Updated wavemeter to emit with less frequency to not overwhelm the lo…

…gic.

src/qudi/hardware/wavemeter/high_finesse_wavemeter.py

@@ -54,6 +54,11 @@ def on_activate(self):
 
         self._data = np.zeros((4, 1))
 
+        self.__timer = QtCore.QTimer()
+        self.__timer.setSingleShot(False)
+        self.__timer.timeout.connect(self.__timer_callback)
+        self.__timer.start(1)  # 100 ms timer
+
         @wlmData.CALLBACK_TYPE
         def cb(mode, _intval, dblval):
             self._update(mode, _intval, dblval)
@@ -74,6 +79,9 @@ def on_deactivate(self):
         """ Deactivate module.
         """
         self._dll.Instantiate(wlmConst.cInstNotification, wlmConst.cNotifyRemoveCallback, None, 0)
+        self.__timer.stop()
+        self.__timer.timeout.disconnect()
+        self.__timer = None
 
 
     def get_wavelengths(self) -> np.ndarray:
@@ -105,5 +113,11 @@ def _update(self, mode, _intval, dblval):
 
         if self.module_state() == 'locked':
             self._data[i] = dblval
+
+
+
+    def __timer_callback(self):
+        """ Callback function for the timer. """
+        if self.module_state() == 'locked':
             self.sigWavelengthUpdated.emit(self._data)