def exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2):
'''
:param Switch: GPIB switch matrix object
:param CurrentSource: GPIB current source object
:param card1, card2: Target Cards 1 and 2
:param channel1, channel2: Target Channels 1 and 2
:return: exits sweep cleanly
Called by:
-Virtually all functions in IV_curve_v3
'''
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, shorts)
time.sleep(.2)
vf.open_channel(Switch, card1, channel1)
vf.open_channel(Switch, card2, channel2)
def plot_Resistance_Array_live(app, curve, card1, card2, channel1, channel2, max_current,continuity=False,extra_res=0):
'''
Plots a sweep from 0 to 3mA and returns the values plotted
Updates a live plot with current on x axis, voltage on y axis
:param app: pyqtgraph construct
:param curve: pyqtgraph constuct
:param card1, card 2: Target card2
:param channel1, channel2: Target Channels
:param max_Current: max_current before function breaks
:return: I-Values: Arrays of Current Values
:return: V-Values: Array of Voltage Values
:return: R-Values: Array of Resistance Values
:return: Funykgraphs Any Sweeps that had non-linear slopes (Determined by Lin-regress)
Called By:
-Measure_Via_Resistance
-Measure_Device_Resistance
-Resistance Curve
-Measure_Resistor_Arrays
Calls on:
-All Visa Functions
Uses:
-Linregress to determine whether a graph is linear or not
-Looks for a negative slope or an r^2 value below .9
'''
global go
go = 1
# current initialization variables
# lower range has less noise
Irange = 1e-02
compliance_voltage = 30.
# get GPIB instruments
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
Switch = vf.get_switch()
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1,channel1) # instead of card, used to be 1
time.sleep(0.2)
vf.close_channel(Switch,card2,channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.open_short(Switch, card1, iv.shorts)
time.sleep(.2)
#Going to use lists to start with for flexibility, even though slower than arrays
I_values = []
V_values = []
R_values = []
# starting 7/24: voltmeter reads non zero when the current is zero
offset = vf.read_voltage_fast(Voltmeter, VDwellTime)
print('Offset: %s' %offset)
#Sweep Current up
if continuity:
step=max_current/10
else:
step = max_current / 30
print('\nChannel %d:%d SweepUp Current:'%(channel1,channel2))
for I in np.arange(0, max_current, step):
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
V=V-I*extra_res
I_values.append(I)
# new, for fixing the offset 7/24:
V_values.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
app.processEvents()
print('%e '%I,end=" ")
if go==0: # input passed from GUI
iv.exitfunc(Switch,CurrentSource,card1,card2,channel1,channel2)
return 0,0,0,0
funkygraphs=False
m,_,r2,_,_=stats.linregress(I_values,V_values)
r2=r2**2
if m <= 0 or r2<=.9:
funkygraphs=True
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, iv.shorts)
time.sleep(.2)
vf.open_channel(Switch,card1,channel1)
vf.open_channel(Switch,card2,channel2)
return I_values, V_values, R_values, funkygraphs
def plot_pcm3b(app, curve, card1, card2, channel1, channel2, max_current):
'''
Plots a sweep from 0 to 3mA and returns the values plotted
Updates a live plot with current on x axis, voltage on y axis
Looks for discontinuity
'''
global go
go = 1
# current initialization variables
# lower range has less noise
Irange = 1.1e-01
compliance_voltage = 30.
