Specifies the scaling factor applied to the time-domain voltage data in the IF digitizer. Use this property 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 property 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 property value before further onboard processing. Set this property 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 property.

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

Remarks

The following table lists the characteristics of this property.

Short Name OSP Data Scaling Factor
Data type cdbl.png
Permissions Read/Write
High-level VIs N/A
Channel-based No
Resettable Yes