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SMU_device.py
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import pyvisa
import numpy as np
class SMUDevice:
def __init__(self, instruments_name):
self.device = None
self.instr_name = instruments_name
self.connect(verbose=False)
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.device.close()
def connect(self, verbose=True):
"""
Connect to the device and make some preset. It has to be called after the class creation!
"""
rm = pyvisa.ResourceManager()
try:
self.device = rm.open_resource(self.instr_name, write_termination = "\n")
except pyvisa.errors.VisaIOError:
print(f'Device {self.instr_name} is not present in the system, check the connections.')
self.device.write('*RST')
self.device.write('*CLS')
self.device.write('*IDN?')
device_info = self.device.read()
if verbose:
print(f'Device \n{device_info}is connected!')
def write_command(self, command):
self.device.write(command)
def wait(self):
"""
Waiting for the device to finish.
"""
self.device.write('*OPC?')
while True:
try:
self.device.read()
break
except pyvisa.errors.VisaIOError:
continue
def get_traces(self):
self.device.write(':TRACe:ACTual:END?')
ending_index = int(self.device.read())
self.device.write(f':TRAce:DATA? 1, {ending_index}, "defbuffer1", RELative, SOURce, READing')
result = self.device.read()
result = result.split(',')
result = list(map(float, result))
data = {
'time': result[::3],
'source': result[1::3],
'reading': result[2::3]
}
return data
def setup_sense_subsystem(self, int_time=0.1, autorange=False, compl=1e-2, range=1e-3, counts=1):
nplc_time = int_time / (1 / 60) # 60 Hz power supply
self.device.write(f'SENS:AZER:ONCE')
self.device.write(f'SENS:CURR:AZER OFF')
self.device.write(f'SENS:CURR:NPLC {max(0.01, nplc_time)}')
if autorange:
self.device.write(f'SENS:CURR:RANG:AUTO 1')
else:
self.device.write(f'SENS:CURR:RANG:AUTO 0')
self.device.write(f'SENS:CURR:RANG {range}')
self.device.write(f'SOUR:VOLT:ILIM {compl}')
if counts != 1:
self.device.write(f'SENS:COUNT {counts}')
def setup_source_subsystem(self, range=20, autorange=False, readback=False, delay=0):
self.device.write(f'SOUR:FUNC VOLT')
self.device.write(f'SOUR:VOLT:RANG {range}')
if autorange:
self.device.write(f'SOUR:VOLT:RANG:AUTO ON')
else:
self.device.write(f'SOUR:VOLT:RANG:AUTO OFF')
if delay is not None:
self.device.write(f'SOUR:VOLT:DEL:AUTO OFF')
self.device.write(f'SOUR:VOLT:DEL 0.001')
self.device.write(f'SOUR:VOLT:DEL {delay}')
else:
self.device.write(f'SOUR:VOLT:DEL:AUTO ON')
if readback:
self.device.write(f'SOUR:VOLT:READ:BACK ON')
else:
self.device.write(f'SOUR:VOLT:READ:BACK OFF')
def setup_staircase_sweep(self, v_from, v_to, n_steps, delay=1e-4):
"""
set up staircase sweep (DC IV measurements)
:param v_from: float (start value)
:param v_to: float (start value)
:param n_steps: int (number of steps)
:param delay: float (delay between a voltage increase and a measurement)
"""
self.device.write(f'SOUR:SWE:VOLT:LIN {v_from}, {v_to}, {n_steps}, {delay}, 1, AUTO')
def setup_voltage_list_sweep(self, waveform, n_times):
buffer_overrun = False
waveforms = None
n_points = len(waveform)
if len(waveform) > 100:
waveform_np = np.array(waveform)
waveforms = np.array_split(waveform_np, int(np.ceil(len(waveform)/100)))
buffer_overrun = True
waveform = waveforms[0]
waveform = map(str, waveform)
waveform = ', '.join(waveform)
self.device.write(f'SOUR:LIST:VOLT {waveform}')
if buffer_overrun:
for waveform in waveforms[1:]:
waveform = map(str, waveform)
waveform = ', '.join(waveform)
self.device.write(f'SOUR:LIST:VOLT:APP {waveform}')
self._define_sweep_trigger_model(n_points, n_times)
def check_for_errors(self):
"""
Check if some errors occurred during the measurements. Raise warning in that case.
Errors might appear in reversed order.
"""
self.device.write('SYST:ERR:COUN?')
n_errors = int(self.device.read())
if n_errors != 0:
errors = []
for i in range(n_errors):
self.device.write('SYST:ERR:NEXT?')
errors.append(self.device.read())
errors = ''.join(errors)
raise Warning(f'An error occurred during measurements:\n {errors}')
def turn_on_display(self):
self.device.write(f'DISP:LIGH:STAT ON50')
def turn_off_display(self):
self.device.write(f'DISP:LIGH:STAT BLAC')
def set_terminal(self, name):
if name == "rear":
self.device.write('ROUT:TERM REAR')
elif name == "front":
self.device.write('ROUT:TERM FRON')
else:
raise Exception(f"Expected 'rear' or 'front', found {name}")
def close(self):
self.device.close()
def _define_sweep_trigger_model(self, n_points, n_times, configuration_list="VoltCustomSweepList"):
self.device.write('TRIG:LOAD "Empty"')
self.device.write('TRIG:BLOC:BUFF:CLEAR 1')
self.device.write(f'TRIG:BLOC:CONF:RECALL 2, "{configuration_list}"')
self.device.write('TRIG:BLOC:SOUR:STAT 3, ON')
self.device.write('TRIG:BLOC:BRAN:ALW 4, 6')
self.device.write(f'TRIG:BLOC:CONF:NEXT 5, "{configuration_list}"')
self.device.write('TRIG:BLOC:MEAS 6')
self.device.write(f'TRIG:BLOC:BRAN:COUN 7, {n_points}, 5')
self.device.write(f'TRIG:BLOC:BRAN:COUN 8, {n_times}, 2')
self.device.write('TRIG:BLOC:SOUR:STAT 9, OFF')
self.device.write('TRIG:BLOC:BRAN:ALW 10, 0')