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QDAC2.py
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QDAC2.py
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import numpy as np
import uuid
from qcodes.instrument.channel import InstrumentChannel, ChannelList
from qcodes.instrument.visa import VisaInstrument
from pyvisa.errors import VisaIOError
from qcodes.utils import validators
from typing import Any, NewType, Sequence, List, Dict, Tuple, Optional
from packaging.version import parse
# Version 0.11.2
#
# Guiding principles for this driver for QDevil QDAC-II
# -----------------------------------------------------
#
# 1. Each command should be self-contained, so
#
# qdac.ch02.dc_constant_V(0.1)
#
# should make sure that channel 2 is in the right mode for outputting
# a constant voltage.
#
# 2. Numeric values should be in ISO units and/or their unit should be an
# explicitly part of the function name, like above, or, if unit-less number,
# then prefixed by n_ like
#
# qdac.n_channels()
#
# 3. Allocation of resources should be automated as much as possible, preferably
# by python context managers that automatically clean up on exit. Such
# context managers have a name with a '_Context' suffix.
#
# 4. Any generator should by default be set to start on the bus trigger
# (*TRG) so that it is possible to synchronise several generators without
# further set up; which also eliminates the need for special cases for the
# bus trigger.
#
# Future improvements
# -------------------
#
# - Detect and handle mixing of internal and external triggers (_trigger).
#
error_ambiguous_wave = 'Only one of frequency_Hz or period_s can be ' \
'specified for a wave form'
"""External input trigger
There are four 3V3 non-isolated triggers on the back (1, 2, 3, 4).
"""
ExternalInput = NewType('ExternalInput', int)
class QDac2Trigger_Context:
"""Internal Triggers with automatic deallocation
This context manager wraps an already-allocated internal trigger number so
that the trigger can be automatically reclaimed when the context exits.
"""
def __init__(self, parent: 'QDac2', value: int):
self._parent = parent
self._value = value
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self._parent.free_trigger(self)
# Propagate exceptions
return False
@property
def value(self) -> int:
"""Get the internal SCPI trigger number
Returns:
int: internal trigger number
"""
return self._value
def _trigger_context_to_value(trigger: QDac2Trigger_Context) -> int:
return trigger.value
class QDac2ExternalTrigger(InstrumentChannel):
"""External output trigger
There are three 5V isolated triggers on the front (1, 2, 3) and two
non-isolated 3V3 on the back (4, 5).
"""
def __init__(self, parent: 'QDac2', name: str, external: int):
super().__init__(parent, name)
self.add_function(
name='source_from_bus',
call_cmd=f'outp:trig{external}:sour bus'
)
self.add_parameter(
name='source_from_input',
# Route external input to external output
set_cmd='outp:trig{0}:sour ext{1}'.format(external, '{}'),
get_parser=int
)
self.add_parameter(
name='source_from_trigger',
# Route internal trigger to external output
set_parser=_trigger_context_to_value,
set_cmd='outp:trig{0}:sour int{1}'.format(external, '{}'),
get_parser=int
)
self.add_parameter(
name='width_s',
label='width',
unit='s',
set_cmd='outp:trig{0}:widt {1}'.format(external, '{}'),
get_cmd=f'outp:trig{external}:widt?',
get_parser=float
)
self.add_parameter(
name='polarity',
label='polarity',
set_cmd='outp:trig{0}:pol {1}'.format(external, '{}'),
get_cmd=f'outp:trig{external}:pol?',
get_parser=str,
vals=validators.Enum('inv', 'norm')
)
self.add_parameter(
name='delay_s',
label='delay',
unit='s',
set_cmd='outp:trig{0}:del {1}'.format(external, '{}'),
get_cmd=f'outp:trig{external}:del?',
get_parser=float
)
self.add_function(
name='signal',
call_cmd=f'outp:trig{external}:sign'
)
