NIRFSA_ATTR_OSP_DATA_SCALING_FACTOR
- Updated2025-02-03
- 1 minute(s) read
NIRFSA_ATTR_OSP_DATA_SCALING_FACTOR
Specific Attribute
| Data type |
Access | High Level Functions |
|---|---|---|
| ViReal64 | R/W | None |
Description
Specifies the scaling factor applied to the time-domain voltage data in the IF digitizer. Use this attribute to maximize the dynamic range of the digitizer by increasing the maximum IF power the digitizer can measure without creating OSP overflows.
Because of the device amplitude response, some wide-band signals normally attenuated by the downconverter go through the IF digitizer without causing an ADC overflow. During IF equalization, these wide-band digitizer input signals may become amplified. These amplified input signal values overflow the available numeric range used in the signal processing algorithm.
You can use this attribute when OSP calculations would generate an overflow while applying digital filters to the data. The OSP module in the digitizer multiplies the time-domain signal amplitude, in volts, by the specified attribute value before further onboard processing. Set this attribute to a value less than 1 to avoid OSP overflow for near full-scale IF signals and to use the maximum dynamic range of the digitizer. NI-RFSA compensates for the specified OSP data scaling factor to ensure that the correct scaled data, in absolute levels, is always returned regardless of the value of this attribute.
Valid Values: 0.25 to 1.0
Default Values:
PXI-5661, PXIe-5663/5663E/5665 (3.6 GHz)/5667 (3.6 GHz)/5668, PXIe-5820/5830/5831/5832/5840/5841/5842/5860—1.0
PXIe-5665 (14 GHz)/5667 (7 GHz)—0.8
Supported Devices: PXI-5661, PXIe-5663/5663E/5665/5667/5668, PXIe-5820/5830/5831/5832/5840/5841/5842/5860