Example notebook for Keithley 6430 SMU

%matplotlib notebook
import matplotlib.pyplot as plt

import qcodes as qc
from qcodes_contrib_drivers.drivers.Tektronix.Keithley_6430 import Keithley_6430

qc.Instrument.close_all()
smu = Keithley_6430("SMU", "Keithley6430")

Connected to: KEITHLEY INSTRUMENTS INC. 6430 (serial:1357727, firmware:C28   Jun 13 2011 12:31:43/A02  /G/B) in 0.14s

smu.print_readable_snapshot(update=True)

SMU:
        parameter                        value
--------------------------------------------------------------------------------
IDN                               :     {'vendor': 'KEITHLEY INSTRUMENTS INC.', '...
arm_count                         :     1
arm_source                        :     IMM
autozero                          :     True
digits                            :     6
filter_auto                       :     True
filter_median                     :     0
filter_median_enabled             :     True
filter_moving                     :     1
filter_moving_enabled             :     True
filter_repeat                     :     1
filter_repeat_enabled             :     True
nplc                              :     10.00
output_auto_off                   :     False
output_on                         :     False
sense_autorange                   :     True
sense_current                     :     None
sense_current_range               :     1.050000E-04
sense_mode                        :     CURR:DC
sense_resistance                  :     None
sense_resistance_ocomp            :     False
sense_resistance_range            :     2.100000E+05
sense_voltage                     :     None
sense_voltage_range               :     21.00
source_current                    :     0.000000E+00
source_current_compliance         :     1.050000E-04
source_current_compliance_tripped :     False
source_current_range              :     1.050000E-04
source_delay                      :     0.00300
source_delay_auto                 :     False
source_mode                       :     VOLT
source_voltage                    :     0.000000E+00
source_voltage_compliance         :     2.100000E+01
source_voltage_compliance_tripped :     False
source_voltage_range              :     21.00
timeout                           :     5 (s)
trigger_count                     :     1
trigger_source                    :     IMM

Measure resistance of a ~100k\(\Omega\) resistor

Source mode can be either "VOLT" for voltage, or "CURR" for current. Sense mode can be any combination of "VOLT:DC", "CURR:DC" and "RES", to measure voltage, current and/or resistance. Source value can be the changed with "source_voltage" or "source_current". Values can be measured with "sense_voltage", "sense_current", and "sense_resistance".

smu.sense_mode('CURR:DC,VOLT:DC,RES') # set to measure current, voltage, and resistance
smu.source_mode('VOLT') # set to source voltage
smu.source_voltage_range(2)
smu.source_current_compliance(1e-3)
smu.output_enabled(True)
v, i, r = [], [], []
for volt in np.linspace(-10, 10, 100): # set voltage, measure all 3
    smu.source_voltage(volt)
    v.append(smu.sense_voltage())
    i.append(smu.sense_current())
    r.append(smu.sense_resistance())

smu.output_enabled(False)

plt.plot(v,i)
meas_r = np.mean(r)
meas2_r = np.mean( (v[0]-v[-1])/(i[0]-i[-1]) ) # lazy ""fit"" to a line
print("Measured by instrument:", meas_r)
print("Estimate from raw values:", meas2_r)

Measured by instrument: 100313.51099999998
Estimate from raw values: 100377.86190725854

smu.output_enabled(False)
smu.close()