def floats_to_comma_separated_list(array: Sequence[float]):
rounded = [format(x, 'g') for x in array]
return ', '.join(rounded)
def array_to_comma_separated_list(array: str):
return ', '.join(map(str, array))
def comma_sequence_to_list(sequence: str):
if not sequence:
return []
return [x.strip() for x in sequence.split(',')]
def comma_sequence_to_list_of_floats(sequence: str):
if not sequence:
return []
return [float(x.strip()) for x in sequence.split(',')]
class _Channel_Context():
def __init__(self, channel: 'QDac2Channel'):
self._channel = channel
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
# Propagate exceptions
return False
def allocate_trigger(self) -> QDac2Trigger_Context:
"""Allocate internal trigger
Returns:
QDac2Trigger_Context: Context that wraps the trigger
"""
return self._channel._parent.allocate_trigger()
def _write_channel(self, cmd: str) -> None:
self._channel.write_channel(cmd)
def _write_channel_floats(self, cmd: str, values: Sequence[float]) -> None:
self._channel.write_channel_floats(cmd, values)
def _ask_channel(self, cmd: str) -> str:
return self._channel.ask_channel(cmd)
def _channel_message(self, template: str) -> None:
return self._channel._channel_message(template)
class _Dc_Context(_Channel_Context):
def __init__(self, channel: 'QDac2Channel'):
super().__init__(channel)
self._write_channel('sour{0}:dc:trig:sour hold')
self._trigger: Optional[QDac2Trigger_Context] = None
self._marker_start: Optional[QDac2Trigger_Context] = None
self._marker_end: Optional[QDac2Trigger_Context] = None
self._marker_step_start: Optional[QDac2Trigger_Context] = None
self._marker_step_end: Optional[QDac2Trigger_Context] = None
def start_on(self, trigger: QDac2Trigger_Context) -> None:
"""Attach internal trigger to DC generator
Args:
trigger (QDac2Trigger_Context): trigger that will start DC
"""
self._trigger = trigger
internal = _trigger_context_to_value(trigger)
self._write_channel(f'sour{"{0}"}:dc:trig:sour int{internal}')
self._make_ready_to_start()
def start_on_external(self, trigger: ExternalInput) -> None:
"""Attach external trigger to DC generator
Args:
trigger (ExternalInput): trigger that will start DC generator
"""
self._trigger = None
self._write_channel(f'sour{"{0}"}:dc:trig:sour ext{trigger}')
self._make_ready_to_start()
def abort(self) -> None:
"""Abort any DC running generator on the channel
"""
self._write_channel('sour{0}:dc:abor')
def end_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the end of the DC generator
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end
"""
if not self._marker_end:
self._marker_end = self.allocate_trigger()
self._write_channel(f'sour{"{0}"}:dc:mark:end {self._marker_end.value}')
return self._marker_end
def start_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the beginning of the DC generator
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the beginning
"""
if not self._marker_start:
self._marker_start = self.allocate_trigger()
self._write_channel(f'sour{"{0}"}:dc:mark:star {self._marker_start.value}')
return self._marker_start
def step_end_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the end of each step
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end of each step
"""
if not self._marker_step_end:
self._marker_step_end = self.allocate_trigger()
self._write_channel(f'sour{"{0}"}:dc:mark:send {self._marker_step_end.value}')
return self._marker_step_end
def step_start_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the beginning of each step
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end of each step
"""
if not self._marker_step_start:
self._marker_step_start = self.allocate_trigger()
self._write_channel(f'sour{"{0}"}:dc:mark:sst {self._marker_step_start.value}')
return self._marker_step_start
def _set_triggering(self) -> None:
self._write_channel('sour{0}:dc:trig:sour bus')
self._make_ready_to_start()
