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Adjust VCXO Calibration (G Dataflow)

Last Modified: September 15, 2017

For SMC-based devices, this function calibrates the sample rate of the digitizer.

This function adjusts the frequency of the voltage controlled crystal oscillator (VCXO) that serves as the digitizer's onboard sample rate timebase. Check the calibration procedure of your device and set the value of frequency parameter. Before calling this function, connect an accurate, stable reference signal to channel 0 (the channel used is not configurable).

This function adjusts frequency calibration constants until the digitizer measures the frequency of the reference signal. The new calibration constants take effect immediately for the duration of the external calibration session. The constants are written to the EEPROM if you call End Calibration with no errors and with action set to Store Calibration.

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Note  

Use this function only when following the external calibration procedure for your device.

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session in

The instrument handle that you obtain from Start Calibration. The handle identifies a particular instrument session.

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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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stimulus frequency

The frequency of the external reference clock connected to channel 0.

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session out

Passes the instrument handle to the next node in the program. This parameter has the same value as session in.

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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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