NIRFSA_ATTR_DOWNCONVERTER_CENTER_FREQUENCY
- Updated2024-05-08
- 1 minute(s) read
NIRFSA_ATTR_DOWNCONVERTER_CENTER_FREQUENCY
Specific Attribute
| Data type |
Access | High Level Functions |
|---|---|---|
| ViReal64 | R/W | None |
Description
Enables in-band retuning and specifies the current frequency, in hertz (Hz), of the RF downconverter. If you set this attribute, any measurements outside the instantaneous bandwidth of the device are invalid. To disable in-band retuning, reset the attribute or call the niRFSA_ResetDevice function.
After you set this attribute, the downconverter is locked to that frequency until the value is changed or the attribute is reset. Locking the downconverter to a fixed value allows frequencies within the instantaneous bandwidth of the downconverter to be measured with minimal overhead, decreasing tuning time.
Valid Values: Any supported tuning frequency of the device
PXIe-5820: The only valid value for this attribute is 0 Hz.
Default Value:
PXIe-5694: The default value for the PXIe-5694 is 193.6 MHz unless you set the NIRFSA_ATTR_SIGNAL_CONDITIONING attribute to NIRFSA_VAL_SIGNAL_CONDITIONING_BYPASSED, in which case the default value is 187.5 MHz.
All other devices: The carrier frequency or spectrum center frequency. NI-RFSA sets this attribute to the default value based on the value of the NIRFSA_ATTR_ACQUISITION_TYPE attribute.
Supported Devices: PXIe-5601/5603/5605/5606 (external digitizer mode), PXIe-5644/5645/5646, PXIe-5663/5663E/5665/5667/5668, PXIe-5694, PXIe-5820/5830/5831/5832/5840/5841