Table Of Contents

IviSpecAn Configure Level (G Dataflow)

Last Modified: October 24, 2017

Configures the vertical settings of the spectrum analyzer. This corresponds to settings like amplitude units, input attenuation, input impedance, reference level, and reference level offset.

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attenuation auto (False)

Specifies whether the spectrum analyzer is enabled for auto attenuation. When you set this value to TRUE, the attenuation is automatically selected. When you set this value to FALSE, the attenuation is set to manual selection. The driver uses this value to set the IviSpecAn>>Basic Operation>>Attenuation_AUTO property. Valid Values: TRUE - Attenuation is automatically selected FALSE - Attenuation is manually selected Default Value: FALSE

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reference level (0.0)

The calibrated vertical position of the captured data used as a reference for amplitude measurements. This is typically set to a value slightly higher than the highest expected signal level. The driver uses this value to set the IviSpecAn>>Basic Operation>>Reference Level property. Units: The units are determined by setting the Amplitude Units parameter of this VI or by setting IviSpecAn>>Basic Operation>>Amplitude Units property. Default Value: 0.0

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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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amplitude units (dBm)

Pass the units you want the spectrum analyzer to use for input, output, and display. The driver sets the IviSpecAn>>Basic Operation>>Amplitude Units to this value. Valid Values: - IVISPECAN_VAL_AMPLITUDE_UNITS_DBM - Sets the spectrum analyzer to measure in decibels relative to 1 milliwatt. - IVISPECAN_VAL_AMPLITUDE_UNITS_DBMV - Sets the spectrum analyzer to measure in decibels relative to 1 millivolt. - IVISPECAN_VAL_AMPLITUDE_UNITS_DBUV - Sets the spectrum analyzer to measure in decibels relative to 1 microvolt. - IVISPECAN_VAL_AMPLITUDE_UNITS_VOLT - Sets the spectrum analyzer to measure in volts. - IVISPECAN_VAL_AMPLITUDE_UNITS_WATT - Sets the spectrum analyzer to measure in watts. Default value: IVISPECAN_VAL_AMPLITUDE_UNITS_VOLT

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input impedance (50 ohms)

Specifies the value of input impedance, in ohms, expected at the active input port. This is typically 50 ohms or 75 ohms. The driver uses this value to set the IviSpecAn>>Basic Operation>>Input Impedance property. Units: Ohms Default Value: 50 ohms

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reference level offset (0.0)

Specifies the offset value to the reference level. This adjusts the reference level for external signal gain or loss. A positive value corresponds to a gain while a negative number corresponds to a loss. The driver uses this value to set the IviSpecAn>>Basic Operation>>Reference Level_OFFSET property. Units: dB Default Value: 0.0

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attenuation (0.0)

Specifies the input attenuation (in positive dB). This means that if 10dB is selected, the result is a reduction in the signal level of 10 dB. The driver uses this value to set the IviSpecAn>>Basic Operation>>Attenuation property. Units: dB Default Value: 0.0 Note: If auto attenuation is turned on, this value is ignored.

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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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