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multiple-pulse capability enabled #86

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merged 4 commits into from
Aug 26, 2024
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Merged

multiple-pulse capability enabled #86

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c3b8090
multiple-pulse capability enabled
Code-Craftsman-Christian Aug 6, 2024
16d0beb
Update main.py for seperate DC and PULSE commands + clean-ups
afischer-sweepme Aug 26, 2024
94295b2
Agilent B29xx -> comments reformatted, speed type "Standard" -> "Medium"
afischer-sweepme Aug 26, 2024
a69567b
Agilent B29xx -> Pulse is triggered in phase 'measure', obsolete case…
afischer-sweepme Aug 26, 2024
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60 changes: 48 additions & 12 deletions src/SMU-Agilent_B29xx/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,8 @@

from pysweepme.EmptyDeviceClass import EmptyDevice

import time


class Device(EmptyDevice):

Expand Down Expand Up @@ -84,12 +86,14 @@ def set_GUIparameter(self):
"PulseOnTime": 1e-3, # for use on the B2902B, defined as the pulse width time
"PulseDelay": 0, # for use on the B2902B, defined as the delay time prior to pulse
"PulseOffLevel": 0.0, # bias voltage during pulse-off
"PulseCount": 1, #amount of pulses
# "Average": 1, # not yet supported
}

return gui_parameter

def get_GUIparameter(self, parameter={}):
#print(parameter)

self.four_wire = parameter['4wire']
# self.route_out = parameter['RouteOut']
Expand Down Expand Up @@ -124,10 +128,13 @@ def get_GUIparameter(self, parameter={}):

# bias voltage during pulse-off
self.pulseofflevel = parameter["PulseOffLevel"]

# amount of pulses to be automatically released
self.pulsecount = parameter["PulseCount"]

# pulse delay is part of trigger acquire delay; this equation makes sure than the minimum acquire delay of
# 750us is extended by the amount of pulse delay requested by the user via the GUI
self.acqdelay = str("{:.4E}".format(self.toff + 750e-6))
# 500us is extended by the amount of pulse delay requested by the user via the GUI
self.acqdelay = str("{:.4E}".format(self.toff + 500e-6))

def initialize(self):
# once at the beginning of the measurement
Expand Down Expand Up @@ -155,8 +162,8 @@ def configure(self):
if self.source.startswith("Voltage"):
self.port.write(":SOUR%s:FUNC:MODE VOLT" % self.channel)
# sourcemode = Voltage
self.port.write(":SOUR%s:VOLT:MODE FIX" % self.channel)
# sourcemode fix
self.port.write(":SOUR%s:VOLT:MODE SWE" % self.channel)
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# sourcemode sweepo
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self.port.write(":SENS%s:FUNC \"CURR\"" % self.channel)
# measurement mode
self.port.write(":SENS%s:CURR:PROT %s" % (self.channel, self.protection))
Expand All @@ -170,10 +177,11 @@ def configure(self):
# Autorange for current output

elif self.source.startswith("Current"):

self.port.write(":SOUR%s:FUNC:MODE CURR" % self.channel)
# sourcemode = Voltage
self.port.write(":SOUR%s:CURR:MODE FIX" % self.channel)
# sourcemode fix
self.port.write(":SOUR%s:CURR:MODE SWE" % self.channel)
# sourcemode sweep
self.port.write(":SENS%s:FUNC \"VOLT\"" % self.channel)
# measurement mode
self.port.write(":SENS%s:VOLT:PROT %s" % (self.channel, self.protection))
Expand Down Expand Up @@ -222,11 +230,10 @@ def configure(self):
self.port.write(":FUNC PULS") # switch to pulse output instead of "DC"
self.port.write(":PULS:WIDT %s" % self.ton) # pulse width time
self.port.write(":PULS:DEL %s" % self.toff) # delay prior to pulse
self.port.write(
":SOUR%s:FUNC:TRIG:CONT OFF" % self.channel) # switch off continuous operation of internal trigger
self.port.write(":SOUR%s:SWE:POIN %s" % (self.channel,self.pulsecount)) # setting the amount of pulses by mis-using the sweep function
self.port.write(":SOUR%s:FUNC:TRIG:CONT OFF" % self.channel) # switch off continuous operation of internal trigger
self.port.write(":SOUR%s:WAIT ON" % self.channel) # enables to wait for any change of amplitude past pulse
self.port.write(
":SENS%s:WAIT ON" % self.channel) # enables wait time for start of measurement defined by delay
self.port.write(":SENS%s:WAIT ON" % self.channel) # enables wait time for start of measurement defined by delay
self.port.write(":TRIG%s:TRAN:DEL MIN" % self.channel) # trigger delay hardcoded to 0s

# delay of measurement after pulse release is triggered; takes care of ramp-up
Expand All @@ -235,6 +242,8 @@ def configure(self):
self.port.write(":TRIG%s:ALL:COUN 1" % self.channel) # sets trigger count, 1 for single pulse
self.port.write(":TRIG%s:LXI:LAN:DIS:ALL" % self.channel) # disable LXI triggering
self.port.write(":TRIG%s:ALL:SOUR AINT" % self.channel) # enable internal trigger

self.port.write(":TRIG%s:ALL:COUN %s" % (self.channel, self.pulsecount)) # enables multiple trigger events for the requested amount of pulses

# set trigger daly to minimum; not to be mixed up with pulse delay
self.port.write(":TRIG%s:ALL:TIM MIN" % self.channel)
Expand Down Expand Up @@ -390,16 +399,43 @@ def apply(self):
value = str("{:.4E}".format(self.value)) # makes sure that self.value fits into SCPI command in terms of length
if self.pulse:
# get channel ready at specified values

self.port.write(":SOUR%s:%s %s" % (self.channel, self.commands[self.source], self.pulseofflevel))
# arming the pulse trigger
self.port.write(":SOUR%s:%s:TRIG %s" % (self.channel, self.commands[self.source], value))

# arming the pulse trigger; mis-using the sweep function with identical start and stop values so we can use number-of-pulses functionality
if self.source.startswith("Current"):
self.port.write(":SOUR%s:CURR:STAR %s" % (self.channel, value))
self.port.write(":SOUR%s:CURR:STOP %s" % (self.channel, value))

if self.source.startswith("Voltage"):
self.port.write(":SOUR%s:VOLT:STAR %s" % (self.channel, value))
self.port.write(":SOUR%s:VOLT:STOP %s" % (self.channel, value))

# releasing the pulse trigger
self.port.write(":INIT (@%s)" % self.channel)
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else:
# set output to specified values
self.port.write(":SOUR%s:%s %s" % (self.channel, self.commands[self.source], value))
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def call(self):

if self.pulse:
opcounter = 0 # set counter for operation register request loop back to zero

while True:
self.port.write(":STAT:OPER:COND?") # query SMU for the status of the operation register
opstatus=self.port.read()
print("Operation Status:", opstatus)
if opstatus=="1170": # checks whether transition and aquisition are finished on both channels (INT values 2+16 + 128+1024)
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break
else:
opcounter += 1
time.sleep(0.5)


#if self.pulse:
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# time.sleep(round(self.pulsecount * (0.04 + self.ton + self.toff),1)) # prevents visa timeout as the device won't response during pulse sweep, not even to OPC command. A generous 40ms minimum delay between pulses is assumed.

if self.pulse:
self.port.write(
Expand Down