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#
# This file is part of the PyMeasure package.
#
# Copyright (c) 2013-2024 PyMeasure Developers
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
from pymeasure.instruments import Instrument, SCPIUnknownMixin
from pymeasure.instruments.validators import strict_discrete_set, \
truncated_discrete_set, truncated_range
class SR570(SCPIUnknownMixin, Instrument):
def __init__(self, adapter, name="Stanford Research Systems SR570 Lock-in amplifier",
**kwargs):
super().__init__(
adapter,
name,
**kwargs
)
SENSITIVITIES = [
1e-12, 2e-12, 5e-12, 10e-12, 20e-12, 50e-12, 100e-12, 200e-12, 500e-12,
1e-9, 2e-9, 5e-9, 10e-9, 20e-9, 50e-9, 100e-9, 200e-9, 500e-9,
1e-6, 2e-6, 5e-6, 10e-6, 20e-6, 50e-6, 100e-6, 200e-6, 500e-6,
1e-3
]
FREQUENCIES = [
0.03, 0.1, 0.3, 1, 3, 10, 30, 100, 300, 1e3, 3e3, 1e4, 3e4,
1e5, 3e5, 1e6
]
FILT_TYPES = ['6dB Highpass', '12dB Highpass', '6dB Bandpass',
'6dB Lowpass', '12dB Lowpass', 'none']
BIAS_LIMITS = [-5, 5]
OFFSET_CURRENTS = [
1e-12, 2e-12, 5e-12, 10e-12, 20e-12, 50e-12, 100e-12, 200e-12, 500e-12,
1e-9, 2e-9, 5e-9, 10e-9, 20e-9, 50e-9, 100e-9, 200e-9, 500e-9,
1e-6, 2e-6, 5e-6, 10e-6, 20e-6, 50e-6, 100e-6, 200e-6, 500e-6,
1e-3, 2e-3, 5e-3
]
GAIN_MODES = [
'Low Noise', 'High Bandwidth', 'Low Drift'
]
sensitivity = Instrument.setting(
"SENS %d",
""" A floating point value that sets the sensitivity of the
amplifier, which takes discrete values in a 1-2-5 sequence.
Values are truncated to the closest allowed value if not exact.
Allowed values range from 1 pA/V to 1 mA/V.""",
validator=truncated_discrete_set,
values=SENSITIVITIES,
map_values=True)
filter_type = Instrument.setting(
"FLTT %d",
""" A string that sets the filter type.
Allowed values are: {}""".format(FILT_TYPES),
validator=truncated_discrete_set,
values=FILT_TYPES,
map_values=True)
low_freq = Instrument.setting(
"LFRQ %d",
""" A floating point value that sets the lowpass frequency of the
amplifier, which takes a discrete value in a 1-3 sequence.
Values are truncated to the closest allowed value if not exact.
Allowed values range from 0.03 Hz to 1 MHz.""",
validator=truncated_discrete_set,
values=FREQUENCIES,
map_values=True)
high_freq = Instrument.setting(
"HFRQ %d",
""" A floating point value that sets the highpass frequency of the
amplifier, which takes a discrete value in a 1-3 sequence.
Values are truncated to the closest allowed value if not exact.
Allowed values range from 0.03 Hz to 1 MHz.""",
validator=truncated_discrete_set,
values=FREQUENCIES,
map_values=True)
bias_level = Instrument.setting(
"BSLV %g",
""" A floating point value in V that sets the bias voltage level of the
amplifier, in the [-5V,+5V] limits.
The values are up to 1 mV precision level.""",
validator=truncated_range,
values=BIAS_LIMITS,
set_process=lambda v: int(1000 * v))
offset_current = Instrument.setting(
"BSLV %f",
""" A floating point value in A that sets the absolute value
of the offset current of the amplifier, in the [1pA,5mA] limits.
The offset current takes discrete values in a 1-2-5 sequence.
Values are truncated to the closest allowed value if not exact. """,
validator=truncated_discrete_set,
values=OFFSET_CURRENTS,
map_values=True)
offset_current_sign = Instrument.setting(
"IOSN %d",
""" An string that sets the offset current sign.
Allowed values are: 'positive' and 'negative'. """,
validator=strict_discrete_set,
values={'positive': 1, 'negative': 0},
map_values=True)
gain_mode = Instrument.setting(
"GNMD %d",
""" A string that sets the gain mode.
Allowed values are: {}""".format(GAIN_MODES),
validator=truncated_discrete_set,
values=GAIN_MODES,
map_values=True)
invert_signal_sign = Instrument.setting(
"INVT %d",
""" An boolean sets the signal invert sense.
Allowed values are: True (inverted) and False (not inverted). """,
validator=strict_discrete_set,
values={True: 1, False: 0},
map_values=True)
bias_enabled = Instrument.setting(
"BSON %d",
""" Boolean that turns the bias on or off.
Allowed values are: True (bias on) and False (bias off)""",
validator=strict_discrete_set,
values={True: 1, False: 0},
map_values=True)
offset_current_enabled = Instrument.setting(
"IOON %d",
""" Boolean that turns the offset current on or off.
Allowed values are: True (current on) and False (current off).""",
validator=strict_discrete_set,
values={True: 1, False: 0},
map_values=True)
front_blanked = Instrument.setting(
"BLNK %d",
""" Boolean that blanks(True) or un-blanks (False) the front panel""",
validator=strict_discrete_set,
values={True: 1, False: 0},
map_values=True)
signal_inverted = Instrument.setting(
"INVT %d",
""" Boolean that inverts the signal if True""",
validator=strict_discrete_set,
values={True: 1, False: 0},
map_values=True)
####################
# Methods #
####################
def enable_bias(self):
"""Turns the bias voltage on"""
self.bias_enabled = True
def disable_bias(self):
"""Turns the bias voltage off"""
self.bias_enabled = False
def enable_offset_current(self):
""""Enables the offset current """
self.offset_current_enabled = True
def disable_offset_current(self):
""""Disables the offset current """
self.offset_current_enabled = False
def clear_overload(self):
""""Reset the filter capacitors to clear an overload condition"""
self.write("ROLD")
def blank_front(self):
""""Blanks the frontend output of the device"""
self.front_blanked = True
def unblank_front(self):
"""Un-blanks the frontend output of the device"""
self.front_blanked = False
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