#
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from pymeasure.instruments import Instrument
from pymeasure.instruments.validators import truncated_range, strict_discrete_set, strict_range


class AdvantestR3767CG(Instrument):
    """ Represents the Advantest R3767CG VNA. Implements controls to change the analysis
    	range and to retreve the data for the trace. 
    """

    id = Instrument.measurement(
    	"*IDN?", """ Reads the instrument identification """
    )

    center_frequency = Instrument.control(
    	":FREQ:CENT?", ":FREQ:CENT %d",
        """Center Frequency in Hz""",
        validator=strict_range,
        values=[300000, 8000000000]
    )

    span_frequency = Instrument.control(
    	":FREQ:SPAN?", ":FREQ:SPAN %d",
        """Span Frequency in Hz""",
        validator=strict_range,
        values=[1, 8000000000]
    )

    start_frequency = Instrument.control(
        ":FREQ:STAR?", ":FREQ:STAR %d", 
        """ Starting frequency in Hz """,
        validator=strict_range,
        values=[1, 8000000000]
    )

    stop_frequency  = Instrument.control(
        ":FREQ:STOP?",":FREQ:STOP %d", 
        """ Stoping frequency in Hz """,
        validator=strict_range,
        values=[1, 8000000000]
    )

    trace_1 = Instrument.measurement(
        "TRAC:DATA? FDAT1", """ Reads the Data array from trace 1 after formatting """
    )

    def __init__(self, resourceName, **kwargs):
        super(AdvantestR3767CG, self).__init__(
            resourceName,
            "Advantest R3767CG",
            **kwargs
        )

        # Tell unit to operate in IEEE488.2-1987 command mode.
        self.write("OLDC OFF")