# get GPIB instruments
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
Switch = vf.get_switch()
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
Vrange=30
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1,channel1) # instead of card, used to be 1
time.sleep(0.2)
vf.close_channel(Switch,card2,channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.open_short(Switch, card1, iv.shorts)
time.sleep(.2)
I_values = []
V_values = []
R_values = []
slope=0
Imax=0
# starting 7/24: voltmeter reads non zero when the current is zero
offset = vf.read_voltage_fast(Voltmeter, VDwellTime)
print('Offset: %s' %offset)
#Sweep Current up
step = max_current / 50
print('\nChannel %d:%d SweepUp Current:'%(channel1,channel2))
for I in np.arange(0, max_current, step):
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
# new, for fixing the offset 7/24:
V_values.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
app.processEvents()
print('%e '%I,end=" ")
if go==0: # input passed from GUI
iv.exitfunc(Switch,CurrentSource,card1,card2,channel1,channel2)
return 0,0,0,0
'''
Assumes that the slope in the region from 0 to step*6 mA (currently step =2ma so 12ma)
is the resisitive slope when superconducting... it then looks for strong changes in slope, based off the delta
so if the slope starts at X but reaches a discontinuity and then becomes less than (1-delta)*x the program will
detect it as the Imax point
'''
slope=sum(R_values[:5])/6
delta=.35
discont=False
count=8
while not discont:
if R_values[count]<slope*(1-delta) or R_values[count]>slope*(1+delta):
discont=True
Imax=I_values[count]
count+=1
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, iv.shorts)
time.sleep(.2)
vf.open_channel(Switch,card1,channel1)
vf.open_channel(Switch,card2,channel2)
return I_values, V_values, R_values, Imax,slope
def sweep_current_flux(app, curves, current_point, card1, card2, channel1,
channel2, I_min, I_max, step, I_minflux, I_maxflux,
stepflux, down):
"""
Inputs are min and max current for sweep, steps, card and channels for switch
Returns an array with current steps, measured voltages, and calculated resistances
"""
curve_colors = ['b', 'g', 'r', 'c', 'm', 'y', 'k', 'w']
I_values_all = [] #(Ibias)
V_values_all = []
current_x = []
current_y = []
##INITIALIZATION OF HARDWARE##
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
FluxSource = vf.get_current_flux()
Switch = vf.get_switch()
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
vf.intialize_current_yoko(FluxSource, Fluxrange, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1, channel1)
time.sleep(0.2)
vf.close_channel(Switch, card2, channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.turnon_current_yoko(FluxSource)
time.sleep(0.2)
vf.open_short(Switch, card1, shorts)
time.sleep(0.2)
time.sleep(0.2)
curve_counter = 0
global go
go = 1
colorsused = []
for Iflux in np.arange(I_minflux, I_maxflux, stepflux):
I_values = []
V_values = []
vf.set_current_fast_yoko(FluxSource, Iflux) #Set the flux current
#vf.intialize_voltage(Voltmeter, nplc, Vrange)
offset = vf.read_voltage_fast(Voltmeter, VDwellTime)
time.sleep(0.2)
##CURRENT SWEEPS##
#Sweep Current up
print('Starting sweep up with Iflux =', Iflux)
for I in np.arange(I_min, I_max, step):
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
V_values.append(V)
current_x.append(I)
current_y.append(V)
curves[curve_counter].setData(
I_values,
V_values,
symbol='o',
symbolBrush=curve_colors[curve_counter % 8],
symbolSize=5)
current_point.setData(current_x,
current_y,
symbol='o',
symbolBrush='r',
symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go == 0: #If the stop button on the GUI is pressed
exitfunc(Switch, CurrentSource, card1, card2, channel1,
channel2)
vf.set_current_fast_yoko(FluxSource, 0)
return 0, 0, 0
if down:
print('Starting sweep down')
#Sweep Current down
for I in np.arange(I_max - step, I_min, -step):
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
V_values.append(V)
current_x.append(I)
current_y.append(V)
curves[curve_counter].setData(
I_values,
V_values,
symbol='o',
symbolBrush=curve_colors[curve_counter % 8],
symbolSize=5)
current_point.setData(current_x,
current_y,
symbol='o',
symbolBrush='r',
symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go == 0: #If the stop button on the GUI is pressed
exitfunc(Switch, CurrentSource, card1, card2, channel1,
channel2)
vf.set_current_fast_yoko(FluxSource, 0)
return 0, 0, 0
V_values = np.array(V_values)
V_values = V_values - offset
#SHUT IT DOWN!##
print('Exited current sweep with Iflux =', Iflux)
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.1)
