I'm trying to run transistor IV measurement, especially Vg sweep. I've been successful in programming other equipments such as Agilent 4156c, Keithley 2400 sourcemeter, etc, so now I'm trying to program Agilent B1500A.
I connected my laptop with B1500A using GPIB-USB-HS, and I installed all drivers needed. I confirmed that B1500 responsed IDN command using NI-VISA Test Panel.
Moreover, I found this website that could help me program B1500A with python in my laptop.
https://pymeasure.readthedocs.io/en/latest/api/instruments/agilent/agilentB1500.html#pymeasure.instruments.agilent.agilentB1500.AgilentB1500.meas_mode
According to this website, I used the code as below and finally I tried to run this, and the error 'VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed.' occured in ''# set data output format (required!)
b1500.data_format(21, mode=1) #call after SMUs are initialized to get names for the channels''.
However, even without the line above,
''# choose measurement mode
b1500.meas_mode('STAIRCASE_SWEEP', *b1500.smu_references) #order in smu_references determines order of measurement'' also results the same error.
This error might caused by the former line, and does anybody know the solutions for this?
I'd really appreciate it if anybody could help me.
Thank you.
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import pyvisa
import matplotlib.pyplot as plt
from pymeasure.instruments.agilent import AgilentB1500
# Define your instrument's VISA resource string
instrument_visa_address = "GPIB0::17::INSTR"
# Initialize PyVISA resource manager
rm = pyvisa.ResourceManager()
# Open a connection to the instrument
try:
instrument = rm.open_resource(instrument_visa_address, timeout=100000)
print(f"Connected to instrument: {instrument.query('*IDN?')}")
except pyvisa.VisaIOError as e:
print(f"Failed to connect to instrument: {e}")
exit()
# Initialize Agilent B1500A instrument
b1500 = AgilentB1500(instrument)
# explicitly define r/w terminations; set sufficiently large timeout in milliseconds or None.
b1500=AgilentB1500(instrument_visa_address)
# query SMU config from instrument and initialize all SMU instances
b1500.initialize_all_smus()
# set data output format (required!)
b1500.data_format(21, mode=1) #call after SMUs are initialized to get names for the channels
# choose measurement mode
b1500.meas_mode('STAIRCASE_SWEEP', *b1500.smu_references) #order in smu_references determines order of measurement
# settings for individual SMUs
for smu in b1500.smu_references:
smu.enable() #enable SMU
smu.adc_type = 'HRADC' #set ADC to high-resoultion ADC
smu.meas_range_current = '10uA'
smu.meas_op_mode = 'COMPLIANCE_SIDE' # other choices: Current, Voltage, FORCE_SIDE, COMPLIANCE_AND_FORCE_SIDE
# General Instrument Settings
# b1500.adc_averaging = 1
# b1500.adc_auto_zero = True
b1500.adc_setup('HRADC','AUTO',6)
#b1500.adc_setup('HRADC','PLC',1)
#Sweep Settings
b1500.sweep_timing(0,5,step_delay=0.1) #hold,delay
b1500.sweep_auto_abort(False,post='STOP') #disable auto abort, set post measurement output condition to stop value of sweep
# Sweep Source
nop = 11
Vg_start = -0.5
Vg_stop = 2.0
Vg_steps = 20
Vds_values = [0.0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0]
Vg_values = []
Ids_values = []
for Vg in np.linspace(Vg_start, Vg_stop, Vg_steps):
b1500.smu3.ramp_source('VOLTAGE','Auto Ranging',Vg, stepsize=0.1, pause=20e-3)
#type, mode, range, start, stop, steps, compliance
for Vds in Vds_values:
b1500.smu4.ramp_source('VOLTAGE','Auto Ranging',Vds, stepsize=0.1, pause=20e-3) #type, mode, range, start, stop, steps, compliance
#Start Measurement
b1500.check_errors()
b1500.clear_buffer()
b1500.clear_timer()
b1500.send_trigger()
# read measurement data all at once
b1500.check_idle() #wait until measurement is finished
data = b1500.read_data(2*nop) #Factor 2 because of double sweep
# Append gate voltage and drain current values to lists
Vg_values.append(Vg)
Ids_values.append(data[0][3])
# Plot Vg-Ids graph
plt.figure(figsize=(8, 6))
plt.plot(Vg_values, Ids_values, marker='o', linestyle='-')
plt.xlabel('Gate Voltage (V)')
plt.ylabel('Drain Current (A)')
plt.title('Vg-Ids Characteristics')
plt.grid(True)
plt.show()
'''
#alternatively: read measurement data live
meas = []
for i in range(nop*2):
read_data = b1500.read_channels(4+1) # 4 measurement channels, 1 sweep source (returned due to mode=1 of data_format)
# process live data for plotting etc.
# data format for every channel (status code, channel name e.g. 'SMU1', data name e.g 'Current Measurement (A)', value)
meas.append(read_data)
'''
#sweep constant sources back to 0V
b1500.smu3.ramp_source('VOLTAGE','Auto Ranging',0,stepsize=0.1,pause=20e-3)
b1500.smu4.ramp_source('VOLTAGE','Auto Ranging',0,stepsize=0.1,pause=20e-3)
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Hello,
Do you find a solution?
I am trying also to program B1505A using python, and I can't find ressources for it.
Thanks