diff --git a/DSView/pv/mainwindow.cpp b/DSView/pv/mainwindow.cpp
index 63e12660..5a8b7aa2 100644
--- a/DSView/pv/mainwindow.cpp
+++ b/DSView/pv/mainwindow.cpp
@@ -1458,7 +1458,7 @@ namespace pv
 
     void MainWindow::on_signals_changed()
     {
-        _view->signals_changed();
+        _view->signals_changed(NULL);
     }
 
     void MainWindow::receive_trigger(quint64 trigger_pos)
diff --git a/DSView/pv/sigsession.cpp b/DSView/pv/sigsession.cpp
index 42a7395d..bf6b800f 100644
--- a/DSView/pv/sigsession.cpp
+++ b/DSView/pv/sigsession.cpp
@@ -112,7 +112,6 @@ namespace pv
 
         _lissajous_trace = NULL;
         _math_trace = NULL;
-        _stop_scale = 1;
         _is_decoding = false;
         _bClose = false;
         _callback = NULL;
@@ -441,7 +440,6 @@ namespace pv
 
         set_cur_snap_samplerate(_device_agent.get_sample_rate());
         set_cur_samplelimits(_device_agent.get_sample_limit());
-        set_stop_scale(1);
 
         _data_updated = false;
         _trigger_flag = false;
@@ -472,12 +470,13 @@ namespace pv
         for (auto s : _signals)
         {  
             if (s->signal_type() == SR_CHANNEL_DSO){   
-                view::DsoSignal *dsoSig = (view::DsoSignal*)s;
-                dsoSig->set_zero_ratio(dsoSig->get_zero_ratio());
+                auto sig = (view::DsoSignal*)s;
+                sig->set_zero_ratio(sig->get_zero_ratio());
+                sig->set_stop_scale(1);
             }            
             else if (s->signal_type() == SR_CHANNEL_ANALOG){  
-                view::AnalogSignal *analogSig = (view::AnalogSignal*)s;
-                analogSig->set_zero_ratio(analogSig->get_zero_ratio());
+                auto sig = (view::AnalogSignal*)s;
+                sig->set_zero_ratio(sig->get_zero_ratio());
             }
         }
 
diff --git a/DSView/pv/sigsession.h b/DSView/pv/sigsession.h
index a8d722b9..f41c14e6 100644
--- a/DSView/pv/sigsession.h
+++ b/DSView/pv/sigsession.h
@@ -305,14 +305,6 @@ public:
         return _save_end;
     }
 
-    inline void set_stop_scale(float scale){
-        _stop_scale = scale;
-    }
-
-    inline float stop_scale(){
-        return _stop_scale;
-    }
-
     void clear_all_decoder(bool bUpdateView = true); 
 
     inline bool is_closed(){
@@ -571,7 +563,6 @@ private:
     SESSION_ERROR_STATUS _error;
     uint64_t    _error_pattern;
     int         _map_zoom;  
-    float       _stop_scale;
     bool        _bClose;  
  
     uint64_t    _save_start;
diff --git a/DSView/pv/view/decodetrace.cpp b/DSView/pv/view/decodetrace.cpp
index 1b1e47cb..4db2cff0 100644
--- a/DSView/pv/view/decodetrace.cpp
+++ b/DSView/pv/view/decodetrace.cpp
@@ -541,7 +541,7 @@ void DecodeTrace::on_new_decode_data()
     if (_view && _view->session().is_stopped_status())
         _view->data_updated();
     if (_totalHeight/_view->get_signalHeight() != rows_size())
-        _view->signals_changed();
+        _view->signals_changed(NULL);
 }
 
 int DecodeTrace::get_progress()
diff --git a/DSView/pv/view/dsosignal.cpp b/DSView/pv/view/dsosignal.cpp
index a6bec396..b67004ef 100644
--- a/DSView/pv/view/dsosignal.cpp
+++ b/DSView/pv/view/dsosignal.cpp
@@ -117,7 +117,7 @@ DsoSignal::~DsoSignal()
 
 void DsoSignal::set_scale(int height)
 {
-    _scale = height / (_ref_max - _ref_min) * session->stop_scale();
+    _scale = height / (_ref_max - _ref_min) * _stop_scale;
 }
 
 void DsoSignal::set_enable(bool enable)
@@ -191,7 +191,7 @@ bool DsoSignal::go_vDialPre(bool manul)
                               _vDial->get_value(), _probe, NULL);
 
         if (session->is_stopped_status()) {
-            session->set_stop_scale(session->stop_scale() * (pre_vdiv/_vDial->get_value()));
+            set_stop_scale(_stop_scale * (pre_vdiv/_vDial->get_value()));
             set_scale(get_view_rect().height());
         }
         session->get_device()->set_config_uint16(SR_CONF_PROBE_OFFSET,
@@ -226,7 +226,7 @@ bool DsoSignal::go_vDialNext(bool manul)
                               _vDial->get_value(), _probe, NULL);
 
         if (session->is_stopped_status()) {
-            session->set_stop_scale(session->stop_scale() * (pre_vdiv/_vDial->get_value()));
+            set_stop_scale(_stop_scale * (pre_vdiv/_vDial->get_value()));
             set_scale(get_view_rect().height());
         }
         session->get_device()->set_config_uint16(SR_CONF_PROBE_OFFSET,
@@ -985,7 +985,7 @@ void DsoSignal::paint_trace(QPainter &p,
         uint8_t value; 
         float x = (start / samples_per_pixel - pixels_offset) + left + _view->trig_hoff()*pixels_per_sample;
         float y;
-       
+ 
         for (int64_t sample = 0; sample < sample_count; sample++) {
             value = samples_buffer[sample];
             y = min(max(top, zeroY + (value - hw_offset) * _scale), bottom);
diff --git a/DSView/pv/view/dsosignal.h b/DSView/pv/view/dsosignal.h
index 9d516dfa..660c9bb7 100644
--- a/DSView/pv/view/dsosignal.h
+++ b/DSView/pv/view/dsosignal.h
@@ -239,6 +239,9 @@ public:
 
     bool mouse_wheel(int right, const QPoint pt, const int shift);
 
