scaler.stop()                            #caput("X10DA-ES-SCALER.CNT", 0)
scaler.channels[0].setPreset(False)       #caput("X10DA-ES-SCALER.G1", 0)
#scaler.channels[0].setPresetValue(0)
scaler.setOneShot()                       #caput("X10DA-ES-SCALER.CONT", 0)

caput("X10DA-ES1:START-CSMPL", 1)
caput("X10DA-ES1:TOTAL-CYCLES", 5)
caput("X10DA-ES1:SMPL-BTN", 1)

i0 = CrlogicSensor("I0", "SCALER12", True)
i1 = CrlogicSensor("I1", "SCALER13", True)
i2 = CrlogicSensor("I2", "SCALER14", True)
ref = CrlogicSensor("ScalerRef", "SCALER15", True)

class AbsCalc(Readable):
    def read(self):        
        d = math.fabs(i1.take())
        return  float('NaN') if (d==0)  else math.log(math.fabs(i0.take()) /d)
abs_calc = AbsCalc()  

class ECalc(Readable):
    def read(self):   
        d = crystal.take() * math.sin( math.radians(bragg.readback.take()))
        return  float('NaN') if (d==0)  else (12.39842 / d)
e_calc = ECalc()
sensors = [RegisterCache(crystal), i0, i1, i2, ref, abs_calc, e_calc]

bragg.move(12.3)
scaler.start()
r1 = hscan(crlogic_config, bragg, sensors, 12.3, 12.6, 0.002, 1, False)