Source code for qcodes.instrument_drivers.ithaco.Ithaco_1211

from typing import Any, Dict, Optional, Tuple

from qcodes.instrument import Instrument
from qcodes.parameters import MultiParameter, Parameter, ParamRawDataType
from qcodes.validators import Bool, Enum

[docs]class CurrentParameter(MultiParameter): """ Voltage measurement via an Ithaco preamp and converting volt to current. To be used when you feed a current into the Ithaco, send the Ithaco's output voltage to a lockin or other voltage amplifier, and you have the voltage reading from that amplifier as a qcodes parameter. ``CurrentParameter.get()`` returns ``(volt_raw, curr)`` Args: measured_param: a gettable parameter returning the voltage read from the Ithaco output. c_amp_ins: an Ithaco instance where you manually maintain the present settings of the real Ithaco amp. Note: it should be possible to use other current preamps, if they define parameters ``sens`` (sensitivity, in A/V), ``sens_factor`` (an additional gain) and ``invert`` (bool, output is inverted) name: the name of the current output. Default 'curr'. Also used as the name of the whole parameter. """ def __init__(self, measured_param: Parameter, c_amp_ins: "Ithaco_1211", name: str = 'curr'): p_name = super().__init__(name=name, names=(p_name+'_raw', name), shapes=((), ()), setpoints=((), ()), instrument=c_amp_ins, snapshot_value=True) self._measured_param = measured_param p_label = getattr(measured_param, "label", "") p_unit = getattr(measured_param, "unit", "") self.labels = (p_label, 'Current') self.units = (p_unit, 'A')
[docs] def get_raw(self) -> Tuple[ParamRawDataType, ...]: assert isinstance(self.instrument, Ithaco_1211) volt = self._measured_param.get() current = (self.instrument.sens.get() * self.instrument.sens_factor.get()) * volt if self.instrument.invert.get(): current *= -1 value = (volt, current) return value
[docs]class Ithaco_1211(Instrument): """ This is the qcodes driver for the Ithaco 1211 Current-preamplifier. This is a virtual driver only and will not talk to your instrument. """ def __init__(self, name: str, **kwargs: Any): super().__init__(name, **kwargs) self.add_parameter('sens', initial_value=1e-8, label='Sensitivity', unit='A/V', get_cmd=None, set_cmd=None, vals=Enum(1e-11, 1e-10, 1e-09, 1e-08, 1e-07, 1e-06, 1e-05, 1e-4, 1e-3)) self.add_parameter('invert', initial_value=True, label='Inverted output', get_cmd=None, set_cmd=None, vals=Bool()) self.add_parameter('sens_factor', initial_value=1, label='Sensitivity factor', unit=None, get_cmd=None, set_cmd=None, vals=Enum(0.1, 1, 10)) self.add_parameter('suppression', initial_value=1e-7, label='Suppression', unit='A', get_cmd=None, set_cmd=None, vals=Enum(1e-10, 1e-09, 1e-08, 1e-07, 1e-06, 1e-05, 1e-4, 1e-3)) self.add_parameter('risetime', initial_value=0.3, label='Rise Time', unit='msec', get_cmd=None, set_cmd=None, vals=Enum(0.01, 0.03, 0.1, 0.3, 1, 3, 10, 30, 100, 300, 1000))
[docs] def get_idn(self) -> Dict[str, Optional[str]]: vendor = 'Ithaco (DL Instruments)' model = '1211' serial = None firmware = None return {'vendor': vendor, 'model': model, 'serial': serial, 'firmware': firmware}