diff --git a/RFG_ADC_dataplotter.py b/RFG_ADC_dataplotter.py
index b16ba5f..e626c23 100755
--- a/RFG_ADC_dataplotter.py
+++ b/RFG_ADC_dataplotter.py
@@ -22,6 +22,7 @@
 import argparse
 import io
 import os
+import signal
 import sys
 import threading
 import time
@@ -1732,11 +1733,42 @@ def main():
         )
 
     ani = FuncAnimation(fig, update, interval=interval_ms, blit=False)
+    cleanup_done = False
 
-    plt.show()
-    # Нормальное завершение при закрытии окна
-    stop_event.set()
-    reader.join(timeout=1.0)
+    def _cleanup():
+        nonlocal cleanup_done
+        if cleanup_done:
+            return
+        cleanup_done = True
+        stop_event.set()
+        reader.join(timeout=1.0)
+
+    def _handle_sigint(_signum, _frame):
+        _cleanup()
+        try:
+            plt.close(fig)
+        except Exception:
+            pass
+
+    prev_sigint = signal.getsignal(signal.SIGINT)
+    try:
+        fig.canvas.mpl_connect("close_event", lambda _evt: _cleanup())
+    except Exception:
+        pass
+    try:
+        signal.signal(signal.SIGINT, _handle_sigint)
+    except Exception:
+        prev_sigint = None
+
+    try:
+        plt.show()
+    finally:
+        _cleanup()
+        if prev_sigint is not None:
+            try:
+                signal.signal(signal.SIGINT, prev_sigint)
+            except Exception:
+                pass
 
 
 def run_pyqtgraph(args):
@@ -1787,6 +1819,10 @@ def run_pyqtgraph(args):
         app.setApplicationName(str(args.title))
     except Exception:
         pass
+    try:
+        app.setQuitOnLastWindowClosed(True)
+    except Exception:
+        pass
     win = pg.GraphicsLayoutWidget(show=True, title=args.title)
     win.resize(1200, 600)
 
@@ -2279,8 +2315,26 @@ def run_pyqtgraph(args):
     timer = pg.QtCore.QTimer()
     timer.timeout.connect(update)
     timer.start(interval_ms)
+    sigint_requested = threading.Event()
+    sigint_timer = pg.QtCore.QTimer()
+    sigint_timer.setInterval(50)
+    sigint_timer.timeout.connect(lambda: app.quit() if sigint_requested.is_set() else None)
+    sigint_timer.start()
+    cleanup_done = False
 
     def on_quit():
+        nonlocal cleanup_done
+        if cleanup_done:
+            return
+        cleanup_done = True
+        try:
+            timer.stop()
+        except Exception:
+            pass
+        try:
+            sigint_timer.stop()
+        except Exception:
+            pass
         stop_event.set()
         reader.join(timeout=1.0)
         if control_window is not None:
@@ -2289,12 +2343,50 @@ def run_pyqtgraph(args):
             except Exception:
                 pass
 
+    def _handle_sigint(_signum, _frame):
+        sigint_requested.set()
+
+    prev_sigint = signal.getsignal(signal.SIGINT)
+    try:
+        signal.signal(signal.SIGINT, _handle_sigint)
+    except Exception:
+        prev_sigint = None
+
+    orig_close_event = getattr(win, "closeEvent", None)
+
+    def _close_event(event):
+        try:
+            if callable(orig_close_event):
+                orig_close_event(event)
+            else:
+                event.accept()
+        except Exception:
+            try:
+                event.accept()
+            except Exception:
+                pass
+        try:
+            app.quit()
+        except Exception:
+            pass
+
+    try:
+        win.closeEvent = _close_event  # type: ignore[method-assign]
+    except Exception:
+        pass
+
     app.aboutToQuit.connect(on_quit)
     win.show()
     exec_fn = getattr(app, "exec_", None) or getattr(app, "exec", None)
-    exec_fn()
-    # На случай если aboutToQuit не сработал
-    on_quit()
+    try:
+        exec_fn()
+    finally:
+        on_quit()
+        if prev_sigint is not None:
+            try:
+                signal.signal(signal.SIGINT, prev_sigint)
+            except Exception:
+                pass
 
 
 if __name__ == "__main__":