DIGITIZED_TIME_DMM7510

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Measures digitized data vs time. Requires a CONNECT_DMM7510 block to create the connection. Params: connection : VisaConnection The VISA address (requires the CONNECTION_DMM7510 block). function : select, default=Digitize voltage Select the measurement function num_samples : int, default=100 The number of points/samples to measure. sample_rate : float, default=1000 The number of samples per second. range : float, default=1 The range of the function measurement. Returns: out : OrderedPair x: time y: measurements

Python Code

from typing import Optional, Literal
from flojoy import VisaConnection, flojoy, DataContainer, OrderedPair


@flojoy(inject_connection=True)
def DIGITIZED_TIME_DMM7510(
    connection: VisaConnection,
    input: Optional[DataContainer] = None,
    function: Literal[
        "Digitize voltage",
        "Digitize current",
    ] = "Digitize voltage",
    num_samples: int = 100,
    sample_rate: float = 1e3,
    range: float = 1,
) -> OrderedPair:
    """Measures digitized data vs time.

    Requires a CONNECT_DMM7510 block to create the connection.

    Parameters
    ----------
    connection : VisaConnection
        The VISA address (requires the CONNECTION_DMM7510 block).
    function : select, default=Digitize voltage
        Select the measurement function
    num_samples : int, default=100
        The number of points/samples to measure.
    sample_rate : float, default=1000
        The number of samples per second.
    range : float, default=1
        The range of the function measurement.

    Returns
    -------
    OrderedPair
        x: time
        y: measurements
    """

    dmm = connection.get_handle()

    if function == "Digitize voltage":
        dmm.write("dmm.digitize.func = dmm.FUNC_DIGITIZE_VOLTAGE")
    else:
        dmm.write("dmm.digitize.func = dmm.FUNC_DIGITIZE_CURRENT")

    dmm.write(f"dmm.digitize.range = {range}")
    dmm.write(f"dmm.digitize.samplerate = {sample_rate}")
    dmm.write(f"dmm.digitize.count = {num_samples}")

    dmm.write("dmm.digitize.aperture = dmm.APERTURE_AUTO")
    dmm.commands.dmm.digitize.inputimpedance = "dmm.IMPEDANCE_AUTO"

    dmm.commands.buffer_var["defbuffer1"].capacity = num_samples
    dmm.write("defbuffer1.clear()")
    dmm.write("dmm.digitize.read()")

    time = []
    y = []
    for cnt in range(1, num_samples + 1):
        y.append(float(dmm.commands.buffer_var["defbuffer1"].readings[cnt]))
        time.append(
            float(dmm.commands.buffer_var["defbuffer1"].relativetimestamps[cnt])
        )

    return OrderedPair(x=time, y=y)

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Example App

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In this example, a DC voltage measurement was extracted from a Keithley DMM7510.

First the necessary blocks were added:

• CONNECT_DMM7510
• RESET_DMM7510
• FUNCTION_DMM7510
• DIGITS_DMM7510
• MEASUREMENT_PARAMS_DMM7510
• MEASUREMENT_FILTER_DMM7510
• READ_DMM7510
• BIG_NUMBER

The instrument address was set for each DMM7510 block. The FUNCTION_DMM7510 block was changed in order to extract the correct measurement. The parameters in DIGITS_DMM7510, MEASUREMENT_PARAMS_DMM7510, and MEASUREMENT_FILTER_DMM7510 blocks were changed as necessary. The READ_DMM7510 block was connected to the BIG_NUMBER block in order to view the reading.

The blocks were connected as shown and the app was run.