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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 truncated_range
from io import StringIO
import numpy as np
import pandas as pd
class AgilentE4408B(SCPIUnknownMixin, Instrument):
""" Represents the AgilentE4408B Spectrum Analyzer
and provides a high-level interface for taking scans of
high-frequency spectrums
"""
def __init__(self, adapter, name="Agilent E4408B Spectrum Analyzer", **kwargs):
super().__init__(
adapter,
name,
**kwargs
)
start_frequency = Instrument.control(
":SENS:FREQ:STAR?;", ":SENS:FREQ:STAR %e Hz;",
""" A floating point property that represents the start frequency
in Hz. This property can be set.
"""
)
stop_frequency = Instrument.control(
":SENS:FREQ:STOP?;", ":SENS:FREQ:STOP %e Hz;",
""" A floating point property that represents the stop frequency
in Hz. This property can be set.
"""
)
frequency_points = Instrument.control(
":SENSe:SWEEp:POINts?;", ":SENSe:SWEEp:POINts %d;",
""" An integer property that represents the number of frequency
points in the sweep. This property can take values from 101 to 8192.
""",
validator=truncated_range,
values=[101, 8192],
cast=int
)
frequency_step = Instrument.control(
":SENS:FREQ:CENT:STEP:INCR?;", ":SENS:FREQ:CENT:STEP:INCR %g Hz;",
""" A floating point property that represents the frequency step
in Hz. This property can be set.
"""
)
center_frequency = Instrument.control(
":SENS:FREQ:CENT?;", ":SENS:FREQ:CENT %e Hz;",
""" A floating point property that represents the center frequency
in Hz. This property can be set.
"""
)
sweep_time = Instrument.control(
":SENS:SWE:TIME?;", ":SENS:SWE:TIME %.2e;",
""" A floating point property that represents the sweep time
in seconds. This property can be set.
"""
)
@property
def frequencies(self):
""" Returns a numpy array of frequencies in Hz that
correspond to the current settings of the instrument.
"""
return np.linspace(
self.start_frequency,
self.stop_frequency,
self.frequency_points,
dtype=np.float64
)
def trace(self, number=1):
""" Returns a numpy array of the data for a particular trace
based on the trace number (1, 2, or 3).
"""
self.write(":FORMat:TRACe:DATA ASCII;")
data = np.loadtxt(
StringIO(self.ask(":TRACE:DATA? TRACE%d;" % number)),
delimiter=',',
dtype=np.float64
)
return data
def trace_df(self, number=1):
""" Returns a pandas DataFrame containing the frequency
and peak data for a particular trace, based on the
trace number (1, 2, or 3).
"""
return pd.DataFrame({
'Frequency (GHz)': self.frequencies * 1e-9,
'Peak (dB)': self.trace(number)
})
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