diff --git a/script/test/DemoCscanPseudo4.py b/script/test/DemoCscanPseudo4.py
new file mode 100644
index 00000000..6832de7c
--- /dev/null
+++ b/script/test/DemoCscanPseudo4.py
@@ -0,0 +1,30 @@
+class PseudoMotor(PositionerBase, Speedable):    
+    def __init__(self):
+        PositionerBase.__init__(self)
+        self.readback  = 0.0
+        self.setpoint  = 0.0
+        self.settime = time.time()
+        
+    def doRead(self):     
+        self.setpoint
+        
+    def doWrite(self, val):
+        self.settime = time.time()
+        self.setpoint = val
+
+    def doReadReadback(self, val):
+         offset = self.setpoint - self.readback
+         d = (self.speed * (time.time() - self.settime))
+         d = min(d, abs(offset))         
+         self.position = self.readback + d if offset>0 else self.readback -d
+         return self.position
+
+    def getSpeed(self):
+        return 3.0
+        
+positioner =  PseudoMotor()       
+add_device(positioner, True);
+
+show_panel("PseudoMotor")
+cscan(positioner, MachineCurrent, 0, 10, 1.0)
+