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IviSpecAn Configure Frequency Center Span (G Dataflow)

Last Modified: October 24, 2017

Configures the frequency range of the spectrum analyzer using the center frequency and the frequency span. If span corresponds to zero Hertz, then the spectrum analyzer operates in time-domain mode. Otherwise, spectrum analyzer operates in frequency-domain mode. This node modifies the IviSpecAn>>Basic Operation>>Frequency Start and IviSpecAn>>Basic Operation>>Frequency Stop properties as follows: Frequency Start = Center Frequency - Span/2 Frequency Stop = Center Frequency + Span/2 Note: In auto-coupled mode, resolution bandwidth (RBW), video bandwidth (VBW), and sweep time may be affected by this node.

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instrument handle

The instrument handle that you obtain from the IviSpecAn Initialize Node or IviSpecAn Initialize With Options Node. 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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center frequency (5.0 MHz)

The center frequency of the frequency sweep. Units: Hertz Default Value: 5.0 MHz

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span (1.0 MHz)

The frequency span of the frequency sweep. Units: Hertz Default Value: 1.0 MHz

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instrument handle out

The instrument handle that you obtain from the IviSpecAn Initialize Node or IviSpecAn Initialize With Options 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.

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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