Fix default delay

src/python_spectrometer/daq/simulator.py

@@ -55,7 +55,7 @@ def with_delay(meth):
         skip_wait = getattr(wrapped, '__with_delay', False)
 
         if delay is True:
-            delay = 1 / settings['df']
+            delay = settings['n_pts'] / settings['fs']
 
         it = meth(self, **settings)
         while True: