add fscan2d for tdxrd/nscope

id11/scans/fscans.py

@@ -146,11 +146,11 @@ class ID11FScan2D(FScanDiagRunner):
             pars.latency_time = self._min_latency_time
         min_step_time = pars.acq_time + readout_time + pars.latency_time
        
-        if pars.step_time < min_step_time:
-            pars.step_time = min_step_time 
+        if pars.fast_step_time < min_step_time:
+            pars.fast_step_time = min_step_time 
 
         super().validate()
-        pars.step_time=0.
+        pars.fast_step_time=0.
 
     def __call__(self, slow_motor, slow_start, slow_step, slow_npoints,
                        fast_motor, fast_start, fast_step, fast_npoints, acq_time, mode="REWIND", **kwargs):