def _start(self, description: str) -> None:
if self._trigger:
self._make_ready_to_start()
return self._write_channel(f'tint {self._trigger.value}')
self._switch_to_immediate_trigger()
self._write_channel('sour{0}:dc:init')
def _make_ready_to_start(self) -> None:
self._write_channel('sour{0}:dc:init:cont on')
self._write_channel('sour{0}:dc:init')
def _switch_to_immediate_trigger(self) -> None:
self._write_channel('sour{0}:dc:init:cont off')
self._write_channel('sour{0}:dc:trig:sour imm')
class Sweep_Context(_Dc_Context):
def __init__(self, channel: 'QDac2Channel', start_V: float, stop_V: float,
points: int, repetitions: int, dwell_s: float, backwards: bool,
stepped: bool):
self._repetitions = repetitions
super().__init__(channel)
channel.write_channel('sour{0}:volt:mode swe')
self._set_voltages(start_V, stop_V)
channel.write_channel(f'sour{"{0}"}:swe:poin {points}')
self._set_trigger_mode(stepped)
channel.write_channel(f'sour{"{0}"}:swe:dwel {dwell_s}')
self._set_direction(backwards)
self._set_repetitions()
self._set_triggering()
def _set_voltages(self, start_V: float, stop_V: float):
self._write_channel(f'sour{"{0}"}:swe:star {start_V}')
self._write_channel(f'sour{"{0}"}:swe:stop {stop_V}')
def _set_trigger_mode(self, stepped: bool) -> None:
if stepped:
return self._write_channel('sour{0}:swe:gen step')
self._write_channel('sour{0}:swe:gen auto')
def _set_direction(self, backwards: bool) -> None:
if backwards:
return self._write_channel('sour{0}:swe:dir down')
self._write_channel('sour{0}:swe:dir up')
def _set_repetitions(self) -> None:
self._write_channel(f'sour{"{0}"}:swe:coun {self._repetitions}')
def _perpetual(self) -> bool:
return self._repetitions < 0
def start(self) -> None:
"""Start the DC sweep
"""
self._start('DC sweep')
def points(self) -> int:
"""
Returns:
int: Number of steps in the DC sweep
"""
return int(self._ask_channel('sour{0}:swe:poin?'))
def cycles_remaining(self) -> int:
"""
Returns:
int: Number of cycles remaining in the DC sweep
"""
return int(self._ask_channel('sour{0}:swe:ncl?'))
def time_s(self) -> float:
"""
Returns:
float: Seconds that it will take to do the sweep
"""
return float(self._ask_channel('sour{0}:swe:time?'))
class List_Context(_Dc_Context):
def __init__(self, channel: 'QDac2Channel', voltages: Sequence[float],
repetitions: int, dwell_s: float, backwards: bool,
stepped: bool):
super().__init__(channel)
self._repetitions = repetitions
self._write_channel('sour{0}:volt:mode list')
self._set_voltages(voltages)
self._set_trigger_mode(stepped)
self._write_channel(f'sour{"{0}"}:list:dwel {dwell_s}')
self._set_direction(backwards)
self._set_repetitions()
self._set_triggering()
def _set_voltages(self, voltages: Sequence[float]) -> None:
self._write_channel_floats('sour{0}:list:volt ', voltages)
def _set_trigger_mode(self, stepped: bool) -> None:
if stepped:
return self._write_channel('sour{0}:list:tmod step')
self._write_channel('sour{0}:list:tmod auto')
def _set_direction(self, backwards: bool) -> None:
if backwards:
return self._write_channel('sour{0}:list:dir down')
self._write_channel('sour{0}:list:dir up')
def _set_repetitions(self) -> None:
self._write_channel(f'sour{"{0}"}:list:coun {self._repetitions}')
def _perpetual(self) -> bool:
return self._repetitions < 0
def start(self) -> None:
"""Start the DC list generator
"""
self._start('DC list')
def append(self, voltages: Sequence[float]) -> None:
"""Append voltages to the existing list
Arguments:
voltages (Sequence[float]): Sequence of voltages
"""
self._write_channel_floats('sour{0}:list:volt:app ', voltages)
self._make_ready_to_start()
def points(self) -> int:
"""
Returns:
int: Number of steps in the DC list
"""
return int(self._ask_channel('sour{0}:list:poin?'))
def cycles_remaining(self) -> int:
"""
Returns:
int: Number of cycles remaining in the DC list
"""
return int(self._ask_channel('sour{0}:list:ncl?'))
