Table Of Contents

IviSpecAn Configure Signal Track Enabled [MKR] (G Dataflow)

Last Modified: October 24, 2017

Enables signal-tracking. When signal tracking is turned on, the spectrum analyzer centers the signal on which the active marker resides after each sweep.

There are two prevalent methods of signal tracking in the industry.

1. A search for the largest signal on screen is made, and the spectrum analyzer center frequency is tuned to this signal.

2. The marker is placed on a signal (anywhere on screen) and when marker track is enabled, the frequency of the peak of the selected signal is used for tuning the spectrum analyzer. This does not need to be the largest signal on screen, and this method tracks the specified signal in the presence of a larger signal.

This node implements the first method of signal tracking. This INVALIDATES the IviSpecAn>>Basic Operation>>Frequency Start and IviSpecAn>>Basic Operation>>Frequency Stop property values.

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Note  

Signal track can only be enabled on one marker at a time. The driver shall check all other markers to see if this node is already enabled on any marker other than the active and turn this off on the other marker before enabling this on the active marker.

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signal track enabled (False)

Specifies whether signal tracking is enabled. The driver uses this value to set the IviSpecAn>>Markers>>Signal Track Enabled property. Valid Values: TRUE; FALSE Default Value: FALSE

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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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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 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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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

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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