}{c}{**Measurement Time T [s]**} \\ \cline{2-7}  & **120** & **120** & **80** & **60** & **40** & **20** & **10** \\ \hline \multirow{3}{*}{AirMix 11003} & 3.91 & 5.64 & 5.96 & 5.09 & 5.66 & 6.28 & 5.83 \\ \cline{2-7}  & 0 & 0 & 0 & 0 & 0 & 0 \\ \hline \multirow{3}{*}{MMat 11003 EZ} & 9.04 & 10.1 & 10.35 & 11.20 & 10.08 & 11.72 & 13.41 \\ \cline{2-7}  & 0 & 0 & 0 & 0 & 2 & 2 & 2 \\ \hline \multirow{3}{*}{MMat 11003 RS} & 9.53 & 10.47 & 10.12 & 10.48 & 11.1 & 13.57 & 12.24 \\ \cline{2-7}  & 0 & 0 & 0 & 0 & 1 & 2 & 2 \\ \hline \multirow{3}{*}{AirMix 11002} & 8.05 & 10.34 & 9.64 & 10.73 & 11.27 & 12.86 & 11.55 \\ \cline{2-7}  & 0 & 0 & 0 & 0 & 1 & 2 & 2 \\ \hline \multirow{3}{*}{Teejet 11001 VS} & 5.89 & 6.19 & 5.35 & 5.66 & 10.19 & 7.9 & 4.61 \\ \cline{2-7}  & 0 & 0 & 0 & 0 & 1 & 0 & 0 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Results of the CV coefficient of variation as a function of measurement time for the boom section. Figure 13: Graphical interpretation of coefficient of variation for single nozzles: CV(D30)—based on droplet diameter distribution with marked error bars \(\pm\) 5%, CV—based on volume distribution on groove table. The results were evaluated in terms of differences in the coefficient of variation and the number of cylinders outside the tolerance range of \(\pm\)15% of the average volume. The results of calculations according to the method used made it possible to obtain assessments of the coefficient of variation CV(D30)b relative to the test results based on groove table measurements. In the case of tests where a groove table was used to evaluate volume distribution, coefficient of variation values of less than 10% (as required within the acceptable range) were recorded. On the other hand, a slight increase in the coefficients determined by the PDA test was observed over almost the entire range of measurement times (Table 6). Figures 14-17 present the post-composition distribution of volumes determined for (AirMix 11003, MMat 11003 RS) over the full measurement times range T = (120, 80, 60, 40, 20, 10) s.  
Figure 14: Liquid distribution for a boom section composed of AirMix 11003 nozzles with cylinders marking within \(\pm\)15% of the mean volume value depending on the measurement time T = (120, 80, 60) s.  
Figure 15: Liquid distribution for a boom section composed of AirMix 11003 nozzles with cylinders marking within \(\pm\)15% of the mean volume value depending on the measurement time T = (40, 20, 10) s.  
To evaluate the results, a criterion was adopted in which it was assumed that for successive measurements in the time range T = (120, 80, 60, 40, 20, 10) s, the appearance of a volume outside the range of \(\pm\)15% of the mean value in at least one of the cylinders constitutes a limit and excludes this and subsequent measurements from the analysis of the variability of the CV(D30)\({}^{\rm b}\). Between the CV\({}^{\rm b}\) value obtained from the groove table tests and the maximum CV(D30)\({}^{\rm b}\) value for the adopted criterion, there was a gap expressed in percentage points: (i) AirMix 11003--2.4; (ii) MMat 11003 EZ--2.2; (iii) Teejet 11001 VS--0.3; (iv) MMat 11003 RS--0.9; and (v) AirMix 11002--2.7. The nozzle group AirMix 11002, MMat 11003 EZ, Teejet 11001 VS, and MMat 11003 RS is characterized by stability of results and smaller differences in the coefficient of variation, within the range of adopted measurement times T = (120, 80, 60), s. For measurement time T = 40 s, the appearance of results outside the range of \(\pm\)15% of the mean value was noted.