I_values_all.append(I_values)
V_values_all.append(V_values)
colorsused.append(curve_colors[curve_counter % 8])
curve_counter = curve_counter + 1
print('Finished all current sweeps')
#Safe all of the hardware
vf.set_current_fast_yoko(FluxSource, 0)
time.sleep(0.2)
vf.close_short(Switch, card1, shorts)
time.sleep(0.2)
if channel1 != 10:
vf.open_channel(Switch, card1, channel1)
vf.open_channel(Switch, card2, channel2)
#Iflux=np.arange(I_minflux, I_maxflux, stepflux)
return I_values_all, V_values_all, colorsused
def sweep_current(app, curve, current_point, ic_curve, plot, card1, card2,
channel1, channel2, I_min, I_max, step):
"""
Inputs are min and max current for sweep, steps, card and channels for switch
Returns an array with current steps, measured voltages, and calculated resistances
"""
##VARIABLE DECLARATIONS##
#Going to use lists to start with for flexibility, even though slower than arrays
I_values = []
V_values = []
current_x = []
current_y = []
##INITIALIZATION OF HARDWARE##
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
Switch = vf.get_switch()
vf.intialize_switch_all(
Switch) #For some reason causes things to break. ADD THIS BACK
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1, channel1)
time.sleep(0.2)
vf.close_channel(Switch, card2, channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.open_short(Switch, card1, shorts)
time.sleep(0.2)
offset = vf.read_voltage_fast(Voltmeter, VDwellTime)
global go
go = 1
#Sweep Current up
print('Starting sweep up')
for I in np.arange(I_min, I_max, step):
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
V_values.append(V)
current_x.append(I)
current_y.append(V)
curve.setData(I_values,
V_values,
symbol='o',
symbolBrush='w',
symbolSize=5)
current_point.setData(current_x,
current_y,
symbol='o',
symbolBrush='r',
symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go == 0: #If the stop button on the GUI is pressed
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0, 0, 0
print('Starting sweep down')
#Sweep Current down
for I in np.arange(I_max - step, I_min, -step):
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
V_values.append(V)
current_x.append(I)
current_y.append(V)
curve.setData(I_values,
V_values,
symbol='o',
symbolBrush='w',
symbolSize=5)
current_point.setData(current_x,
current_y,
symbol='o',
symbolBrush='r',
symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go == 0: #If the stop button on the GUI is pressed
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0, 0, 0
#SHUT IT DOWN!##
print("Exited current sweep")
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, shorts)
time.sleep(0.2)
if channel1 != 10:
vf.open_channel(Switch, card1, channel1)
vf.open_channel(Switch, card2, channel2)
V_values = np.array(V_values)
V_values = V_values - offset
I_values = np.array(I_values)
###########
#Magical code for finding the 4 Ics
Ic_values = find_Ic(I_values, V_values) #Ted needs to FIX this
# Ic_values = [0,0,0,0]
###########
# setting labels
for n1 in range(0, len(Ic_values)):
if n1 < 2:
type_of_current = "I" + str(n1)
label = pg.TextItem(text="",
color=(0, 0, 0),
fill=(0, 255, 255),
anchor=(0, -1))
else:
type_of_current = "I" + str(n1)
label = pg.TextItem(text="",
color=(0, 0, 0),
fill=(0, 255, 255),
anchor=(0, 2))
I_c = type_of_current + ':(' + '{:.2E}'.format(
Ic_values[n1]) + ',' + '{:.2E}'.format(
V_values[(np.where(I_values == Ic_values[n1]))[0]][0]) + ')'
label.setText(I_c)
label.setPos(Ic_values[n1],
V_values[(np.where(I_values == Ic_values[n1]))[0]][0])
plot.addItem(label)
ic_curve[n1].setData(
[Ic_values[n1]],
[V_values[(np.where(I_values == Ic_values[n1]))[0]][0]],
symbol='o',
symbolBrush='c',
symbolSize=10)
app.processEvents()
return I_values, V_values, Ic_values
def sweep_current_live_Rn(app, curve, number_of_sweeps, I_min, V_max, step, card1, card2, channel1, channel2,dev):
"""
:param app, curve: (both pyqtgraph constructs)
:param number_of_sweeps: number of sweeps to complete
:param I_min: current sweep start
:param I_maxcurrent: sweep stop
:param step: increment
:param card1, card 2: Target Cards
:param channel1,channel 2: Target Channels
:param dev: Target device
:return: I,V,R arrays
:Graphs: Updates a live plot with current on x axis, voltage on y axis
Called By:
-Get Rn Imax
-Get Rn Imax and save
Calls On:
All Visa Functions
FINDS LINEAR SLOPE:
First checks for hitting Vmax
Next checks for expected length based on size of JJ
then looks for 4 collinear point (using stats.linregress)
then looks at most recent sets of points
if all still linear will exit
"""
# current initialization variabels
Irange = 200e-03
compliance_voltage = 5.
