def start():
if not can_start():
error("Enter diode name")
return
scpi("DISP:DIALog:CLOSe")
uStep = U_step
uBreakdown = None
try:
scpi("*SAV 10")
scpi("MEM:STAT:FREEze ON")
ch1Model = scpi("SYSTem:CHANnel:MODel? ch1")
ch2Model = scpi("SYSTem:CHANnel:MODel? ch2")
if ch1Model.startswith("DCP405") and ch2Model.startswith("DCP405"):
scpi("INST:COUP:TRAC SER")
else:
scpi("INST:COUP:TRAC NONE")
scpi("INST ch1")
uMax = float(scpi("VOLT? MAX"))
scpi("OUTP 0")
scpi("SENS:CURR:RANG MIN")
scpi("VOLT 0")
scpi("CURR " + str(I_SET))
scpi('SENS:DLOG:TRAC:COMMent "Diode name = ' + diode_name +
'; U step = ' + str(U_step) + '"')
scpi("SENS:DLOG:TRAC:X:UNIT VOLT")
scpi("SENS:DLOG:TRAC:X:STEP " + str(U_step))
scpi("SENS:DLOG:TRAC:X:RANG:MAX " + str(uMax))
scpi('SENS:DLOG:TRAC:X:LABel "Uset"')
scpi("SENS:DLOG:TRAC:Y1:UNIT AMPER")
scpi("SENS:DLOG:TRAC:Y1:RANG:MAX " + str(I_SET))
scpi('SENS:DLOG:TRAC:Y1:LABel "Imon"')
scpi('INIT:DLOG:TRACE "/Recordings/' + diode_name + '.dlog"')
scpi("OUTP 1")
scpi("DISP:WINDOW:DLOG")
ch = 1
t = ticks_ms()
i = 0
while True:
uSet = i * U_step
if uSet > uMax:
break
setU(ch, uSet)
#scpi("VOLT " + str(uSet))
t = ticks_add(t, TIME_STEP_MS)
sleep_ms(ticks_diff(t, ticks_ms()))
iMon = getI(ch)
#iMon = scpi("MEAS:CURR?")
dlogTraceData(iMon)
#scpi("DLOG:TRACE:DATA " + scpi("MEAS:CURR?"))
mode = getOutputMode(ch)
#mode = scpi("OUTP:MODE?")
#print(uSet, iMon, mode)
#if mode == "CC":
# break
if iMon >= I_SET:
uBreakdown = uSet
break
i = i + 1
finally:
scpi("ABOR:DLOG")
scpi("*RCL 10")
scpi("MEM:STAT:FREEze OFF")
if uBreakdown != None:
scpi('DISP:INPUT? "Breakdown voltage is ' + str(round(uBreakdown, 2)) +
'V", MENU, BUTTON, "Close"')
else:
scpi(
'DISP:INPUT? "Breakdown voltage not found", MENU, BUTTON, "Close"')
if uSet > uMax:
break
setU(ch, uSet)
#scpi("VOLT " + str(uSet))
t = ticks_add(t, TIME_STEP_MS)
sleep_ms(ticks_diff(t, ticks_ms()))
iMon = getI(ch)
#iMon = scpi("MEAS:CURR?")
dlogTraceData(iMon)
#scpi("DLOG:TRACE:DATA " + scpi("MEAS:CURR?"))
mode = getOutputMode(ch)
#mode = scpi("OUTP:MODE?")
print(uSet, iMon, mode)
#if mode == "CC":
# break
if iMon >= I_SET:
uBreakdown = uSet
break
i = i + 1
finally:
scpi("ABOR:DLOG")
scpi("*RCL 10")
scpi("MEM:STAT:FREEze OFF")