def iDeviceCurve(vi1,vi2,vii,vo1,vo2,voi=0.1,ri=1.0,ro=1.0,wt=0.1):
# Check if SciPy is loaded
slab.checkSciPy()
i_range=np.arange(vi1,vi2,vii)
o_range=np.arange(vo1,vo2,voi)
plt.figure(facecolor="white") # White border
for vi in i_range:
avo = []
aio = []
slab.setVoltage(2,vi)
slab.wait(wt)
a0 = slab.readVoltage(1)
i_in = (vi - a0) / ri
for vs in o_range:
slab.setVoltage(1,vs)
slab.wait(wt)
a1 = slab.readVoltage(2)
a2 = slab.readVoltage(3)
curr = (a1 - a2) / ro
avo.append(a2)
aio.append(curr)
lbl = "{:.6f}".format(i_in) + ' mA'
pl.plot(avo,aio,label=lbl)
slab.message(1,"Drawing curves")
pl.legend(loc='upper right')
pl.title("Io(Vo) Device Curves as function of Ii")
pl.xlabel("Output Voltage(V)")
pl.ylabel("Output Current(mA)")
pl.grid()
pl.show()
pl.close()
def curveVVbridge(vp,vn,vi=0.1,vmin=0.0,wt=0.1,returnData=False):
# Check if SciPy is loaded
slab.checkSciPy()
# Perform the positive DC sweep
slab.message(1,"Positive curve")
slab.setVoltage(2,vmin)
xp,y1p,y2p,y3p,y4p = slab.dcSweep(1,vmin,vp,vi,wt)
# Perform the negative DC sweep
slab.message(1,"Negative curve")
slab.setVoltage(1,vmin)
xn,y1n,y2n,y3n,y4n = slab.dcSweep(2,vmin,vn,vi,wt)
# Join all measurements
x=[]
y=[]
ln = len(xn)
for i in range(0,ln):
pos = ln-i-1
xvalue = y1n[pos]-y2n[pos]
yvalue = y3n[pos]-y4n[pos]
x.append(xvalue)
y.append(yvalue)
lp = len(xp)
for i in range(0,lp):
xvalue = y1p[i]-y2p[i]
yvalue = y3p[i]-y4p[i]
x.append(xvalue)
y.append(yvalue)
x = np.array(x)
y = np.array(y)
# Plot result
slab.message(1,"Drawing curve")
slab.plot11(x,y,"V(V) Bridge Plot","Input (V)","Output (V)")
if slab.plotReturnData or returnData:
return x,y
def curveVIref(v1,v2,vi=0.1,r=1.0,vr=-1,wt=0.1,returnData=False):
# Check if SciPy is loaded
slab.checkSciPy()
# Perform a DC sweep
x,y1,y2,y3,y4 = slab.dcSweep(1,v1,v2,vi,wt)
# Set DAC 1 to Vdd/2
slab.setVoltage(1,slab.vdd/2)
# Plot result
req = r / 2
if vr < 0:
vr = slab.vdd / 2
vd = y1 - y2
id = (y2 - vr)/req
slab.message(1,"Drawing curve")
slab.plot11(vd,id,"V-I plot with reference","Voltage (V)","Current (mA)")
if slab.plotReturnData or returnData:
return vd,id
def curveVIbridgeOld(v1max,v2max,vi=0.1,r=1.0,wt=0.1,returnData=False):
# Check if SciPy is loaded
slab.checkSciPy()
# Perform first DC sweep
slab.message(1,"Forward curve")
slab.setVoltage(2,0.0) # Set DAC 2 to 0.0
x,y1,y2,y3,y4 = slab.dcSweep(1,0.0,v1max,vi,wt) # Sweep DAC 1
# First plot
vd = y2 - y3
id = (y1 - y2)/r
plt.figure(facecolor="white") # White border
pl.plot(vd,id)
# Perform second DC sweep
slab.message(1,"Backward curve")
slab.setVoltage(1,0.0) # Set DAC 1 to 0.0
x,y1,y2,y3,y4 = slab.dcSweep(2,0.0,v2max,vi,wt) # Sweep DAC 2
# Set DACs to zero
slab.writeChannel(1,0.0)
slab.writeChannel(2,0.0)
# Second plot
slab.message(1,"Drawing curve")
vd = y2 - y3
id = (y1 - y2)/r
pl.plot(vd,id)