current_limit = 30e-03 # This is highest possible current in A. Shouldn't get this high
# get GPIB instruments
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
Switch = vf.get_switch()
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1,channel1)
time.sleep(.2)
vf.close_channel(Switch,card2,channel2)
time.sleep(.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(.2)
vf.open_short(Switch, card1, shorts)
#Going to use lists to start with for flexibility, even though slower than arrays
I_values = []
V_values = []
R_values = []
global go
go = 1
slopevalue=None
slope_index=None
printstatement=True
for n in range(0, number_of_sweeps):
#Sweep Current up
print('\nChannel %d:%d SweepUp Current:'%(channel1,channel2))
V=0
prev_slope=[]
#measure of how close the previous and current slopes need to be to break
sigma=.05
#how soon to start checking for RN
alpha=100
expected_length=int(30 + alpha * dev.JJ_radius_nom)
print("Expected length: ",expected_length)
for I in np.arange(I_min, current_limit, step):
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
print('%e '%I,end=" ")
V_values.append(V)
if I==0:
R_values.append(0.0)
else:
R_values.append(float(V)/float(I))
if V >= V_max:
print("V_max reached")
break
#MOST OF THIS WIL GO IF WE SWITCH TO NON REAL TIME
#Check for negative to positive first r derivative
if len(I_values)>expected_length:
#first check for inflection points
first_deriv=[]
second_deriv=[]
first_deriv=np.gradient(V_values)
second_deriv=np.gradient(first_deriv)
if np.mean(second_deriv[-6:-3]) <= 0 and np.mean(second_deriv[-3:]) >= 0:
if printstatement:
print("Break due to inflection")
printstatement=False
if slopevalue is None:
slopevalue=np.mean(R_values[-3:-1])
if slope_index is None:
slope_index=len(I_values)
#next check for jumps due to thermal
jumptuner=3
if np.diff(V_values)[-1]>=jumptuner * np.mean(np.diff(V_values)[-4:-1]):
if printstatement:
print("Break due to thermal jump")
printstatement=False
if slopevalue is None:
slopevalue=np.mean(R_values[-3:-1])
if slope_index is None:
slope_index=len(I_values)
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
app.processEvents()
if go == 0:
print("Exiting")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, shorts)
vf.open_channel(Switch,card1,channel1)
vf.open_channel(Switch,card2,channel2)
print(slopevalue)
return I_values, V_values, R_values, slopevalue, slope_index
def sweep_current_vphi(app, curve, current_point, card1, card2, channel1,
channel2, I_minflux, I_maxflux, Iflux_step, Ibias_min,
Ibias_max, Ibias_step):
"""
Inputs are min and max current for sweep for flux of the SQUIDs, step
Returns an array with current steps, measured voltages, and calculated resistances
*********NOTE: This will have to be modified if the second current source is wired through the switch matrix
"""
##VARIABLE DECLARATIONS##
#Going to use lists to start with for flexibility, even though slower than arrays
I_values = []
V_values = []
current_x = []
current_y = []
##INITIALIZATION OF HARDWARE##
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
FluxSource = vf.get_current_flux()
Switch = vf.get_switch()
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(
CurrentSource, Irange, compliance_voltage
) #50 mA instead of 10 mA because we want a larger range for periodicity tests
time.sleep(0.2)
vf.intialize_current_yoko(FluxSource, 50e-03, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1, channel1)
time.sleep(0.2)
vf.close_channel(Switch, card2, channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.turnon_current_yoko(FluxSource)
time.sleep(0.2)
vf.open_short(Switch, card1, shorts)
time.sleep(0.2)
offset = vf.read_voltage_fast(Voltmeter, VDwellTime)
global go
go = 1
for Ibias in np.arange(Ibias_min, Ibias_max, Ibias_step):
vf.set_current_fast_yoko(CurrentSource, Ibias)
I = []
V = []
##CURRENT SWEEPS##
#Sweep Current up
print('Starting sweep with Ibias = %f' % Ibias)
for Iflux in np.arange(I_minflux, I_maxflux, Iflux_step):
vf.set_current_fast_yoko(FluxSource, Iflux)
Vread = vf.read_voltage_fast(Voltmeter, VDwellTime)
I.append(Iflux)
V.append(Vread)
current_x.append(Iflux)
current_y.append(Vread)
curve.setData(I, V, symbol='o', symbolBrush='w', symbolSize=5)
current_point.setData(current_x,
current_y,
symbol='o',
symbolBrush='r',
symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go == 0: #If the stop button on the GUI is pressed
exitfunc(Switch, CurrentSource, card1, card2, channel1,
channel2)
vf.set_current_fast_yoko(FluxSource, 0)
return 0, 0, 0
vf.set_current_fast_yoko(CurrentSource, 0)
vf.set_current_fast_yoko(FluxSource, 0)
I = np.array(I)
V = np.array(V)
I_values.append(I)
V_values.append(V - offset)
if go == 0: #If the stop button on the GUI is pressed
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
vf.set_current_fast_yoko(FluxSource, 0)
return 0, 0, 0
print("Exited current sweep")
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.set_current_fast_yoko(FluxSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, shorts)
time.sleep(0.2)
if channel1 != 10:
vf.open_channel(Switch, card1, channel1)
vf.open_channel(Switch, card2, channel2)
x = I
y = np.full(np.shape(I), np.mean(V))
current_point.setData(x, y, symbol='o', symbolBrush='g', symbolSize=7)
return find_period(I_values, V_values)
def tempandresrun(app,curve,current_point,card1,card2,channel1,channel2):
'''
Written by Nathan
Inputs:
:param app, curve: (both pyqtgraph constructs)
:param current_point: pyqtgraph contruct used to plot current point
:param card1, card2: Target Cards 1 and 2
:param channel1,channel 2: Target Channels
:Graphs: Updates a live plot with current on x axis, voltage on y axis
'''
global go
go = 1
currentlevel=0.1e-3 #We will constantly output 250 uA
Irange = 1e-02
compliance_voltage = 2.
