diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -124,7 +124,7 @@ MainWindow::MainWindow(QWidget *parent) 
             this, &MainWindow::onNumOfSamplesChanged);
 
     connect(&plotControlPanel, &PlotControlPanel::scaleChanged,
-            ui->plot, &Plot::setAxis);
+            plotMan, &PlotManager::setAxis);
 
     connect(&plotControlPanel, &PlotControlPanel::multiPlotChanged,
             plotMan, &PlotManager::setMulti);
@@ -170,10 +170,9 @@ MainWindow::MainWindow(QWidget *parent) 
         plotMan->addCurve(channelMan.channelName(i), channelMan.channelBuffer(i));
     }
 
-    // TODO: plotman
     // init auto scale
-    ui->plot->setAxis(plotControlPanel.autoScale(),
-                      plotControlPanel.yMin(), plotControlPanel.yMax());
+    plotMan->setAxis(plotControlPanel.autoScale(),
+                     plotControlPanel.yMin(), plotControlPanel.yMax());
 
     // Init sps (sample per second) counter
     spsLabel.setText("0sps");
diff --git a/src/plotmanager.cpp b/src/plotmanager.cpp
--- a/src/plotmanager.cpp
+++ b/src/plotmanager.cpp
@@ -33,9 +33,13 @@ PlotManager::PlotManager(QWidget* plotAr
     darkBackgroundAction("Dark Background", this),
     showLegendAction("Legend", this)
 {
+    _autoScaled = true;
+    _yMin = 0;
+    _yMax = 1;
+    isDemoShown = false;
+
     // initalize layout and single widget
     isMulti = false;
-    isDemoShown = false;
     scrollArea = NULL;
     setupLayout(isMulti);
     addPlotWidget();
@@ -176,6 +180,7 @@ Plot* PlotManager::addPlotWidget()
     plot->showMinorGrid(showMinorGridAction.isChecked());
     plot->showLegend(showLegendAction.isChecked());
     plot->showDemoIndicator(isDemoShown);
+    plot->setAxis(_autoScaled, _yMin, _yMax);
 
     return plot;
 }
@@ -312,3 +317,14 @@ void PlotManager::darkBackground(bool en
         plot->darkBackground(enabled);
     }
 }
+
+void PlotManager::setAxis(bool autoScaled, double yAxisMin, double yAxisMax)
+{
+    _autoScaled = autoScaled;
+    _yMin = yAxisMin;
+    _yMax = yAxisMax;
+    for (auto plot : plotWidgets)
+    {
+        plot->setAxis(autoScaled, yAxisMin, yAxisMax);
+    }
+}
diff --git a/src/plotmanager.h b/src/plotmanager.h
--- a/src/plotmanager.h
+++ b/src/plotmanager.h
@@ -61,6 +61,8 @@ public slots:
     void replot();
     /// Enable display of a "DEMO" label on each plot
     void showDemoIndicator(bool show = true);
+    /// Set the Y axis
+    void setAxis(bool autoScaled, double yMin = 0, double yMax = 1);
 
 private:
     bool isMulti;
@@ -70,6 +72,9 @@ private:
     QList<QwtPlotCurve*> curves;
     QList<Plot*> plotWidgets;
     bool isDemoShown;
+    bool _autoScaled;
+    double _yMin;
+    double _yMax;
 
     // menu actions
     QAction showGridAction;