For the PXI-5660 what value is the resolution bandwidth set to when the resolution bandwidth parameter in ConfigureSpectrumForRFSA in niSMT.cs is set to -1 .

[shuli]

I have existing test code using the function ConfigureSpectrumForRFSA in niSMT.cs. The resolution bandwidth is set to -1. In the comments section for this function it states "If you set the value to -1 or any number smaller than the minimum resolution bandwidth, the function automatically changes the value to the minimum resolution bandwidth." We are using the PXI-5660. Looking at the PXI-5660 Specification manual it lists the Resolution bandwidth as "fully adjustable (< 1 Hz to 10 MHz)". What value is the resolution bandwidth set to?

[Dan_K]

Hello shuli,

The frequency it is coerced to depends not only on the device, but also on the chosen center frequency and span. The best way to find out what the resolution bandwidth is coerced to would be to look at the Actual Spectrum Settings that are passed by reference into the function. After running this function this object will contain all of the adjusted values for center frequency, span, resolution bandwidth, window type, and number of spectral lines. The function evaluates your requested spectrum settings and adjusts them for consistency with one another and with the input sampling frequency.

[shuli]

Thanks Dan_K! I now have the information I need.