#Initialize voltmeter, current source, and switch matrix
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
Switch = vf.get_switch()
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1, channel1) # instead of card, used to be 1
time.sleep(0.2)
vf.close_channel(Switch, card2, channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.open_short(Switch, card1, shorts)
time.sleep(.2)
lake = vf.getLake()
T_values =[]
R_values =[]
# current point array
current_x = []
current_y = []
stillrunning = True
offset = float(vf.read_voltage_fast(Voltmeter, VDwellTime))
vf.set_current_fast_yoko(CurrentSource,currentlevel) #Set the current source to one constant value initially
print("Temperature sweep up on channels %d and %d"%(channel1,channel2))
#manual control
while stillrunning:
try:
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
R = (float(V)-offset)/float(currentlevel)
T = vf.getTempK(lake)
R_values.append(R)
T_values.append(T)
current_x.append(T)
current_y.append(R)
#empty=False
curve.setData(T_values,R_values,symbol='o',symbolBrush='w',symbolSize=5)
current_point.setData(current_x, current_y, symbol='o', symbolBrush='r', symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go == 0: #Asynchronous safe exit
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
vf.closeLake(lake)
Tc=findTc(R_values,T_values)
return R_values,T_values,Tc
stillrunning=False
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
stillrunning=False
#Put the voltmeter, switch matrix, and current source back in safe configurations
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, shorts)
time.sleep(.2)
if channel1 != 10:
vf.open_channel(Switch,card1,channel1)
vf.open_channel(Switch,card2,channel2)
vf.closeLake(lake)
Tc=findTc(R_values,T_values)
return R_values,T_values,Tc
def turn_current_off():
CurrentSource = vf.get_current()
vf.set_current_fast_yoko(CurrentSource, 0)
def sweep_current_live(app, curve, current_point, number_of_sweeps, I_min, I_max, step, card1, card2, channel1, channel2,extra_res=0):
"""
Inputs:
:param app, curve: (both pyqtgraph constructs)
:param current_point: pyqtgraph contruct used to plot current point
:param number_of_sweeps: number of sweeps to complete
:param I_min: current sweep start
:param I_maxcurrent: sweep stop
:param step: increment
:param card1, card2: Target Cards 1 and 2
:param channel1,channel 2: Target Channels
:return: I,V,R arrays
:Graphs: Updates a live plot with current on x axis, voltage on y axis
Called By:
-Measure_Resistance
-Automate_channel_IV_live
Calls On:
All Visa Functions
"""
# current initialization variables
# lower range has less noise
Irange = 1e-02
compliance_voltage = 2.
# get GPIB instruments
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
Switch = vf.get_switch()
# Initialize the switch matrix
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1, channel1) # instead of card, used to be 1
time.sleep(0.2)
vf.close_channel(Switch, card2, channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.open_short(Switch, card1, shorts)
time.sleep(.2)
# Going to use lists to start with for flexibility, even though slower than arrays
I_values = []
V_values = []
R_values = []
# current point array
current_x = []
current_y = []
# voltmeter reads non zero when the current is zero
offset = vf.read_voltage_fast(Voltmeter, VDwellTime)
print('Offset: %s' %offset)
global go
go = 1
#Sweep Current up
for n in range(0, number_of_sweeps):
print('\nChannel %d:%d SweepUp Current:'%(channel1,channel2))
for I in np.arange(I_min, I_max, step):
try:
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
V=V-extra_res*I
I_values.append(I)
# For fixing the offset
V_values.append(V-offset)
# put current point in an array to plot in a different color
current_x.append(I)
current_y.append(V-offset)
#R_Offset accounts for the addition of series resistors to select devices
r_offset=0
#Dev_Resistors- Dictionary- key:device with resistor, value-resitance
#Dev_resistors={}
#check for devices with resistors
#if device in Dev_resistors:
# r_offset = Dev-resistors[device]
#else:
# r_offset=0
if I != 0:
R_values.append(float(V)/float(I)-r_offset)
else:
R_values.append(0.0)
# live plotting
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
