def set_dccurrent(self, **kwargs):
# if first time, initialize instrument
if not self.ready_dccurrent:
print('Connecting to dc current source...')
self.instr_dccurrent = instruments_gpib.SR830()
self.ready_dccurrent = True
i = kwargs.get('i', 0)
dbl_bias = kwargs.get('dbl_bias', False)
if dbl_bias: # 20 mA range
v = float(i) / self.daqparams.i_per_v_dcbias / 2
if abs(v) > 10:
v = 10 if v > 10 else -10
print('Exceeded max V. Setting V = %f' % (v))
self.instr_dccurrent.dacout(self.daqparams.dacch_bias, v)
self.instr_dccurrent.dacout(self.daqparams.dacch_bias2, v)
if 't' in kwargs: # if pulse
sleep(kwargs['t'])
self.instr_dccurrent.dacout(self.daqparams.dacch_bias, 0)
self.instr_dccurrent.dacout(self.daqparams.dacch_bias2, 0)
else: # 10 mA range
v = float(i) / self.daqparams.i_per_v_dcbias
if abs(v) > 10:
v = 10 if v > 10 else -10
print('Exceeded max V. Setting V = %f' % (v))
self.instr_dccurrent.dacout(self.daqparams.dacch_bias, v)
if 't' in kwargs: # if pulse
sleep(kwargs['t'])
self.instr_dccurrent.dacout(self.daqparams.dacch_bias, 0)
if dbl_bias:
self.instr_dccurrent.dacout(self.daqparams.dacch_bias2, 0)
def get_dvdi(self, ch=1):
# if first time, initialize instrument
if not self.ready_lockin:
print('Connecting to lockin...')
self.instr_lockin = instruments_gpib.SR830()
self.ready_lockin = True
#return self.instr_lockin.getdisp(ch)/self.daqparams.gain/ \
# (self.daqparams.ampl_lockin*self.daqparams.i_per_v_acbias)
return self.instr_lockin.getdisp(ch)/self.daqparams.gain/ \
self.daqparams.ampl_lockin
def set_accurrent(self, **kwargs):
# if first time, initialize instrument
if not self.ready_lockin:
print('Connecting to lockin...')
self.instr_lockin = instruments_gpib.SR830()
self.ready_lockin = True
if 'ampl' in kwargs:
ampl = kwargs['ampl'] / self.daqparams.i_per_v_acbias
self.instr_lockin.sinelvl(ampl)
if 'freq' in kwargs:
self.instr_lockin.freq(kwargs['freq'])
def set_vout(self, dev, ch, v):
# Helper function for DAC out.
if dev == 'mccdaq':
if not self.ready_mccdaq:
print('First use of MCCDAQ...')
self.instr_mccdaq = instruments_mccdaq.MCCDAQ()
self.ready_mccdaq = True
self.instr_mccdaq.vout(ch, v)
#print(v)
else:
if not self.ready_SR830:
print('First use of SR830...')
self.instr_sr830 = instruments_gpib.SR830()
self.ready_sr830 = True
self.instr_sr830.dacout(ch, v)
def set_heat(self, **kwargs):
# if first time, initialize instrument
if not self.ready_heat:
print('Connecting to heat source...')
self.instr_heat = instruments_gpib.SR830()
self.ready_heat = True
i = kwargs.get('i', .09)
if abs(i) > .1:
i = .1 if i > .1 else -.1
print('Exceeded max I. Setting I = %f' % (i))
v = i / self.daqparams.i_per_v_heat
self.instr_heat.dacout(self.daqparams.dacch_heat, v)
if 't' in kwargs: # if pulse
sleep(kwargs['t'])
self.instr_heat.dacout(self.daqparams.dacch_heat, 0)
def ramp_vout(self, dev, ch, **kwargs):
# Helper function for DAC ramp out.
step = kwargs.get('step', 0.001)
# setup dependent on DAC
if dev == 'mccdaq':
if not self.ready_mccdaq:
print('First use of MCCDAQ...')
self.instr_mccdaq = instruments_mccdaq.MCCDAQ()
self.ready_mccdaq = True
v1 = kwargs['v1']
v2 = kwargs['v2']
delay_dac = 0.01
#self.instr_mccdaq.vout(ch, v)
else:
if not self.ready_SR830:
print('First use of SR830...')
