NI RFmx SpecAn IQ Attributes

IQ Attributes

• RFMXSPECAN_ATTR_IQ_MEASUREMENT_ENABLED
• RFMXSPECAN_ATTR_IQ_SAMPLE_RATE
• RFMXSPECAN_ATTR_IQ_ACQUISITION_TIME
• RFMXSPECAN_ATTR_IQ_PRETRIGGER_TIME
• Bandwidth
  • RFMXSPECAN_ATTR_IQ_BANDWIDTH_AUTO
  • RFMXSPECAN_ATTR_IQ_BANDWIDTH
• RFMXSPECAN_ATTR_IQ_NUMBER_OF_RECORDS
• RFMXSPECAN_ATTR_IQ_DELETE_RECORD_ON_FETCH

RFMXSPECAN_ATTR_IQ_MEASUREMENT_ENABLED

Data Type:	int32
Access:	read/write
Functions:	RFmxSpecAn_SetAttributeI32 RFmxSpecAn_GetAttributeI32
Description:	Specifies whether to enable the I/Q measurement. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector Strings topic for information about the string syntax for named signals. The default value is RFMXSPECAN_VAL_FALSE. Get Function: RFmxSpecAn_IQGetMeasurementEnabled Set Function: RFmxSpecAn_IQSetMeasurementEnabled

RFMXSPECAN_ATTR_IQ_SAMPLE_RATE

Data Type:	float64
Access:	read/write
Functions:	RFmxSpecAn_SetAttributeF64 RFmxSpecAn_GetAttributeF64
Description:	Specifies the acquisition sample rate. This value is expressed in samples per second (S/s). You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector Strings topic for information about the string syntax for named signals. The default value is 50 MS/s. Get Function: RFmxSpecAn_IQGetSampleRate Set Function: RFmxSpecAn_IQSetSampleRate

RFMXSPECAN_ATTR_IQ_ACQUISITION_TIME

Data Type:	float64
Access:	read/write
Functions:	RFmxSpecAn_SetAttributeF64 RFmxSpecAn_GetAttributeF64
Description:	Specifies the acquisition time for the I/Q measurement. This value is expressed in seconds. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector Strings topic for information about the string syntax for named signals. The default value is 0.001. Get Function: RFmxSpecAn_IQGetAcquisitionTime Set Function: RFmxSpecAn_IQSetAcquisitionTime

RFMXSPECAN_ATTR_IQ_PRETRIGGER_TIME

Data Type:	float64
Access:	read/write
Functions:	RFmxSpecAn_SetAttributeF64 RFmxSpecAn_GetAttributeF64
Description:	Specifies the pretrigger time for the I/Q measurement. This value is expressed in seconds. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector Strings topic for information about the string syntax for named signals. The default value is 0. Get Function: RFmxSpecAn_IQGetPretriggerTime Set Function: RFmxSpecAn_IQSetPretriggerTime

IQ Bandwidth

RFMXSPECAN_ATTR_IQ_BANDWIDTH_AUTO

Data Type:	int32
Access:	read/write
Functions:	RFmxSpecAn_SetAttributeI32 RFmxSpecAn_GetAttributeI32
Description:	Specifies whether the measurement computes the minimum acquisition bandwidth. The default value is RFMXSPECAN_VAL_IQ_AUTO_BANDWIDTH_TRUE. Get Function: RFmxSpecAn_IQGetBandwidthAuto Set Function: RFmxSpecAn_IQSetBandwidthAuto
Values:

RFMXSPECAN_VAL_IQ_AUTO_BANDWIDTH_FALSE (0)	The measurement uses the value of the RFMXSPECAN_ATTR_IQ_BANDWIDTH attribute as the minimum acquisition bandwidth.
RFMXSPECAN_VAL_IQ_AUTO_BANDWIDTH_TRUE (1)	The measurement uses 0.8 * sample rate as the minimum signal bandwidth.

RFMXSPECAN_ATTR_IQ_BANDWIDTH

Data Type:	float64
Access:	read/write
Functions:	RFmxSpecAn_SetAttributeF64 RFmxSpecAn_GetAttributeF64
Description:	Specifies the minimum acquisition bandwidth when you set the RFMXSPECAN_ATTR_IQ_BANDWIDTH_AUTO attribute to RFMXSPECAN_VAL_IQ_AUTO_BANDWIDTH_FALSE. This value is expressed in Hz. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector Strings topic for information about the string syntax for named signals. The default value is 1 MHz. Get Function: RFmxSpecAn_IQGetBandwidth Set Function: RFmxSpecAn_IQSetBandwidth

RFMXSPECAN_ATTR_IQ_NUMBER_OF_RECORDS

Data Type:	int32
Access:	read/write
Functions:	RFmxSpecAn_SetAttributeI32 RFmxSpecAn_GetAttributeI32
Description:	Specifies the number of records to acquire. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector Strings topic for information about the string syntax for named signals. The default value is 1. Get Function: RFmxSpecAn_IQGetNumberOfRecords Set Function: RFmxSpecAn_IQSetNumberOfRecords

RFMXSPECAN_ATTR_IQ_DELETE_RECORD_ON_FETCH

Data Type:	int32
Access:	read/write
Functions:	RFmxSpecAn_SetAttributeI32 RFmxSpecAn_GetAttributeI32
Description:	Specifies whether the measurement deletes the fetched record. The default value is RFMXSPECAN_VAL_IQ_DELETE_RECORD_ON_FETCH_TRUE. Get Function: RFmxSpecAn_IQGetDeleteRecordOnFetch Set Function: RFmxSpecAn_IQSetDeleteRecordOnFetch
Values:

RFMXSPECAN_VAL_IQ_DELETE_RECORD_ON_FETCH_FALSE (0)	The measurement does not delete the fetched record.
RFMXSPECAN_VAL_IQ_DELETE_RECORD_ON_FETCH_TRUE (1)	The measurement deletes the fetched record.