current_point.setData(current_x, current_y, symbol='o', symbolBrush='r', symbolSize=7)
app.processEvents()
# empty the current point array
current_x = []
current_y = []
# input from GUI
if go == 0:
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
# print('%e '%I,end=" ")
# handle keyboard event
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
#Sweep Current down
print('\nChannel %d:%d SweepDown Current:'%(channel1,channel2))
for I in np.arange(I_max-step, I_min, -step):
try:
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
V=V-extra_res*I
I_values.append(I)
V_values.append(V-offset)
current_x.append(I)
current_y.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
current_point.setData(current_x, current_y, symbol='o', symbolBrush='r', symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go ==0:
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
# print('%e'%I,end=" ")
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
# clear out the different colored current point
current_point.setData([],[])
# turn it off and be ready to switch channels
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, shorts)
time.sleep(.2)
# open channels that were just measured
# 10 is always sort, is this necessary
if channel1 != 10:
vf.open_channel(Switch,card1,channel1)
vf.open_channel(Switch,card2,channel2)
return I_values, V_values, R_values
def constantruntemp(app,curve1,curve2,card1,card2,channel1,channel2,target,tempSetpoint,PID,manual):
'''
Inputs:
:param app, curve: (both pyqtgraph constructs)
:param current_point: pyqtgraph contruct used to plot current point
:param card1, card2: Target Cards 1 and 2
:param channel1,channel 2: Target Channels
:Graphs: Updates a live plot with current on x axis, voltage on y axis
'''
global go
go = 1
currentlevel=1e-4
Irange = 1e-02
compliance_voltage = 2.
#Initialize all hardware
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
Switch = vf.get_switch()
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1, channel1) # instead of card, used to be 1
time.sleep(0.2)
vf.close_channel(Switch, card2, channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.open_short(Switch, card1, shorts)
time.sleep(.2)
#Initialize temperature controller
lake=vf.getLake()
vf.setManualOutput(lake,manual)
vf.setTempSetpoint(lake,tempSetpoint)
vf.setPID(lake,float(PID[0]), float(PID[1]), float(PID[2]))
timevals=[]
R_values = []
T_values = []
# voltmeter reads non zero when the current is zero
#offset = vf.read_voltage_fast(Voltmeter, VDwellTime)
stillrunning=True
passage=0
count=0
#testing=True
start_time=time.time()
vf.set_current_fast_yoko(CurrentSource,currentlevel) #Set the current initially
while stillrunning: # and abs(T_values[-1] - float(target)) > 0.5:
try:
count = count + 1
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
#if count % 10 == 5:
# print(V)
T = vf.getTempK(lake)
#r_offset=0
passage=time.time()-start_time
if currentlevel != 0:
R_values.append(float(V)/float(currentlevel))#-r_offset)
timevals.append(passage)
T_values.append(T)
else:
R_values.append(0.0)
timevals.append(passage)
T_values.append(T)
# if len(R_values)%10==0:
# print("Time is %f, Resistance is %f" %(timevals[-1],R_values[-1]))
curve1.setData(timevals,R_values, symbol='o', symbolBrush='w', symbolSize=5)
curve2.setData(timevals,T_values, symbol='o', symbolBrush='g', symbolSize=5)
app.processEvents()
if go == 0:
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
vf.safe_temp_controller(lake)
stillrunning=False
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
vf.safe_temp_controller(lake)
stillrunning=False
#Put the current/voltage sources in a safe configuration
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, shorts)
time.sleep(.2)
if channel1 != 10:
vf.open_channel(Switch,card1,channel1)
vf.open_channel(Switch,card2,channel2)
vf.safe_temp_controller(lake)
return R_values, T_values
def constantrun(app,curve,card1,card2,channel1,channel2):
'''
Inputs:
:param app, curve: (both pyqtgraph constructs)
:param current_point: pyqtgraph contruct used to plot current point
:param card1, card2: Target Cards 1 and 2
:param channel1,channel 2: Target Channels
:Graphs: Updates a live plot with current on x axis, voltage on y axis
'''
global go
go = 1
currentlevel=1e-3
Irange = 1e-02
compliance_voltage = 2.
