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IviDmm Fetch (G Dataflow)

Version:
    Last Modified: October 24, 2017

    Returns the value from a previously initiated measurement. You must first call the IviDmm Initiate Node to initiate a measurement before calling this node. Notes: (1) After this node executes, the Reading parameter contains an actual reading or a value indicating that an over-range condition occurred. (2) If an over-range condition occurs, the Reading parameter contains an IEEE defined NaN (Not a Number) value and the node returns the IVIDMM_WARN_OVER_RANGE (0x3FFA2001) warning code. (3) You can test the measurement value for an over-range conditiion by calling the IviDmm Is Over-Range Node. (4) The class driver returns a simulated measurement when this node is called and the IviDmm>>Inherent IVI Settings>>User Options>>Simulate property is set to TRUE and the IviDmm>>Inherent IVI Settings>>User Options>>Use Specific Simulation property is set to FALSE. For information on how to configure a simulated measurement, refer to the online help manual. (5) This node does not check the instrument status. Typically, you call this node only in a sequence of calls to other low-level driver nodes. The sequence performs one operation. You use the low-level nodes to optimize one or more aspects of interaction with the instrument. If you want to check the instrument status, call the IviDmm Error-Query Node at the conclusion of the sequence.

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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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    instrument handle

    The instrument handle that you obtain from the IviDmm Initialize Node. The handle identifies a particular instrument session.

    Default: None

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    maximum time (5000 ms)

    Pass the maximum length of time in which to allow the multi-point read operation to complete. Express this value in milliseconds. If the operation does not complete within this time interval, the VI returns the IVIDMM_ERROR_MAX_TIME_EXCEEDED (0xBFFA2003) error code. When this occurs, you can call the IviDmm Abort VI to cancel the multi-point read operation and return the instrument to the Idle state. Defined Values: IVIDMM_VAL_MAX_TIME_INFINITE (-1) - Wait indefinitely for a timeout. IVIDMM_VAL_MAX_TIME_IMMEDIATE (0) - Do not wait for a timeout. Default Value: 5000 (ms) Notes: (1) The Maximum Time parameter affects only this VI. It has no effect on other timeout parameters or properties.

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    instrument handle out

    The instrument handle that you obtain from the IviDmm Initialize Node. The handle identifies a particular instrument session.

    Default: None

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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.
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    reading

    Returns the measured value. The value you specify for the Measurement Function parameter of the IviDmm Configure Measurement VI determines the units of this parameter as shown in the following table. DC Volts - volts AC Volts - volts DC Current - amperes AC Current - amperes 2-Wire Resistance - ohms 4-Wire Resistance - ohms AC plus DC Volts - volts AC plus DC Current - amperes Temperature - celcius Frequency - hertz Period - seconds Notes: (1) If an over-range condition occurs, the Reading parameter contains an IEEE defined NaN (Not a Number) value and the VI returns the IVIDMM_WARN_OVER_RANGE (0x3FFA2001) warning code. (2) You can test the measurement value for an over-range condirion by calling the IviDmm Is Over-Range VI.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: Not supported

    Web Server: Not supported in VIs that run in a web application


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