Table Of Contents

IviCounter Read (G Dataflow)

Last Modified: October 24, 2017

Initiates and fetches a measurement based on the preset configuration. Notes: You must configure measurement type and inputs before calling this node.

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instrument handle

The instrument handle that you obtain from IviACPwr Initialize or IviACPwr Initialize With Options. The handle identifies a particular instrument session.

Default: None

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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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maximum time

Pass the maximum length of time in which to allow the read operation to complete.

Express this value in milliseconds. If the operation does not complete within this time interval, the node returns the IVICOUNTER_ERROR_MAX_TIME_EXCEEDED (0xBFFA2003) error code. When this occurs, you can call IviCounter Abort to cancel the read operation and return the instrument to the Idle state.

Defined Values:

  • IVICOUNTER_VAL_MAX_TIME_INFINITE (-1) - Wait indefinitely for a timeout.
  • IVICOUNTER_VAL_MAX_TIME_IMMEDIATE (0) - Do not wait for a timeout.

Default Value: 5000 ms

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Note  

The Maximum Time parameter affects only this node. It has no effect on other timeout parameters or properties.

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instrument handle out

The instrument handle that you obtain from IviACPwr Initialize or IviACPwr Initialize With Options.

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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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measurement

Returns the measured value.

The units depend on the Measurement Function you select as shown below.

Measurement Function Units
Rise Time seconds
Fall Time seconds
Frequency hertz
Frequency Ratio units
PRF hertz
Period seconds
Phase degrees
Negative seconds
Width Positive seconds
Cycle Negative percent
Duty Cycle Positive percent
Time Interval seconds
Totalize occurrences

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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