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
Switch = vf.get_switch()
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1, channel1) # instead of card, used to be 1
time.sleep(0.2)
vf.close_channel(Switch, card2, channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.open_short(Switch, card1, shorts)
time.sleep(.2)
# Going to use lists to start with for flexibility, even though slower than arrays
timevals=[0]
R_values = [0]
# current point array
# voltmeter reads non zero when the current is zero
offset = vf.read_voltage_fast(Voltmeter, VDwellTime)
print('Offset: %s' %offset)
stillrunning=True
passage=0
count=0
testing=True
start_time=time.time()
while stillrunning and passage<600:
#print('\nChannel %d:%d Constant Current:'%(channel1,channel2))
try:
# current=currentlevel+np.random.normal(0,1e-3)
current=currentlevel
vf.set_current_fast_yoko(CurrentSource,current)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
r_offset=0
passage=time.time()-start_time
if testing:
count+=1
if count%10==0:
print(passage)
if current != 0:
R_values.append(float(V)/float(current)-r_offset)
timevals.append(passage)
else:
R_values.append(0.0)
timevals.append(passage)
# if len(R_values)%10==0:
# print("Time is %f, Resistance is %f" %(timevals[-1],R_values[-1]))
curve.setData(timevals,R_values, symbol='o', symbolBrush='w', symbolSize=5)
app.processEvents()
if go == 0:
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
stillrunning=False
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
stillrunning=False
# turn it off and be ready to switch channels
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, shorts)
time.sleep(.2)
# open channels that were just measured
# 10 is always sort, is this necessary
if channel1 != 10:
vf.open_channel(Switch,card1,channel1)
vf.open_channel(Switch,card2,channel2)
def sweep_current_live_GUI(app,plot, curves, number_of_sweeps, I_min, I_max, step, card1, card2, channel1, channel2,save,chip,device):
"""
Automates the sweep_current_live function for the older GUI
:param app, curve: (both pyqtgraph constructs)
:param number_of_sweeps: number of sweeps to complete
:param I_min, I_max: Respective max and min current values
:param step: step size
:param card1, card2: Target Cards 1 and 2
:param channel1, channel2: Target Channels 1 and 2
:return: I,V,R arrays
:Graphs: Updates a live plot with current on x axis, voltage on y axis
Called By:
-Get Rn Imax
-Get Rn Imax and save
Calls On:
-sweep_current_live_variable_points
-sweep_current_live
"""
# current initialization variables
# lower range has less noise
Irange = 1.3e-01
compliance_voltage = 10.
# get GPIB instruments
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
Switch = vf.get_switch()
# different init. for squids vs. pcm
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1,channel1) # instead of card, used to be 1
time.sleep(0.2)
vf.close_channel(Switch,card2,channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.open_short(Switch, card1, shorts)
time.sleep(.2)
#Going to use lists to start with for flexibility, even though slower than arrays
# starting 7/24: voltmeter reads non zero when the current is zero
offset = vf.read_voltage_fast(Voltmeter, VDwellTime)
print('Offset: %s' %offset)
global go
go = 1
#Sweep Current up
for n in range(0, number_of_sweeps):
I_values = []
V_values = []
R_values = []
if n%2==0:
color = 'w'
else:
color = 'b'
if n>1:
curves[n-2].setData([],[])
print('\nChannel %d:%d SweepUp Current:'%(channel1,channel2))
for I in np.arange(I_min, I_max, step):
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
# new, for fixing the offset 7/24:
V_values.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curves[n].setData(I_values,V_values, symbol='o', pen = color,symbolBrush=color, symbolSize=7)
app.processEvents()
if go == 0:
break
print('%e '%I,end=" ")
#Sweep Current down
print('\nChannel %d:%d SweepDown Current:'%(channel1,channel2))
for I in np.arange(I_max-step, I_min, -step):
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
V_values.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curves[n].setData(I_values,V_values, symbol='o', pen=color,symbolBrush=color, symbolSize=7)
app.processEvents()
if go ==0:
break
print('%e'%I,end=" ")
vf.set_current_fast_yoko(CurrentSource, 0)
time.sleep(.2)
vf.close_short(Switch, card1, shorts)
time.sleep(.2)
vf.open_channel(Switch,card1,channel1)
vf.open_channel(Switch,card1,channel2)
if save:
current_time = time.strftime("_%Y-%m-%d_%H-%M-%S_IVGUI")
dirname = ("E:/Users/volt.686QVACTEST/National Institute of Standards and Technology (NIST)/SEG - SFQ_Circuits/")
import measure_Ic as ic
folder = dirname+ str(chip.name)+current_time
name=ic.create_name(chip.name,device)
filename=folder+name
ic.create_dir(filename)
print(filename)
save_data_live(I_values, V_values, R_values,(folder+name+"_sweep.dat"))
from pyqtgraph import exporters
exporter = exporters.ImageExporter(plot.scene())
try:
exporter.export(filename+"_sweep.png") # export the graph
except:
print("Oh no wrapped object was deleted!!!!!")
