PUND_example.py

from PUND_waveform import create_waveform
from SMU_device import SMUDevice
from plot_fig import *
from cycling import cycle
import time, os
import datetime


time.sleep(0)
device = 'SMU1'

ifcycle = False
terminal = 'front'

area = 25 ** 2 * 1e-8
save = True
now = datetime.datetime.now()
save_name = f'{now.strftime("%m-%d-%y time-%H %M")}'
dir = os.path.join(os.getcwd(), "2021-03-10", "field7_c5_25um")

"""
params is a dictionary with key parameters for a PUND sweep.

Vf - first voltage
Vs - second voltage
rise - number of measurements during the rise
hold - number of measurements to be done while maintaining the applied voltage
space - number of measurements between pulses
n_cycles - number of PUND cycles

Time required for a single measurement is approximately 0.5 ms. It is the limit for this SMU. The only way to control
rise/hold/space time is to change the number of measurements.
"""

params = {
        'Vf': -2.5,
        'Vs': 2.5,
        'rise': 20,
        'hold': 2,
        'space': 15,
        'n_cycles': 2,
        'growth_rate': 10,
        }

# connect_pv(ser) 7.2366859912872314


with SMUDevice(device) as smu:
        smu.set_terminal(terminal)
        if ifcycle:
            cycle(smu, 100, params['Vf'], params['Vs'])
            # cycle(smu, 10, params['Vf'], params['Vs'])
        smu.setup_sense_subsystem(compl=1e-4, range=1e-4, int_time=0, counts=1)
        smu.setup_source_subsystem()
        waveform = create_waveform(params, by_rate=True)
        smu.setup_voltage_list_sweep(waveform, params['n_cycles'])

        smu.write_command('INIT')
        smu.wait()

        smu.check_for_errors()
        data = smu.get_traces()

plot_fig(data, params, area, save=save, path=dir, name=save_name)

if save:
    save_data(data, path=dir, name=save_name + ".h5")