#Creating the raw channel device and the averager
#ch1 = Channel("SARFE10-PBPG050:HAMP-INTENSITY",'d',alias="CH1")
ch1 = create_channel_device("SARFE10-PBPG050:HAMP-INTENSITY", type='d', size=None, deviceName="CH1" )
av1 = create_averager(ch1, count = 30, interval = 1.0, name="AV1")
ch1.monitored = True
av1.monitored = True
add_device(ch1, True)
add_device(av1, True)

#Creating a pseudo-device reading the stdev
class StDev(ReadonlyRegisterBase):
    def doRead(self):        
        return AV1.stdev.read()       
sd1= StDev("SD1")
add_device(sd1, True)

#Forwarding the change events of the averager to the psudo-device so stripchart is updated
class MyListener (DeviceListener):
    def onCacheChanged(self, device, value, former, timestamp, valueChange):
        SD1.update()
l1 = MyListener()
av1.addListener(l1)