try:
return I_values, V_values, R_values
except:
return 0,0,0
def sweep_current_live_variable_points(app, curve, current_point, number_of_sweeps, I_min, I_max, step, card1, card2, channel1, channel2, optionalic=0,extra_res=0):
"""
This plot will be very dense in points around the estimated ic
:param app, curve: (both pyqtgraph constructs)
:param number_of_sweeps: number of sweeps to complete
:param current_point: pyqtgraph contruct used to plot current point
:param I_min: current sweep start
:param I_maxcurrent: sweep stop
:param step: increment
:param card1, card2: Target Cards
:param channel1, channel2: Target Channels
:param dev: Target device
:return: I,V,R arrays
:Graphs: Updates a live plot with current on x axis, voltage on y axis
Called By:
-Get Rn Imax
-Get Rn Imax and save
Calls On:
All Visa Functions
"""
# current initialization variables
# lower range has less noise
Irange = 1e-03
compliance_voltage = 2.
# get GPIB instruments
Voltmeter = vf.get_voltage()
CurrentSource = vf.get_current()
Switch = vf.get_switch()
vf.intialize_switch_all(Switch)
vf.intialize_current_yoko(CurrentSource, Irange, compliance_voltage)
time.sleep(0.2)
vf.intialize_voltage(Voltmeter, nplc, Vrange)
vf.close_channel(Switch, card1,channel1) # instead of card, used to be 1
time.sleep(0.2)
vf.close_channel(Switch,card2,channel2) # instead of card, used to be 1
time.sleep(0.2)
vf.turnon_current_yoko(CurrentSource)
time.sleep(0.2)
vf.open_short(Switch, card1, shorts)
time.sleep(.2)
#Going to use lists to start with for flexibility, even though slower than arrays
I_values = []
V_values = []
R_values = []
# array to hold current point
current_x = []
current_y = []
# offset
offset = vf.read_voltage_fast(Voltmeter, VDwellTime)
global go
go = 1
if optionalic !=0:
estimated_Ic = optionalic
else:
# ** location for hard-coded estimated Ic **
estimated_Ic = 200e-6
# set up the ranges
range1 = estimated_Ic * 0.8
range2 = estimated_Ic * 1.2
range3 = estimated_Ic * 3.7
# different density of points
step_less_points = (range1)/50
step_alot_points = (range2-range1)/400
# start with lower density points
for I in np.arange(0, range1, step_less_points):
try:
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
V=V-extra_res*I
I_values.append(I)
# for fixing the offset
V_values.append(V-offset)
# current point
current_x.append(I)
current_y.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
current_point.setData(current_x, current_y, symbol='o', symbolBrush ='r', symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go == 0:
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
# step with alot of points
for I in np.arange(range1, range2, step_alot_points):
try:
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
# for fixing the offset
V_values.append(V-offset)
# current point
current_x.append(I)
current_y.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
current_point.setData(current_x, current_y, symbol='o', symbolBrush='r', symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go == 0:
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
# Less points for rest of sweep
for I in np.arange(range2, range3, step_less_points):
try:
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
# for fixing the offset:
V_values.append(V-offset)
current_x.append(I)
current_y.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
current_point.setData(current_x, current_y, symbol='o', symbolBrush='r', symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go == 0:
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
#Sweep Current down less points
for I in np.arange(range3-step_less_points, range2, -step_less_points):
try:
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
V_values.append(V-offset)
current_x.append(I)
current_y.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
current_point.setData(current_x, current_y, symbol='o', symbolBrush='r', symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go ==0:
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
# Sweep down with alot of points around the estimated Ic
for I in np.arange(range2-step_alot_points, range1, -step_alot_points):
try:
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
V_values.append(V-offset)
current_x.append(I)
current_y.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
current_point.setData(current_x, current_y, symbol='o', symbolBrush='r', symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go ==0:
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
# final sweep with less points
for I in np.arange(range1-step_less_points, 0, -step_less_points):
try:
vf.set_current_fast_yoko(CurrentSource, I)
V = vf.read_voltage_fast(Voltmeter, VDwellTime)
I_values.append(I)
V_values.append(V-offset)
current_x.append(I)
current_y.append(V-offset)
if I != 0:
R_values.append(float(V)/float(I))
else:
R_values.append(0.0)
# live plotting
curve.setData(I_values,V_values, symbol='o', symbolBrush='w', symbolSize=5)
current_point.setData(current_x, current_y, symbol='o', symbolBrush='r', symbolSize=7)
app.processEvents()
current_x = []
current_y = []
if go ==0:
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
except KeyboardInterrupt:
print("\nExiting...\n")
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return 0,0,0
# turn it all off, ready for next
exitfunc(Switch, CurrentSource, card1, card2, channel1, channel2)
return I_values, V_values, R_values