class _Waveform_Context(_Channel_Context):
def __init__(self, channel: 'QDac2Channel'):
super().__init__(channel)
self._trigger: Optional[QDac2Trigger_Context] = None
self._marker_start: Optional[QDac2Trigger_Context] = None
self._marker_end: Optional[QDac2Trigger_Context] = None
self._marker_period_start: Optional[QDac2Trigger_Context] = None
self._marker_period_end: Optional[QDac2Trigger_Context] = None
def _start(self, wave_kind: str, description: str) -> None:
if self._trigger:
self._make_ready_to_start(wave_kind)
return self._write_channel(f'tint {self._trigger.value}')
self._switch_to_immediate_trigger(wave_kind)
self._write_channel(f'sour{"{0}"}:{wave_kind}:init')
def _start_on(self, trigger: QDac2Trigger_Context, wave_kind: str) -> None:
self._trigger = trigger
internal = _trigger_context_to_value(trigger)
self._write_channel(f'sour{"{0}"}:{wave_kind}:trig:sour int{internal}')
self._make_ready_to_start(wave_kind)
def _start_on_external(self, trigger: ExternalInput, wave_kind: str) -> None:
self._trigger = None
self._write_channel(f'sour{"{0}"}:{wave_kind}:trig:sour ext{trigger}')
self._make_ready_to_start(wave_kind)
def _end_marker(self, wave_kind: str) -> QDac2Trigger_Context:
if not self._marker_end:
self._marker_end = self.allocate_trigger()
self._write_channel(f'sour{"{0}"}:{wave_kind}:mark:end {self._marker_end.value}')
return self._marker_end
def _start_marker(self, wave_kind: str) -> QDac2Trigger_Context:
if not self._marker_start:
self._marker_start = self.allocate_trigger()
self._write_channel(f'sour{"{0}"}:{wave_kind}:mark:star {self._marker_start.value}')
return self._marker_start
def _period_end_marker(self, wave_kind: str) -> QDac2Trigger_Context:
if not self._marker_period_end:
self._marker_period_end = self.allocate_trigger()
self._write_channel(f'sour{"{0}"}:{wave_kind}:mark:pend {self._marker_period_end.value}')
return self._marker_period_end
def _period_start_marker(self, wave_kind: str) -> QDac2Trigger_Context:
if not self._marker_period_start:
self._marker_period_start = self.allocate_trigger()
self._write_channel(f'sour{"{0}"}:{wave_kind}:mark:psta {self._marker_period_start.value}')
return self._marker_period_start
def _make_ready_to_start(self, wave_kind: str) -> None:
self._write_channel(f'sour{"{0}"}:{wave_kind}:init:cont on')
self._write_channel(f'sour{"{0}"}:{wave_kind}:init')
def _switch_to_immediate_trigger(self, wave_kind: str):
self._write_channel(f'sour{"{0}"}:{wave_kind}:init:cont off')
self._write_channel(f'sour{"{0}"}:{wave_kind}:trig:sour imm')
def _set_slew(self, wave_kind: str, slew_V_s: Optional[float]) -> None:
if slew_V_s:
# Bug, see https://trello.com/c/SeeUrRNY
self._write_channel(f'sour{"{0}"}:{wave_kind}:slew {slew_V_s}')
else:
self._write_channel(f'sour{"{0}"}:{wave_kind}:slew inf')
class Square_Context(_Waveform_Context):
def __init__(self, channel: 'QDac2Channel', frequency_Hz: Optional[float],
repetitions: int, period_s: Optional[float],
duty_cycle_percent: float, kind: str, inverted: bool,
span_V: float, offset_V: float, slew_V_s: Optional[float]):
super().__init__(channel)
self._repetitions = repetitions
self._write_channel('sour{0}:squ:trig:sour hold')
self._set_frequency(frequency_Hz, period_s)
self._write_channel(f'sour{"{0}"}:squ:dcyc {duty_cycle_percent}')
self._set_type(kind)
self._set_polarity(inverted)
self._write_channel(f'sour{"{0}"}:squ:span {span_V}')
self._write_channel(f'sour{"{0}"}:squ:offs {offset_V}')
self._set_slew('squ', slew_V_s)
self._write_channel(f'sour{"{0}"}:squ:coun {repetitions}')
self._set_triggering()
def start(self) -> None:
"""Start the square wave generator
"""
self._start('squ', 'square wave')
def abort(self) -> None:
"""Abort any running square wave generator
"""
self._write_channel('sour{0}:squ:abor')
def cycles_remaining(self) -> int:
"""
Returns:
int: Number of cycles remaining in the square wave
"""
return int(self._ask_channel('sour{0}:squ:ncl?'))
