import  ch.psi.pshell.epics.ChannelDouble as ChannelDouble
A1 = ChannelDouble("Actuator1", "SARUN07-UIND030:I-SET")
S1 = ChannelDouble("Sensor1",   "SARFE10-PBPG050:HAMP-INTENSITY-CAL")
A1.initialize()
S1.initialize()
A1_init = A1.read()
A1i    = -1.0
A1f    = 1.2
nstep  = 22
lat    = 0.11
nav    = 50
plt    = plot(None, title="Output")[0]
plt.clear()
plt.setStyle(plt.Style.ErrorY)
plt.addSeries(LinePlotErrorSeries("Sensor1", Color.red))
def after_sample(record, scan):
    plt.getSeries(0).appendData(record.positions[0], record.readables[0].mean, record.readables[0].stdev)
try:
    S1_averager = create_averager(S1, nav, lat)
    time.sleep(1.0)
    r = lscan(A1, S1_averager, A1i, A1f, nstep, latency=2.0, after_read = after_sample)
    Act1     = r.getPositions(0)
    S1mean   = [val.mean for val in r.getReadable(0)]
    S1rms    = [val.stdev for val in r.getReadable(0)]
finally:
    A1.write(A1_init)
    A1.close()
    S1.close()