diff --git a/Makefile b/Makefile
index bf36ff9..a2dd96d 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ OBJECTS = main.o drv/b15f.o drv/plottyfile.o drv/dot.o
 
 COMPILE = $(COMPILER_PATH) $(CFLAGS)
 
-B15F: $(OBJECTS)
+B15F: clean $(OBJECTS)
 	@echo "Linking..."
 	$(COMPILE) $(OBJECTS) -o $(OUTPUT) $(LDFLAGS)
 
diff --git a/drv/b15f.cpp b/drv/b15f.cpp
index 71bfcbf..20333ff 100644
--- a/drv/b15f.cpp
+++ b/drv/b15f.cpp
@@ -282,6 +282,8 @@ bool B15F::analogEingabeSequenz(uint8_t channel_a, uint16_t* buffer_a, uint32_t
 		{
 			buffer_a[offset_a + i] = readInt();
 			buffer_b[offset_b + i] = readInt();
+			if(buffer_a[offset_a + i] > 1023 || buffer_b[offset_b + i] > 1023)
+				std::cout << "schlechte Werte gefunden" << std::endl;
 			//std::cout << "(" << i << ")   " << buffer_a[offset_a + i] << " \t| " << buffer_b[offset_b + i] << std::endl;
 		}
 		
diff --git a/drv/b15f.o b/drv/b15f.o
index 2af3163..ea73b41 100644
Binary files a/drv/b15f.o and b/drv/b15f.o differ
diff --git a/drv/plottyfile.cpp b/drv/plottyfile.cpp
index e55c204..5259633 100644
--- a/drv/plottyfile.cpp
+++ b/drv/plottyfile.cpp
@@ -17,6 +17,8 @@ void PlottyFile::setFunctionType(FunctionType function_type)
 
 void PlottyFile::setQuadrant(uint8_t quadrant)
 {
+	if(quadrant < 1 || quadrant > 4)
+		throw std::range_error("Ungueltiger Quadrant");
 	this->quadrant = quadrant;
 }
 
diff --git a/drv/plottyfile.o b/drv/plottyfile.o
index 33d1562..ef4c3bb 100644
Binary files a/drv/plottyfile.o and b/drv/plottyfile.o differ
diff --git a/gnuplotscript.gp b/gnuplotscript.gp
index d474ebe..9b98559 100644
--- a/gnuplotscript.gp
+++ b/gnuplotscript.gp
@@ -2,13 +2,33 @@ set margin 10,10
 unset key
 set grid
 set title ''
-set xlabel 'Zeit [t]'
-set ylabel 'Spannung [V]'
-set xrange [0:1023]
-set yrange [0:1023]
-set label at 1022,1022 '1' left
-set label at 1022,511 '2' left
+set xlabel 'U_{GS} [V]'
+set ylabel 'I_D [mA]'
+set xrange [5:0]
+set x2range [5:0]
+set y2range [0:50]
+set yrange [0:50]
+set label at 2,33 'U_{DS} [V] = 300' right
+set label at 2,30 'U_{DS} [V] = 325' right
+set label at 2,33 'U_{DS} [V] = 350' right
+set label at 2,35 'U_{DS} [V] = 375' right
+set label at 2,21 'U_{DS} [V] = 400' right
+set label at 2,21 'U_{DS} [V] = 425' right
+set label at 2,22 'U_{DS} [V] = 450' right
+set label at 2,22 'U_{DS} [V] = 475' right
+set label at 2,22 'U_{DS} [V] = 500' right
+set label at 2,5 'U_{DS} [V] = 525' right
+set label at 2,11 'U_{DS} [V] = 550' right
+set label at 2,11 'U_{DS} [V] = 575' right
+set label at 2,11 'U_{DS} [V] = 600' right
+set label at 2,11 'U_{DS} [V] = 625' right
+set label at 2,4 'U_{DS} [V] = 650' right
+set label at 2,4 'U_{DS} [V] = 650' right
+set label at 2,4 'U_{DS} [V] = 700' right
+set y2tics
+unset ytics
+set ytics format ''
 unset output 
 set terminal qt
 unset output
-plot "/tmp/tempfile0" using ($1*1.000000):($2*1.000000) binary format="%int16%int16" endian=big title ' [] = 1' w l,"/tmp/tempfile1" using ($1*1.000000):($2*1.000000) binary format="%int16%int16" endian=big title ' [] = 2' w l
+plot "/tmp/tempfile1" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 300' w l,"/tmp/tempfile2" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 325' w l,"/tmp/tempfile3" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 350' w l,"/tmp/tempfile4" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 375' w l,"/tmp/tempfile5" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 400' w l,"/tmp/tempfile6" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 425' w l,"/tmp/tempfile7" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 450' w l,"/tmp/tempfile8" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 475' w l,"/tmp/tempfile9" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 500' w l,"/tmp/tempfile10" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 525' w l,"/tmp/tempfile11" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 550' w l,"/tmp/tempfile12" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 575' w l,"/tmp/tempfile13" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 600' w l,"/tmp/tempfile14" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 625' w l,"/tmp/tempfile15" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 650' w l,"/tmp/tempfile16" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 675' w l,"/tmp/tempfile17" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 700' w l
diff --git a/main b/main
index 06d2088..17a4de3 100755
Binary files a/main and b/main differ
diff --git a/main.cpp b/main.cpp
index 4942aca..74471d6 100644
--- a/main.cpp
+++ b/main.cpp
@@ -2,44 +2,116 @@
 #include "drv/b15f.h"
 #include "drv/plottyfile.h"
 