def _set_frequency(self, frequency_Hz: Optional[float],
period_s: Optional[float]) -> None:
if frequency_Hz:
return self._write_channel(f'sour{"{0}"}:squ:freq {frequency_Hz}')
if period_s:
self._write_channel(f'sour{"{0}"}:squ:per {period_s}')
def _set_type(self, kind: str) -> None:
if kind == 'positive':
self._write_channel('sour{0}:squ:typ pos')
elif kind == 'negative':
self._write_channel('sour{0}:squ:typ neg')
else:
self._write_channel('sour{0}:squ:typ symm')
def _set_polarity(self, inverted: bool) -> None:
if inverted:
self._write_channel('sour{0}:squ:pol inv')
else:
self._write_channel('sour{0}:squ:pol norm')
def _set_triggering(self) -> None:
self._write_channel('sour{0}:squ:trig:sour bus')
self._make_ready_to_start('squ')
def end_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the end of the square wave
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end
"""
return super()._end_marker('squ')
def start_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the beginning of the square wave
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the beginning
"""
return super()._start_marker('squ')
def period_end_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the end of each period
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end of each period
"""
return super()._period_end_marker('squ')
def period_start_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the beginning of each period
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the beginning of each period
"""
return super()._period_start_marker('squ')
def start_on(self, trigger: QDac2Trigger_Context) -> None:
"""Attach internal trigger to start the square wave generator
Args:
trigger (QDac2Trigger_Context): trigger that will start square wave
"""
return super()._start_on(trigger, 'squ')
def start_on_external(self, trigger: ExternalInput) -> None:
"""Attach external trigger to start the square wave generator
Args:
trigger (ExternalInput): external trigger that will start square wave
"""
return super()._start_on_external(trigger, 'squ')
class Sine_Context(_Waveform_Context):
def __init__(self, channel: 'QDac2Channel', frequency_Hz: Optional[float],
repetitions: int, period_s: Optional[float], inverted: bool,
span_V: float, offset_V: float, slew_V_s: Optional[float]):
super().__init__(channel)
self._repetitions = repetitions
self._write_channel('sour{0}:sin:trig:sour hold')
self._set_frequency(frequency_Hz, period_s)
self._set_polarity(inverted)
self._write_channel(f'sour{"{0}"}:sin:span {span_V}')
self._write_channel(f'sour{"{0}"}:sin:offs {offset_V}')
self._set_slew('sin', slew_V_s)
self._write_channel(f'sour{"{0}"}:sin:coun {repetitions}')
self._set_triggering()
def start(self) -> None:
"""Start the sine wave generator
"""
self._start('sin', 'sine wave')
def abort(self) -> None:
"""Abort any running sine wave generator
"""
self._write_channel('sour{0}:sin:abor')
def cycles_remaining(self) -> int:
"""
Returns:
int: Number of cycles remaining in the sine wave
"""
return int(self._ask_channel('sour{0}:sin:ncl?'))
