Keithley 2400 SourceMeter

class pymeasure.instruments.keithley.Keithley2400(adapter, **kwargs)

Bases: pymeasure.instruments.instrument.Instrument, pymeasure.instruments.keithley.buffer.KeithleyBuffer

Represents the Keithely 2400 SourceMeter and provides a high-level interface for interacting with the instrument.

keithley = Keithley2400("GPIB::1")

keithley.apply_current()                # Sets up to source current
keithley.source_current_range = 10e-3   # Sets the source current range to 10 mA
keithley.compliance_voltage = 10        # Sets the compliance voltage to 10 V
keithley.source_current = 0             # Sets the source current to 0 mA
keithley.enable_source()                # Enables the source output

keithley.measure_voltage()              # Sets up to measure voltage

keithley.ramp_to_current(5e-3)          # Ramps the current to 5 mA
print(keithley.voltage)                 # Prints the voltage in Volts

keithley.shutdown()                     # Ramps the current to 0 mA and disables output
apply_current(current_range=None, compliance_voltage=0.1)

Configures the instrument to apply a source current, and uses an auto range unless a current range is specified. The compliance voltage is also set.

Parameters
  • compliance_voltage – A float in the correct range for a compliance_voltage

  • current_range – A current_range value or None

apply_voltage(voltage_range=None, compliance_current=0.1)

Configures the instrument to apply a source voltage, and uses an auto range unless a voltage range is specified. The compliance current is also set.

Parameters
  • compliance_current – A float in the correct range for a compliance_current

  • voltage_range – A voltage_range value or None

auto_range_source()

Configures the source to use an automatic range.

beep(frequency, duration)

Sounds a system beep.

Parameters
  • frequency – A frequency in Hz between 65 Hz and 2 MHz

  • duration – A time in seconds between 0 and 7.9 seconds

property buffer_data

Returns a numpy array of values from the buffer.

property buffer_points

An integer property that controls the number of buffer points. This does not represent actual points in the buffer, but the configuration value instead.

check_errors()

Logs any system errors reported by the instrument.

property compliance_current

A floating point property that controls the compliance current in Amps.

property compliance_voltage

A floating point property that controls the compliance voltage in Volts.

config_buffer(points=64, delay=0)

Configures the measurement buffer for a number of points, to be taken with a specified delay.

Parameters
  • points – The number of points in the buffer.

  • delay – The delay time in seconds.

property current

Reads the current in Amps, if configured for this reading.

property current_nplc

A floating point property that controls the number of power line cycles (NPLC) for the DC current measurements, which sets the integration period and measurement speed. Takes values from 0.01 to 10, where 0.1, 1, and 10 are Fast, Medium, and Slow respectively.

property current_range

A floating point property that controls the measurement current range in Amps, which can take values between -1.05 and +1.05 A. Auto-range is disabled when this property is set.

disable_buffer()

Disables the connection between measurements and the buffer, but does not abort the measurement process.

disable_output_trigger()

Disables the output trigger for the Trigger layer

disable_source()

Disables the source of current or voltage depending on the configuration of the instrument.

enable_source()

Enables the source of current or voltage depending on the configuration of the instrument.

property error

Returns a tuple of an error code and message from a single error.

property id

Requests and returns the identification of the instrument.

is_buffer_full()

Returns True if the buffer is full of measurements.

property max_current

Returns the maximum current from the buffer

property max_resistance

Returns the maximum resistance from the buffer

property max_voltage

Returns the maximum voltage from the buffer

property maximums

Returns the calculated maximums for voltage, current, and resistance from the buffer data as a list.

property mean_current

Returns the mean current from the buffer

property mean_resistance

Returns the mean resistance from the buffer

property mean_voltage

Returns the mean voltage from the buffer

property means

Reads the calculated means (averages) for voltage, current, and resistance from the buffer data as a list.

measure_current(nplc=1, current=0.000105, auto_range=True)

Configures the measurement of current.

Parameters
  • nplc – Number of power line cycles (NPLC) from 0.01 to 10

  • current – Upper limit of current in Amps, from -1.05 A to 1.05 A

  • auto_range – Enables auto_range if True, else uses the set current

measure_resistance(nplc=1, resistance=210000.0, auto_range=True)

Configures the measurement of resistance.

Parameters
  • nplc – Number of power line cycles (NPLC) from 0.01 to 10

  • resistance – Upper limit of resistance in Ohms, from -210 MOhms to 210 MOhms

  • auto_range – Enables auto_range if True, else uses the set resistance

measure_voltage(nplc=1, voltage=21.0, auto_range=True)

Configures the measurement of voltage.

Parameters
  • nplc – Number of power line cycles (NPLC) from 0.01 to 10

  • voltage – Upper limit of voltage in Volts, from -210 V to 210 V

  • auto_range – Enables auto_range if True, else uses the set voltage

property min_current

Returns the minimum current from the buffer

property min_resistance

Returns the minimum resistance from the buffer

property min_voltage

Returns the minimum voltage from the buffer

property minimums

Returns the calculated minimums for voltage, current, and resistance from the buffer data as a list.

output_trigger_on_external(line=1, after='DEL')

Configures the output trigger on the specified trigger link line number, with the option of supplying the part of the measurement after which the trigger should be generated (default to delay, which is right before the measurement)

Parameters
  • line – A trigger line from 1 to 4

  • after – An event string that determines when to trigger

ramp_to_current(target_current, steps=30, pause=0.02)

Ramps to a target current from the set current value over a certain number of linear steps, each separated by a pause duration.