+PlottyFile pf;
+
+void kennlinieErsterQuadrant()
+{
+	B15F& drv = B15F::getInstance();
+	
+	uint16_t ba[1024];
+	uint16_t bb[1024];
+	
+	const uint16_t sample_count = 100;
+	const uint16_t delta = 10;
+	
+	const uint16_t u_gs_start = 440;
+	const uint16_t u_gs_delta = 20;
+	const uint16_t u_gs_end = 600;
+	
+	pf.setUnitX("V");
+	pf.setUnitY("mA");
+	pf.setUnitPara("V");
+	pf.setDescX("U_{DS}");
+	pf.setDescY("I_D");
+	pf.setDescPara("U_{GS}");
+	pf.setRefX(5);
+	pf.setRefY(50);
+	pf.setParaFirstCurve(u_gs_start);
+	pf.setParaStepWidth(u_gs_delta);
+	
+	uint8_t curve = 0;
+	for(uint16_t u_gs = u_gs_start; u_gs <= u_gs_end; u_gs += u_gs_delta)
+	{
+		drv.analogeAusgabe1(u_gs);
+		
+		drv.analogEingabeSequenz(0, &ba[0], 0, 1, &bb[0], 0, 0, delta, sample_count);
+		drv.delay(10);
+		drv.discard();
+		drv.delay(10);
+		
+		for(uint16_t k = 0; k < sample_count+1; k++)
+		{
+			uint16_t i_d = ba[k] - bb[k];
+			uint16_t u_ds = bb[k];
+			pf.addDot(Dot(u_ds, i_d, curve));
+		}
+		
+		curve++;
+	}
+}
+
+void kennlinieZweiterQuadrant()
+{
+	B15F& drv = B15F::getInstance();
+	
+	uint16_t ba[1024];
+	uint16_t bb[1024];
+	
+	const uint16_t sample_count = 1000;
+	const uint16_t delta = 1;
+	
+	const uint16_t u_gs_start = 300;
+	const uint16_t u_gs_delta = 25;
+	const uint16_t u_gs_end = 700;
+	
+	pf.setQuadrant(2);
+	pf.setUnitX("V");
+	pf.setUnitY("mA");
+	pf.setUnitPara("V");
+	pf.setDescX("U_{GS}");
+	pf.setDescY("I_D");
+	pf.setDescPara("U_{DS}");
+	pf.setRefX(5);
+	pf.setRefY(50);
+	pf.setParaFirstCurve(u_gs_start);
+	pf.setParaStepWidth(u_gs_delta);
+	
+	uint8_t curve = 0;
+	for(uint16_t u_gs = u_gs_start; u_gs <= u_gs_end; u_gs += u_gs_delta)
+	{
+		drv.analogeAusgabe1(u_gs);
+		
+		drv.analogEingabeSequenz(0, &ba[0], 0, 1, &bb[0], 0, 0, delta, sample_count);
+		drv.delay(10);
+		drv.discard();
+		drv.delay(10);
+		
+		curve = 0;
+		for(uint16_t k = 0; k < sample_count + 1; k++)
+		{
+			if(ba[k] > bb[k] && bb[k] % 50 == 0 && bb[k] > 0)
+			{
+				uint16_t i_d = ba[k] - bb[k];
+				pf.addDot(Dot(u_gs, i_d, bb[k] / 50));
+			}
+			curve++;
+		}
+		std::cout << "u_gs: " << u_gs << std::endl;
+	}
+}
+
 int main()
 {
 	B15F& drv = B15F::getInstance();
 	drv.init();
 	
-	/*
-	while(1)
-	{
-		for(uint16_t i = 0; i < 1024; i++)
-		{
-			drv.analogeAusgabe0(drv.analogeEingabe(5));
-			//drv.delay(10);
-			//drv.digitaleAusgabe0(drv.digitaleEingabe0());
-		}
-	}*/
-	
-	uint16_t ba[1024];
-	uint16_t bb[1024];
-	drv.analogEingabeSequenz(1, &ba[0], 0, 0, &bb[0], 0, 1023, -1, 1023);
-	
-	PlottyFile pf;
-	pf.setUnitX("t");
-	pf.setUnitY("V");
-	pf.setDescX("Zeit");
-	pf.setDescY("Spannung");
-		
-	for(uint16_t i = 0; i < 1023; i++)
-	{
-		pf.addDot(Dot(i,i, 0));
-		pf.addDot(Dot(i,i/2, 1));
-	}
-	pf.writeToFile("test_plot");
+	kennlinieZweiterQuadrant();
 	
+	// speichern und plotty starten
+	pf.writeToFile("test_plot");	
 	int code = system("./plotty --in test_plot");
 	if(code)
-	{
-		std::cout << "plotty konnte nicht gestarted werden" << std::endl;
-	}
+		std::cout << "Fehler beim  plotty Aufruf" << std::endl;
 	
 	std::cout << "Schluss." << std::endl;
 }
diff --git a/main.o b/main.o
index 7849783..7ba2d8f 100644
Binary files a/main.o and b/main.o differ
diff --git a/test_plot b/test_plot
index 6561707..abc733e 100644
Binary files a/test_plot and b/test_plot differ