% !TeX program = xelatex
documentclass[paper=A3,paper=landscape]{scrartcl}
usepackage{pst-plot}
usepackage[pass]{geometry}
begin{document}
psset{linewidth=0.1pt}
begin{psgraph}(0,0)(10,10){20cm}{20cm}
end{psgraph}
end{document}

% !TeX program = xelatex
documentclass[paper=A3,paper=landscape]{scrartcl}
usepackage{pst-plot}
usepackage[pass]{geometry}
begin{document}
psset{linewidth=0.1pt}
begin{psgraph}(0,0)(10,10){20cm}{20cm}
end{psgraph}
end{document}