def discharge_cap():
global channel
setU(channel, 0.0)
setI(channel, 0.1) # Must be >= 10mA otherwise Downprogrammer is off.
scpi("DISP:WINDOW:TEXT \"Discharging...\"")
scpi("OUTP 1")
sleep_ms(1000)
while getU(channel) > 0.5:
sleep_ms(100)
scpi("DISP:WINDOW:TEXT:CLEAR")
setI(channel, 0.1)
scpi("OUTP 0")
def discharge_cap():
global channel
setU(channel, 0.0)
setI(channel, 0.1) # Must be >= 10mA otherwise Downprogrammer is off.
ovp = scpi("SOUR1:VOLT:PROT:STAT?")
if ovp:
scpi("SOUR1:VOLT:PROT:STAT OFF")
scpi("DISP:WINDOW:TEXT \"Discharging...\"")
scpi("OUTP 1")
sleep_ms(1000)
while getU(channel) > 0.5:
sleep_ms(100)
scpi("DISP:WINDOW:TEXT:CLEAR")
setI(channel, 0.1)
scpi("OUTP 0")
if ovp:
scpi("SOUR1:VOLT:PROT:STAT ON")
def start_BJT(cgnd):
global deviceName, Uce_max, Ic_max
TIME_ON_MS = 30
TIME_OFF_MS = 0
# Ch1 B-E
Ib = [50e-6, 100e-6, 150e-6, 200e-6, 250e-6, 300e-6, 350e-6, 400e-6]
Ube = 10.0
# Ch2 C-E
Uce_min = 0.1
NUM_U_DS_STEPS = 400
Uce_step = Uce_max / NUM_U_DS_STEPS
if cgnd:
scpi("INST:COUP:TRAC CGND")
scpi("INST ch1")
scpi("OUTP 0")
scpi("VOLT " + str(Ube))
scpi("CURR 0")
scpi("OUTP:DPR 1")
scpi("SENS:CURR:RANG 50mA")
scpi("INST ch2")
scpi("OUTP 0")
scpi("VOLT 0")
scpi("CURR " + str(Ic_max))
scpi("SENS:CURR:RANG DEFault")
scpi('SENS:DLOG:TRAC:COMMent "Device name = ' + deviceName +
'; Uce,max = ' + str(Uce_max) + '; Ic,max = ' + str(Ic_max) + '"')
scpi("SENS:DLOG:TRAC:X:UNIT VOLT")
scpi("SENS:DLOG:TRAC:X:RANG:MIN " + str(Uce_min))
scpi("SENS:DLOG:TRAC:X:RANG:MAX " + str(Uce_max))
scpi("SENS:DLOG:TRAC:X:STEP " + str(Uce_step))
scpi("SENS:DLOG:TRAC:X:SCALE LIN")
scpi('SENS:DLOG:TRAC:X:LABel "Uce"')
num_ib_steps = len(Ib)
scpi("SENS:DLOG:TRAC:Y:UNIT AMPER")
scpi("SENS:DLOG:TRAC:Y:RANG:MIN 0")
scpi("SENS:DLOG:TRAC:Y:RANG:MAX " + str(Ic_max * 1.1))
scpi('SENS:DLOG:TRAC:Y:LABel "Ic"')
for ib_step_counter in range(num_ib_steps):
scpi('SENS:DLOG:TRAC:Y' + str(ib_step_counter + 1) + ':LABel "Ib=' +
str(Ib[ib_step_counter] * 1E6) + 'uA"')
scpi('INIT:DLOG:TRACE "/Recordings/' + deviceName + '.dlog"')
scpi("INST ch1")
scpi("OUTP 1")
scpi("INST ch2")
scpi("OUTP 1")
scpi("DISP:WINDOW:DLOG")
iMonValues = [0.0] * num_ib_steps
t = ticks_ms()
for uce_step_counter in range(NUM_U_DS_STEPS):
Uce = Uce_min + uce_step_counter * Uce_step
setU(2, Uce)
for ib_step_counter in range(num_ib_steps):
setI(1, Ib[ib_step_counter])
t = ticks_add(t, TIME_ON_MS)
sleep_ms(ticks_diff(t, ticks_ms()))
iMonValues[ib_step_counter] = getI(2)
if TIME_OFF_MS > 0:
setI(1, 0)
t = ticks_add(t, TIME_OFF_MS)
sleep_ms(ticks_diff(t, ticks_ms()))
dlogTraceData(iMonValues)
def start(deviceName, Uce_max, Ic_max):
try:
Uce_step = Uce_max / NUM_U_DS_STEPS
scpi("*SAV 10")
scpi("MEM:STAT:FREEze ON")
scpi("INST:COUP:TRAC CGND")
scpi("INST ch1")
scpi("OUTP 0")
scpi("VOLT " + str(Ube))
scpi("CURR 0")
scpi("OUTP:DPR 1")
scpi("SENS:CURR:RANG 50mA")
scpi("INST ch2")
scpi("OUTP 0")
scpi("VOLT 0")
scpi("CURR " + str(Ic_max))
scpi("SENS:CURR:RANG DEFault")
scpi('SENS:DLOG:TRAC:COMMent "Device name = ' + deviceName + '; Uce,max = ' + str(Uce_max) + '; Ic,max = ' + str(Ic_max) + '"')
scpi("SENS:DLOG:TRAC:X:UNIT VOLT")
scpi("SENS:DLOG:TRAC:X:RANG:MIN " + str(Uce_min))
scpi("SENS:DLOG:TRAC:X:RANG:MAX " + str(Uce_max))
scpi("SENS:DLOG:TRAC:X:STEP " + str(Uce_step))
scpi("SENS:DLOG:TRAC:X:SCALE LIN")
scpi('SENS:DLOG:TRAC:X:LABel "Uce"')
num_ib_steps = len(Ib)
scpi("SENS:DLOG:TRAC:Y:UNIT AMPER")
scpi("SENS:DLOG:TRAC:Y:RANG:MIN 0")
scpi("SENS:DLOG:TRAC:Y:RANG:MAX " + str(Ic_max * 1.1))
scpi('SENS:DLOG:TRAC:Y:LABel "Ic"')
for ib_step_counter in range(num_ib_steps):
scpi('SENS:DLOG:TRAC:Y' + str(ib_step_counter+1) + ':LABel "Ib=' + str(Ib[ib_step_counter] * 1E6) + 'uA"')
scpi('INIT:DLOG:TRACE "/Recordings/' + deviceName + '.dlog"')
scpi("INST ch1")
scpi("OUTP 1")
scpi("INST ch2")
scpi("OUTP 1")
scpi("DISP:WINDOW:DLOG")
iMonValues = [0.0] * num_ib_steps
t = ticks_ms()
for uce_step_counter in range(NUM_U_DS_STEPS):
Uce = Uce_min + uce_step_counter * Uce_step
setU(2, Uce)
for ib_step_counter in range(num_ib_steps):
setI(1, Ib[ib_step_counter])
t = ticks_add(t, TIME_ON_MS)
sleep_ms(ticks_diff(t, ticks_ms()))
iMonValues[ib_step_counter] = getI(2)
if TIME_OFF_MS > 0:
setI(1, 0)
t = ticks_add(t, TIME_OFF_MS)
sleep_ms(ticks_diff(t, ticks_ms()))
dlogTraceData(iMonValues)
finally:
scpi("ABOR:DLOG")
scpi("*RCL 10")
scpi("MEM:STAT:FREEze OFF")