RFmxTdscdmaMXModAccResults.FetchCompositeEvm Method

public int FetchCompositeEvm(
	string selectorString,
	double timeout,
	out double rmsCompositeEvm,
	out double peakCompositeEvm,
	out double compositeRho,
	out double frequencyError,
	out double chipRateError,
	out double rmsCompositeMagnitudeError,
	out double rmsCompositePhaseError
)

Public Function FetchCompositeEvm ( 
	selectorString As String,
	timeout As Double,
	<OutAttribute> ByRef rmsCompositeEvm As Double,
	<OutAttribute> ByRef peakCompositeEvm As Double,
	<OutAttribute> ByRef compositeRho As Double,
	<OutAttribute> ByRef frequencyError As Double,
	<OutAttribute> ByRef chipRateError As Double,
	<OutAttribute> ByRef rmsCompositeMagnitudeError As Double,
	<OutAttribute> ByRef rmsCompositePhaseError As Double
) As Integer

Parameters

selectorString

Type: SystemString
Specifies a selector string comprising of the result name. If you do not specify the result name, the default result instance is used.

timeout

Type: SystemDouble
Specifies the timeout for fetching the specified measurement. This value is expressed in seconds. Set this value to an appropriate time, longer than expected for fetching the measurement. A value of -1 specifies that the method waits until the measurement is complete.

rmsCompositeEvm

Type: SystemDouble
Upon return, contains the value of the time-slot based RMS of the composite EVM, averaged over all active time slots and all averaging iterations. This value is expressed as a percentage. Values close to 0 indicate a good modulation accuracy. In a loopback setup, values of approximately 0.2 to 0.4 are typical.

peakCompositeEvm

Type: SystemDouble
Upon return, contains the value of the slot based peak composite EVM among all active time slots and averaging iterations. This value is expressed as a percentage.

compositeRho

Type: SystemDouble
Upon return, contains the time-slot based composite value of rho, averaged over all active time-slots and all averaging iterations. A value of 1 indicates a perfectly modulated signal. Typical values for real signals in a loopback setup are slightly below 1.000000.

frequencyError

Type: SystemDouble
Upon return, contains the frequency error averaged over all measured slots. This value is expressed in Hz.

chipRateError

Type: SystemDouble
Upon return, contains the chip rate error. This value is expressed in ppm.

rmsCompositeMagnitudeError

Type: SystemDouble
Upon return, contains the value of the time-slot based RMS of the composite magnitude error averaged over all active time slots and averaging iterations. This value is expressed as a percentage.

rmsCompositePhaseError

Type: SystemDouble
Upon return, contains the time-slot based RMS of the composite phase error, averaged over all active time slots and averaging iterations. This value is expressed in degrees.

Return Value

Reference