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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.
#
# =============================================================================
# Libraries / modules
# =============================================================================
from .dsp_base import DSPBase
from pymeasure.instruments import Instrument
from pymeasure.instruments.validators import strict_range
import logging
from time import sleep
# =============================================================================
# Logging
# =============================================================================
log = logging.getLogger(__name__)
log.addHandler(logging.NullHandler())
# =============================================================================
# Instrument file
# =============================================================================
class DSP7265(DSPBase):
"""Represents the Signal Recovery DSP 7265 lock-in amplifier.
Class inherits commands from the DSPBase parent class and utilizes dynamic
properties for various properties and includes additional functionality.
.. code-block:: python
lockin7265 = DSP7265("GPIB0::12::INSTR")
lockin7265.imode = "voltage mode" # Set to measure voltages
lockin7265.reference = "internal" # Use internal oscillator
lockin7265.fet = 1 # Use FET pre-amp
lockin7265.shield = 0 # Ground shields
lockin7265.coupling = 0 # AC input coupling
lockin7265.time_constant = 0.10 # Filter time set to 100 ms
lockin7265.sensitivity = 2E-3 # Sensitivity set to 2 mV
lockin7265.frequency = 100 # Set oscillator frequency to 100 Hz
lockin7265.voltage = 1 # Set oscillator amplitude to 1 V
lockin7265.gain = 20 # Set AC gain to 20 dB
print(lockin7265.x) # Measure X channel voltage
lockin7265.shutdown() # Instrument shutdown
"""
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Dynamic values - Override base class validator values
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
frequency_values = [0.001, 2.5e5]
harmonic_values = [1, 65535]
curve_buffer_bit_values = [1, 2097151]
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Constants
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CURVE_BITS = ['x', 'y', 'magnitude', 'phase', 'sensitivity', 'adc1',
'adc2', 'adc3', 'dac1', 'dac2', 'noise', 'ratio', 'log ratio',
'event', 'frequency part 1', 'frequency part 2',
# Dual modes
'x2', 'y2', 'magnitude2', 'phase2', 'sensitivity2']
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Initializer
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def __init__(self, adapter, name="Signal Recovery DSP 7265", **kwargs):
super().__init__(
adapter,
name,
**kwargs
)
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Additional properties
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dac3 = Instrument.control(
"DAC. 3", "DAC. 3 %g",
"""Control the voltage of the DAC3 output on the rear panel.
Valid values are floating point numbers between -12 to 12 V.
""",
validator=strict_range,
values=[-12, 12]
)
dac4 = Instrument.control(
"DAC. 4", "DAC. 4 %g",
"""Control the voltage of the DAC4 output on the rear panel.
Valid values are floating point numbers between -12 to 12 V.
""",
validator=strict_range,
values=[-12, 12]
)
@property
def adc3(self):
"""Measure the ADC3 input voltage."""
# 50,000 for 1V signal over 1 s
integral = self.values("ADC 3")[0]
return integral / (50000.0 * self.adc3_time)
@property
def adc3_time(self):
"""Control the ADC3 sample time in seconds."""
# Returns time in seconds
return self.values("ADC3TIME")[0] / 1000.0
@adc3_time.setter
def adc3_time(self, value):
# Takes time in seconds
self.write("ADC3TIME %g" % int(1000 * value))
sleep(value * 1.2)
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