Parameters
  • target_current – A current in Amps

  • steps – An integer number of steps

  • pause – A pause duration in seconds to wait between steps

ramp_to_voltage(target_voltage, steps=30, pause=0.02)

Ramps to a target voltage from the set voltage value over a certain number of linear steps, each separated by a pause duration.

Parameters
  • target_voltage – A voltage in Amps

  • steps – An integer number of steps

  • pause – A pause duration in seconds to wait between steps

reset()

Resets the instrument and clears the queue.

reset_buffer()

Resets the buffer.

property resistance

Reads the resistance in Ohms, if configured for this reading.

property resistance_nplc

A floating point property that controls the number of power line cycles (NPLC) for the 2-wire resistance measurements, which sets the integration period and measurement speed. Takes values from 0.01 to 10, where 0.1, 1, and 10 are Fast, Medium, and Slow respectively.

property resistance_range

A floating point property that controls the resistance range in Ohms, which can take values from 0 to 210 MOhms. Auto-range is disabled when this property is set.

sample_continuously()

Causes the instrument to continuously read samples and turns off any buffer or output triggering

set_timed_arm(interval)

Sets up the measurement to be taken with the internal trigger at a variable sampling rate defined by the interval in seconds between sampling points

set_trigger_counts(arm, trigger)

Sets the number of counts for both the sweeps (arm) and the points in those sweeps (trigger), where the total number of points can not exceed 2500

shutdown()

Ensures that the current or voltage is turned to zero and disables the output.

property source_current

A floating point property that controls the source current in Amps.

property source_current_range

A floating point property that controls the source current range in Amps, which can take values between -1.05 and +1.05 A. Auto-range is disabled when this property is set.

property source_enabled

A boolean property that controls whether the source is enabled, takes values True or False. The convenience methods enable_source() and disable_source() can also be used.

property source_mode

A string property that controls the source mode, which can take the values ‘current’ or ‘voltage’. The convenience methods apply_current() and apply_voltage() can also be used.

property source_voltage

A floating point property that controls the source voltage in Volts.

property source_voltage_range

A floating point property that controls the source voltage range in Volts, which can take values from -210 to 210 V. Auto-range is disabled when this property is set.

property standard_devs

Returns the calculated standard deviations for voltage, current, and resistance from the buffer data as a list.

start_buffer()

Starts the buffer.

property std_current

Returns the current standard deviation from the buffer

property std_resistance

Returns the resistance standard deviation from the buffer

property std_voltage

Returns the voltage standard deviation from the buffer

stop_buffer()

Aborts the buffering measurement, by stopping the measurement arming and triggering sequence. If possible, a Selected Device Clear (SDC) is used.

triad(base_frequency, duration)

Sounds a musical triad using the system beep.

Parameters
  • base_frequency – A frequency in Hz between 65 Hz and 1.3 MHz

  • duration – A time in seconds between 0 and 7.9 seconds

trigger()

Executes a bus trigger, which can be used when trigger_on_bus() is configured.

property trigger_count

An integer property that controls the trigger count, which can take values from 1 to 9,999.

property trigger_delay

A floating point property that controls the trigger delay in seconds, which can take values from 0 to 999.9999 s.

trigger_immediately()

Configures measurements to be taken with the internal trigger at the maximum sampling rate.

trigger_on_bus()

Configures the trigger to detect events based on the bus trigger, which can be activated by GET or *TRG.

trigger_on_external(line=1)

Configures the measurement trigger to be taken from a specific line of an external trigger

Parameters

line – A trigger line from 1 to 4

use_front_terminals()

Enables the front terminals for measurement, and disables the rear terminals.

use_rear_terminals()

Enables the rear terminals for measurement, and disables the front terminals.

property voltage

Reads the voltage in Volts, if configured for this reading.

property voltage_nplc

A floating point property that controls the number of power line cycles (NPLC) for the DC voltage measurements, which sets the integration period and measurement speed. Takes values from 0.01 to 10, where 0.1, 1, and 10 are Fast, Medium, and Slow respectively.

property voltage_range

A floating point property that controls the measurement voltage range in Volts, which can take values from -210 to 210 V. Auto-range is disabled when this property is set.

wait_for_buffer(should_stop=<function KeithleyBuffer.<lambda>>, timeout=60, interval=0.1)

Blocks the program, waiting for a full buffer. This function returns early if the should_stop function returns True or the timeout is reached before the buffer is full.

Parameters
  • should_stop – A function that returns True when this function should return early

  • timeout – A time in seconds after which this function should return early

  • interval – A time in seconds for how often to check if the buffer is full

property wires

An integer property that controls the number of wires in use for resistance measurements, which can take the value of 2 or 4.