Table Of Contents

Initialize External Calibration (G Dataflow)

Version:
    Last Modified: March 3, 2017

    Creates a new session for external calibration to a specified DMM.

    Refer to the calibration procedure for your device before running this node.

    This node resets the DMM and prepares the EEPROM for new calibration coefficients.

    This node creates a new session the first time you call it for a DMM. If you run this node a second time on the same DMM, an error is returned. Use Close External Calibration to close a session obtained using this node.

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    resource name

    Resource name of the device to initialize. The resource name is assigned in NI MAX.

    Examples

    The following examples are valid syntax for this parameter:

    • NI-DAQmx name
    • DAQ::NI-DAQmx name[::INSTR]
    • DAQ::Traditional NI-DAQ device number[::INSTR]
    • IVI logical name
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    Caution  

    All IVI names for the resource name, such as logical names or virtual names, are case-sensitive. If you use logical names, driver session names, or virtual names in your program, you must make sure that the name you use matches the name in the IVI Configuration Store file exactly, without any variations in the case of the characters in the name.

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    calibration password

    Password required to enable external calibration functionality.

    The factory default password is "NI".

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    error in

    Error conditions that occur before this node runs.

    The node responds to this input according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Default: No error

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    session out

    Instrument identifier for subsequent NI-DMM nodes.

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    error out

    Error information.

    The node produces this output according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Measuring With an Open Calibration Session

    After opening a calibration session, the DMM cannot take valid measurements using this session until the DMM has been properly adjusted. Once the adjustment phase is complete, you can use this session to verify the new calibration constants. After verification, you have the option of saving the new calibration constants or reverting to the previous calibration constants by specifying the Action parameter in Close External Cal.

    If you encounter a fatal error such as a power failure or system crash while performing an external calibration, you can run Restore Last External Cal Constants to return the device to a usable state.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: Not supported


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