pl.xlabel("Voltage (V)")
pl.ylabel("Current (mA)")
pl.title("V-I plot in bridge mode")
pl.grid()
pl.show()
pl.close()
if slab.plotReturnData or returnData:
return vd,id
def curveVIbridge(v1max,v2max,vi=0.1,vmin=0.0,r=1.0,wt=0.1,returnData=False):
# Check if SciPy is loaded
slab.checkSciPy()
# Perform first DC sweep
slab.message(1,"Positive curve")
slab.setVoltage(2,vmin) # Set DAC 2 to vmin
xf,y1f,y2f,y3f,y4f = slab.dcSweep(1,vmin,v1max,vi,wt) # Sweep DAC 1
# Perform second DC sweep
slab.message(1,"Negative curve")
slab.setVoltage(1,vmin) # Set DAC 1 to vmin
xr,y1r,y2r,y3r,y4r = slab.dcSweep(2,vmin,v2max,vi,wt) # Sweep DAC 2
# Set DACs to vmin
slab.setVoltage(1,vmin)
slab.setVoltage(2,vmin)
# Join the curves
vd=[]
id=[]
lenr=len(xr)
for i in range(0,lenr):
pos = lenr - i - 1
vd.append(y2r[pos]-y3r[pos])
id.append((y1r[pos]-y2r[pos])/r)
for i in range(0,len(xf)):
vd.append(y2f[i]-y3f[i])
id.append((y1f[i]-y2f[i])/r)
plt.figure(facecolor="white") # White border
pl.plot(vd,id)
pl.xlabel("Voltage (V)")
pl.ylabel("Current (mA)")
pl.title("V-I plot in bridge mode")
pl.grid()
pl.show()
pl.close()
if slab.plotReturnData or returnData:
return vd,id
print('If you had performed the calibration, it should load')
if pause_after_connect:
slab.pause('(Press return)')
print()
slab.printBoardInfo()
print()
print('You should see information about the board')
print('Now connect DAC1 to ADC1,3,4 and DAC2 to ADC2')
if pause_after_info:
slab.pause('(Press return)')
print()
#DC voltage commands
print('DC voltage commands')
slab.setVoltage(1,1.5)
slab.setVoltage(2,2.0)
v1=slab.readVoltage(1)
v2=slab.readVoltage(2)
v3=slab.readVoltage(3)
v4=slab.readVoltage(4)
if not( compare(v1,1.5) and compare(v2,2.0) and compare(v3,1.5) and compare(v4,1.5)):
raise slab.SlabEx("setVoltage or readVoltage fail")
print(' setVoltage and readVoltage pass')
slab.zero()
if not zeroCompare(slab.readVoltage(1),0.05):
raise slab.SlabEx("zero command fails")
print(' zero pass')
print()
slab.setVoltage(1,1.0)
pl.plot(xrange,a4,label="ADC4(DAC1)")
pl.legend(loc='lower right')
pl.title("ADC(DAC) Test Curves")
pl.xlabel("DAC Ratiometric value")
pl.ylabel("ADC Ratiometric value")
pl.grid()
pl.show()
sl.setSampleTime(0.002)
print "Sample time set to 2ms"
sl.setTransientStorage(200,1)
print "Transient storage set to 200 points"
sl.setVoltage(1,1.0)
print
print "[ ] Commands R, S and Y checked in next curve if:"
print " Voltage is about 1V"
print " Maximum time is 0.4s"
print " Resolution is 2ms"
print
sl.tranAsyncPlot()
print "For the next test you need to take and put ADC1 cable"
print "during the transient triggered test"
print "Sometimes you should connect it to GND and Vdd in sequence"
print "After the curve is drawn, reconnect ADC1 to DAC1"
print
def setVoltage(channel, value):
slab.setVoltage(channel, value)