+    inline void set_stop_scale(float v){
+        _stop_scale = v;
+    }
 
 protected:
     void paint_type_options(QPainter &p, int right, const QPoint pt, QColor fore);
@@ -264,6 +267,7 @@ private:
 private:
     pv::data::DsoSnapshot *_data;
 	float _scale;
+    float _stop_scale = 1;
     bool _en_lock;
     bool _show;
 
diff --git a/DSView/pv/view/header.cpp b/DSView/pv/view/header.cpp
index 6c94ed32..f9455198 100644
--- a/DSView/pv/view/header.cpp
+++ b/DSView/pv/view/header.cpp
@@ -275,7 +275,7 @@ void Header::mouseReleaseEvent(QMouseEvent *event)
 
     if (_moveFlag) {
         _drag_traces.clear();
-        _view.signals_changed();
+        _view.signals_changed(mTrace);
         _view.set_all_update(true);
 
         std::vector<Trace*> traces;
diff --git a/DSView/pv/view/view.cpp b/DSView/pv/view/view.cpp
index dfadaa89..edd32019 100644
--- a/DSView/pv/view/view.cpp
+++ b/DSView/pv/view/view.cpp
@@ -616,7 +616,7 @@ void View::mode_changed()
     _scale = max(min(_scale, _maxscale), _minscale);
 }
 
-void View::signals_changed()
+void View::signals_changed(const Trace* eventTrace)
 {
     double actualMargin = SignalMargin;
     int total_rows = 0;
@@ -628,6 +628,8 @@ void View::signals_changed()
     std::vector<Trace*> logic_traces;
     std::vector<Trace*> decoder_traces;
 
+    (void)eventTrace;
+
     get_traces(ALL_VIEW, traces);
 
     for(auto t : traces) {
@@ -761,14 +763,15 @@ void View::signals_changed()
             t->set_v_offset(next_v_offset + 0.5 * traceHeight + actualMargin);
             next_v_offset += traceHeight + 2 * actualMargin;
 
-            view::DsoSignal *dsoSig = NULL;
-            if ((dsoSig = dynamic_cast<view::DsoSignal*>(t))) {
-                dsoSig->set_scale(dsoSig->get_view_rect().height());
+            if (t->signal_type() == SR_CHANNEL_DSO)
+            {
+                auto sig = dynamic_cast<view::DsoSignal*>(t);
+                sig->set_scale(sig->get_view_rect().height());              
             }
-
-            view::AnalogSignal *analogSig = NULL;
-            if ((analogSig = dynamic_cast<view::AnalogSignal*>(t))) {
-                analogSig->set_scale(analogSig->get_totalHeight());
+            else if (t->signal_type() == SR_CHANNEL_ANALOG)
+            {
+                auto sig = dynamic_cast<view::AnalogSignal*>(t);
+                sig->set_scale(sig->get_view_rect().height());
             }
         }
         _time_viewport->clear_measure();
@@ -852,7 +855,7 @@ void View::resizeEvent(QResizeEvent*)
     setViewportMargins(headerWidth(), RulerHeight, 0, 0);
     update_margins();
     update_scroll();
-    signals_changed();
+    signals_changed(NULL);
 
     if (_device_agent->get_work_mode() == DSO)
         _scale = _session->cur_view_time() / get_view_width();
@@ -1143,7 +1146,7 @@ void View::vDial_updated()
 void View::show_lissajous(bool show)
 {
     _show_lissajous = show;
-    signals_changed();
+    signals_changed(NULL);
 }
 
 void View::show_region(uint64_t start, uint64_t end, bool keep)
@@ -1175,7 +1178,7 @@ void View::splitterMoved(int pos, int index)
 {
     (void)pos;
     (void)index;
-    signals_changed();
+    signals_changed(NULL);
 }
 
 void View::reload()
diff --git a/DSView/pv/view/view.h b/DSView/pv/view/view.h
index d4065bd6..dcf3b0be 100644
--- a/DSView/pv/view/view.h
+++ b/DSView/pv/view/view.h
@@ -313,7 +313,7 @@ public:
     void update_view_port();
 
     inline void update_all_trace_postion(){
-        signals_changed();
+        signals_changed(NULL);
     }
 
     inline Viewport* get_time_view(){
@@ -353,11 +353,13 @@ public:
     static bool compare_trace_view_index(const Trace *a, const Trace *b);
 
     static bool compare_trace_y(const Trace *a, const Trace *b);
+
+    void signals_changed(const Trace* eventTrace);
  
 public slots:
     void reload();
     void set_measure_en(int enable);
-    void signals_changed();
+  
     void data_updated();
     void update_scale_offset();
     void show_region(uint64_t start, uint64_t end, bool keep);