def _set_frequency(self, frequency_Hz: Optional[float],
period_s: Optional[float]) -> None:
if frequency_Hz:
return self._write_channel(f'sour{"{0}"}:sin:freq {frequency_Hz}')
if period_s:
self._write_channel(f'sour{"{0}"}:sin:per {period_s}')
def _set_polarity(self, inverted: bool) -> None:
if inverted:
self._write_channel('sour{0}:sin:pol inv')
else:
self._write_channel('sour{0}:sin:pol norm')
def _set_triggering(self) -> None:
self._write_channel('sour{0}:sin:trig:sour bus')
self._make_ready_to_start('sin')
def end_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the end of the sine wave
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end
"""
return super()._end_marker('sin')
def start_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the beginning of the sine wave
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the beginning
"""
return super()._start_marker('sin')
def period_end_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the end of each period
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end of each period
"""
return super()._period_end_marker('sin')
def period_start_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the beginning of each period
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the beginning of each period
"""
return super()._period_start_marker('sin')
def start_on(self, trigger: QDac2Trigger_Context) -> None:
"""Attach internal trigger to start the sine wave generator
Args:
trigger (QDac2Trigger_Context): trigger that will start sine wave
"""
return super()._start_on(trigger, 'sin')
def start_on_external(self, trigger: ExternalInput) -> None:
"""Attach external trigger to start the sine wave generator
Args:
trigger (ExternalInput): external trigger that will start sine wave
"""
return super()._start_on_external(trigger, 'sin')
class Triangle_Context(_Waveform_Context):
def __init__(self, channel: 'QDac2Channel', frequency_Hz: Optional[float],
repetitions: int, period_s: Optional[float],
duty_cycle_percent: float, inverted: bool, span_V: float,
offset_V: float, slew_V_s: Optional[float]):
super().__init__(channel)
self._repetitions = repetitions
self._write_channel('sour{0}:tri:trig:sour hold')
self._set_frequency(frequency_Hz, period_s)
self._write_channel(f'sour{"{0}"}:tri:dcyc {duty_cycle_percent}')
self._set_polarity(inverted)
self._write_channel(f'sour{"{0}"}:tri:span {span_V}')
self._write_channel(f'sour{"{0}"}:tri:offs {offset_V}')
self._set_slew('tri', slew_V_s)
self._write_channel(f'sour{"{0}"}:tri:coun {repetitions}')
self._set_triggering()
def start(self) -> None:
"""Start the triangle wave generator
"""
self._start('tri', 'triangle wave')
def abort(self) -> None:
"""Abort any running triangle wave generator
"""
self._write_channel('sour{0}:tri:abor')
def cycles_remaining(self) -> int:
"""
Returns:
int: Number of cycles remaining in the triangle wave
"""
return int(self._ask_channel('sour{0}:tri:ncl?'))
def _set_frequency(self, frequency_Hz: Optional[float],
period_s: Optional[float]) -> None:
if frequency_Hz:
return self._write_channel(f'sour{"{0}"}:tri:freq {frequency_Hz}')
if period_s:
self._write_channel(f'sour{"{0}"}:tri:per {period_s}')
def _set_type(self, kind: bool) -> None:
if kind == 'positive':
self._write_channel('sour{0}:tri:typ pos')
elif kind == 'negative':
self._write_channel('sour{0}:tri:typ neg')
else:
self._write_channel('sour{0}:tri:typ symm')
def _set_polarity(self, inverted: bool) -> None:
if inverted:
self._write_channel('sour{0}:tri:pol inv')
else:
self._write_channel('sour{0}:tri:pol norm')
def _set_triggering(self) -> None:
self._write_channel('sour{0}:tri:trig:sour bus')
self._make_ready_to_start('tri')
def end_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the end of the triangle wave
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end
"""
return super()._end_marker('tri')
def start_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the beginning of the triangle wave
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the beginning
"""
return super()._start_marker('tri')
def period_end_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the end of each period
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end of each period
"""
return super()._period_end_marker('tri')
def period_start_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the beginning of each period
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the beginning of each period
"""
return super()._period_start_marker('tri')
def start_on(self, trigger: QDac2Trigger_Context) -> None:
"""Attach internal trigger to start the triangle wave generator
Args:
trigger (QDac2Trigger_Context): trigger that will start triangle
"""
return super()._start_on(trigger, 'tri')
def start_on_external(self, trigger: ExternalInput) -> None:
"""Attach external trigger to start the triangle wave generator
Args:
trigger (ExternalInput): external trigger that will start triangle
"""
return super()._start_on_external(trigger, 'tri')
class Awg_Context(_Waveform_Context):
def __init__(self, channel: 'QDac2Channel', trace_name: str,
repetitions: int, scale: float, offset_V: float,
slew_V_s: Optional[float]):
super().__init__(channel)
self._repetitions = repetitions
self._write_channel('sour{0}:awg:trig:sour hold')
self._write_channel(f'sour{"{0}"}:awg:def "{trace_name}"')
self._write_channel(f'sour{"{0}"}:awg:scal {scale}')
self._write_channel(f'sour{"{0}"}:awg:offs {offset_V}')
self._set_slew('awg', slew_V_s)
self._write_channel(f'sour{"{0}"}:awg:coun {repetitions}')
self._set_triggering()
def start(self) -> None:
"""Start the AWG
"""
self._start('awg', 'AWG')
def abort(self) -> None:
"""Abort any running AWG
"""
self._write_channel('sour{0}:awg:abor')
def cycles_remaining(self) -> int:
"""
Returns:
int: Number of cycles remaining in the AWG
"""
return int(self._ask_channel('sour{0}:awg:ncl?'))