self.instr_sr830 = instruments_gpib.SR830()
self.ready_sr830 = True
v1 = self.instr_sr830.get_auxvout(self.daqparams.dacch_field)
v2 = kwargs['v']
delay_dac = 0.1
#self.instr_sr830.dacout(ch, v)
# common codes independent of DAC
if v1 == v2:
varray = [v1]
else:
step = np.sign(v2 - v1) * abs(step)
varray = np.arange(v1, v2, step)
t0 = time()
for v in varray[1:]:
t = time()
if t - t0 > 1:
print('%10.4f' % v, end="", flush=True)
t0 = t
self.set_vout(dev, ch, v)
sleep(delay_dac)
print('%10.4f' % v2, end="\n", flush=True)
self.set_vout(dev, ch, v2)
def sqwave_field(self, **kwargs):
# if first time, initialize instrument
if not self.ready_field:
print('Connecting to field source...')
self.instr_field = instruments_gpib.SR830()
self.ready_field = True
h = kwargs.get('h', 0)
v = h / self.daqparams.h_per_i / self.daqparams.i_per_v_coil
if abs(v) > 2:
v = 2 if v > 2 else -2
print('Exceeded max V. Setting V = %f' % (v))
while 1:
self.instr_field.dacout(self.daqparams.dacch_field, v)
h1 = self.instr_field.get_auxvout(self.daqparams.dacch_field)\
*self.daqparams.h_per_i*self.daqparams.i_per_v_coil
self.instr_field.dacout(self.daqparams.dacch_field, 0)
h1 = self.instr_field.get_auxvout(self.daqparams.dacch_field)\
*self.daqparams.h_per_i*self.daqparams.i_per_v_coil
if 't' in kwargs: # if pulse
sleep(kwargs['t'])
self.instr_field.dacout(self.daqparams.dacch_field, 0)
def set_field(self, **kwargs):
if ('ramp' in kwargs and kwargs['ramp'] == True) or\
('h1' in kwargs and 'h2' in kwargs):
ramp = True
else:
ramp = False
vmax = self.daqparams.i_coil_max / self.daqparams.i_per_v_coil
if not ramp: # simple set
h = kwargs.get('h', 0)
v = h / self.daqparams.h_per_i / self.daqparams.i_per_v_coil
if abs(v) > vmax:
v = vmax if v > vmax else -vmax
print('Max V is %f. Setting V = %f' % (vmax, v))
print('Field: ', self.daqparams.dac_field, ', Ch',\
self.daqparams.dacch_field, ', %6.4f V'%v)
self.set_vout(self.daqparams.dac_field, self.daqparams.dacch_field,
v)
# if pulse, delay and reset.
if 't' in kwargs:
sleep(kwargs['t'])
self.set_vout(self.daqparams.dac_field,\
self.daqparams.dacch_field, 0)
else: # ramp
step = kwargs.get('step', 5)
if self.daqparams.dac_field == 'mccdaq':
h1 = kwargs['h1']
h2 = kwargs['h2']
delay_dac = 0.01
elif 'h' in kwargs: # SR830 with only final field given
h2 = h
if not self.ready_sr830:
print('First use of SR830...')
self.instr_sr830 = instruments_gpib.SR830()
self.ready_sr830 = True
h1 = self.instr_sr830.get_auxvout(self.daqparams.dacch_field)
else: # SR830 with two fields given
h1 = kwargs['h1']
h2 = kwargs['h2']
delay_dac = 0.1
# voltage out
v1 = h1 / self.daqparams.h_per_i / self.daqparams.i_per_v_coil
v2 = h2 / self.daqparams.h_per_i / self.daqparams.i_per_v_coil
vstep = step / self.daqparams.h_per_i / self.daqparams.i_per_v_coil
if abs(v1) > vmax:
v1 = vmax if v1 > vmax else -vmax
print('Max V is %f. Setting V = %f' % (vmax, v1))
if abs(v2) > vmax:
v2 = vmax if v2 > vmax else -vmax
print('Max V is %f. Setting V = %f' % (vmax, v2))
self.ramp_vout(self.daqparams.dac_field,\
self.daqparams.dacch_field, v1=v1, v2=v2, step=vstep)
# if pulse, delay and reset.
if 't' in kwargs:
sleep(kwargs['t'])
self.ramp_vout(self.daqparams.dac_field,\
self.daqparams.dacch_field, v1=v2, v2=0, step=vstep)