pre uc480 integration

hardware/tektronix_base.py

@@ -1411,10 +1411,13 @@ class TektronixOscilloscopeBase:
         if not self.get_fastframe_state():
             raise RuntimeError("FastFrame is not enabled. Enable it with set_fastframe_state(True)")
 
-        # Get the frame count
-        frame_count = self.get_fastframe_count()
-        if frame_count <= 0:
-            raise RuntimeError(f"Invalid FastFrame count: {frame_count}")
+        # Use the number of frames actually acquired, not the configured maximum.
+        # If the stage stops early, fewer triggers arrive and the scope captures
+        # fewer frames than configured — reading the configured count would block.
+        acquired = int(self.query("ACQuire:NUMFRAMESACQuired?"))
+        if acquired <= 0:
+            raise RuntimeError(f"Scope acquired 0 FastFrame frames — no data to read")
+        frame_count = acquired
 
         # Send a single CURVe? query - scope will return all frames
         self.write("CURVe?")