def _set_triggering(self) -> None:
self._write_channel('sour{0}:awg:trig:sour bus')
self._make_ready_to_start('awg')
def end_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the end of the AWG
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end
"""
return super()._end_marker('awg')
def start_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the beginning of the AWG
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the beginning
"""
return super()._start_marker('awg')
def period_end_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the end of each period
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the end of each period
"""
return super()._period_end_marker('awg')
def period_start_marker(self) -> QDac2Trigger_Context:
"""Internal trigger that will mark the beginning of each period
A new internal trigger is allocated if necessary.
Returns:
QDac2Trigger_Context: trigger that will mark the beginning of each period
"""
return super()._period_start_marker('awg')
def start_on(self, trigger: QDac2Trigger_Context) -> None:
"""Attach internal trigger to start the AWG
Args:
trigger (QDac2Trigger_Context): trigger that will start AWG
"""
return super()._start_on(trigger, 'awg')
def start_on_external(self, trigger: ExternalInput) -> None:
"""Attach external trigger to start the AWG
Args:
trigger (ExternalInput): external trigger that will start AWG
"""
return super()._start_on_external(trigger, 'awg')
class Measurement_Context(_Channel_Context):
def __init__(self, channel: 'QDac2Channel', delay_s: float,
repetitions: int, current_range: str,
aperture_s: Optional[float], nplc: Optional[int]):
super().__init__(channel)
self._trigger: Optional[QDac2Trigger_Context] = None
self._write_channel(f'sens{"{0}"}:del {delay_s}')
self._write_channel(f'sens{"{0}"}:rang {current_range}')
self._set_aperture(aperture_s, nplc)
self._write_channel(f'sens{"{0}"}:coun {repetitions}')
self._set_triggering()
def start(self) -> None:
"""Start a current measurement
"""
if self._trigger:
return self._write_channel(f'tint {self._trigger.value}')
self._switch_to_immediate_trigger()
self._write_channel('sens{0}:init')
def _switch_to_immediate_trigger(self) -> None:
self._write_channel('sens{0}:init:cont off')
self._write_channel('sens{0}:trig:sour imm')
def start_on(self, trigger: QDac2Trigger_Context) -> None:
"""Attach internal trigger to start the current measurement
Args:
trigger (QDac2Trigger_Context): trigger that will start measurement
"""
self._trigger = trigger
internal = _trigger_context_to_value(trigger)
self._write_channel(f'sens{"{0}"}:trig:sour int{internal}')
self._write_channel(f'sens{"{0}"}:init:cont on')
self._write_channel(f'sens{"{0}"}:init')
def start_on_external(self, trigger: ExternalInput) -> None:
"""Attach external trigger to start the current measurement
Args:
trigger (ExternalInput): trigger that will start measurement
"""
self._write_channel(f'sens{"{0}"}:trig:sour ext{trigger}')
self._write_channel(f'sens{"{0}"}:init:cont on')
self._write_channel(f'sens{"{0}"}:init')
def abort(self) -> None:
"""Abort current measurement
"""
self._write_channel('sens{0}:abor')
def n_cycles_remaining(self) -> int:
"""
Returns:
int: Number of measurements remaining
"""
return int(self._ask_channel('sens{0}:ncl?'))
def n_available(self) -> int:
"""
Returns:
int: Number of measurements available
"""