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RESISTANCE_4W_USB4065

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Sets the measurement mode to four-wire resistance for a NI USB-4065 DMM. Four-wire resistance is more accurate than two-wire. Two-wire resistance can be measured with the RESISTANCE_USB4065 block. Also optionally reads the selected unit. You can also use the READ_USB4065 block to read the selected unit in a separate block. Requires a CONNECTION_USB4065 block to connect Flojoy to the instrument. The USB-4065 is a NI (National Instruments) multimeter. It is possible that the block will work with other NI DMMs (digital multimeters) such as the 4070 and 4080 series. This instrument will likely only be compatible with Windows systems due to NI driver availablity. To use the instrument you must install the runtime: https://www.ni.com/en/support/downloads/drivers/download.ni-dmm.html Params: NI_address : NIConnection The NI instrument. digits : select The number of digits for the measurement. Lower values are faster. resist_limit : select The maximum resistance to allow, in Ohms. read : bool Read the selected unit, or not. Returns: out : DataContainer Scalar: The resistance reading.
Python Code
from flojoy import flojoy, DataContainer, Scalar, NIConnection
from typing import Optional, Literal
import nidmm


@flojoy(inject_connection=True)
def RESISTANCE_4W_USB4065(
    connection: NIConnection,
    digits: Literal["4.5", "5.5", "6.5"] = "5.5",
    resist_limit: Literal[
        "1",
        "10",
        "100",
        "1000",
        "1e4",
        "1e5",
        "1e6",
    ] = "1e6",
    read: bool = False,
    default: Optional[DataContainer] = None,
) -> Scalar:
    """Sets the measurement mode to four-wire resistance for a NI USB-4065 DMM.

    Four-wire resistance is more accurate than two-wire. Two-wire resistance
    can be measured with the RESISTANCE_USB4065 block.

    Also optionally reads the selected unit. You can also use the READ_USB4065
    block to read the selected unit in a separate block.

    Requires a CONNECTION_USB4065 block to connect Flojoy to the instrument.

    The USB-4065 is a NI (National Instruments) multimeter. It is possible
    that the block will work with other NI DMMs (digital multimeters) such
    as the 4070 and 4080 series.

    This instrument will likely only be compatible with Windows systems due to
    NI driver availablity. To use the instrument you must install the runtime:

    https://www.ni.com/en/support/downloads/drivers/download.ni-dmm.html

    Parameters
    ----------
    NI_address: NIConnection
        The NI instrument.
    digits: select
        The number of digits for the measurement. Lower values are faster.
    resist_limit: select
        The maximum resistance to allow, in Ohms.
    read: bool
        Read the selected unit, or not.

    Returns
    -------
    DataContainer
        Scalar: The resistance reading.
    """

    session = connection.get_handle()

    session.configure_measurement_digits(
        nidmm.Function.FOUR_WIRE_RES,
        range=float(resist_limit),
        resolution_digits=float(digits),
    )

    if read:
        return Scalar(c=session.read())

    return None

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Example App

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React Flow mini map

In this example, a four wire resistance measurement is made with a NI USB-4065 digital multimeter.

Place the blocks:

  • CONNECTION USB4065
  • RESISTANCE 4W USB4065
  • READ USB4065
  • BIG NUMBER

First ensure the 4065 blocks have the correct instrument set in the parameters. Run the app to perform a reading.

Note the RESISTANCE 4W USB4065 block has an optional parameter to take a single reading. However, the READ USB4065 block can be used to make the same measurement multiple times without changing any settings.